JPH11244890A - Biological water treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to well remove the phosphorus component in sewage by disposing a means for detecting the amt. of the phosphorus flowing into a biological reaction vessel in an apparatus provided with a means for adding a chemical into the biological reaction vessel into which the sewage flows and adjusting the amt. of the chemical to be added according to a difference between the measured value and a target value. SOLUTION: The sewage is introduced via piping a into the biological reaction vessel 1 where the sewage is mixed and agitated with activated sludge under the supply of air from an aerator 4 and the pollutant in the sewage is biologically oxidation decomposed. The liquid mixture composed of the sewage and the activated sludge is next sent to a settling basin 5 where the activated sludge is settled and separated and the supernatant water is released from a piping (c). Part of the activated sludge is returned via piping (f) to an aeration tank 2. At this time, the amt. of the phosphorus to be added per unit time is computed by an arithmetic and logic unit 12 from the measured values of a flow meter 10 and a phosphorus concn. meter 11. An injection pump 9 is controlled by a deviation between this computed value and the set value by a setter 13, by which the addition amt. of a flocculating agent which is the chemical in a storage tank 8 is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drug adding device for adding a drug to a biological water treatment device.

[0002]

2. Description of the Related Art When phosphorus contained in sewage continues to flow into lakes and marshes and strongly closed bays, the concentration eventually becomes excessive,
Harmful phytoplankton such as blue-green algae and red tide are generated. This is called the eutrophication phenomenon and has become a serious social problem in recent years. As described in "Water Treatment Engineering (edited by Tetsuo Ide, Technical Hall)", there is an activated sludge method as a general method for treating municipal sewage and organic wastewater.
Activated sludge method is a group of microorganisms that have a purification function (activated sludge).
Is stored in a biological reactor, and aerated while sufficiently mixing and contacting the wastewater with the sewage to oxidatively decompose organic substances, which are the main polluting components in the sewage. The mixed solution after the aeration treatment is separated into supernatant water and activated sludge in the sedimentation basin, the supernatant water is discharged outside the system, and the concentrated activated sludge is returned to the biological reaction tank again.

[0003] The activated sludge method is a treatment method whose main purpose is to biologically oxidatively decompose organic matter, and phosphorus cannot be sufficiently removed by itself. Therefore,
As described in the "Advanced Treatment Facility Design Manual (draft) (Japan Sewage Works Association, 1994)", a modified activated sludge method utilizing the functions of chemical reactions and certain microorganisms has been developed. .

For example, in the anaerobic-aerobic activated sludge method, when phosphorus-accumulating bacteria in activated sludge are put in a state free of oxidizing substances such as oxygen and nitrate nitrogen, that is, in a so-called anaerobic state, the sludge is converted from the body into a liquid phase. Discharges phosphoric acid phosphorus, conversely in a state with oxygen,
This is a biological phosphorus removal method that utilizes the ingestion of more phosphoric acid phosphorus into the body than is released into the liquid phase when placed in a so-called aerobic state. That is, the biological reaction tank in the activated sludge method is composed of two tanks, an anaerobic tank and an aerobic tank. In the anaerobic tank, discharge of phosphorus from phosphorus accumulating bacteria is performed, and in the aerobic tank, excessive intake of phosphorus is performed. This reduces phosphorus in sewage.

In general, it is known that the larger the amount of phosphorus discharged in an anaerobic state, the larger the intake amount in an aerobic state. Phosphorus removal by the anaerobic and aerobic activated sludge process is susceptible to external factors because it utilizes biological phenomena. A typical example is rainfall. When rainwater containing oxygen and nitrate nitrogen flows in and the required anaerobic state cannot be maintained, the phosphorus removal rate decreases. To maintain good water quality, some means is needed to complement biological phosphorus removal.

The most common complement to biological phosphorus removal is the addition of a flocculant. The flocculant addition method is a phosphorus removal method based on a chemical reaction, and utilizes the fact that a trivalent metal ion reacts with a phosphate ion in sewage to form a poorly water-soluble substance. That is, an aluminum salt or iron (3) salt capable of forming a precipitate near neutrality is added to the biological reaction tank as a flocculant, and the floc in which the phosphorus precipitate and the biological floc are completely integrated is precipitated in the precipitation tank. By separating, phosphorus in sewage is removed. The method of adding a flocculant removes phosphorus based on a chemical reaction, and thus has an advantage that an effect can be surely obtained.

There is also a method of adding acetic acid to an anaerobic tank. This is intended to activate biological phosphorus removal by replenishing fatty acid-based organic substances required for phosphorus discharge in an anaerobic tank. In such a supplemental method for biological phosphorus removal, it is necessary to introduce a sufficient amount of a drug necessary for phosphorus removal. Conventionally, there has been the following coagulant adding apparatus to meet such a demand. FIG.
9 is described in JP-A-63-242392,
It is a block diagram which shows the apparatus which adjusts the coagulant addition amount to the biological water treatment apparatus by an activated sludge method.

First, the configuration and operation of a biological water treatment apparatus using the activated sludge method will be described. In FIG. 29, a is a pipe through which sewage flows, and is connected to the biological reaction tank 51. Reference numeral 52 denotes an aeration device for supplying air to the biological reaction tank 51, and reference numeral 53 denotes a sedimentation pond for precipitating a mixed solution containing microorganisms, and is connected to the biological reaction tank 51 via a pipe b. Reference numeral c denotes a pipe for discharging the supernatant water after the settling treatment, and is connected to the settling basin 53. Reference numeral 54 denotes a pump for discharging surplus microorganisms out of the system, and is connected to the sedimentation basin 53 via a pipe d. The pipe e is a pipe connected to the pump 54. 55
Is a pump for returning the microorganisms to the biological reaction tank 51, and is connected to the sedimentation tank 53 via the pipe d and to the biological reaction tank 51 via the pipe f.

The sewage is introduced into the biological reaction tank 51 through the pipe a. In the biological reaction tank 51, pollutants in the sewage are biologically oxidatively decomposed by mixing and stirring the air supplied from the aeration device 52 with the sewage and the activated sludge.
The mixed liquid of the sewage and the activated sludge is transferred to the sedimentation basin 53
Sent to In the sedimentation tank 53, after the activated sludge is settled and separated, the supernatant water is discharged through the pipe c. Part of the activated sludge is drawn out of the system via the pump 54 and the pipe e, and the other excess sludge is returned to the biological reaction tank 51 via the pump 55 and the pipe f.

Next, the configuration and operation of the coagulant adding device will be described. In FIG. 29, reference numeral 56 denotes a flocculant storage tank, and 57, an injection pump.
6 is connected. h is a pipe for guiding the flocculant to the biological reaction tank 51, and is connected to the injection pump 57. 58
Is a phosphorus concentration meter, and 59 is a coagulant injection amount control device, which is connected to the phosphorus concentration meter 58 via a signal line 58a and the injection pump 57 via a signal line 59a.

The phosphorus concentration P0 in the sedimentation basin 53 at a certain time and the phosphorus concentration P1 after a certain time t1 are measured by a phosphorus concentration meter 58, respectively, and transmitted to a coagulant injection amount control device 59 via a signal line 58a. . In the coagulant injection amount control device 59, the phosphorus concentration change rate A = (P1-P0)
/ T1 and the phosphorus concentration Pc after a certain time t2
Is estimated as, for example, Pc = P1 + A × t2. A coagulant amount is calculated that matches the difference Pc-S between the calculated value Pc and the target value S of the treated phosphorus concentration. The amount of the flocculant is indicated by signal line 59.
a to the coagulant injection pump 57 via the
7 injects a predetermined amount of a flocculant into the biological reaction tank 51 via a pipe h.

[0012]

Since the conventional coagulant adding apparatus is constructed as described above, the coagulant addition amount is determined based on the phosphorus concentration in the treated water. However, the flow rate of general sewage, mainly domestic wastewater, fluctuates significantly. If the amount of coagulant is determined using only the value of the phosphorus concentration with the treated water amount assumed constant, the coagulant amount is insufficient when the actual water amount is large, and conversely when the water amount is small. However, there is a problem that the amount becomes excessive.

Further, in a conventional flocculant adding apparatus,
The purpose was to keep the concentration of phosphorus in the treated water constant. However, if the flow rate is significantly increased due to rainfall, etc., even if the phosphorus concentration of the treated water is maintained at the value at the time of normal flow, the absolute amount of phosphorus flowing out to rivers etc. will increase, resulting in damage to the environment. Cannot be prevented.

When the coagulant adding apparatus is applied to a biological phosphorus removing apparatus such as an anaerobic aerobic activated sludge method, the state of biological phosphorus removal is detected promptly and the amount of the coagulant added is determined accordingly. Must. In the conventional coagulant addition apparatus, since the coagulant addition amount is determined based on the phosphorus concentration of the treated water, there is a problem that the response is delayed. Further, regarding the addition of acetic acid, there are still few examples applied to actual sewage treatment facilities, and, of course, the control of the amount of addition has not been performed at all.

The present invention has been made in order to solve the above-mentioned problems, and by appropriately controlling the amount of a coagulant or acetic acid to be added to a biological water treatment apparatus, the amount of phosphorus in sewage can be reduced. It is an object of the present invention to obtain a drug addition value to a biological water treatment apparatus that can always remove components well and ensure good water quality.

[0016]

A biological water treatment apparatus according to a first aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical. Means for detecting the amount of phosphorus flowing into the biological reaction tank, means for setting a target value of the amount of phosphorus flowing out of the biological reaction tank, and the amount of drug added in accordance with the difference between the amount of phosphorus flowing in and the target value. And means for adjusting.

According to a second aspect of the present invention, there is provided a biological water treatment apparatus for estimating an amount of phosphorus flowing into a chemical adding position and setting a target value of the amount of phosphorus flowing out of the biological reaction tank. And means for adjusting the amount of drug added in accordance with the difference between the amount of inflowing phosphorus and the target value.

According to a third aspect of the present invention, there is provided a biological water treatment apparatus having a mixing pond in a subsequent step of a biological reaction tank into which sewage flows, and a means for adding a chemical. Means for detecting the amount of phosphorus flowing into the mixing pond, means for setting a target value of the amount of phosphorus flowing out of the biological reaction tank, and addition of a drug according to the difference between the amount of phosphorus flowing in and the target value. Means for adjusting the amount.

A biological water treatment apparatus according to a fourth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein Means for detecting the amount of phosphorus flowing out, means for setting a target value of the amount of phosphorus flowing out from the biological reaction tank, and means for adjusting the amount of drug added in accordance with the difference between the amount of phosphorus flowing out and the target value It is provided.

A biological water treatment apparatus according to a fifth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein the biological reaction tank is Means for detecting the amount of phosphorus flowing in; means for detecting the amount of phosphorus flowing out of the biological reaction tank; means for setting a target value of the amount of phosphorus flowing out of the biological reaction tank; And a means for adjusting the amount of drug added in accordance with the difference between the amount of phosphorus discharged and the target value.

A biological water treatment apparatus according to a sixth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and means for adding a chemical, wherein the amount of inflow sewage is reduced. A means for measuring, a means for measuring the phosphorus concentration in the biological reaction tank, and a means for determining an injection rate from the phosphorus concentration and adjusting the amount of the drug added based on the injection rate and the amount of inflowing sewage are provided.

A biological water treatment apparatus according to a seventh aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein the amount of inflowing sewage is reduced. A means for measuring, a means for measuring the phosphorus content in the phosphorus accumulating bacteria in the biological reaction tank, and a means for determining the injection rate from the phosphorus content and adjusting the amount of the drug added based on the injection rate and the amount of inflowing sewage are provided. It is a thing.

The biological water treatment apparatus according to claim 8 of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein the amount of sewage flowing in is reduced. There are provided means for measuring, means for measuring the oxidation-reduction potential in the biological reaction tank, and means for obtaining the injection rate from the oxidation-reduction potential, and for adjusting the amount of the drug added according to the injection rate and the amount of inflowing sewage.

A biological water treatment apparatus according to a ninth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein the amount of inflowing sewage is reduced. Means for measuring, means for detecting the concentration of phosphorus in the incoming sewage, means for measuring the concentration of phosphorus in the biological reaction tank, and determining the injection rate from the difference between the concentration of phosphorus in the incoming sewage and the concentration of phosphorus in the biological reaction tank. Means for adjusting the amount of drug added in accordance with the injection rate and the amount of inflowing sewage.

A biological water treatment apparatus according to a tenth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein the amount of inflowing sewage is reduced. Means for measuring, means for measuring the phosphorus concentration in the anaerobic tank of the biological reaction tank, means for measuring the phosphorus concentration in the aerobic tank, and the difference between the phosphorus concentration in the anaerobic tank and the phosphorus concentration in the aerobic tank. Means for determining the injection rate and adjusting the amount of the drug added based on the injection rate and the amount of inflowing sewage are provided.

A biological water treatment apparatus according to claim 11 of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein the amount of inflowing sewage is reduced. A means for measuring, a means for measuring the concentration of microorganisms in the biological reaction tank, and a means for obtaining an injection rate from the concentration of microorganisms, and for adjusting the amount of drug added based on the injection rate and the amount of inflowing sewage are provided.

A biological water treatment apparatus according to a twelfth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein the amount of inflowing sewage is reduced. Calculate the injection rate from the measuring means and the inflow sewage volume,
Means are provided for adjusting the amount of drug added in accordance with the injection rate and the amount of inflowing sewage.

A biological water treatment apparatus according to a thirteenth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein the amount of inflowing sewage is reduced. There are provided means for measuring, means for measuring the concentration of dissolved oxygen in the influent sewage, and means for finding the injection rate from the concentration of dissolved oxygen, and for adjusting the amount of the drug added in accordance with the injection rate and the amount of influent sewage.

A biological water treatment apparatus according to a fourteenth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein the amount of inflowing sewage is reduced. There are provided means for measuring, means for measuring the oxidation-reduction potential in the inflowing sewage, and means for obtaining the injection rate from the oxidation-reduction potential, and adjusting the amount of the drug added according to the injection rate and the amount of the inflowing sewage.

A biological water treatment apparatus according to a fifteenth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows and an aeration device is attached, and a means for adding a chemical. Means for measuring the amount of inflow sewage,
Means are provided for obtaining an injection rate from the amount of aeration by the aeration device, and adjusting the amount of the drug to be added based on the injection rate and the amount of inflowing sewage.

A biological water treatment apparatus according to a sixteenth aspect of the present invention is a biological water treatment tank into which sewage flows, a means for adding a chemical, and a sedimentation treatment for sedimenting a mixed solution flowing out of the biological reaction tank. A biological water treatment apparatus having a pond and a means for returning the settled sludge to the biological reaction tank, wherein a means for measuring the amount of inflow sewage and an injection rate are determined from the amount of sludge returned by the sludge return means. A means is provided for adjusting the amount of drug added in accordance with the injection rate and the amount of inflow sewage.

A biological water treatment apparatus according to a seventeenth aspect of the present invention provides a biological reaction tank into which sewage flows, a means for adding a chemical, and a sedimentation treatment for sedimenting a mixed solution flowing out of the biological reaction tank. A biological water treatment apparatus having a pond and a means for extracting precipitated excess sludge, wherein an injection rate is determined based on a means for measuring an inflow sewage amount and an excess sludge withdrawal amount extracted by the excess sludge withdrawal means. And means for adjusting the amount of drug added based on the injection rate and the inflow / sewage amount.

The biological water treatment apparatus according to claim 18 of the present invention comprises a biological reaction tank into which sewage flows, a means for adding a chemical, an aeration device attached to the biological reaction tank, and a biological reaction tank. A biological water treatment apparatus having a sedimentation basin for performing sedimentation treatment on an outflowing mixture, a means for returning the settled sludge to the biological reaction tank, and a means for withdrawing the settled excess sludge; The injection rate is determined from at least one of the following: a means for measuring the amount of sewage, an amount of aeration by the aeration device, an amount of sludge returned by the sludge return means, and an amount of excess sludge withdrawn by the excess sludge withdrawing means. And means for adjusting the amount of drug added by the amount of inflow sewage.

