JPH1038876A - Concentration measuring device and suspension sampling unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly measure ammonia nitrogen concentration and oxidized nitrogen concentration. SOLUTION: A concentration measuring device has a suspension sampling unit 21 installed in suspension so as to take in suspension and to eliminate impurities from the suspension, a film filter unit 16 connected to the suspension sampling unit 21 by a suspension sampling pipe 24 so as to obtain a sample by separating suspended substance from the suspension fed through the suspension sampling pipe 24, and a concentration measuring unit 20 for measuring the nitrogen concentration of the sample obtained by the film filter unit 16. Since the impurities are eliminated from the suspension by the suspension sampling unit 21, a passage or the like for feeding the suspension to the film filter unit 16 is not blocked, nor is separating action of a film of the film filter unit hindered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concentration measuring device and a suspension sampling unit.

[0002]

2. Description of the Related Art Conventionally, for example, organic matter such as human waste and sewage,
When treating wastewater containing nitrogen or the like, a biological denitrification method may be used. The biological denitrification method comprises a nitrification step, a denitrification step, and the like. First, in the nitrification step, an aerobic atmosphere is formed in a wastewater, that is, a treatment tank containing a suspension. In an atmosphere, ammonia and other nitrogen components in the suspension are oxidized by the action of nitrifying bacteria, nitrifying bacteria, etc., to become nitrous acid, nitric acid, and the like.

[0003] In the next denitrification step, an anaerobic atmosphere is formed in the treatment tank, and in the anaerobic atmosphere, nitrous acid, nitric acid, etc., need an organic carbon source and are eutrophic. It is reduced to nitrogen gas by bacteria. by the way,
During the nitrification step and the denitrification step, the form of nitrogen in the suspension changes in the order of ammoniacal nitrogen, oxidized nitrogen and molecular nitrogen. Therefore, the ammonia nitrogen concentration and the oxidized nitrogen concentration of the suspension are measured by a concentration measuring device.

[0004] To this end, suspended substances in the suspension are separated by a membrane filtration unit to obtain a sample for measuring the ammonia nitrogen concentration and the oxidized nitrogen concentration. However, when the suspension is directly supplied to the membrane filtration unit, impurities in the suspension obstruct a flow path or the like for supplying the suspension to the membrane filtration unit. This hinders the separation action of the membrane.

Therefore, it is conceivable that the suspension discharged from the processing tank is supplied to a contaminant removing device to remove contaminants in the suspension. Generally, various types of contaminant removal devices are provided to remove contaminants in a suspension. In a scrape-type contaminant removal device, a contaminant captured by a screen is used. The object is scraped off by a scraping claw and discarded in a contaminant pit.

[0006] In addition, in the flow-through type impurity removing apparatus, the liquid to be removed (dropping liquid) is dropped from above the screen, and the impurity is captured by the screen. And the contaminants captured by the screen are:
It slides down on the surface of the screen and is discarded in a contaminant pit. Further, in the double-body rotating drum type foreign matter removing device, the suspension is poured into the rotating double-body rotating drum, and the foreign matter is captured by a screen disposed in the double-body rotating drum. I have to. The contaminants captured by the screen are disposed outside the double-drum rotary drum with the rotation of the double-drum rotary drum.

[0007]

However, the suspension discharged from the processing tank is supplied to a contaminant removing device, and the contaminant in the suspension is removed by the contaminant removing device.
In a concentration measuring device in which the suspension after the impurities are removed is further supplied to a membrane filtration unit to separate suspended substances in the suspension to obtain a sample, the ammonia in the obtained sample is When measuring the nitrogen concentration and oxidized nitrogen concentration,
The ammonia nitrogen concentration and the oxidized nitrogen concentration of the suspension in the treatment tank cannot be measured quickly. The present invention solves the problems of the conventional concentration measuring device, and a concentration measuring device and a suspension capable of quickly measuring the ammonia nitrogen concentration and the oxidized nitrogen concentration of a suspension in a treatment tank. It is intended to provide a sampling unit.

