JP2650086B2 - Bottom sludge activation treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for activating sediment sludge, and more particularly to an apparatus for activating microorganisms in sediment by aerating sediment deposited on the bottom of water such as a lake. The present invention relates to a sediment sludge activation treatment device suitable for collecting measurement data for sediment purification when sludge is reformed.

[0002]

2. Description of the Related Art In order to treat harmful sediment deposited on the bottom of a lake or the like, there is known a method in which dredged sediment is treated by removing the water by solar drying and then treated. It not only requires a lot of land, but also has the disadvantage that it emits offensive odors until solar drying is completed.

[0003] On the other hand, there is a method in which a batch type sludge treatment method is applied at a test stage to apply aeration to harmful sediment for a certain period to promote the activation of microorganisms and reform the activated sludge. Since the batch type sludge treatment method itself was introduced from the Netherlands in 1960, it has been widely used in the field of water treatment until today. As a treatment tank, an aeration tank and a sedimentation tank are used as a single bioreactor tank. Since it can be used for both purposes, the economic effect is great, and since it is not necessary to return the sludge from the sedimentation tank to the aeration tank, addition of wastewater, start and end of aeration,
If a series of operations such as settling of sludge and start of discharge of treated water are controlled by automatic control, there is an advantage that unmanned operation of the treatment equipment is possible.

[0004]

In the batch type sludge treatment method, while giving appropriate aeration for activating microorganisms,
Measure the hydrogen ion concentration (pH), dissolved oxygen concentration (DO), and redox potential (ORP), determine the dissolved oxygen concentration waveform over time from the measured data, and analyze the MLSS, MLVSS and COD, BOD based on the analysis. Determining the required amount of oxygen to be provided by aeration from the relationship with the respiration rate of microorganisms is an important factor in determining the success or failure of microorganism activation. However, in the past, such measurement data collection and analysis has only been adopted when applying the batch activated sludge treatment method in the water treatment field, and has only been useful for water purification, and has been deposited on the bottom of lakes and marshes. Although direct aeration is being carried out gradually in the process of reforming harmful sediments, the guidelines for sediment reforming have not yet been elucidated to date.

[0005] It is an object of the present invention to provide an apparatus for activating sludge sediment capable of collecting measurement data for purification of sediment in a short period of time when activating sediment sediment such as a lake by aeration. To provide.

[0006]

According to the first aspect of the present invention, there is provided an apparatus for activating a microorganism in a sediment by applying aeration to a sample of the sediment. A bioreactor tank whose bottom is divided into a plurality of areas in the cross-section and a space in the tank common to each of the fractionation areas is connected to the upper part thereof, and aeration from the bottom plate independently for each of the fractionation areas. A plurality of aeration systems capable of, and a stirrer for stirring the sludge treatment water in the common tank space, hydrogen ion concentration of the treated sludge in the tank, dissolved oxygen concentration,
It is characterized by comprising a measuring means for measuring an oxidation-reduction potential and a temperature, and a control means for controlling aeration by the aeration system and stirring by the stirrer.

According to a second aspect of the present invention, there is further provided a data processing device for collecting and analyzing the measurement data obtained from the measurement means to create sediment purification data. is there.

[0008]

In the present invention, a collection of harmful sediment deposited on the bottom of a lake or the like is aerated, and at that time, measurement data of dissolved oxygen and the like in the bioreactor tank is collected to purify the sediment. Obtain control data such as the optimal amount of aeration. In other words, in the present invention, the batch activated sludge treatment method is basically used as the sludge activation treatment method, and the bottom region in one bioreactor tank is divided into a plurality of areas in a cross section, and each region is divided into a plurality of areas. The adoption of a configuration that provides independent aeration makes it possible to collect data for purification of sediment at a laboratory level in a short period of time. In this case, as the measurement data for the sediment purification, the hydrogen ion concentration (pH), the dissolved oxygen concentration (DO), the oxidation-reduction potential (ORP), and the temperature of the sediment in the tank are measured. You.

According to the apparatus of the present invention, the bottom region in one bioreactor tank can be divided into a plurality of areas in a cross section, and aeration can be independently applied to each of the fractionation areas. The activation process, such as how the activation spreads to the sediment in the fractionation area not subjected to aeration, can be grasped while observing the oxygen transfer efficiency by analyzing the measurement data.

Usually, the aeration amount is adjusted according to the measurement data while applying a fixed amount of aeration. However, in the apparatus of the present invention, a plurality of fractionation areas for storing the sediment sludge are formed on the bottom in the bioreactor tank. Since it is formed, for example, in the case of four fractions, measurement data can be collected at once with respect to the dissolved oxygen concentration in four stages, and the data collection period can be significantly shortened as compared with the conventional case.