A biological water treatment apparatus according to a nineteenth aspect of the present invention is a biological water treatment means having a biological reaction tank into which sewage flows and an aeration device is attached, and a means for adding a chemical. An aeration amount and an oxidation-reduction potential treatment device, wherein a means for measuring an inflow sewage amount, and any one of an oxidation-reduction potential, a phosphorus concentration, and a phosphorus content in a phosphorus accumulating bacterium in a biological reaction tank. Means for measuring, and means for obtaining an injection rate from one of the oxidation-reduction potential, phosphorus concentration, and phosphorus content and the amount of aeration by the aeration device, and adjusting the amount of the drug added based on the injection rate and the amount of inflowing sewage. It is provided.

According to a twentieth aspect of the present invention, there is provided a biological water treatment apparatus, wherein a biological reaction tank into which sewage flows, a means for adding a chemical, and a sedimentation treatment for sedimenting a mixed solution flowing out of the biological reaction tank. A biological water treatment apparatus having a pond and a means for returning settled sludge to a biological reaction tank, wherein a means for measuring an inflow sewage amount, an oxidation-reduction potential, a phosphorus concentration, and a phosphorus accumulation bacterium in the biological reaction tank. Means for measuring any one of the phosphorus contents in the red, redox potential, phosphorus concentration,
Means are provided for obtaining an injection rate from any one of the phosphorus contents and the amount of sludge returned by the sludge return means, and adjusting the amount of the chemical added according to the injection rate and the amount of inflowing sewage.

A biological water treatment apparatus according to a twenty-first aspect of the present invention includes a biological reaction tank into which sewage flows, a means for adding a chemical, and a sedimentation for sedimenting a mixed solution flowing out of the biological reaction tank. A biological water treatment apparatus having a pond and a means for extracting precipitated excess sludge, wherein a means for measuring the amount of inflow sewage, and a redox potential in a biological reaction tank, a phosphorus concentration, Means for measuring any one of the phosphorus contents, a redox potential, a phosphorus concentration,
A means is provided for obtaining an injection rate from any one of the phosphorus contents and the excess sludge withdrawal amount extracted by the excess sludge withdrawing means, and adjusting the amount of chemicals added based on the injection rate and the amount of inflowing sewage. .

A biological water treatment apparatus according to a twenty-second aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein the amount of inflowing sewage is reduced. There are provided means for measuring, means for setting an upper limit of the amount of inflow sewage, and means for outputting a drug addition start signal when the amount of inflow sewage reaches the upper limit.

A biological water treatment apparatus according to a twenty-third aspect of the present invention is provided with a means for estimating a measured value at the time of adding a chemical based on each measured value flowing into a biological reaction tank or a mixing pond. is there.

A biological water treatment apparatus according to a twenty-fourth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows and a means for adding a chemical, wherein Means for measuring the phosphorus concentration in the anaerobic tank, means for setting the lower limit of the phosphorus concentration, and means for outputting a drug addition start signal when the phosphorus concentration reaches the lower limit are provided.

A biological water treatment apparatus according to a twenty-fifth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows and a means for adding a chemical, wherein Means for measuring the concentration of microorganisms in the anaerobic tank, means for setting the lower limit of the concentration of microorganisms, and means for outputting a drug addition start signal when the concentration of microorganisms reach the lower limit are provided.

A biological water treatment apparatus according to a twenty-sixth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein Means for measuring the phosphorus content in the phosphorus accumulating bacteria in the anaerobic tank, means for setting the upper limit of the phosphorus content, and means for outputting a drug addition start signal when the phosphorus content reaches the upper limit are provided. It is a thing.

A biological water treatment apparatus according to a twenty-seventh aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein Means for measuring the oxidation-reduction potential in the anaerobic tank;
Means for setting an upper limit value of the oxidation-reduction potential and means for outputting a drug addition start signal when the oxidation-reduction potential reaches the upper limit value are provided.

A biological water treatment apparatus according to a twenty-eighth aspect of the present invention is a biological water treatment apparatus having a biological reaction tank into which sewage flows and an aeration device is attached, and a means for adding a chemical. Means are provided for setting an upper limit value or a lower limit value of the amount of aeration by the aeration device, and for outputting a drug addition start signal when the aeration amount reaches the upper limit value or the lower limit value.

A biological water treatment apparatus according to a twenty-ninth aspect of the present invention provides a biological reaction tank into which sewage flows, a means for adding a chemical, and a sedimentation treatment for sedimenting a mixed solution flowing out of the biological reaction tank. A biological water treatment apparatus having a pond and a means for returning the settled sludge to the biological reaction tank, wherein a means for setting an upper limit or a lower limit of the amount of sludge returned by the sludge return means; and Means for outputting a drug addition start signal when the upper limit value or the lower limit value is reached.

A biological water treatment apparatus according to claim 30 of the present invention comprises a biological reaction tank into which sewage flows, a means for adding a chemical, and a sedimentation for sedimenting a mixed solution flowing out of the biological reaction tank. A biological water treatment apparatus having a pond and a means for extracting precipitated excess sludge, a means for setting an upper limit or a lower limit of the amount of excess sludge withdrawn by the excess sludge withdrawing means, Means for outputting a chemical addition start signal when the sludge withdrawal amount reaches the upper limit value or the lower limit value.

[0046]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a is a pipe for inflowing sewage, and is connected to a biological reaction tank 1. This biological reaction tank 1 is an anaerobic tank 2 and an aerobic tank 3 described later in the anaerobic aerobic activated sludge method. However, in the present embodiment, the present invention is applicable to other biological reaction vessels. Reference numeral 4 denotes an aeration device for supplying air to the biological reaction tank 1, and reference numeral 5 denotes a sedimentation pond for precipitating a mixed solution containing microorganisms, and is connected to the aerobic tank 3 via a pipe b. c is a pipe for discharging the supernatant water after the precipitation treatment, and is connected to the sedimentation basin 5. Reference numeral 6 denotes a pump for discharging surplus microorganisms out of the system, and is connected to the sedimentation basin 5 via a pipe d. The pipe e is a pipe connected to the pump 6. Reference numeral 7 denotes a pump for returning the microorganisms to the biological reaction tank 1, and a settling tank 5 through a pipe d.
In addition, it is connected to the biological reaction tank 1 via a pipe f.

The sewage is introduced into the biological reaction tank 1 through a pipe a. In the biological reaction tank 1, pollutants in the sewage are biologically oxidatively decomposed by mixing and stirring the air supplied from the aeration device 4 with sewage and activated sludge. The liquid mixture of the sewage and the activated sludge is sent to the sedimentation basin 5 via the pipe b. In the sedimentation basin 5, after the activated sludge is settled and separated, the pipe c
The supernatant water is discharged through. Part of the activated sludge is drawn out of the system via the pump 6 and the pipe e, and the other excess sludge is returned to the anaerobic tank 2 via the pump 7 and the pipe f. Reference numeral 8 denotes a storage tank for a coagulant as a medicine, and reference numeral 9 denotes an injection pump, which is connected to the storage tank 8 via a pipe g. h is a pipe for guiding the coagulant, which is a drug, to the biological reaction tank 1, and is connected to the injection pump 9. Hereinafter, the description will proceed with the assumption that the agent to be injected into the biological reaction tank 1 is a flocculant.

In the present embodiment, the amount of phosphorus flowing into the coagulant addition position is determined from the flow rate of the incoming sewage and the phosphorus concentration. Reference numeral 10 denotes a flow meter attached to the pipe a, and reference numeral 11 denotes a phosphorus concentration meter for measuring the phosphorus concentration in the inflow sewage. Numeral 12 is an arithmetic unit for calculating the amount of phosphorus flowing into the coagulant addition position per unit time from the measurement values of the flow meter 10 and the phosphorus concentration meter 11, and the flow meter 10 is connected to the flow meter 10 via a signal line 10a. Further, it is connected to the phosphorus concentration meter 11 via a signal line 11a.

Reference numeral 13 denotes a setter for setting a target value of the amount of phosphorus flowing out per unit time from the sedimentation tank 5 through the pipe c as a target value of the amount of phosphorus flowing out of the biological water treatment apparatus. It is. Numeral 14 denotes a controller for adjusting the amount of coagulant added in accordance with the difference between the above-mentioned inflowing phosphorus amount and the outflowing phosphorus amount. The computing unit 12 is connected via a signal line 12a and the controller 12 via a signal line 13a. It is connected to the setting device 13. The regulator 14 is also connected to the infusion pump 9 via a signal line 14a.

In this embodiment, the flow meter 10
There is no limitation on the positional relationship between the phosphorus concentration meter 11 and the phosphorus concentration meter 11, and there is no problem even if the phosphorus concentration meter 11 is arranged on the upstream side and the flow meter 10 is arranged on the downstream side. Further, the phosphorus concentration meter 11 may be installed at another place and water may be collected from the pipe a, and it is of course possible to install the flow meter 10 on the pipe c.

Next, the operation will be described. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10, and the measured value is sent to the calculator 12 via the signal line 10a. The phosphorus concentration in the sewage is measured by a phosphorus concentration meter 11, and the measured value is sent to a calculator 12 via a signal line 11a. Arithmetic unit 1
In step 2, the amount of phosphorus flowing into the coagulant addition position per unit time is calculated from the measured values of the flow meter 10 and the phosphorus concentration meter 11 according to, for example, equation (1.1).

Pin = Qin × CPin−Pbio (1.1) where: Pin: amount of phosphorus flowing into the flocculant addition position per unit time Qin: measurement value of flow meter 10 CPin: measurement of phosphorus concentration meter 11 Value Pbio: amount of phosphorus to be biologically removed The output of the arithmetic unit 12 is supplied to a controller 14 via a signal line 12a.
Conveyed to. Further, the target value of the amount of phosphorus discharged per unit time set in the setting unit 13 is transmitted to the controller 14 via the signal line 13a.

The controller 14 outputs the amount of coagulant added per unit time according to the equation (1.2), for example, according to the difference between the above-mentioned inflow phosphorus amount and the outflow phosphorus amount target value. Qcg = Kcg1 (Pin-Pout0) (1.2) Where, Qcg: amount of coagulant added per unit time Kcg1: constant Pout0: target value of the amount of phosphorus discharged per unit time

The output of the controller 14 is transmitted to the infusion pump 9 via a signal line 14a. Thereby, when the amount of phosphorus flowing into the coagulant addition position increases, the coagulant addition amount increases accordingly. Conversely, when the amount of phosphorus flowing into the coagulant addition position decreases, the coagulant addition amount decreases accordingly. That is, even when the amount of the water to be treated and the phosphorus concentration fluctuate, the required amount of the coagulant can be added quickly, so that the effect of reliably reducing the amount of phosphorus flowing out from the biological water treatment apparatus can be obtained. Play.

Embodiment 2 FIG. 2 is a configuration diagram showing a flocculant adding device in the biological water treatment device according to the second embodiment. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In the present embodiment, the amount of phosphorus flowing into the flocculant addition position is determined from the flow rate of the flowing sewage and the phosphorus concentration in the reaction tank.
Reference numeral 15 denotes a phosphorus concentration meter for measuring the phosphorus concentration in the biological reaction tank 1, and reference numeral 12 denotes the amount of phosphorus flowing into the coagulant addition position per unit time from the measured values of the flow meter 10 and the phosphorus concentration meter 15. And a signal line 10a
And a phosphorus concentration meter 15 via a signal line 15a.

FIG. 2 does not limit the position of the phosphorus concentration meter 15 at all. The phosphorus concentration meter 15 may be installed at another place and water may be collected from the biological reaction tank 1. Also, the flow meter 10 may be installed in the pipe c.

Next, the operation will be described. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10, and the measured value is sent to the calculator 12 via the signal line 10a. The phosphorus concentration in the biological reaction tank 1 is measured by a phosphorus concentration meter 15,
The measured value is sent to the arithmetic unit 12 via the signal line 15a.
The calculator 12 calculates the amount of phosphorus flowing into the coagulant addition position per unit time from the measured values of the flow meter 10 and the phosphorus concentration meter 15 according to, for example, equation (2.1). Pin = Qin × CPtnk (2.1) where, CPtnk: a measurement value of the phosphorus concentration meter 15 The operation is the same as in the first embodiment.

Thus, when the amount of phosphorus flowing into the coagulant addition position increases, the coagulant addition amount increases accordingly. Conversely, when the amount of phosphorus flowing into the coagulant addition position decreases, the coagulant addition amount decreases accordingly. That is, even when the amount of the water to be treated and the phosphorus concentration fluctuate, the required amount of the coagulant can be added quickly, so that the effect of reliably reducing the amount of phosphorus flowing out from the biological water treatment apparatus can be obtained. Play.

Embodiment 3 FIG. 3 is a configuration diagram showing a coagulant adding device in the biological water treatment device according to the third embodiment. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In the present embodiment, the amount of phosphorus flowing into the coagulant addition position is determined from the flow rate of the incoming sewage, the concentration of phosphorus in the sewage, and the concentration of phosphorus in the biological reaction tank 1.

Reference numeral 11 denotes a phosphorus concentration meter for measuring the phosphorus concentration in the inflowing sewage, and 15 denotes a phosphorus concentration meter for measuring the phosphorus concentration in the biological reaction tank 1. Numeral 12 is an arithmetic unit for calculating the amount of phosphorus flowing into the coagulant addition position per unit time from the measured values of the flow meter 10 and the phosphorus concentration meters 11 and 15, and the flow meter 10 is connected via a signal line 10a. And the phosphorus concentration meter 11 via a signal line 11a and the phosphorus concentration meter 15 via a signal line 15a. Others are Figures 1 and 2.
Is the same as In the present embodiment, the positions of the phosphorus concentration meters 11 and 15 and the flow meter 10 are not limited at all, as in the first and second embodiments.

Next, the operation will be described. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10, and the measured value is sent to the calculator 12 via the signal line 10a. The phosphorus concentration in the sewage is measured by the phosphorus concentration meter 11, and the phosphorus concentration in the biological reaction tank 1 is measured by the phosphorus concentration meter 15, and the respective measured values are calculated via the signal line 11a and the signal line 15a.
Sent to 2. The computing unit 12 first estimates the phosphorus concentration at the coagulant addition position from the measured values of the flow meter 10 and the phosphorus concentration meters 11 and 15 according to, for example, equation (3.1).

CPcg = CPin−xb (CPin−CPtnk) / xa (3.1) where xa: distance from the inflow position of sewage to the installation position of the phosphorus concentration meter 11 xb: from the installation position of the phosphorus concentration meter 11 Distance to Coagulant Addition Position Using this CPcg, the amount of phosphorus flowing into the coagulant addition position per unit time is calculated, for example, according to equation (3.2). Pin = Qin × CPcg (3.2) Hereinafter, the same operation as in the first embodiment is performed.

Thus, in addition to the same effects as in the first embodiment, even when, for example, a distribution of the phosphorus concentration exists in the biological reaction tank 1, the amount of phosphorus flowing into the coagulant addition position is accurately estimated. Therefore, there is an effect that the amount of phosphorus flowing out from the biological water treatment apparatus can be more reliably reduced.

Embodiment 4 In the third embodiment, the apparatus is configured to estimate the phosphorus concentration at the coagulant addition position from the phosphorus concentration in the inflowing sewage and the phosphorus concentration in the biological reaction tank, but a plurality of phosphorus concentration meters are provided in the biological reaction tank. Prepared,
The same effect can be obtained even if the apparatus is configured to estimate the phosphorus concentration at the coagulant addition position using the measured value.

Embodiment 5 FIG. 4 is a configuration diagram showing a coagulant adding device in a biological water treatment device according to Embodiment 5. In the drawings, the same reference numerals as those in FIGS. 1 to 3 indicate the same or corresponding parts. In the present embodiment, the coagulant addition position is configured in a mixing pond provided after the biological reaction tank 1. Reference numeral 16 denotes a mixing pond for mixing the supernatant water and the flocculant after the sedimentation treatment, and is connected to the sedimentation pond 5 via a pipe c. i is a pipe for sending the mixed liquid mixed with the coagulant to the precipitation treatment step.
Is connected to

The supernatant water discharged from the sedimentation basin 5 is supplied to the pipe c
Is sent to the mixing pond 16. In the mixing pond 16, the supernatant water and the flocculant are mixed and stirred. The mixed solution after mixing the coagulant is sent to the next precipitation treatment step via the pipe i. Reference numeral 17 denotes a phosphorus concentration meter for measuring the phosphorus concentration in the supernatant water after the precipitation treatment, and reference numeral 18 denotes a flow meter attached to the pipe c. Numeral 12 denotes an arithmetic unit for calculating the amount of phosphorus flowing into the coagulant addition position per unit time from the measured values of the flow meter 18 and the phosphorus concentration meter 17, and the flow meter 18 is connected to the flow meter 18 via a signal line 18a. Further, it is connected to the phosphorus concentration meter 17 via a signal line 17a. Others are the same as FIG.
In the present embodiment, the positions of the phosphorus concentration meter 17 and the flow meter 18 are not limited at all.
This is the same as the above embodiment.