[0008]

For this purpose, in the concentration measuring apparatus according to the present invention, a suspension collecting unit is installed in the suspension to take in the suspension and remove impurities from the suspension. A membrane filtration unit that is connected to the suspension collection unit by a suspension collection tube, and separates a suspended substance from the suspension supplied through the suspension collection tube to obtain a sample; A concentration measurement unit for measuring the nitrogen concentration of the sample obtained by the membrane filtration unit.

[0009] In another concentration measuring apparatus of the present invention, the suspension collecting unit further includes a screen for capturing foreign substances, the screen is washed, and the captured foreign substances are returned to the suspension. A cleaning device. In the suspension collection unit of the present invention, a strainer box having an intake for taking in the suspension, a screen provided in the intake, and washing the screen to remove trapped impurities. A washing device for returning the suspension.

In another suspension collecting unit according to the present invention, the cleaning device further includes a fluid supply source for supplying a cleaning fluid, and a discharge pipe for discharging the fluid into the strainer box.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a conceptual diagram of a concentration measuring device according to an embodiment of the present invention. In the figure, reference numeral 11 denotes a treatment tank, in which wastewater, that is, a suspension, is stored via a line L1. In the treatment tank 11, a biological denitrification method is used as a wastewater treatment method, and the biological denitrification method includes a nitrification step, a denitrification step, and the like.

First, in the nitrification step, an aerobic atmosphere is formed in the treatment tank 11, and in the aerobic atmosphere, the action of ammonia, other The nitrogen component is oxidized to nitrite, nitric acid, and the like. In the next denitrification step, an anaerobic atmosphere is formed in the treatment tank 11, and in the anaerobic atmosphere, nitrite, nitric acid, etc., are caused by vegetative denitrifying bacteria requiring an organic carbon source. Reduced to nitrogen gas.

The suspension after the wastewater treatment by the biological denitrification method is sent to a solid-liquid separator (not shown) via a line L2, where the activated sludge is separated from the activated sludge. Separated from treated water. Incidentally, during the nitrification step and the denitrification step, the form of nitrogen in the suspension changes in the order of ammoniacal nitrogen, oxidized nitrogen and molecular nitrogen. Therefore, the ammonia nitrogen concentration and the oxidized nitrogen concentration of the suspension are measured by the concentration measurement unit 20, and the measurement results are displayed on a monitor (not shown), and based on the measurement results, an aeration blower (not shown) or the like is used. Is automatically controlled.

In measuring the ammonia nitrogen concentration and the oxidized nitrogen concentration, the suspended matter in the suspension is separated by the membrane filtration unit 16 to measure the ammonia nitrogen concentration and the oxidized nitrogen concentration. Sample is obtained. However, for example, when the suspension is sewage, since the suspension often contains impurities such as vegetable waste and hair, if the suspension is directly supplied to the membrane filtration unit 16 as it is. In addition, impurities in the suspension block the flow path and the like to the membrane filtration unit 16 and hinder the separation operation of the membrane.

Therefore, a suspension collection unit 21 is installed in the processing tank 11 so that the suspension collection unit 21 obtains a suspension in the processing tank 11 as a sample. To this end, the suspension collection unit 21 includes a strainer box 13, and the screen 12 is provided at a predetermined position of the strainer box 13. Therefore,
When the suspension is taken into the strainer box 13, impurities in the suspension can be removed by the screen 12, so that the membrane separation operation in the membrane filtration unit 16 can be performed smoothly.

The suspension from which the contaminants have been removed in the suspension collecting unit 21 is supplied to a membrane filtration unit 16 where the suspended substances in the suspension are separated. Let me do. That is, the suspension collection unit 21 and the membrane filtration unit 16 are connected by a suspension collection tube 24, and the suspension collection tube 24 is provided with an on-off valve 25 on the upstream side in the suspension conveyance direction. However, a pump (P) 15 is disposed downstream of the on-off valve 25,
The control valve (not shown) opens and closes the on-off valve 25,
By operating the pump 15, the suspension taken in the strainer box 13 can be selectively supplied to the membrane filtration unit 16. The pump 1
When 5 has the function of an on-off valve, it is not necessary to provide the on-off valve 25.