The number of fractionation areas, that is, the number of fractions at the bottom of the tank, can be arbitrarily selected depending on the diameter of the bioreactor tank. However, from the viewpoint of the accuracy of comparison of measurement data by aeration for each fractionation area. Is preferably up to about 4 fractions. For example, in the case of a cylindrical bioreactor tank, only the bottom in the tank is divided into four or less fan-shaped areas symmetrical with respect to the central axis, and when arranging a partition wall between the respective fractionation areas, the separation is performed. It is desirable to have a structure detachable from the bottom of the tank in case the number of strokes is changed or fractionation is not performed.

The apparatus of the present invention has a total weight of 100, for example.
It can be transported by truck, etc. because it can be realized with a relatively compact structure of about 0 kg. Therefore, when collecting sediment purification data for lakes and marshes all over the country, go to lakes and marshes around the country and collect sediment sludge at the site. The data can be easily collected by performing the aeration activation process described above, and the collected data can be transferred over a telephone line or brought back for analysis. Of course, it is needless to say that by increasing the size of such a portable device, a large-scale practical plant for activating sludge by an optimal purification control operation based on analysis of measurement data can be realized. .

The degree of microbial activation in the sediment is determined by the relationship between the dissolved oxygen concentration DO and the oxidation-reduction potential ORP, the transition of the hydrogen ion concentration pH, MLSS, MLVSS and CO2.
It is known that it can be determined based on how much D and BOD have decreased.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the main structure of an apparatus for activating sludge sediment according to one embodiment of the present invention is schematically shown, and will be described in detail below. It should be noted that the present invention is not limited to this embodiment, and it goes without saying that various design changes can be made without departing from the spirit of the present invention.

In FIG. 1, a bioreactor tank 1 comprises:
It is a cylinder with a diameter of 1000 mm and a height of 1500 mm,
On its bottom is a 400 mm high inverted conical bottom structure 1
a is connected. The bottom surface of the bottom structure 1a is a conical surface with an inclination angle of about 45 degrees, but may be a horizontal bottom surface, and is made of a transparent resin such as PVC, so that the inside can be seen from any angle. ing.

The interior of the bottom structure 1a is divided into four divided areas in a cross section by a removable cross-shaped partition wall 1b. A stirring paddle 2a of a variable speed stirrer 2 having a speed of 10 to 240 rpm is disposed on a central axis in the tank 1 so as to be located above the partition wall 1b, and the paddle and the shaft are made of stainless steel. In the present embodiment, the partition wall 1b is provided when forming the fractionation area. However, since the aeration system is controlled independently as described later, the fractionation is substantially performed. The partition wall can be omitted depending on the quality sludge.

In each of the four fractionation areas, as shown in FIG. 2A, two aeration tubes N1 to N8 are respectively arranged along the bottom surface.
Types of aeration tubes, such as N1 and N2, are shown in FIGS. 2b and 2c.
As shown in FIG. In addition, a common drain pipe 1c is guided to the outside from the lowermost part of each divided area.

As shown in FIG. 1, each of the aeration tubes N1 to N8 has a flow meter FI1 to FI8 and a flow control valve V1.
To V8, and are connected to the air pump 11 to form independent aeration systems 3 to 10, respectively. The aeration flow rate of each aeration system can be independently adjusted within a range of, for example, 0.06 to 0.3 Nm3 / h by controlling the flow rate adjustment valves V1 to V8 and the air pump 11 by a control system as described later. It has become.

Four types of sensors penetrate the upper lid of the tank 1,
That is, the thermocouple type thermometer 12 (0 to 50)
° C), electrode type dissolved oxygen concentration (DO) measuring device 13 (0 to 0)
15 mg / l), electrode type hydrogen ion concentration (pH) meter 14 with brush washing function (pH 1 to 14), and electrode type oxidation-reduction potential (ORP) measuring device 15 (-700 to +700 m)
V) is inserted.

On the other hand, each of the aeration systems 3 to 10 is independent, so that sludge to which no aeration is applied is provided in one of the four fractionation areas, and for example, the aeration is performed in the second fractionation area. The measurement data on the activation process of microorganisms in the tank is collected from each sensor, and finally, how sludge activated in one fractionation area diffuses into another fractionation area and becomes active Information on the actual purification of sediments in lakes and marshes can be obtained, including information on how spillover is spreading.

FIG. 3 shows a state where the bioreactor tank 1 and peripheral devices are mounted on a portable base. This stand has a total height of 3350 mm, an occupied area of about 2500 × 2400 mm, and a total weight of about 1000 kg, so that it can be carried by a small truck. Therefore, it is possible to collect necessary measurement data for purification by going to lakes and marshes all over the country and processing the collected sediment sludge locally.

FIG. 4 shows an example of a bioreactor control system in which a personal computer is combined with the above-described embodiment apparatus. Note that, in FIG. 4, portions corresponding to those in FIG. 1 are denoted by the same reference numerals. This bioreactor control system comprises a bioreactor tank 1 connected to a structure 1a having four fractionation areas at the bottom,
The aeration system is connected to an air pump (compressor) 11 by dividing the aeration system 3 to 4 into four systems, four types of measuring instruments 12 to 15 attached to the tank 1, and for stirring the sludge in the tank 1. , And these are as described above.