Next, the operation will be described. Mixing pond 16
Is measured by a flow meter 18 and the measured value is sent to the calculator 12 via a signal line 18a. The phosphorus concentration in the supernatant water is measured by a phosphorus concentration meter 17, and the measured value is sent to the arithmetic unit 12 via a signal line 17a. Arithmetic unit 1
In step 2, the amount of phosphorus flowing into the coagulant addition position per unit time is calculated from the measured values of the flow meter 18 and the phosphorus concentration meter 17 according to, for example, equation (5.1). Pin = Qin × CPsd (5.1) where, CPsd: the measurement value of the phosphorus concentration meter 17 Hereinafter, the operation is the same as in the first embodiment.

Thus, when the amount of phosphorus flowing into the coagulant addition position increases, the coagulant addition amount increases accordingly. Conversely, when the amount of phosphorus flowing into the coagulant addition position decreases, the coagulant addition amount decreases accordingly. That is, even when the amount of the water to be treated and the phosphorus concentration fluctuate, the required amount of the coagulant can be added quickly, so that the effect of reliably reducing the amount of phosphorus flowing out from the biological water treatment apparatus can be obtained. Play. As is clear from the above description, the coagulant adding device installed in the biological water treatment device can be applied regardless of the type of the biological water treatment device and the coagulant adding position.

Embodiment 6 FIG. FIG. 5 is a configuration diagram showing a flocculant adding device in the biological water treatment device according to the sixth embodiment. In the drawings, the same reference numerals as those in FIGS. 1 to 4 indicate the same or corresponding parts. In the present embodiment, the amount of phosphorus flowing into the coagulant addition position is estimated in consideration of the time required for analyzing the phosphorus concentration. Reference numeral 19 denotes a storage circuit for accumulating data of the flow rate and the phosphorus concentration of the inflowing sewage, and the flow meter 10 via a signal line 10a and the phosphorus concentration meter 11 via a signal line 11a.
Are connected to the arithmetic unit 12 via a signal line 19a. Note that, in the present embodiment, the positions of the phosphorus concentration meter 11 and the flow meter 10 are not limited at all, as in the above embodiment.

Next, the operation will be described. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10, and the measured value is sent to the storage circuit 19 via the signal line 10a. The phosphorus concentration in the sewage is measured by the phosphorus concentration meter 11, and the measured value is sent to the storage circuit 19 via the signal line 11a. The computing unit 12 first estimates the amount of phosphorus inflow Pinest at the time of adding the flocculant using the data stored in the storage circuit 19. This can be easily performed using a statistical analysis method such as the least square method. This estimated value Pinest is transmitted to the controller 14 via the signal line 12a. Hereinafter, it operates similarly to the case of Embodiment 1.

Thus, in addition to the same effects as in the first embodiment, when the analysis of phosphorus takes time, the necessary amount of the flocculant can be determined in consideration of the fluctuation during the analysis, and the biological water can be obtained. This has the effect that the amount of phosphorus flowing out of the processing device can be more reliably reduced.

Embodiment 7 FIG. In the sixth embodiment, the device is configured to accumulate the inflow rate of sewage and the phosphorus concentration in the sewage in a storage circuit. However, a similar storage circuit is added to the device configuration described in the second to fourth embodiments. The same effect as in the sixth embodiment can be achieved.

Embodiment 8 FIG. In the above first to seventh embodiments, the apparatus is configured to set the target value of the amount of phosphorus flowing out from the biological water treatment apparatus. It is also possible to configure the apparatus so as to set the target value and determine the target value of the amount of discharged phosphorus from these.

Embodiment 9 FIG. 6 is a configuration diagram illustrating a coagulant adding device in a biological water treatment apparatus according to Embodiment 9. In the drawings, the same reference numerals as those in FIGS. 1 to 5 indicate the same or corresponding parts. In the present embodiment,
The amount of phosphorus flowing out of the biological water treatment apparatus is determined from the flow rate and the phosphorus concentration of the effluent.
Reference numeral 20 denotes a flow meter attached to the pipe c, and reference numeral 21 denotes a phosphorus concentration meter that measures the phosphorus concentration in the effluent from the pipe c.
Numeral 12 denotes an arithmetic unit for calculating the amount of phosphorus flowing out of the biological water treatment apparatus per unit time from the measured values of the flow meter 20 and the phosphorus concentration meter 21, and a signal line 20a
And the phosphorus concentration meter 21 via a signal line 21a.

Reference numeral 13 denotes a setter for setting a target value of the amount of phosphorus flowing out of the sedimentation tank 5 per unit time via the pipe c as a target value of the amount of phosphorus flowing out of the biological water treatment apparatus. It is. Numeral 14 designates a regulator for adjusting the amount of coagulant added in accordance with the difference between the amount of the discharged phosphorus and the target value of the amount of discharged phosphorus. The controller 14 is connected via the signal line 12a and the controller 12 via the signal line 13a. It is connected to the setting device 13. The regulator 14 is also connected to the infusion pump 9 via a signal line 14a.

In this embodiment, the flow meter 20
There is no limitation on the positional relationship between the phosphorus concentration meter 21 and the phosphorus concentration meter 21, and there is no problem even if the phosphorus concentration meter 21 is arranged on the downstream side and the flow meter 20 is arranged on the upstream side. In addition, phosphorus concentration meter 2
1 may be installed in another place and water may be collected from the pipe c, and the flow meter 20 may be installed in the pipe a.

Next, the operation will be described. The amount of treated water flowing out of the biological reaction tank 1 is measured by the flow meter 20,
The measured value is sent to the arithmetic unit 12 via the signal line 20a.
The phosphorus concentration in the treated water is measured by a phosphorus concentration meter 21, and the measured value is sent to the arithmetic unit 12 via a signal line 21a. The calculator 12 calculates the amount of phosphorus flowing into the coagulant addition position per unit time from the measurement values of the flow meter 20 and the phosphorus concentration meter 21 according to, for example, equation (9.1). Pout = Qout × CPout (9.1) where, Pout: the amount of phosphorus flowing into the flocculant addition position per unit time. Qout: the measured value of the flow meter 20. CPout: the measured value of the phosphorus concentration meter 21.

The output of the arithmetic unit 12 is transmitted to the controller 14 via the signal line 12a. The target value of the amount of phosphorus discharged per unit time set in the setting unit 13 is the signal line 1
The signal is transmitted to the controller 14 via 3a. In the controller 14, the amount of coagulant added per unit time is calculated according to, for example, the equation (9.
Output according to 2). Qcg = Kcg9 (Pout-Pout0) (9.2) where, Qcg: amount of coagulant added per unit time Kcg9: constant Pout0: target value of the amount of phosphorus discharged per unit time The output of the controller 14 is a signal line. It is transmitted to the infusion pump 9 via 14a.

Thus, when the amount of phosphorus flowing out of the biological water treatment device increases, the amount of the flocculant increases accordingly. Conversely, when the amount of phosphorus flowing out of the biological water treatment device decreases, the amount of the flocculant added decreases accordingly. That is, even when the amount of the water to be treated and the phosphorus concentration fluctuate, the required amount of the coagulant can be added without excess and deficiency, so that the amount of phosphorus flowing out from the biological water treatment apparatus can be reliably reduced. It works.

Embodiment 10 FIG. FIG. 7 shows Embodiment 10
It is a lineblock diagram showing a flocculant addition device in a biological water treatment device concerning. In the figures, the same reference numerals as those in FIGS. 1 to 6 indicate the same or corresponding parts. In the present embodiment, the feedforward term is calculated by using the amount of phosphorus flowing into the coagulant addition position, and the feedback term is calculated by using the amount of phosphorus discharged from the biological water treatment apparatus, so that the coagulant addition is performed. It is configured to adjust the amount. 20
Is a flow meter attached to the pipe c, 21 is a phosphorus concentration meter for measuring the phosphorus concentration in the effluent from the pipe c, and 11 is a phosphorus concentration meter for measuring the phosphorus concentration in the inflowing sewage.

Numeral 12 is used to calculate the amount of phosphorus flowing into the coagulant addition position and the amount of phosphorus flowing out of the biological water treatment apparatus per unit time from the measured values of the flow meter 20, the phosphorus concentration meters 11 and 21, and And the signal line 2
The flowmeter 20 is connected to the flowmeter 0 via a signal line 11a, the phosphorus concentration meter 11 via a signal line 11a, and the phosphorus concentration meter 21 via a signal line 21a.

Reference numeral 13 denotes a setter for setting a target value of the amount of phosphorus flowing out of the sedimentation basin 5 per unit time via the pipe c as a target value of the amount of phosphorus flowing out of the biological water treatment apparatus. , 14 are controllers for adjusting the amount of coagulant to be added in accordance with the difference between the target value of the inflowing phosphorus amount and the target value of the outflowing phosphorus amount and the difference between the target value of the discharging phosphorus amount and the target value of the discharging phosphorus amount. The arithmetic unit 12 and the signal line 13 are connected via a line 12a.
It is connected to the setting device 13 via a. Controller 1
4 is also connected to the infusion pump 9 via the signal line 14a.

In this embodiment, the flow meter 2
0, the positional relationship between the phosphorus concentration meters 11 and 21 is not limited at all.
There is no problem even if 0 is on the upstream side. Alternatively, the phosphorus concentration meter 11 may be installed in another place and water may be collected from the pipe a. Similarly, the phosphorus concentration meter 21 may be installed in another place and the pipe c
You may make it take water from. Further, the flow meter 20 may be installed on the pipe a.

Next, the operation will be described. Biological reaction tank 1
The amount of treated water flowing out of the apparatus is measured by the flow meter 20, and the measured value is sent to the calculator 12 via the signal line 20a. The phosphorus concentration in the incoming sewage is measured by a phosphorus concentration meter 11, and the measured value is sent to a calculator 12 via a signal line 11a. The concentration of phosphorus in the treated water is measured by a phosphorus concentration meter 21,
The measured value is sent to the arithmetic unit 12 via the signal line 21a.

The arithmetic unit 12 calculates the amount of phosphorus flowing into the coagulant addition position per unit time from the measured values of the flow meter 20 and the phosphorus concentration meters 11 and 21 according to, for example, the equation (1.1). The amount of phosphorus flowing out of the biological water treatment device per unit time is calculated according to, for example, equation (9.1). The output of the calculator 12 is transmitted to the controller 14 via the signal line 12a. Further, the target value of the amount of phosphorus discharged per unit time set in the setting unit 13 is transmitted to the controller 14 via the signal line 13a.

In the controller 14, the amount of coagulant added per unit time is determined according to the difference between the target value of the inflowing phosphorus amount and the target value of the outflowing phosphorus amount and the difference between the target amount of the discharging phosphorus amount and the target value of the outflowing phosphorus amount. Is output, for example, according to equation (10.1). Qcg = Kcg101 (Pin-Pout0) + Kcg102 (Pout-Pout0) (10.1) where Kcg101: constant Kcg102: constant

The output of the regulator 14 is transmitted to the infusion pump 9 via the signal line 14a. Thus, even when the amount of water to be treated and the phosphorus concentration fluctuate, not only can the required amount of the coagulant be added quickly, but also the amount of addition can be adjusted based on the phosphorus concentration of the treated water without excess or deficiency. This has the effect that the amount of phosphorus flowing out of the biological water treatment device can be more reliably reduced.

Embodiment 11 FIG. In the ninth and tenth embodiments, the case where the coagulant is added to the end of the biological reaction tank 1 and the sedimentation treatment is performed in the sedimentation basin 5 is described. It can also be provided in the mixing pond 16 provided after 1. In this case, the flow meter 20 and the phosphorus concentration meter 21
Will be attached to the pipe i. As described above, the coagulant adding device in the biological water treatment device can be applied regardless of the type of the biological water treatment device and the coagulant addition position.

Embodiment 12 FIG. Embodiment 9 and Embodiment 9
0, a storage circuit for accumulating the flow rate of the treated water and the phosphorus concentration is provided, as in the sixth and seventh embodiments.
The device can also be configured to use these data to estimate the amount of phosphorus effluent from the biological water treatment device. In this case, even when it takes time to analyze phosphorus, the required amount of coagulant can be determined in consideration of the fluctuation during this period. This produces an effect that the amount of phosphorus to be reduced can be more reliably reduced.

Embodiment 13 FIG. Embodiments 9 to 12 above
In the above, the apparatus was configured to set a target value of the amount of phosphorus flowing out of the biological water treatment apparatus, but a reference flow rate of the treated water and a target treated water phosphorus concentration were set,
The apparatus can also be configured to determine the target value of the amount of phosphorus flowing out from these.

Embodiment 14 FIG. FIG. 8 shows Embodiment 14
It is a lineblock diagram showing a flocculant addition device in a biological water treatment device concerning. In the drawings, the same reference numerals as those in FIGS. 1 to 7 indicate the same or corresponding parts. In the present embodiment, as a means for detecting the phosphorus removing activity of microorganisms in the biological reaction tank 1, a phosphorus concentration meter for measuring the phosphorus concentration in the anaerobic tank 2 is provided. Reference numeral 2 denotes an anaerobic tank in the biological reaction tank 1, reference numeral 3 denotes an aerobic tank, and reference numeral 22 denotes a phosphorus concentration meter for measuring the phosphorus concentration in the anaerobic tank 2. Reference numeral 23 denotes a controller for adjusting the amount of the flocculant added in accordance with the measured value of the phosphorus concentration meter 22, and the phosphorus concentration meter 22 and the signal line 2 are connected via a signal line 22a.
It is also connected to the infusion pump 9 via 3a. Also,
Reference numeral 10 denotes a flow meter attached to the pipe a.
0a is connected to the controller 23.

In the present embodiment, the positions of the phosphorus concentration meter 22 and the flow meter 10 are not limited at all, and the phosphorus concentration meter 22 is installed in another place and water is collected from the anaerobic tank 2. You may. Further, the flow meter 10 is provided with a pipe c
It may be attached to.

Next, the operation will be described. The phosphorus concentration in the anaerobic tank 2 is measured by a phosphorus concentration meter 22, and the measured value is transmitted to a controller 23 via a signal line 22a. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a. Controller 23
First, the coagulant injection rate is determined according to the measured value of the phosphorus concentration. The coagulant injection rate is calculated by, for example, the equation (14.
Compute according to 1). Rcg = Kcg14 / Pana (14.1) where, Rcg: coagulant injection rate Kcg14: constant Pana: phosphorus concentration in anaerobic tank 2

Next, the coagulant addition amount is determined from the above-mentioned injection rate and the above-mentioned inflow sewage amount. The amount of the coagulant added is output, for example, according to equation (14.2). Qcg = Rcg × Qin (14.2) The output of the controller 23, that is, the amount of the coagulant added is determined by the signal line 2
It is transmitted to the infusion pump 9 via 3a.

Thus, when the phosphorus concentration in the anaerobic tank 2 is low, it is considered that the amount of phosphorus discharged from the phosphorus accumulating bacteria in the activated sludge is small, that is, the phosphorus removing activity of the activated sludge microorganisms is low, and the amount of the added flocculant is considered. Increase. Conversely, when the phosphorus concentration is high, it is considered that phosphorus is discharged from the phosphorus accumulating bacteria in the activated sludge smoothly, that is, the phosphorus removing activity of the activated sludge microorganisms is normal, and the amount of the flocculant added is reduced. That is, since the amount of the coagulant added can be appropriately adjusted according to the state of biological phosphorus removal, the effect of reliably reducing the amount of phosphorus flowing out from the biological water treatment apparatus is exhibited.

Embodiment 15 FIG. FIG. 9 shows Embodiment 15
It is a lineblock diagram showing a flocculant addition device in a biological water treatment device concerning. In the figures, the same reference numerals as those in FIGS. 1 to 8 indicate the same or corresponding parts. In the present embodiment, as a means for detecting the phosphorus removing activity of the microorganisms in the biological reaction tank 1, a measuring instrument for measuring the phosphorus content in the phosphorus accumulating bacteria in the anaerobic tank 2 is provided.