Further, in the membrane filtration unit 16,
The suspension after passing through the membrane and removing the suspended substance, that is, the permeated water, is supplied to the concentration measurement unit 20 as a sample. On the other hand, the suspended substance is returned to the processing tank 11 via the reflux pipe 26 together with the suspension. The membrane filtration unit 16 and the concentration measurement unit 20 are connected to a sample supply pipe 28.
And a pump (P) 2 is connected to the sample supply pipe 28.
9 are provided.

In the membrane filtration unit 16, a low-pressure reverse osmosis membrane, such as a low pressure reverse osmosis membrane, is used so that suspended substances such as activated sludge do not permeate so as not to impede the measurement, but permeate ammonia nitrogen and oxidized nitrogen. An ultrafiltration membrane, a microfiltration membrane or the like is used. Further, the membrane of the membrane filtration unit 16 constitutes a membrane module such as a flat membrane module, a tubular membrane module, a spiral membrane module, a hollow fiber membrane module, etc., and the suspension side of the membrane is pressurized. Or the permeate side of the membrane is depressurized.

In the concentration measuring device having the above structure, when the concentration of ammonia nitrogen and the concentration of oxidized nitrogen in the suspension are to be measured, the pump 15 is operated by the control device to generate the concentration. The suspension is taken into the strainer box 13 via the screen 12 by the applied negative pressure. At this time, the screen 12 removes impurities contained in the suspension. Then, the suspension taken into the strainer box 13 is passed through the suspension collection tube 24 to the membrane filtration unit 1.
6.

As described above, the contaminants in the suspension are removed by the suspension collection unit 21 disposed in the treatment tank 11, and the suspension after the contaminants are removed is removed from the outside of the treatment tank 11. And the membrane filtration unit 1 disposed outside the treatment tank 11
Since the suspended matter in the suspension is separated by 6, the flow path for supplying the suspension to the membrane filtration unit 16 is not blocked.

The sample obtained in the membrane filtration unit 16 can be used without delay in the concentration measurement unit 20 as compared with a concentration measurement device configured to supply the suspension discharged from the processing tank 11 to the impurity removing device. Therefore, the ammonia nitrogen concentration and the oxidized nitrogen concentration of the suspension in the treatment tank 11 can be measured quickly. However, if the suspension collection unit 21 is used repeatedly, foreign substances adhere to the screen 12 and clogging occurs. Therefore, a cleaning device for cleaning the screen 12 is provided. The cleaning device includes a compressor 1 as a fluid supply source for supplying compressed air as a cleaning fluid.
8, a discharge pipe (not shown) for discharging the compressed air generated by the compressor 18 into the strainer box 13, and a compressed air supply pipe 1 for supplying compressed air to the discharge pipe
7, and an on-off valve 19 provided in the compressed air supply pipe 17
Consists of

When cleaning the screen 12, the pump 15 is stopped, the on-off valve 25 is closed, the compressor 18 is driven, and the on-off valve 19 is opened for a time measured by a timer (not shown). .
To this end, the compressor 18 and the on-off valve 19 are connected to the control device, whereby the compressor 18 is selectively operated and the on-off valve 19 is selectively opened and closed.

Therefore, by operating the compressor 18 and opening the on-off valve 19, compressed air is supplied into the strainer box 13 and the screen 1
By discharging into the suspension outside the suspension collection unit 21 via the second, impurities adhering to the surface of the screen 12 can be removed, and the screen 12 can be washed.