The control system further independently controls each flow control valve of the aeration system by four systems, and controls the air pump 11
And a control unit (control panel) 21 for controlling the start / stop of the stirrer and the rotation speed of the stirrer 2,
Mixing controller 22 for controlling stop operation
And digitizing the measurement data by the measuring instruments 12 to 15 and sending it to the computer 24,
An A / D and D / A converter (converter) 23 which converts the control data sent from the control unit 4 into an analog signal and sends it to the control unit 21 is provided. The computer 24 may be a portable personal computer, which performs information processing and storage of measurement data, sends control commands in accordance with signals given from an input keyboard or a storage device, and has a printer 25 connected as a data output device. I have.

In operation of such a control system, the collected sludge is put into the bioreactor tank 1 and the bottom structure 1a communicating therewith, and then a computer 24 sends a command to the control unit 21 to start aeration. Air pump 1 from control unit 21
1 and a start signal is sent to start aeration. At this time, the respective opening degree commands are also given from the computer 24 via the converter 23 and the control unit 21 to the flow rate adjustment valves V1 to V8 of the respective aeration systems, and the aeration flow rates of the respective aeration systems are measured by the flow meters FI1 to FI8. The measured amount is sent to the computer 24 via the converter 23 and the aeration amount is controlled by the feedback control.

Data measured by each of the measuring instruments 12 to 15 is as follows:
By a command from the computer 24, at fixed time intervals,
For example, it is taken into the computer 24 as digital data via the converter 23 every 10 minutes,
The information processing is performed by an arithmetic program installed in advance, and the dissolved oxygen concentration and the required oxygen amount are calculated from the dissolved oxygen concentration waveform over time. Thus, the second aeration amount is determined, a command is given from the computer 24 to the control unit 21, the aeration amount is corrected, and the second aeration is performed. By repeating such a series of controls for several days, the computer 24 accumulates the optimum data necessary for the purification treatment of the sludge put into the tank 1. Since the stirrer 2 functions as a common in-tank stirrer above the four fractionation areas, the dissolved oxygen concentration in the tank due to aeration from the selected fractionation area can be kept uniform above the fractionation area. it can.

[0026]

As described above, according to the present invention,
Dividing the bottom of the bioreactor tank into multiple fractionation areas,
Since each fractionation area can be independently aerated, measurement data can be used to grasp the history of the spread of activation from one fractionated area that has been aerated to other fractionation areas, and even to all areas. Moreover, since the dissolved oxygen concentration can be measured all at once at a stage corresponding to the number of divisions of the fractionation area, an effect that necessary data can be obtained in a short period of time can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a main configuration of a bottom sludge activation treatment apparatus according to one embodiment of the present invention.

FIG. 2 shows an arrangement state (a) of an aeration tube arranged at a bottom portion in a tank.
FIG. 2 is a schematic plan view showing a shape and a shape (b and c diagrams).

FIG. 3 is a side view showing the apparatus according to the embodiment when incorporated in a portable gantry.

FIG. 4 is an explanatory diagram illustrating an example of a bioreactor control system configured by combining a personal computer with the embodiment apparatus.

[Explanation of symbols]

1: Bioreactor tank, 1a: Bottom structure, 1
b: partition wall, 2: stirrer, 2a: stirring paddle, 3 to 10: aeration system, N1 to N8: aeration tube,
FI1 to FI8: flow meter, V1 to V8: flow control valve, 11, air pump, 12: thermocouple type thermometer, 13: electrode type dissolved oxygen concentration (DO) measuring device, 1
4: Electrode type hydrogen ion concentration (pH) with brush cleaning function
Total, 15: Electrode oxidation-reduction potential (ORP) measuring device, 2
1: control unit, 22: mixing controller, 23: A / D and D / A converter, 24: computer, 25: printer.

Continuation of front page (72) Inventor Shigeru Ochiai 2-7-1, Nishishinjuku, Shinjuku-ku, Tokyo Inside Tetrapod Co., Ltd. (56) References JP-A-62-38296 (JP, A) JP-A-61 -209098 (JP, A)

Claims (2)

(57) [Claims] 1. An apparatus for activating a microorganism in a sediment by applying aeration to a sample of sediment sludge deposited on a water bottom, wherein a bottom of a space in a tank has a plurality of cross sections in a cross section. A bioreactor tank that is fractionated into areas and a space in the tank common to each fractionation area is provided above the fractionation area;
A plurality of aeration systems capable of independently applying aeration from the bottom for each fractionation area, a stirrer for stirring the sludge treated water in the common tank space, and a hydrogen ion concentration of the treated sludge in the tank, A sludge activation treatment apparatus comprising: a measuring means for measuring a dissolved oxygen concentration, an oxidation-reduction potential, and a temperature; and a control means for controlling aeration by the aeration system and stirring by the stirrer. 2. The sludge activation process according to claim 1, further comprising a data processing device for collecting and analyzing the measurement data obtained from the measurement means to create sediment purification data. apparatus.