Reference numeral 24 denotes a measuring device for measuring the phosphorus content in the phosphorus-accumulating bacteria in the anaerobic tank 2, and reference numeral 23 denotes a controller for adjusting the amount of coagulant added in accordance with the measured value of the phosphorus content. The phosphorus content measuring device 24 via the line 24a and the signal line 2
It is connected to the infusion pump 9 via 3a. Also, 1
Reference numeral 0 denotes a flow meter attached to the pipe a.
It is connected to the controller 23 via a.

In the present embodiment, the positions of the phosphorus content measuring device 24 and the flow meter 10 are not limited at all, and the phosphorus content measuring device 24 is installed at another place, and is taken from the anaerobic tank 2. You may make it water. Further, the flow meter 10 may be attached to the pipe c.

Next, the operation will be described. The phosphorus content in the phosphorus accumulating bacteria in the anaerobic tank 2 is measured by a phosphorus content measuring device 24, and the measured value is transmitted to a controller 23 via a signal line 24a. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a. The controller 23 first determines the coagulant injection rate according to the measured value of the phosphorus content.

The coagulant injection rate is calculated, for example, according to the equation (15.1). Rcg = Kcg15 × Pacm (15.1) Here, Kcg15: constant Pacm: phosphorus content of the phosphorus accumulating bacterium Next, the coagulant addition amount is determined from the above injection rate and the above inflowing sewage amount. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2). The output of the controller 23, that is, the added amount of the flocculant is transmitted to the infusion pump 9 via the signal line 23a.

Thus, when the phosphorus content of the phosphorus accumulating bacteria in the anaerobic tank 2 is large, the amount of phosphorus discharged from the phosphorus accumulating bacteria is small, that is, the phosphorus removing activity of the activated sludge microorganisms is considered to be low, and the amount of the flocculant added is determined. increase. Conversely, when the phosphorus content is low, the phosphorus discharge from the phosphorus accumulating bacteria is performed smoothly, that is, the phosphorus removal activity of the activated sludge microorganisms is considered to be normal, and the amount of the flocculant added is reduced. That is, since the amount of the coagulant added can be appropriately adjusted according to the state of biological phosphorus removal, the effect of reliably reducing the amount of phosphorus flowing out from the biological water treatment apparatus is exhibited.

Embodiment 16 FIG. FIG. 10 shows Embodiment 1
It is a block diagram which shows the flocculant addition apparatus in the biological water treatment apparatus concerning No. 6. In the figures, the same reference numerals as those in FIGS. 1 to 9 indicate the same or corresponding parts. In the present embodiment, the anaerobic tank 2 is provided with an oxidation-reduction potentiometer as a means for detecting the phosphorus removing activity of the microorganisms in the biological reaction tank 1.

Reference numeral 25 denotes an oxidation-reduction potentiometer attached to the anaerobic tank 2, and reference numeral 23 denotes a controller for adjusting the amount of coagulant to be added according to the measurement value of the oxidation-reduction potentiometer 25, via a signal line 25a. To the infusion pump 9 via the signal line 23a. Reference numeral 10 denotes a flow meter attached to the pipe a, which is connected to the controller 23 via the signal line 10a.

In the present embodiment, the positions of the oxidation-reduction potentiometer 25 and the flow meter 10 are not limited at all. The oxidation-reduction potentiometer 25 is installed at another place, and water is collected from the anaerobic tank 2. You may do so. Also, the flow meter 10
May be attached to the pipe c.

Next, the operation will be described. The oxidation-reduction potential of the anaerobic tank 2 is measured by the oxidation-reduction potentiometer 25, and the measured value is transmitted to the controller 23 via the signal line 25a. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a. The controller 23 first determines the coagulant injection rate according to the measured value of the oxidation-reduction potential.

The coagulant injection rate is calculated, for example, according to the equation (16.1). Rcg = Kcg16 × Vana (16.1) Here, Kcg16: constant Vana: oxidation-reduction potential Next, the coagulant addition amount is determined from the above injection rate and the above-mentioned inflow sewage amount. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2). The output of the controller 23, that is, the amount of the coagulant added, is transmitted to the infusion pump 9 via the signal line 23a.

Accordingly, when the oxidation-reduction potential in the anaerobic tank 2 is high, the amount of phosphorus discharged from the phosphorus accumulating bacteria is small.
That is, it is considered that the phosphorus removal activity of the activated sludge microorganisms is low, and the added amount of the flocculant is increased. Conversely, when the oxidation-reduction potential is low, the discharge of phosphorus from the phosphorus accumulating bacteria is performed smoothly.
That is, the phosphorus removal activity of the activated sludge microorganisms is normal,
And reduce the amount of flocculant added. That is, since the amount of the coagulant added can be appropriately adjusted according to the state of biological phosphorus removal, the effect of reliably reducing the amount of phosphorus flowing out from the biological water treatment apparatus is exhibited.

Embodiment 17 FIG. FIG. 11 shows Embodiment 17
It is a lineblock diagram showing a flocculant addition device in a biological water treatment device concerning. In the drawings, the same reference numerals as those in FIGS. 1 to 10 indicate the same or corresponding parts. In the present embodiment, the apparatus is configured to detect the phosphorus removal activity of the biological reaction tank 1 by a value obtained by subtracting the phosphorus concentration in the inflow sewage from the phosphorus concentration in the anaerobic tank 2.

Reference numeral 11 denotes a phosphorus concentration meter for measuring the phosphorus concentration in the inflowed sewage, 22 denotes a phosphorus concentration meter for measuring the phosphorus concentration in the anaerobic tank 2, and 23 denotes a difference between the measured values of the phosphorus concentration meters 11 and 22. This is a controller for adjusting the amount of coagulant added, and is also connected to the phosphorus concentration meter 11 via the signal line 11a, the phosphorus concentration meter 22 via the signal line 22a, and the injection pump 9 via the signal line 23a. ing. Reference numeral 10 denotes a flow meter attached to the pipe a, which is connected to the controller 23 via the signal line 10a. In the present embodiment,
The positions of the phosphorus concentration meters 11 and 22 and the flow meter 10 are not limited at all, as in the other embodiments.

Next, the operation will be described. The phosphorus concentration in the incoming sewage is measured by the phosphorus concentration meter 11, and the measured value is transmitted to the controller 23 via the signal line 11a. Further, the phosphorus concentration in the anaerobic tank 2 is measured by a phosphorus concentration meter 22, and the measured value is transmitted to a controller 23 via a signal line 22a.
The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a.
In the controller 23, according to the difference between the measured values of the phosphorus concentration,
First, the coagulant injection rate is determined.

The coagulant injection rate is calculated, for example, according to the equation (17.1). Rcg = Kcg17 / (Pana-CPin) (17.1) where Kcg17: constant Pana: phosphorus concentration in the anaerobic tank 2 CPin: phosphorus concentration in the inflowing sewage Next, from the above injection rate and the above inflowing sewage amount, Determine the amount of coagulant added. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2).

The output of the controller 23, that is, the amount of the coagulant added, is transmitted to the infusion pump 9 via the signal line 23a.
Accordingly, in addition to the same effects as in the fourteenth embodiment, even when the concentration of phosphorus in the inflowing sewage fluctuates, the actual discharge amount of phosphorus can be accurately detected, so that the amount of phosphorus flowing out of the biological water treatment apparatus can be detected. This has the effect that the amount can be more reliably reduced.

Embodiment 18 FIG. FIG. 12 shows Embodiment 1.
It is a block diagram which shows the coagulant addition apparatus in the biological water treatment apparatus concerning No. 8. In the drawings, the same reference numerals as those in FIGS. 1 to 11 indicate the same or corresponding parts. In the present embodiment, as a means for detecting the phosphorus removing activity of the microorganisms in the biological reaction tank 1, a phosphorus concentration meter for measuring the phosphorus concentration in the aerobic tank 3 is provided.

Reference numeral 26 denotes a phosphorus concentration meter for measuring the phosphorus concentration in the aerobic tank 3, and reference numeral 23 denotes a controller for adjusting the amount of coagulant added in accordance with the measured value of the phosphorus concentration meter 26.
a and the infusion pump 9 via a signal line 23a. Reference numeral 10 denotes a flow meter attached to the pipe a, which is connected to the controller 23 via the signal line 10a. In the present embodiment, the positions of the phosphorus concentration meter 26 and the flow meter 10 are not limited at all, as in the other embodiments.

Next, the operation will be described. The phosphorus concentration in the aerobic tank 3 is measured by a phosphorus concentration meter 26, and the measured value is transmitted to a controller 23 via a signal line 26a. Further, the amount of inflow sewage in the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a. In the controller 23, first, according to the measured value of the phosphorus concentration,
Determine the flocculant injection rate. The coagulant injection rate is calculated, for example, according to the equation (18.1). Rcg = Kcg18 × Paer (18.1) where Kcg18: constant Paer: phosphorus concentration in the aerobic tank 3

Next, the coagulant addition amount is determined from the above-mentioned injection rate and the above-mentioned inflow sewage amount. The amount of the coagulant added is output, for example, according to equation (14.2). The output of the controller 23, that is, the amount of the coagulant added, is transmitted to the infusion pump 9 via the signal line 23a. Accordingly, when the phosphorus concentration in the aerobic tank 3 is high, it is considered that the phosphorus intake to the phosphorus accumulating bacteria is small, that is, the phosphorus removing activity of the activated sludge microorganisms is low, and the amount of the coagulant added is increased. Conversely, when the phosphorus concentration is low, it is considered that phosphorus is being taken up by the phosphorus accumulating bacteria smoothly, that is, the phosphorus removing activity of the activated sludge microorganisms is normal, and the amount of the flocculant added is reduced. That is, since the amount of the coagulant added can be appropriately adjusted according to the state of biological phosphorus removal, the effect of reliably reducing the amount of phosphorus flowing out from the biological water treatment apparatus is exhibited.

Embodiment 19 FIG. FIG. 13 shows the first embodiment.
It is a block diagram which shows the coagulant addition apparatus in the biological water treatment apparatus concerning No.9. In the drawings, the same reference numerals as those in FIGS. 1 to 12 indicate the same or corresponding parts. In the present embodiment, as a means for detecting the phosphorus removing activity of the microorganisms in the biological reaction tank 1, a measuring instrument for measuring the phosphorus content in the phosphorus accumulating bacteria in the aerobic tank 3 is provided.

Reference numeral 27 denotes a measuring device for the phosphorus content in the phosphorus accumulating bacteria attached to the aerobic tank 3, and 23 denotes a regulator for adjusting the amount of the flocculant added according to the measured value of the phosphorus content. The phosphorus content measuring device 27 is connected via a signal line 27a to the infusion pump 9 via a signal line 23a. Reference numeral 10 denotes a flow meter attached to the pipe a, which is connected to the controller 23 via a signal line 10a. In this embodiment, the phosphorus content measuring device 27 and the flow meter 1
As in the other embodiments, the position of 0 is not limited at all.

Next, the operation will be described. The phosphorus content in the phosphorus accumulating bacteria in the aerobic tank 3 is measured by a phosphorus content measuring device 27, and the measured value is transmitted to a controller 23 via a signal line 27a. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a.

The controller 23 first determines the coagulant injection rate according to the measured value of the phosphorus content. The coagulant injection rate is calculated, for example, according to equation (19.1). Rcg = Kcg19 / Pacmaer (19.1) Here, Kcg19: constant Pacmer: phosphorus content of the phosphorus accumulating bacteria Next, the coagulant addition amount is determined from the above injection rate and the above inflowing sewage amount. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2). The output of the controller 23, that is, the amount of the coagulant added, is transmitted to the infusion pump 9 via the signal line 23a.

Thus, when the phosphorus content of the phosphorus accumulating bacteria in the aerobic tank 3 is small, it is considered that the phosphorus uptake by the phosphorus accumulating bacteria is small, that is, the phosphorus removing activity of the activated sludge microorganisms is low, and the coagulant is added. Increase the amount. Conversely, when the phosphorus content is high, it is assumed that the phosphorus uptake by the phosphorus accumulating bacteria is proceeding smoothly, that is, the phosphorus removing activity of the activated sludge microorganisms is normal, and the amount of the flocculant added is reduced. That is, since the amount of the coagulant added can be appropriately adjusted according to the state of biological phosphorus removal, the effect of reliably reducing the amount of phosphorus flowing out from the biological water treatment apparatus is exhibited.

Embodiment 20 FIG. FIG. 14 shows Embodiment 2
It is a block diagram which shows the flocculant addition apparatus in the biological water treatment apparatus concerning No. 0. In the figures, the same reference numerals as those in FIGS. 1 to 13 indicate the same or corresponding parts. In the present embodiment, the aerobic tank 3 is provided with an oxidation-reduction potentiometer as means for detecting the phosphorus removing activity of microorganisms in the biological reaction tank 1.

Reference numeral 28 denotes an oxidation-reduction potentiometer attached to the aerobic tank 3. Reference numeral 23 denotes an adjuster for adjusting the amount of coagulant added in accordance with the measured value of the oxidation-reduction potential. The oxidation-reduction potentiometer 28 is connected to the injection pump 9 via the signal line 23a. Reference numeral 10 denotes a flow meter attached to the pipe a, which is connected to the controller 23 via the signal line 10a. In the present embodiment, the positions of the oxidation-reduction potentiometer 28 and the flow meter 10 are not limited at all, as in the other embodiments.

Next, the operation will be described. The oxidation-reduction potential of the aerobic tank 3 is measured by an oxidation-reduction potentiometer 28, and the measured value is transmitted to the controller 23 via a signal line 28a. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a. The controller 23 first determines the coagulant injection rate according to the measured value of the oxidation-reduction potential.

The coagulant injection rate is calculated, for example, according to the equation (20.1). Rcg = Kcg20 / Vaer (20.1) Here, Kcg20: constant Vaer: redox potential Next, the amount of coagulant added is determined from the above injection rate and the above-mentioned inflow sewage amount. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2). The output of the controller 23, that is, the amount of the coagulant added, is transmitted to the infusion pump 9 via the signal line 23a.

Thus, when the oxidation-reduction potential of the aerobic tank 3 is low, it is considered that the phosphorus uptake by the phosphorus accumulating bacteria is small, that is, the phosphorus removing activity of the activated sludge microorganisms is low, and the amount of the coagulant added is increased. Conversely, when the oxidation-reduction potential is high, it is assumed that phosphorus is taken up by the phosphorus accumulating bacteria smoothly, that is, the phosphorus removing activity of the activated sludge microorganisms is normal, and the amount of the flocculant added is reduced. That is, since the amount of the flocculant to be added can be appropriately adjusted according to the state of biological phosphorus removal, there is an effect that the amount of phosphorus flowing out from the biological water treatment storage can be reliably reduced.

Embodiment 21 FIG. FIG. 15 shows Embodiment 21
It is a lineblock diagram showing a flocculant addition device in a biological water treatment device concerning. In the drawings, the same reference numerals as those in FIGS. 1 to 14 indicate the same or corresponding parts. In the present embodiment, the activity of removing phosphorus from microorganisms in the biological reactor 1 is
The apparatus is configured to detect a value obtained by subtracting the phosphorus concentration in the inflow sewage from the phosphorus concentration in the aerobic tank 3.

Reference numeral 11 denotes a phosphorus concentration meter for measuring the phosphorus concentration of inflow sewage, and reference numeral 26 denotes a phosphorus concentration meter attached to the aerobic tank 3. Reference numeral 23 denotes a controller for adjusting the amount of coagulant to be added in accordance with the difference between the measured values of the phosphorus concentration meters 11 and 26, and the phosphorus concentration meter 11 via the signal line 11a and the phosphorus concentration meter 11 via the signal line 26a. The densitometer 26 is also connected to the infusion pump 9 via the signal line 23a. Reference numeral 10 denotes a flow meter attached to the pipe a, which is connected to the controller 23 via the signal line 10a. In the present embodiment,
It is the same as the other embodiments that the positions of the phosphorus concentration meters 11, 26 and the flow meter 10 are not limited at all.

Next, the operation will be described. The phosphorus concentration in the incoming sewage is measured by the phosphorus concentration meter 11, and the measured value is transmitted to the controller 23 via the signal line 11a. The phosphorus concentration in the aerobic tank 3 is measured by a phosphorus concentration meter 26, and the measured value is transmitted to the controller 23 via a signal line 26a.
The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a.