In this case, the contaminants trapped by the screen 12 are returned to the suspension outside the suspension collection unit 21 and the treatment tank 11 is separated by a separately disposed residue removing device.
Removed from Therefore, the suspension collection unit 21
In, the operation can be simplified because there is no need to transport the contaminants to other locations. In the present embodiment, the compressed air generated by the compressor 18 is supplied to the strainer box 13 via the compressed air supply pipe 17.
The compressed water is generated by a pump (not shown) as a cleaning fluid, and the compressed water is supplied to the strainer box 1 through a compressed air supply pipe 17.
3 can also be supplied.

Next, the suspension collecting unit 21 will be described. 2 is a side view of the suspension collecting unit according to the embodiment of the present invention, FIG. 3 is a front view of the suspension collecting unit according to the embodiment of the present invention, and FIG. 4 is a suspension according to the embodiment of the present invention. FIG. 5 is a cross-sectional view of a liquid collection unit, FIG. 5 is a cross-sectional view of a main part of the suspension collection unit in the embodiment of the present invention, and FIG. 6 is a cross-sectional view of a discharge pipe of the suspension collection unit in the embodiment of the present invention. is there.

In the drawing, reference numeral 13 denotes a strainer box having a substantially triangular cross section.
Has a top wall 34, a bottom wall 33, two side walls 30 inclined with respect to the bottom wall 33, and two side walls 32 perpendicular to the bottom wall 33. Each of the side walls 30 has a rectangular shape. ) -Shaped inlet 31 is formed. The screen 12 is attached to each of the intake ports 31.

The screen 12 is formed by a wedge wire, a flat slit, a round bar, or the like.
〜１０10 mm wide. In addition, the said opening can be changed suitably according to the property of a foreign substance. A suspension collection tube 24 is provided at the top of the suspension collection unit 21.
Is fixed. The suspension collection tube 24 penetrates through the top wall 34 of the strainer box 13 and
And the tip 38 is opened near the bottom wall 33.

The compressed air supply pipe 17 is fixed near the bottom wall 33 in the strainer box 13. The compressed air supply pipe 17 is branched into two, penetrates through the side wall 32 of the strainer box 13, and forms two discharge pipes 51 in the strainer box 13.
In addition, a plurality of injection ports 52 are formed in the discharge pipe 51 toward the bottom wall 33.

Therefore, the compressed air generated by operating the compressor 18 (FIG. 1) is supplied to the discharge pipe 51 through the compressed air supply pipe 17, and the compressed air is supplied from the discharge port 52 of the discharge pipe 51 to the strainer box. 13 is discharged. Then, the compressed air discharged from the injection port 52 hits the bottom wall 33 at one end and is then raised, so that the sediment deposited in the vicinity of the bottom wall 33 is impacted by the compressed air. It can be discharged out of the strainer box 13 by force.

Next, the concentration measuring unit 20 will be described. FIG. 7 is a block diagram of the membrane filtration unit and the concentration measurement unit according to the embodiment of the present invention. In the figure, 16 is the membrane filtration unit, 61 is the membrane filtration unit 1
6, a test water tank containing the sample obtained in 6; 62, an ammonia nitrogen measuring unit for measuring the ammonia nitrogen concentration of the sample collected from the water test tank 61; 63, an oxidizing state for measuring the oxidized nitrogen concentration of the sample Nitrogen measuring unit,
64 is a data processing unit, 65 is a monitor, and 66 is a controller for controlling a wastewater treatment device (not shown). Reagent tanks 71 and 72 are connected to the ammonia nitrogen measuring unit 62 and the oxidized nitrogen measuring unit 63, respectively.

In this embodiment, the concentration of ammonia nitrogen and the concentration of oxidized nitrogen in wastewater containing organic matter such as night soil and sewage, and nitrogen etc. are measured. It can also be measured. In addition,
The present invention is not limited to the above embodiments, but can be variously modified based on the spirit of the present invention, and they are not excluded from the scope of the present invention.

[0032]

As described above in detail, according to the present invention, in a concentration measuring device, it is installed in a suspension,
A suspension collection unit that takes in the suspension and removes contaminants from the suspension, is connected to the suspension collection unit by a suspension collection tube, and is supplied through the suspension collection tube. A membrane filtration unit for separating a suspended substance from the suspension to obtain a sample, and a concentration measuring unit for measuring the nitrogen concentration of the sample obtained by the membrane filtration unit.