The controller 23 first determines the coagulant injection rate in accordance with the difference in the measured phosphorus concentration. The coagulant injection rate is calculated, for example, according to equation (21.1). Rcg = Kcg21 / (Pin-Paer) (21.1) where, Kcg21: constant Paer: phosphorus concentration in the aerobic tank 3 Pin: phosphorus concentration in the inflowing sewage Next, from the above injection rate and the above inflowing sewage amount, And the amount of coagulant added. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2).

The output of the controller 23, that is, the amount of the coagulant added, is transmitted to the infusion pump 9 via the signal line 23a.
Thereby, in addition to the same effects as those of the eighteenth embodiment, even when the concentration of phosphorus in the inflowing sewage changes, the substantial amount of intake of phosphorus can be accurately detected. This has the effect that the amount can be more reliably reduced.

Embodiment 22 FIG. FIG. 16 shows the second embodiment.
It is a block diagram which shows the flocculant addition apparatus in the biological water treatment apparatus concerning No. 2. In the drawings, the same reference numerals as those in FIGS. 1 to 15 indicate the same or corresponding parts. In the present embodiment, the apparatus is configured to detect the phosphorus removal activity of microorganisms in the biological reaction tank 1 by a value obtained by subtracting the phosphorus concentration in the aerobic tank 3 from the phosphorus concentration in the anaerobic tank 2. is there.

Reference numeral 22 denotes a phosphorus concentration meter attached to the anaerobic tank 2, and 26 denotes a phosphorus concentration meter attached to the aerobic tank 3. Reference numeral 23 denotes a controller for adjusting the amount of coagulant to be added in accordance with the difference between the measured values of the phosphorus concentration meters 22 and 26, and the phosphorus concentration meter 22 via a signal line 22a and the phosphorus concentration meter 22 via a signal line 26a. The densitometer 26 is also connected to the infusion pump 9 via the signal line 23a. Reference numeral 10 denotes a flow meter attached to the pipe a, and the controller 2 is connected via a signal line 10a.
3 is connected. In the present embodiment, the positions of the phosphorus concentration meters 22, 26 and the flow meter 10 are not limited at all, as in the other embodiments.

Next, the operation will be described. The phosphorus concentration in the anaerobic tank 2 is measured by a phosphorus concentration meter 22, and the measured value is transmitted to a controller 23 via a signal line 22a. The phosphorus concentration in the aerobic tank 3 is measured by a phosphorus concentration meter 26, and the measured value is transmitted to the controller 23 via a signal line 26a.
The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a.
In the controller 23, according to the difference between the measured values of the phosphorus concentration,
First, the coagulant injection rate is determined. The coagulant injection rate is output, for example, according to equation (22.1).

Rcg = Kcg22 / (Pana-Paer) (22.1) where: Kcg22: constant Paer: phosphorus concentration in the aerobic tank 3 Pana: phosphorus concentration in the anaerobic tank 2 The amount of coagulant added is determined from the amount of inflow sewage. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2). The output of the adjuster 23 is
It is transmitted to the infusion pump 9 via 3a. This allows
In addition to the same effects as in Embodiments 14 and 18, even when the concentration of phosphorus in the influent sewage fluctuates, the substantial phosphorus intake can be accurately detected, so that the water flows out of the biological water treatment apparatus. This has the effect that the amount of phosphorus can be more reliably reduced.

Embodiment 23 FIG. In the twenty-second embodiment, the activity of the phosphorus accumulating bacteria in the biological reaction tank 1 of the biological water treatment apparatus is detected by a value obtained by subtracting the phosphorus concentration in the aerobic tank 3 from the phosphorus concentration in the anaerobic tank 2. Although the apparatus is constructed in the same manner as in the fifteenth, sixteenth or nineteenth and twentieth embodiments, the same effect can be obtained even if the apparatus is configured to detect the difference in the phosphorus content in the phosphorus accumulating bacterium and the oxidation-reduction potential. Play.

Embodiment 24 FIG. FIG. 17 shows the second embodiment.
It is a block diagram which shows the flocculant addition apparatus in the biological water treatment apparatus concerning No.4. In the figures, the same reference numerals as those in FIGS. 1 to 16 indicate the same or corresponding parts. In the present embodiment, as a means for detecting the phosphorus removing activity of microorganisms in the biological reaction tank 1, the biological reaction tank 1 is provided with a microorganism concentration meter.

Reference numeral 29 denotes a microbial densitometer attached to the biological reaction tank 1, and 23 denotes an adjuster for adjusting the amount of aggregating agent added in accordance with the value measured by the microbial densitometer 29, via a signal line 29a. The microorganism concentration meter 29 is connected to the infusion pump 9 via a signal line 23a. Reference numeral 10 denotes a flow meter attached to the pipe a, which is connected to the controller 23 via the signal line 10a. In the present embodiment, the positions of the microorganism concentration meter 29 and the flow meter 10 are not limited at all, as in the other embodiments.

Next, the operation will be described. The microorganism concentration in the biological reaction tank 1 is measured by the microorganism concentration meter 29, and the measured value is transmitted to the controller 23 via the signal line 29a. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a. The controller 23 first determines the coagulant injection rate according to the measurement value of the microorganism concentration meter 29. The coagulant injection rate is
For example, the calculation is performed according to the equation (24.1). Rcg = Kcg24 / Cbio (24.1) where: Kcg24: constant Cbio: concentration of microorganism in biological reaction tank 1

Next, the amount of coagulant to be added is determined from the above-mentioned injection rate and the above-mentioned inflow sewage amount. The amount of the coagulant added is output, for example, according to equation (14.2). The output of the controller 23, that is, the amount of the coagulant added, is transmitted to the infusion pump 9 via the signal line 23a. Thus, when the concentration of microorganisms in the biological reaction tank 1 is low, it is considered that the phosphorus removing activity of the activated sludge microorganisms is low, and the amount of the flocculant added is increased. Conversely, when the microorganism concentration is high, the phosphorus removal activity of the activated sludge microorganism is considered to be normal, and the amount of the flocculant added is reduced. That is, since the amount of the coagulant added can be appropriately adjusted according to the state of biological phosphorus removal, the effect of reliably reducing the amount of phosphorus flowing out from the biological water treatment apparatus is exhibited.

Embodiment 25 FIG. In the above-described Embodiment 24, the apparatus is configured to detect the phosphorus removing activity of microorganisms in the biological reaction tank 1 based on the concentration of microorganisms in the biological reaction tank 1. The same effect can be obtained even if the apparatus is configured to use the index.

The sludge order is obtained by the following equation. T1 = V × Cbio / Qin × Cbioin where T1: Sludge age V: Volume of biological reaction tank 1 Qin: Flow rate of flow into biological reaction tank 1 Cbioin: Concentration of microorganism in inflowing wastewater

Further, the sludge residence time is obtained by the following equation. T2 = V × Cbio / (Qdrw × Cbiodrw
+ Qout × Cbioout) Here, T2: Sludge retention time Qdrw: Excess sludge withdrawal amount Cbiodrw: Excess sludge concentration Qout: Treated water amount Cbioout: Microorganism concentration in treated water When both indicators are large, the index is held in the biological reaction tank 1. In contrast, when the value is small, it indicates that the amount of microorganisms held in the biological reaction tank 1 is small. Therefore, it can be operated in the same manner as the microorganism concentration used in the twenty-fourth embodiment. .

Embodiment 26 FIG. FIG. 18 shows Embodiment 26
It is a lineblock diagram showing a flocculant addition device in a biological water treatment device concerning. In the drawings, the same reference numerals as those in FIGS. 1 to 17 indicate the same or corresponding parts. In the present embodiment, a flow meter for measuring the amount of inflow sewage is provided as a means for detecting the properties of the water to be treated that affects the phosphorus removal activity.

Reference numeral 10 denotes a flow meter attached to the pipe a, 2
Reference numeral 3 denotes a controller for adjusting the amount of the coagulant added in accordance with the measurement value of the flow meter 10, which is connected to the flow meter 10 via a signal line 10a and the injection pump 9 via a signal line 23a. I have. In the present embodiment, the position of the flow meter 10 is not limited at all, as in the other embodiments.

Next, the operation will be described. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and the signal line 10
is transmitted to the controller 23 via a. In the controller 23,
First, the coagulant injection rate is determined according to the measurement value of the flow meter. The coagulant injection rate is calculated, for example, according to equation (26.1). Rcg = Kcg26 × Qin (26.1) Here, Kcg26: constant Qin: inflow sewage amount Next, the coagulant addition amount is determined from the injection rate and the inflow sewage amount. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2).

The output of the controller 23, that is, the added amount of the flocculant is transmitted to the infusion pump 9 via the signal line 23a.
Thereby, when the amount of sewage flowing into the biological reaction tank 1 is large,
Assuming that rainwater containing dissolved oxygen is flowing, that is, the phosphorus removal activity of the activated sludge microorganisms is reduced, the amount of the coagulant added is increased. Conversely, when the amount of sewage flowing into the biological reaction tank 1 is small, it is considered that there is no inflow of rainwater and the phosphorus removal activity of the activated sludge microorganisms is normal, and the amount of the coagulant added is reduced. That is, since the amount of the coagulant added can be appropriately adjusted according to the state of biological phosphorus removal, the effect of reliably reducing the amount of phosphorus flowing out from the biological water treatment apparatus is exhibited.

Embodiment 27 FIG. FIG. 19 shows Embodiment 27
It is a lineblock diagram showing a flocculant addition device in a biological water treatment device concerning. In the figures, the same reference numerals as those in FIGS. 1 to 18 indicate the same or corresponding parts. In the present embodiment, a means for detecting the properties of the water to be treated that affects the phosphorus removal activity is provided with a dissolved oxygen concentration meter that measures the dissolved oxygen concentration in the inflow sewage. Reference numeral 30 denotes a dissolved oxygen concentration meter attached to the pipe a, and reference numeral 10 denotes a flow meter similarly attached to the pipe a.

Reference numeral 23 denotes a controller for adjusting the amount of the coagulant added in accordance with the value measured by the flow meter 10.
a, the flow meter 10 is connected via a signal line 10a, and the infusion pump 9 is connected via a signal line 23a. In this embodiment, the positions of the dissolved oxygen concentration meter 30 and the flow meter 10 are not limited at all, as in the other embodiments.

Next, the operation will be described. The dissolved oxygen concentration in the incoming sewage is measured by the dissolved oxygen concentration meter 30 and transmitted to the controller 23 via the signal line 30a. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a. Controller 23
First, the coagulant injection rate is determined according to the measurement value of the dissolved oxygen concentration meter 30. The coagulant injection rate is calculated, for example, according to equation (27.1). Rcg = Kcg27 × CDOin (27.1) where: Kcg27: constant CDOin: dissolved oxygen concentration in influent wastewater

Next, the coagulant addition amount is determined from the above-mentioned injection rate and the above-mentioned inflow sewage amount. The amount of the coagulant added is output, for example, according to equation (14.2). The output of the controller 23, that is, the amount of the coagulant added, is transmitted to the infusion pump 9 via the signal line 23a. Thus, when the dissolved oxygen concentration in the inflowing sewage is high, it is considered that the phosphorus discharge in the anaerobic tank 2 is delayed and the phosphorus removing activity is reduced, and the amount of the coagulant added is increased. Conversely, when the dissolved oxygen concentration in the inflowing sewage is low, the phosphorus removal activity is considered to be normal and the amount of the flocculant added is reduced. That is, since the amount of the coagulant added can be appropriately adjusted according to the state of biological phosphorus removal, the effect of reliably reducing the amount of phosphorus flowing out from the biological water treatment apparatus is exhibited.

Embodiment 28 FIG. FIG. 20 shows Embodiment 2
It is a block diagram which shows the coagulant addition apparatus in the biological water treatment apparatus concerning No. 8. In the drawings, the same reference numerals as those in FIGS. 1 to 19 indicate the same or corresponding parts. In the present embodiment, an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of inflow sewage is provided as means for detecting the properties of the water to be treated that affects the phosphorus removal activity.

Reference numeral 31 denotes an oxidation-reduction potentiometer attached to the pipe a, and reference numeral 10 denotes a flow meter similarly attached to the pipe a. 23 is a controller for adjusting the amount of the coagulant to be added in accordance with the values measured by the redox potentiometer 31 and the flow meter 10.
And the flow meter 10 via the signal line 10a and the signal line 23a
And is connected to the infusion pump 9 via. In this embodiment, the positions of the oxidation-reduction potentiometer 31 and the flow meter 10 are not limited at all, as in the other embodiments.

Next, the operation will be described. The oxidation-reduction potential of the incoming sewage is measured by the oxidation-reduction potentiometer 31 and transmitted to the controller 23 via the signal line 31a. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a. In the controller 23, first, according to the measurement value of the oxidation-reduction potentiometer 31,
Determine the flocculant injection rate. The coagulant injection rate is calculated, for example, according to equation (28.1).

Rcg = Kcg28 × Vin (28.1) Here, Kcg28: constant Vin: oxidation-reduction potential of inflowing sewage Next, the amount of coagulant added is determined from the above injection rate and the amount of inflowing sewage. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2). The output of the controller 23, that is, the amount of the coagulant added, is transmitted to the infusion pump 9 via the signal line 23a.

Accordingly, when the oxidation-reduction potential of the inflowing sewage is high, it is considered that the phosphorus discharge in the anaerobic tank 2 is delayed and the phosphorus removing activity is reduced, and the amount of the coagulant added is increased. Conversely, when the oxidation-reduction potential in the inflowing water is low, the phosphorus removal activity is considered to be normal and the amount of the flocculant added is reduced. That is,
Since the amount of the flocculant to be added can be appropriately adjusted according to the state of biological phosphorus removal, there is an effect that the amount of phosphorus flowing out from the biological water treatment apparatus can be surely reduced.

Embodiment 29 FIG. Embodiments 14 and 2 above
In Embodiment 8, as in Embodiments 6 and 7, a storage circuit for accumulating measured values may be provided, and the apparatus may be configured to estimate the activity of the phosphorus storage bacteria using these data. In this case, even when a long time is required for the analysis of phosphorus and the like, the necessary amount of the flocculant can be obtained in consideration of the fluctuation during this time. Therefore, in addition to the effects of Embodiments 14 to 28,
This has the effect that the amount of phosphorus flowing out of the biological water treatment device can be more reliably reduced.

Embodiment 30 FIG. FIG. 21 shows Embodiment 3
It is a block diagram which shows the flocculant addition apparatus in the biological water treatment apparatus concerning No. 0. 21, the same reference numerals as those in FIGS. 1 to 20 denote the same or corresponding parts. In the present embodiment, the apparatus is configured such that the amount of the coagulant added is adjusted according to the set value of the aeration amount of the biological water treatment apparatus.

Reference numeral 32 denotes a setting device for setting the amount of aeration of the aeration apparatus 4, which is connected to the aeration apparatus 4 via a signal line 32a. Numeral 23 denotes an adjuster for adjusting the amount of coagulant added in accordance with the set value of the amount of aeration to the aerobic tank 3, and the setter 32 for the amount of aeration via the signal line 32b and the signal line 23a.
And is connected to the infusion pump 9 via. Reference numeral 10 denotes a flow meter attached to the pipe a, which is connected to the controller 23 via the signal line 10a. In this embodiment, the position of the flow meter 10 is not limited at all, as in the other embodiments.

Next, the operation will be described. Aeration device 4
Is set in the setting device 32, and the set value is set in the signal line 32.
The signal is transmitted to the controller 23 via b. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and
is transmitted to the controller 23 via a. In the controller 23,
First, the coagulant injection rate is determined according to the set value of the aeration amount.

The coagulant injection rate is calculated, for example, according to the equation (30.1). Rcg = Kcg30 / Qair (30.1) Here, Kcg30: constant Qair: aeration amount Next, the coagulant addition amount is determined from the injection rate and the inflow sewage amount. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2).

The output of the controller 23 is transmitted to the infusion pump 9 via the signal line 23a. Thus, when the amount of aeration is small, the amount of phosphorus removed biologically is considered to be small, and the amount of the coagulant added is increased. Conversely, when the amount of aeration is large, it is considered that the amount of phosphorus removed biologically is large,
Reduce the amount of flocculant added. That is, since the amount of the flocculant to be added can be appropriately adjusted according to the operation parameters of the biological water treatment apparatus, there is an effect that the amount of phosphorus flowing out of the biological water treatment apparatus can be reliably reduced.

Embodiment 31 FIG. In Embodiment 30, the apparatus is configured to adjust the amount of coagulant added according to the set value of the aeration amount of the biological water treatment apparatus. However, the ratio of the aeration amount to the inflow sewage amount, that is, the air supply magnification The same effect can be obtained by configuring the apparatus so as to adjust the amount of the coagulant added in accordance with the set value of. In this case, as the air supply magnification increases, the amount of the coagulant added increases.

Embodiment 32 FIG. In Embodiment 30, the apparatus is configured to adjust the coagulant addition amount according to the set value of the aeration amount of the biological water treatment apparatus, but the coagulant addition amount is adjusted according to the measured value of the aeration amount. The same effect can be obtained even if the device is configured to adjust. In this case, a signal is taken out from the flow meter attached to the aerator or the pipe connecting the aerator and the diffuser, and used for calculating the amount of the coagulant added.

Embodiment 33 FIG. FIG. 22 shows Embodiment 3
It is a block diagram which shows the flocculant addition apparatus in the biological water treatment apparatus concerning No.3. In the drawings, the same reference numerals as those in FIGS. 1 to 21 indicate the same or corresponding parts. In the present embodiment, the apparatus is configured such that the amount of the coagulant added is adjusted according to the set value of the amount of returned sludge of the biological water treatment apparatus.

Reference numeral 33 denotes a setting device for setting the flow rate of the return sludge pump, which is connected to the return sludge pump 7 via a signal line 33a. 23 is a controller for adjusting the amount of coagulant added in accordance with the set value of the amount of returned sludge, and is connected to the setter 33 via a signal line 33b and the injection pump 9 via a signal line 23a. . Reference numeral 10 denotes a flow meter attached to the pipe a, which is connected to the controller 23 via the signal line 10a. In this embodiment, the position of the flow meter 10 is not limited at all, as in the other embodiments.

Next, the operation will be described. The returned sludge amount is set in the setting device 33. The set value is transmitted to the controller 23 via the signal line 33b. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a. The controller 23 first determines the coagulant injection rate according to the set value of the returned sludge amount. The coagulant injection rate is calculated, for example, according to equation (33.1). Rcg = Kcg33 × Qret (33.1) Here, Kcg33: constant Qret: amount of returned sludge Next, the amount of coagulant added is determined from the above injection rate and the amount of inflowing sewage. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2).

The output of the controller 23 is transmitted to the infusion pump 9 via the signal line 23a. Thus, when the amount of returned sludge is large, the amount of phosphorus discharged from the anaerobic tank 2 due to the return of the oxidizing substance generated in the aerobic tank 3 decreases, that is, the amount of biologically removed phosphorus decreases. Consider increasing the amount of coagulant added. Conversely, when the amount of returned sludge is small,
Assuming that the amount of phosphorus that is biologically removed increases,
Reduce the amount of flocculant added. That is, since the amount of the coagulant added can be appropriately adjusted according to the operation parameters of the biological water treatment apparatus, the effect of reliably reducing the amount of phosphorus flowing out can be achieved.

Embodiment 34 FIG. In Embodiment 33 described above, the apparatus is configured to adjust the amount of flocculant added in accordance with the set value of the amount of returned sludge of the biological water treatment apparatus. However, the ratio of the amount of returned sludge to the amount of inflow sewage, that is, The same effect can be obtained by configuring the apparatus to adjust the amount of the flocculant added according to the set value of the ratio.

Embodiment 35 FIG. Also, in Embodiment 33
In the above, the apparatus is configured to adjust the coagulant addition amount according to the set value of the returned sludge amount of the biological water treatment apparatus, but the coagulant addition amount is adjusted according to the actually measured value of the returned sludge amount. The same effect can be obtained even if the apparatus is configured as described above. In this case, a signal is taken out from the return sludge pump 7 or a flow meter attached to the pipe f, and used for calculating the amount of coagulant added.

Embodiment 36 FIG. FIG. 23 shows Embodiment 3
It is a block diagram which shows the flocculant addition apparatus in the biological water treatment apparatus concerning No. 6. In the drawings, the same reference numerals as those in FIGS. 1 to 22 indicate the same or corresponding parts. In the present embodiment, the apparatus is configured such that the amount of the coagulant added is adjusted according to the set value of the amount of excess sludge drawn out of the biological water treatment apparatus.

Numeral 34 denotes a setting device for setting the excess sludge withdrawal amount, which is connected to the withdrawal pump 6 via a signal line 34a. Reference numeral 23 denotes an adjuster for adjusting the amount of the flocculant to be added according to the amount of excess sludge drawn out, and is connected to the setting device 34 via a signal line 34b and to the injection pump 9 via a signal line 23a. Reference numeral 10 denotes a flow meter attached to the pipe a, and a controller 23 through a signal line 10a.
Is connected to

Next, the operation will be described. The excess sludge withdrawal amount is set in the setting unit 34. Set value is signal line 3
The signal is transmitted to the controller 23 via 4b. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10,
0a is transmitted to the controller 23. In the controller 23, first, according to the set value of the excess sludge withdrawal amount,
Determine the flocculant injection rate. The coagulant injection rate is calculated, for example, according to equation (36.1).

Rcg = Kcg36 × Qdrw (36.1) Here, Kcg36: constant Qdrw: excess sludge withdrawal amount Next, the coagulant addition amount is determined from the above injection rate and the above inflowing sewage amount. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2). The output of the adjuster 23 is
It is transmitted to the infusion pump 9 via 3a.

Thus, when the excess sludge withdrawal amount is large, the amount of coagulant added is increased, assuming that the amount of living organisms held in the apparatus is small and the amount of phosphorus that is biologically removed is small. Conversely, when the excess sludge withdrawal amount is small, it is considered that the amount of biomass retained in the apparatus is large and the amount of phosphorus that is biologically removed is large, and the amount of coagulant added is reduced. That is, since the amount of the coagulant added can be appropriately adjusted according to the operation parameters of the biological water treatment apparatus, the effect of reliably reducing the amount of phosphorus flowing out can be achieved.

Embodiment 37 FIG. In Embodiment 36, the apparatus is configured to adjust the amount of the flocculant added in accordance with the set value of the excess sludge withdrawal amount of the biological water treatment apparatus. However, the coagulation is performed in accordance with the actually measured value of the excess sludge withdrawal amount. The same effect can be obtained even if the apparatus is configured to adjust the amount of the agent added. In this case, a signal is taken out from the excess sludge extraction pump 6 or a flow meter attached to the pipe e, and is used for calculating the amount of coagulant added.

Embodiment 38 FIG. FIG. 24 shows Embodiment 3
It is a block diagram which shows the coagulant addition apparatus in the biological water treatment apparatus concerning No. 8. In the drawings, the same reference numerals as those in FIGS. 1 to 23 indicate the same or corresponding parts. In the present embodiment, the apparatus is configured such that the amount of coagulant added is adjusted according to the amount of aeration of the biological water treatment apparatus, the amount of returned sludge, and the amount of excess sludge withdrawn.

Numeral 35 denotes a setting device for setting each of the above set values. The setting device 35 includes an aeration device 4 via a signal line 35a, a return sludge pump 7 via a signal line 35b, and a drawing pump via a signal line 35c. 6 is connected. Reference numeral 23 denotes an adjuster for adjusting the amount of the coagulant added in accordance with each of the set values, and the adjuster 3 is provided via signal lines 35d, 35e, and 35f.
5 and the infusion pump 9 via a signal line 23a. Reference numeral 10 denotes a flow meter attached to the pipe a, which is connected to the controller 23 via the signal line 10a.

Next, the operation will be described. The set values are set in the setting unit 35, and the signal lines 35d, 35e, 3
The signal is transmitted to the controller 23 via 5f. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10,
0a is transmitted to the controller 23. The controller 23 first determines the coagulant injection rate according to the aeration amount, the returned sludge amount, and the excess sludge withdrawal amount. The coagulant injection rate is output, for example, according to equation (38.1). Rcg = Kcg381 / Qair + Kcg382 × Qret + Kcg383 × Qdrw (38.1) where Kcg381: constant Kcg382: constant Kcg383: constant

Next, the coagulant addition amount is determined from the above injection rate and the above inflow water amount. The amount of the coagulant added is output, for example, according to equation (14.2). The output of the controller 23 is
The signal is transmitted to the infusion pump 9 via the signal line 23a. Accordingly, in addition to the same effects as those of Embodiments 30 to 37, there is an effect that the added amount of the flocculant can be more appropriately adjusted according to the operation parameters of the biological water treatment apparatus. In the above description, the injection rate is determined according to the three components of the aeration amount, the returned sludge amount and the excess sludge withdrawal amount. However, the injection rate is determined according to the combination of two of the three components. Alternatively, the injection rate may be determined according to single information.

Embodiment 39 FIG. FIG. 25 shows Embodiment 3
It is a block diagram which shows the coagulant addition apparatus in the biological water treatment apparatus concerning No.9. In the drawings, the same reference numerals as those in FIGS. 1 to 24 indicate the same or corresponding parts. In the present embodiment, the apparatus is configured such that the amount of the coagulant added is adjusted according to the aeration amount of the biological water treatment apparatus and the oxidation-reduction potential of the anaerobic tank 2.

Reference numeral 23 denotes a controller for adjusting the amount of aggregating agent added in accordance with the amount of aeration to the aerobic tank 3 and the oxidation-reduction potential of the anaerobic tank 2, and a setter 32 for the amount of aeration via a signal line 32b.
And the oxidation-reduction potentiometer 25 via a signal line 25a, and the infusion pump 9 via a signal line 23a. 10
Is a flow meter attached to the pipe a, and the signal line 10a
Is connected to the controller 23 via the.

Next, the operation will be described. Setting device 32
Is set via the signal line 32b.
Conveyed to. The oxidation-reduction potential of the anaerobic tank 2 is transmitted to the controller 23 via the signal line 25a. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10 and transmitted to the controller 23 via the signal line 10a. Controller 23
First, according to the aeration amount and the oxidation-reduction potential,
Determine the flocculant injection rate. The coagulant injection rate is output according to, for example, equations (39.1) and (39.2).

Rcg = Kcg391 / Qair (Vana <Vana1) (39.1) Rcg = Kcg392 × Qair (Vana> Vana2) (39.2) where Kcg391: constant Kcg392: constant Qair: aeration tank Vana Redox potential Vana1: Reference value of oxidation-reduction potential Vana2: Reference value of oxidation-reduction potential Next, the coagulant addition amount is determined from the above injection rate and the above-mentioned inflow sewage amount. The amount of the coagulant added is determined, for example, by the formula (14.
Output according to 2).

The output of the controller 23 is transmitted to the infusion pump 9 via the signal line 23a. That is, when the oxidation-reduction potential of the anaerobic tank 2 is lower than a predetermined reference value, it is considered that phosphorus intake in the aerobic tank 3 is insufficient, and the equation (3)
Adjust the amount of flocculant added according to 9.1). Conversely, when the oxidation-reduction potential of the anaerobic tank 2 is higher than a predetermined reference value, it is considered that the anaerobic tank 2 is insufficiently discharging phosphorus, and
The amount of the flocculant added is adjusted according to the formula (39.2). Therefore, in addition to the same effects as in the thirty-third embodiment, there is an effect that the amount of the coagulant added can be more appropriately adjusted according to the amount of aeration to the biological water treatment apparatus.

In the above description, the apparatus is configured to change the calculation formula of the coagulant addition amount with respect to the aeration amount according to the oxidation-reduction potential of the anaerobic tank 2. Even if the apparatus is configured to change the calculation formula of the coagulant addition amount with respect to the sludge withdrawal amount,
A similar effect is achieved.

In the above description, the apparatus is configured to change the formula for calculating the amount of coagulant added according to the oxidation-reduction potential of the anaerobic tank 2. The same effect can be obtained even if the apparatus is configured to change the calculation formula.

In the above description, the apparatus is configured to change the formula for calculating the amount of the aggregating agent to be added according to the oxidation-reduction potential. However, the phosphorus concentration in the anaerobic tank or the aerobic tank, the phosphorus content in the phosphorus-accumulating bacteria, and the like. The same effect can be obtained even if the apparatus is configured to change the calculation formula of the added amount of the flocculant by the above method.

Embodiment 40 FIG. Embodiments 30 to 3 above
In No. 9, the apparatus was configured to adjust the coagulant addition amount according to the operating parameters of the biological water treatment apparatus by the anaerobic aerobic activated sludge method, but the same applies to other biological water treatment apparatuses. It is of course possible to configure the apparatus so as to adjust the amount of the coagulant added.

Embodiment 41 FIG. FIG. 26 shows Embodiment 41
It is a lineblock diagram showing a flocculant addition device in a biological water treatment device concerning. In the drawings, the same reference numerals as those in FIGS. 1 to 25 indicate the same or corresponding parts. In this embodiment, as means for detecting a decrease in the phosphorus removing activity of the activated sludge microorganisms, a phosphorus concentration meter for measuring the phosphorus concentration in the anaerobic tank 2 is provided, and the start of the addition of the flocculant is instructed based on the measured value. The apparatus is configured as described above.

Reference numeral 36 denotes a controller for instructing the start of the addition of the flocculant.
Is connected to Reference numeral 22 denotes a phosphorus concentration meter for measuring the phosphorus concentration in the anaerobic tank 2, and 37 denotes a setting device for setting the lower limit of the phosphorus concentration in the anaerobic tank 2.
a, and is connected to the controller 36 via a signal line 37a. In this embodiment, the phosphorus concentration meter 22 is used.
The position of is not limited at all, and the phosphorus concentration meter 22 may be installed in another place and water may be collected from the anaerobic tank 2.

Next, the operation will be described. The phosphorus concentration in the anaerobic tank 2 is measured by the phosphorus concentration meter 22, and the measured value is transmitted to the controller 36 via the signal line 22a. In the controller 36, the measured value of the phosphorus concentration is
When the lower limit set at 7 is reached, a coagulant addition start signal is output. The lower limit value set in the setting device 37 is transmitted to the controller 36 via the signal line 37a. Also,
The coagulant addition start signal is transmitted to the infusion pump 9 via the signal line 36a.

As a result, the decrease in the discharge of phosphorus in the anaerobic tank 2, that is, the decrease in the biological phosphorus removing activity is automatically detected and the addition of the flocculant is started. It has the effect of being able to. Further, in the above description, as a means for detecting the activity of the phosphorus accumulating bacterium, the apparatus is configured to include the phosphorus concentration meter for measuring the phosphorus concentration in the anaerobic tank 2, but as shown in Embodiments 15 to 29. The same effect can be obtained even if the apparatus is provided with other detecting means, for example, a measuring device for measuring the phosphorus content in the phosphorus accumulating bacteria, an oxidation-reduction potentiometer, a microorganism concentration meter, and the like. In this case, when a phosphorus content measuring device and an oxidation-reduction potentiometer are used, an upper limit is set instead of the lower limit.

Embodiment 42 FIG. FIG. 27 shows Embodiment 42.
It is a lineblock diagram showing a flocculant addition device in a biological water treatment device concerning. In the drawings, the same reference numerals as those in FIGS. 1 to 26 indicate the same or corresponding parts. In the present embodiment, a flow meter for measuring the amount of sewage flowing into the biological reaction tank 1 is provided as means for detecting a change in the property of the water to be treated that affects the phosphorus removal activity of the activated sludge microorganisms. The apparatus is configured to instruct the start of the addition of the flocculant based on the above.

Numeral 38 denotes a controller for instructing the start of the addition of the coagulant, and the coagulant injection pump 9 via the signal line 38a.
Is connected to Reference numeral 10 denotes a flow meter attached to the pipe a, and reference numeral 39 denotes a setting device for setting an upper limit of the amount of inflow sewage, which is connected to the controller 38 via a signal line 10a and a signal line 39a, respectively. In this embodiment, the position of the flow meter 10 is not limited at all, as in the other embodiments.

Next, the operation will be described. The amount of sewage flowing into the biological reaction tank 1 is measured by the flow meter 10, and the measured value is transmitted to the controller 38 via the signal line 10a. The controller 38 outputs a coagulant addition start signal when the inflow sewage amount reaches the upper limit value set in the setter 39. The upper limit value set in the setting unit 39 is the signal line 39a
To the controller 38. The coagulant addition start signal is transmitted to the infusion pump 9 via the signal line 38a. This automatically detects the decrease in the biological phosphorus removing activity due to the inflow of rainwater and starts adding the coagulant, so that the coagulant can be added efficiently.