In this case, for example, impurities in the suspension are removed by a suspension collecting unit installed in the processing tank, and the suspension after the removal of the impurities is taken out of the processing tank. Since the suspended solids in the suspension are separated by the membrane filtration unit disposed outside the treatment tank, a flow path for supplying the suspension to the membrane filtration unit is blocked. Nothing.

In addition, the sample obtained in the membrane filtration unit is supplied to the concentration measurement unit without delay, as compared with a concentration measurement device configured to supply the suspension discharged from the processing tank to the impurity removing device. Therefore, the concentration of ammonia nitrogen and the concentration of oxidized nitrogen in the suspension in the treatment tank can be measured quickly. In another concentration measurement device of the present invention, the suspension collection unit further comprises a screen for capturing impurities, and the screen is washed,
A washing device for returning the trapped impurities to the suspension.

In this case, since the screen can be cleaned by the cleaning device and the impurities can be returned to the suspension, there is no need to transport the impurities to another place. Therefore, the operation can be simplified. In the suspension collection unit of the present invention, a strainer box having an intake for taking in the suspension, a screen provided in the intake, and washing the screen to remove trapped impurities. A washing device for returning the suspension.

In this case, it is possible to remove impurities in the suspension simply by installing a suspension collecting unit in the suspension. Also, the screen is cleaned by the cleaning device,
Since it can be returned into the suspension, there is no need to transport contaminants to other places. In another suspension collecting unit of the present invention, the cleaning device further includes a fluid supply source that supplies a cleaning fluid, and a discharge pipe that discharges the fluid into the strainer box.

In this case, depending on the discharge pressure of the fluid,
The screen can be washed and the contaminants can be returned to the suspension.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a concentration measuring device according to an embodiment of the present invention.

FIG. 2 is a side view of the suspension collection unit according to the embodiment of the present invention.

FIG. 3 is a front view of the suspension collecting unit according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of the suspension collecting unit according to the embodiment of the present invention.

FIG. 5 is a sectional view of a main part of the suspension collection unit according to the embodiment of the present invention.

FIG. 6 is a sectional view of a discharge pipe of the suspension collection unit according to the embodiment of the present invention.

FIG. 7 is a block diagram of a membrane filtration unit and a concentration measurement unit according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Screen 13 Strainer box 16 Membrane filtration unit 17 Compressed air supply pipe 18 Compressor 19 On-off valve 20 Concentration measurement unit 21 Suspension collection unit 24 Suspension collection pipe 31 Intake port 51 Discharge pipe

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[Procedure amendment]

[Submission date] July 25, 1996

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──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication location G01N 1/10 B01D 35/02 Z (72) Inventor Makoto Kamimura 5-9 Kita Shinagawa, Shinagawa-ku, Tokyo No. 11 Sumitomo Heavy Industries, Ltd.

Claims (4)

[Claims] 1. A suspension collection unit installed in a suspension for taking in the suspension and removing impurities from the suspension, and (b) the suspension by a suspension collection tube. A membrane filtration unit that is connected to the suspension collection unit and separates a suspended substance from the suspension supplied through the suspension collection tube to obtain a sample; and (c) obtained by the membrane filtration unit. A concentration measuring unit for measuring the nitrogen concentration of the sample. 2. The suspension collection unit according to claim 1, further comprising: a screen for capturing the foreign matter; and a cleaning device for cleaning the screen and returning the captured foreign matter to the suspension.
The concentration measuring device according to 1. 3. A strainer box having an intake for taking in a suspension, (b) a screen provided in the intake, and (c) the screen washed and captured. A washing unit for returning contaminants into the suspension. 4. The suspension collection unit according to claim 3, wherein the cleaning device includes a fluid supply source that supplies a cleaning fluid, and a discharge pipe that discharges the fluid into the strainer box.