Embodiment 43 FIG. Embodiments 41 and 4 above
In 2, the apparatus is configured to transmit the coagulant addition start signal to the infusion pump 9, but the apparatus may be configured to transmit the coagulant addition amount controller described in Embodiments 1 to 40, A similar effect is achieved.

As in the twenty-ninth embodiment, a storage circuit for storing the measured values may be provided, and the apparatus may be configured to estimate the activity of the phosphorus storage bacteria using these data. In this case, even when a long time is required for the analysis of phosphorus, the activity of the phosphorus accumulating bacteria can be estimated in consideration of the fluctuation during the period. Therefore, in addition to the effects of the embodiments 41 and 42, the addition of the flocculant is more effective. It has the effect of being able to start properly.

Embodiment 44. FIG. FIG. 28 shows Embodiment 4.
It is a block diagram which shows the flocculant addition apparatus in the biological water treatment apparatus concerning No.4. In the drawings, the same reference numerals as those in FIGS. 1 to 27 indicate the same or corresponding parts. In the present embodiment, the apparatus is configured to instruct the start of the addition of the flocculant when the aeration amount of the biological water treatment apparatus reaches the upper limit or the lower limit.

Numeral 40 denotes a controller for instructing the start of the addition of the coagulant, and the coagulant injection pump 9 via the signal line 40a.
Is connected to Reference numeral 32 denotes a setting device for setting the amount of aeration of the aeration apparatus 4, which is connected to the aeration apparatus 4 via a signal line 32a and to the controller 40 via a signal line 32b. Reference numeral 41 denotes a setting device for setting an upper limit value or a lower limit value of the aeration amount, and is connected to the controller 40 via a signal line 41a.

Next, the operation will be described. Setting device 32
Is transmitted to the controller 40 through the signal line 32b. Controller 40
When the aeration amount reaches the upper limit value or the lower limit value set in the setting device 41, a coagulant addition start signal is output.
The upper limit value or the lower limit value set in the setting device 41 is transmitted to the controller 40 via the signal line 41a. Also,
The coagulant addition start signal is transmitted to the infusion pump 9 via the signal line 40a. As a result, the addition of the flocculant can be started automatically by detecting that the biological phosphorus removing effect cannot be improved even if the aeration amount is adjusted, so that the flocculant can be added efficiently. .

In the above description, the apparatus is configured to instruct the start of the addition of the flocculant from the set value of the aeration amount as the operating parameter of the biological water treatment apparatus.
As shown in 1, 33, 34, 36, and 38, the apparatus may be configured to detect other operation parameters, for example, return sludge amount, excess sludge withdrawal amount, and instruct the start of coagulant addition. The same effect is achieved. Further, the biological water treatment apparatus is not limited to the anaerobic aerobic activated sludge method.

[0203] Similar effects can be obtained even if the apparatus is configured to detect operating parameters using a measuring instrument as shown in the embodiments 32, 35 and 37.

Further, in the above embodiment, the apparatus is configured to transmit the coagulant addition start signal to the infusion pump 9, but is transmitted to the coagulant addition amount controllers described in Embodiments 1 to 31. The same effect can be obtained by configuring the apparatus as described above.

Embodiment 45 FIG. Embodiments 1-4
Can also be applied to an acetic acid addition device. That is, only the chemical addition position is the anaerobic tank, and the same device configuration, operation, and effects can be obtained.

Further, in each of the above-described embodiments, an example in which a time-continuous analog type is used has been described. It has the same effect as.

Further, in each of the above embodiments, the case where the control circuit is configured has been described. However, even if the control circuit is programmed and mounted in a computer, the same effects as in the above embodiment can be obtained.

Further, in each of the above embodiments, an example is shown in which the control circuit is configured as a closed loop. However, the control circuit may be configured as a driving support system for indicating a control target value to an operator.

[0209]

According to the biological water treatment apparatus according to claim 1 of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical,
Means for detecting the amount of phosphorus flowing into the biological reaction tank, means for setting a target value of the amount of phosphorus flowing out of the biological reaction tank, and adjusting the amount of drug added according to the difference between the amount of phosphorus flowing in and the target value Means that the required amount of chemicals can be added quickly even if the amount of water to be treated or the phosphorus concentration fluctuates, and the amount of phosphorus flowing out of the biological water treatment device is reliably reduced. can do.

[0210] According to the biological water treatment apparatus of the second aspect of the present invention, the means for estimating the amount of phosphorus flowing into the chemical addition position and the target value of the amount of phosphorus flowing out of the biological reaction tank are set. And means for adjusting the amount of drug added in accordance with the difference between the amount of inflowing phosphorus and the target value, so that even if the distribution of phosphorus concentration exists in the biological reaction tank,
It is possible to accurately estimate the amount of phosphorus flowing into the drug addition position.

[0211] According to the biological water treatment apparatus of the third aspect of the present invention, the mixing water is provided in the subsequent step of the biological reaction tank into which sewage flows, and the biological water is provided with a means for adding a chemical. A processing apparatus, which includes means for detecting the amount of phosphorus flowing into the mixing pond, means for setting a target value of the amount of phosphorus flowing out of the biological reaction tank, and a method for determining a difference between the amount of phosphorus flowing in and the target value. Since the means for adjusting the amount of drug added is provided, the amount of phosphorus flowing out of the biological water treatment apparatus can be reliably reduced.

According to the biological water treatment apparatus of the fourth aspect of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical. Means for detecting the amount of phosphorus flowing out of the tank, means for setting a target value of the amount of phosphorus flowing out of the biological reaction tank, and means for adjusting the amount of drug added according to the difference between the amount of phosphorus flowing out and the target value The amount of phosphorus flowing out of the biological water treatment apparatus can be reliably reduced.

According to the biological water treatment apparatus of the fifth aspect of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical. Means for detecting the amount of phosphorus flowing into the tank, means for detecting the amount of phosphorus flowing out of the biological reaction tank, means for setting a target value of the amount of phosphorus flowing out of the biological reaction tank, A means is provided for adjusting the amount of chemical added in accordance with the difference between the target value and the difference between the amount of discharged phosphorus and the target value. Not only can the agent be added as soon as possible, but also the amount added can be adjusted without excess or deficiency based on the phosphorus concentration of the treated water.

According to the biological water treatment apparatus according to claim 6 of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical. Means for measuring the amount of water, means for measuring the phosphorus concentration in the biological reaction tank, and means for determining the injection rate from the phosphorus concentration and adjusting the amount of the drug added based on the injection rate and the amount of inflowing sewage are provided. The amount of drug added can be appropriately adjusted according to the situation of target phosphorus removal.

According to the biological water treatment apparatus according to claim 7 of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical. Means for measuring the amount of water, means for measuring the phosphorus content in the phosphorus accumulating bacteria in the biological reaction tank, means for determining the injection rate from the phosphorus content, and means for adjusting the amount of drug addition based on the injection rate and the amount of sewage inflow. , The amount of drug added can be appropriately adjusted according to the situation of biological phosphorus removal.

According to the biological water treatment apparatus according to the eighth aspect of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical. Since the means for measuring the amount of water, the means for measuring the oxidation-reduction potential in the biological reaction tank, the injection rate is determined from the oxidation-reduction potential, and the means for adjusting the amount of drug added by this injection rate and the amount of inflowing sewage are provided, The amount of drug added can be appropriately adjusted according to the situation of biological phosphorus removal.

According to the biological water treatment apparatus according to the ninth aspect of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical. Means for measuring the amount of water, means for detecting the concentration of phosphorus in the influent sewage, means for measuring the concentration of phosphorus in the biological reaction tank, and the injection rate based on the difference between the concentration of phosphorus in the influent sewage and the concentration of phosphorus in the biological reaction tank And the means for adjusting the amount of drug added by this injection rate and the amount of inflow sewage was provided.
Even when the concentration of phosphorus in the incoming sewage fluctuates, the actual amount of discharged phosphorus can be accurately detected.

According to the biological water treatment apparatus according to claim 10 of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical,
Means for measuring inflow sewage, means for measuring phosphorus concentration in anaerobic tanks of biological reaction tanks, means for measuring phosphorus concentration in aerobic tanks, phosphorus concentration in anaerobic tanks and phosphorus concentration in aerobic tanks And the means for adjusting the amount of drug added based on the injection rate and the amount of inflow sewage is provided, so that even when the phosphorus concentration in the inflow sewage fluctuates, the actual phosphorus intake can be reduced. It can be detected accurately.

[0219] According to the biological water treatment apparatus according to claim 11 of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical,
Since the means for measuring the amount of inflow sewage, the means for measuring the concentration of microorganisms in the biological reaction tank, the injection rate is determined from the concentration of microorganisms, and means for adjusting the amount of drug added by this injection rate and the amount of inflow sewage are provided, The amount of drug added can be appropriately adjusted according to the situation of biological phosphorus removal.

According to the biological water treatment apparatus of the twelfth aspect of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical,
Means for measuring the amount of inflow sewage and means for determining the injection rate from the amount of inflow sewage and adjusting the amount of drug added based on the injection rate and the amount of inflow sewage are provided. The amount added can be adjusted appropriately.

According to the biological water treatment apparatus of the thirteenth aspect of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical,
Means for measuring the amount of inflow sewage, means for measuring the concentration of dissolved oxygen in the inflow sewage, and determining the injection rate from the concentration of dissolved oxygen,
Since the means for adjusting the amount of drug added is provided according to the injection rate and the amount of sewage inflow, the amount of drug added can be appropriately adjusted according to the state of biological phosphorus removal.

According to the biological water treatment apparatus of claim 14 of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical,
Means for measuring the amount of inflow sewage, means for measuring the oxidation-reduction potential in the inflow sewage, and finding the injection rate from the oxidation-reduction potential
Since the means for adjusting the amount of drug added is provided according to the injection rate and the amount of sewage inflow, the amount of drug added can be appropriately adjusted according to the state of biological phosphorus removal.

According to the biological water treatment apparatus of the fifteenth aspect of the present invention, the biological water treatment apparatus has a biological reaction tank into which sewage flows and an aeration device is attached, and a means for adding a chemical. A device for measuring an inflow sewage amount, and a means for determining an injection rate from an aeration amount by an aeration device, and adjusting a drug addition amount based on the injection rate and the inflow sewage amount. The amount of drug added can be appropriately adjusted according to the operation parameters of the processing device.

According to the biological water treatment apparatus of the sixteenth aspect of the present invention, a biological reaction tank into which sewage flows, a means for adding a chemical, and a sedimentation treatment for a mixed solution flowing out of the biological reaction tank. A biological water treatment apparatus having a sedimentation basin and means for returning the settled sludge to the biological reaction tank,
Means for measuring the amount of inflow sewage and means for determining the injection rate from the amount of sludge returned by the sludge return means, and means for adjusting the amount of added chemicals based on the injection rate and the amount of inflow sewage are provided. The drug addition amount can be appropriately adjusted according to the operation parameters.

According to the biological water treatment apparatus of the seventeenth aspect of the present invention, a biological reaction tank into which sewage flows, a means for adding a chemical, and a sedimentation treatment for a mixed solution flowing out of the biological reaction tank. A biological water treatment apparatus having a sedimentation basin and a means for extracting precipitated excess sludge, wherein the means for measuring the amount of inflow sewage and the amount of excess sludge withdrawn by the excess sludge withdrawing means are injected. Find the rate,
Since the means for adjusting the amount of drug added is provided according to the injection rate and the amount of inflowing sewage, the amount of drug added can be appropriately adjusted according to the operating parameters of the biological water treatment apparatus.

According to the biological water treatment apparatus of the eighteenth aspect of the present invention, a biological reaction tank into which sewage flows, a means for adding a chemical, an aeration apparatus attached to the biological reaction tank, A biological water treatment apparatus comprising: a sedimentation basin for performing a sedimentation treatment on a mixed solution flowing out of a tank; a means for returning the settled sludge to a biological reaction tank; and a means for extracting settled excess sludge. The means for measuring the amount of inflow sewage, the aeration amount by the aeration device, the amount of sludge returned by the sludge return means, and the excess sludge withdrawn by the excess sludge withdrawal means, and the injection rate is determined from at least one of the information on the amount of sludge withdrawal. Since the means for adjusting the amount of drug added is provided according to the injection rate and the amount of inflowing sewage, the amount of drug added can be appropriately adjusted according to the operating parameters of the biological water treatment apparatus.

According to the biological water treatment apparatus according to the nineteenth aspect of the present invention, the biological water treatment apparatus has a biological reaction tank into which sewage flows and an aeration device is attached, and a means for adding a chemical. An apparatus for measuring an inflow sewage amount, a redox potential in a biological reaction tank, a phosphorus concentration, a means for measuring any one of phosphorus contents in a phosphorus-accumulating bacterium, an oxidation-reduction potential, The injection rate is determined from one of the phosphorus concentration and the phosphorus content and the amount of aeration by the aeration device, and means for adjusting the amount of the drug added based on the injection rate and the amount of inflowing sewage are provided. The amount of drug added can be adjusted more appropriately according to the amount of aeration to the device.

According to the biological water treatment apparatus of the twentieth aspect of the present invention, a biological reaction tank into which sewage flows, a means for adding a chemical, and a sedimentation treatment for a mixed solution flowing out of the biological reaction tank. A biological water treatment apparatus having a sedimentation basin and means for returning the settled sludge to the biological reaction tank,
Means for measuring the amount of inflowing sewage, means for measuring any one of the oxidation-reduction potential, phosphorus concentration, and phosphorus content of the phosphorus-accumulating bacteria in the biological reaction tank, and oxidation-reduction potential, phosphorus concentration, and phosphorus content The injection rate is determined from any one of the amounts and the sludge amount returned by the sludge return means, and means for adjusting the amount of the chemical added according to the injection rate and the inflow sewage amount are provided. The amount of chemical added can be more appropriately adjusted according to the amount of returned sludge.

According to the biological water treatment apparatus of the twenty-first aspect of the present invention, a biological reaction tank into which sewage flows, a means for adding a chemical, and a sedimentation treatment for a mixed solution flowing out of the biological reaction tank. A biological water treatment apparatus having a sedimentation basin, and a means for extracting precipitated excess sludge, comprising: a means for measuring the amount of inflow sewage; an oxidation-reduction potential, a phosphorus concentration, and a phosphorus accumulation bacterium in a biological reaction tank. Means for measuring any one of the phosphorus contents in the medium, and the injection rate based on any one of the oxidation-reduction potential, phosphorus concentration and phosphorus content and the amount of excess sludge withdrawn by the excess sludge withdrawing means. Is provided, and means for adjusting the amount of drug added based on the injection rate and the amount of inflowing sewage are provided, so that the amount of drug added can be more appropriately adjusted according to the amount of excess sludge withdrawn from the biological water treatment apparatus.

According to the biological water treatment apparatus of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical,
Means for measuring the amount of inflow sewage, means for setting the upper limit of the amount of inflow sewage, and means for outputting a chemical addition start signal when the amount of inflow sewage reaches the upper limit are provided. Since the addition of the drug is started by automatically detecting the decrease in the activity of removing the natural tan, the drug can be added efficiently.

According to the biological water treatment apparatus of the twenty-third aspect of the present invention, there is provided means for estimating a measured value at the time of adding a chemical based on each measured value flowing into the biological reaction tank or the mixing pond. Therefore, even when analysis of phosphorus or the like requires time, a necessary amount of the drug can be obtained in consideration of the fluctuation during this time.

According to the biological water treatment apparatus according to claim 24 of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical,
Means for measuring the phosphorus concentration in the anaerobic tank of the biological reaction tank, means for setting the lower limit of the phosphorus concentration, and means for outputting a drug addition start signal when the phosphorus concentration reaches the lower limit are provided. By automatically detecting a decrease in the discharge of phosphorus in the reaction tank, that is, a decrease in the biological phosphorus removing activity, and starting the addition of the drug, the drug can be efficiently added.

According to the biological water treatment apparatus according to claim 25 of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical,
A means for measuring the concentration of microorganisms in the anaerobic tank of the biological reaction tank, a means for setting the lower limit of the concentration of microorganisms, and a means for outputting a drug addition start signal when the concentration of microorganisms reach the lower limit are provided. A drug can be added to the mixture.

According to the biological water treatment apparatus according to claim 26 of the present invention, there is provided a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical,
Means for measuring the phosphorus content in the phosphorus accumulating bacteria in the anaerobic tank of the biological reaction tank, means for setting the upper limit of the phosphorus content, and outputting a drug addition start signal when the phosphorus content reaches the upper limit value With the provision of the means, the drug can be added efficiently.

According to the biological water treatment apparatus according to claim 27 of the present invention, it is a biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical,
Means for measuring an oxidation-reduction potential in an anaerobic tank of a biological reaction tank, means for setting an upper limit value of the oxidation-reduction potential, and means for outputting a drug addition start signal when the oxidation-reduction potential reaches the upper limit value are provided. Therefore, the drug can be added efficiently.

[0236] According to the biological water treatment apparatus according to claim 28 of the present invention, the biological water treatment apparatus having a biological reaction tank into which sewage flows and an aeration device is attached, and a means for adding a chemical. A device for setting an upper limit or a lower limit of the amount of aeration by the aeration device and a unit for outputting a drug addition start signal when the amount of aeration reaches the upper limit or the lower limit. A drug can be added to the mixture.

According to the biological water treatment apparatus according to claim 29 of the present invention, the biological reaction tank into which sewage flows, the means for adding a chemical, and the sedimentation treatment of the mixed solution flowing out of the biological reaction tank. A biological water treatment apparatus having a sedimentation basin and means for returning the settled sludge to the biological reaction tank,
A means for setting the upper limit or lower limit of the amount of returned sludge by the sludge return means and a means for outputting a chemical addition start signal when the amount of returned sludge reaches the upper limit or lower limit provide efficient chemical treatment. Can be added.

According to the biological water treatment apparatus of the thirtieth aspect of the present invention, the biological reaction tank into which the sewage flows, the means for adding the chemical, and the sedimentation treatment of the mixed solution flowing out from the biological reaction tank. A settling tank, and a biological water treatment apparatus having a means for extracting precipitated excess sludge, and a means for setting an upper limit or a lower limit of the amount of excess sludge withdrawn by the excess sludge withdrawing means; Since a means for outputting a chemical addition start signal when the excess sludge withdrawal amount reaches the upper limit value or the lower limit value is provided, the chemical can be added efficiently.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 2 of the present invention.

FIG. 3 is a configuration diagram illustrating a coagulant adding device in a biological water treatment apparatus according to Embodiment 3 of the present invention.

FIG. 4 is a configuration diagram showing a flocculant adding device in a biological water treatment apparatus according to Embodiment 5 of the present invention.

FIG. 5 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 6 of the present invention.

FIG. 6 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 9 of the present invention.

FIG. 7 is a configuration diagram showing a flocculant adding device in a biological water treatment apparatus according to Embodiment 10 of the present invention.

FIG. 8 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 14 of the present invention.

FIG. 9 is a configuration diagram showing a flocculant adding device in a biological water treatment apparatus according to Embodiment 15 of the present invention.

FIG. 10 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 16 of the present invention.

FIG. 11 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 17 of the present invention.

FIG. 12 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 18 of the present invention.

FIG. 13 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 19 of the present invention.

FIG. 14 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 20 of the present invention.

FIG. 15 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 21 of the present invention.

FIG. 16 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 22 of the present invention.

FIG. 17 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 24 of the present invention.

FIG. 18 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 26 of the present invention.

FIG. 19 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 27 of the present invention.

FIG. 20 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 28 of the present invention.

FIG. 21 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 30 of the present invention.

FIG. 22 is a configuration diagram showing a flocculant adding device in a biological water treatment apparatus according to Embodiment 33 of the present invention.

FIG. 23 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 36 of the present invention.

FIG. 24 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 38 of the present invention.

FIG. 25 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 39 of the present invention.

FIG. 26 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 41 of the present invention.

FIG. 27 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 42 of the present invention.

FIG. 28 is a configuration diagram showing a coagulant adding device in a biological water treatment apparatus according to Embodiment 44 of the present invention.

FIG. 29 is a configuration diagram showing a coagulant adding device in a conventional biological water treatment device.

[Explanation of symbols]

1 biological reaction tank, 2 anaerobic tank, 3 aerobic tank, 4 aeration device, 5 sedimentation tank, 6 excess sludge extraction pump, 7 return sludge pump, 10, 18, 20 flow meter, 11, 15,
17,21,22,26 phosphorus concentration meter, 14,23 regulator, 16 mixing pond, 24,27 phosphorus content measuring device, 2
5, 28, 31 redox potentiometer, 29 microorganism concentration meter, 30 dissolved oxygen concentration meter, 36, 38, 40 controller, 37, 39, 41 setting device.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Tokimori 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Co., Ltd. (72) Inventor Hiroshi Kimura 2-3-2 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Hiroshi Takasu 2-97-16 Daikindaira, Matsudo-shi, Chiba (72) Inventor Hatshiro Matsuda 4-2-4-704 Nagayama, Tama-shi, Tokyo

Claims (30)

[Claims] 1. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, a means for detecting an amount of phosphorus flowing into the biological reaction tank, and the biological reaction tank. Means for setting a target value of the amount of phosphorus flowing out of the system, and means for adjusting the amount of drug added in accordance with the difference between the amount of phosphorus flowing in and the target value. apparatus. 2. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein the means for estimating the amount of phosphorus flowing into a chemical addition position is provided. A biological water treatment apparatus comprising: means for setting a target value of the amount of phosphorus flowing out; and means for adjusting the amount of drug added in accordance with the difference between the amount of phosphorus flowing in and the target value. 3. A biological water treatment apparatus provided with a mixing pond in a subsequent step of a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein the amount of phosphorus flowing into the mixing pond is controlled. Means for detecting, means for setting a target value of the amount of phosphorus flowing out from the biological reaction tank, and means for adjusting the amount of drug added according to the difference between the amount of phosphorus flowing in and the target value are provided. A biological water treatment apparatus, characterized in that: 4. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a drug, a means for detecting an amount of phosphorus flowing out of the biological reaction tank,
A biological system comprising: means for setting a target value of the amount of phosphorus flowing out of the biological reaction tank; and means for adjusting the amount of drug added in accordance with the difference between the amount of phosphorus flowing out and the target value. Water treatment equipment. 5. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, a means for detecting an amount of phosphorus flowing into the biological reaction tank, and the biological reaction tank. Means for detecting the amount of phosphorus escaping from the
Means for setting a target value of the amount of phosphorus flowing out of the biological reaction tank; and a difference between the inflowing phosphorus amount and the target value, and a drug addition amount according to the difference between the outflowing phosphorus amount and the target value. A biological water treatment device, characterized in that the device comprises adjusting means. 6. A biological water treatment apparatus having a biological reaction tank into which sewage flows and a means for adding a drug, means for measuring the amount of inflow sewage, and means for measuring phosphorus concentration in the biological reaction tank. And a means for determining an injection rate from the phosphorus concentration and adjusting the amount of the drug added based on the injection rate and the amount of inflowing sewage. 7. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein a means for measuring the amount of sewage flowing into the biological reaction tank, and phosphorus contained in the phosphorus accumulating bacteria in the biological reaction tank. A biological water treatment apparatus comprising: means for measuring the content; and means for determining an injection rate from the phosphorus content and adjusting the amount of the drug added based on the injection rate and the amount of inflowing sewage. 8. A biological water treatment apparatus having a biological reaction tank into which sewage flows and a means for adding a chemical, wherein a means for measuring the amount of inflow sewage and an oxidation-reduction potential in the biological reaction tank are measured. A biological water treatment apparatus comprising: means for obtaining an injection rate from the oxidation-reduction potential; and means for adjusting a drug addition amount based on the injection rate and an inflow sewage amount. 9. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a chemical, wherein a means for measuring the amount of sewage flowing in, and a means for detecting a phosphorus concentration in the inflowing sewage. Means for measuring the phosphorus concentration in the biological reaction tank, and the injection rate is determined from the difference between the phosphorus concentration in the inflowing sewage and the phosphorus concentration in the biological reaction tank, and the amount of drug added is determined by the injection rate and the amount of inflowing sewage. A biological water treatment device, characterized in that the device comprises adjusting means. 10. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and means for adding a drug,
Means for measuring the amount of inflow sewage, means for measuring the phosphorus concentration in the anaerobic tank of the biological reaction tank, means for measuring the phosphorus concentration in the aerobic tank, phosphorus concentration in the anaerobic tank and the aerobic tank A biological water treatment apparatus comprising: a means for determining an injection rate from a difference between the phosphorus concentration and a means for adjusting a drug addition amount based on the injection rate and the amount of inflowing sewage. 11. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and means for adding a drug,
Means for measuring the amount of inflowing sewage, means for measuring the concentration of microorganisms in the biological reaction tank, and means for obtaining an injection rate from the concentration of microorganisms, and means for adjusting the amount of drug added by the injection rate and the amount of inflowing sewage were provided. A biological water treatment apparatus, characterized in that: 12. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and means for adding a drug,
A biological water treatment apparatus comprising: means for measuring the amount of inflowed sewage; and means for determining an injection rate from the amount of inflowed sewage, and adjusting the amount of drug added based on the injection rate and the amount of inflowed sewage. 13. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and means for adding a drug,
Means for measuring the amount of inflow sewage, means for measuring the concentration of dissolved oxygen in the inflow sewage, means for determining the injection rate from the dissolved oxygen concentration, and means for adjusting the amount of drug added by the injection rate and the amount of inflow sewage are provided. A biological water treatment apparatus. 14. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and a means for adding a drug,
Means for measuring the amount of inflow sewage, means for measuring the oxidation-reduction potential in the inflow sewage, means for determining the injection rate from the oxidation-reduction potential, and means for adjusting the amount of drug added by the injection rate and the amount of inflow sewage are provided. A biological water treatment apparatus. 15. A biological water treatment apparatus having a biological reaction tank into which sewage flows and an aeration device is attached, and a means for adding a drug, wherein a means for measuring the amount of inflow sewage is provided, and A biological water treatment apparatus comprising: a means for determining an injection rate from an aeration amount, and a means for adjusting a drug addition amount based on the injection rate and an inflow sewage amount. 16. A biological reaction tank into which sewage flows, means for adding a chemical, a sedimentation tank for precipitating a mixed solution flowing out of the biological reaction tank, and returning the settled sludge to the biological reaction tank. Means for measuring the amount of inflow sewage, and determining the injection rate from the amount of sludge returned by the sludge return means, and adjusting the amount of chemicals added by the injection rate and the amount of inflow sewage. A biological water treatment apparatus, comprising: 17. A biological reaction tank into which sewage flows, a means for adding a chemical, a sedimentation tank for precipitating a mixed solution flowing out of the biological reaction tank, and a means for extracting surplus sludge that has settled. In a biological water treatment apparatus having a means for measuring the amount of inflow sewage and an excess sludge withdrawal amount extracted by the excess sludge withdrawing means, an injection rate is obtained. A biological water treatment device, characterized in that the device comprises adjusting means. 18. A biological reaction tank into which sewage flows, a means for adding a chemical, an aeration device attached to the biological reaction tank, and a sedimentation pond for precipitating a mixed solution flowing out of the biological reaction tank. Means for returning the settled sludge to the biological reaction tank, and means for withdrawing the settled surplus sludge, a means for measuring the amount of inflow sewage, and aeration by the aerator. The injection rate is determined from at least one of the following: the amount of sludge returned by the sludge return means, and the excess sludge withdrawal amount extracted by the excess sludge withdrawal means, and the amount of chemical added is adjusted by the injection rate and the amount of inflowing sewage. A biological water treatment apparatus, comprising: 19. A biological water treatment apparatus having a biological reaction tank to which sewage flows and an aeration device is attached, and a means for adding a chemical, a means for measuring an amount of sewage flowing in, and the biological reaction tank. Means for measuring any one of the oxidation-reduction potential, phosphorus concentration and phosphorus content in the phosphorus-accumulating bacterium, and any one of the oxidation-reduction potential, phosphorus concentration and phosphorus content and the aeration apparatus A biological water treatment apparatus, comprising: a means for obtaining an injection rate from an aeration amount by means of the method and a means for adjusting the amount of the drug added according to the injection rate and the amount of inflowing sewage. 20. A biological reaction tank into which sewage flows, means for adding a chemical, a sedimentation tank for performing a settling treatment on a mixed solution flowing out of the biological reaction tank, and returning the settled sludge to the biological reaction tank. Means for measuring the amount of inflow sewage, and measuring any one of the oxidation-reduction potential, the phosphorus concentration, and the phosphorus content in the phosphorus-accumulating bacteria in the biological reaction tank. Means for measuring, and any one of the above redox potential, phosphorus concentration, and phosphorus content
A biological water treatment apparatus comprising: means for determining an injection rate from the amount of sludge returned by the sludge return means, and adjusting the amount of chemicals added based on the injection rate and the amount of inflowing sewage. 21. A biological reaction tank into which sewage flows, a means for adding a chemical, a sedimentation tank for performing a sedimentation treatment on a mixed solution flowing out of the biological reaction tank, and a means for pulling out excess sludge that has settled. Means for measuring the amount of inflow sewage, and means for measuring any one of the oxidation-reduction potential, phosphorus concentration, and phosphorus content in phosphorus-accumulating bacteria in the biological reaction tank. And an injection rate is determined from any one of the oxidation-reduction potential, the phosphorus concentration, and the phosphorus content, and the excess sludge withdrawal amount extracted by the excess sludge extraction means. A biological water treatment apparatus, comprising: 22. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and means for adding a drug,
Means for measuring the amount of inflow sewage, means for setting the upper limit of the amount of inflow sewage, and means for outputting a drug addition start signal when the amount of inflow sewage reaches the upper limit, Biological water treatment equipment. 23. The apparatus according to claim 1, further comprising means for estimating a measured value at the time of adding the drug based on each measured value flowing into the biological reaction tank or the mixing pond.
The biological water treatment apparatus according to any one of the above. 24. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and means for adding a drug,
Means for measuring the phosphorus concentration in the anaerobic tank of the biological reaction tank, means for setting the lower limit of the phosphorus concentration, and means for outputting a drug addition start signal when the phosphorus concentration reaches the lower limit are provided. A biological water treatment apparatus. 25. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and means for adding a chemical,
Means for measuring the concentration of microorganisms in the anaerobic tank of the biological reaction tank, means for setting the lower limit of the concentration of microorganisms, and means for outputting a drug addition start signal when the concentration of microorganisms reach the lower limit are provided. A biological water treatment apparatus. 26. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and means for adding a drug,
Means for measuring the phosphorus content in the phosphorus-accumulating bacteria in the anaerobic tank of the biological reaction tank, means for setting the upper limit of the phosphorus content, and start of drug addition when the phosphorus content reaches the upper limit. Means for outputting a signal. 27. A biological water treatment apparatus having a biological reaction tank into which sewage flows, and means for adding a drug,
Means for measuring an oxidation-reduction potential in an anaerobic tank of the biological reaction tank, means for setting an upper limit value of the oxidation-reduction potential, and means for outputting a drug addition start signal when the oxidation-reduction potential reaches the upper limit value And a biological water treatment apparatus characterized by comprising: 28. In a biological water treatment apparatus having a biological reaction tank into which sewage flows and an aeration device is attached, and a means for adding a chemical, an upper limit value or a lower limit value of the amount of aeration by the aeration device is set. A biological water treatment apparatus comprising: a setting unit; and a unit that outputs a drug addition start signal when the aeration amount reaches the upper limit value or the lower limit value. 29. A biological reaction tank into which sewage flows, a means for adding a chemical, a sedimentation tank for precipitating a mixed solution flowing out of the biological reaction tank, and returning the settled sludge to the biological reaction tank. Means for setting the upper limit or lower limit of the amount of sludge returned by the sludge return means, and adding a chemical when the amount of returned sludge reaches the upper limit or lower limit. Means for outputting a start signal. 30. A biological reaction tank into which sewage flows, a means for adding a chemical, a sedimentation tank for performing a sedimentation treatment on a mixed solution flowing out of the biological reaction tank, and a means for withdrawing the settled excess sludge. In the biological water treatment apparatus having the means for setting the upper limit or lower limit of the amount of excess sludge withdrawn extracted by the excess sludge withdrawing means, the excess sludge withdrawal amount has reached the upper limit or lower limit Means for outputting a drug addition start signal.