JP2000126790A - Aerobic treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the lowering of treatment capacity by uniformizing the concn. distribution of the microorganism carrier in a treatment tank. SOLUTION: A plurality of air diffusion plates 26 supplying air into water to be treated to form an aerobic condition are arranged to the bottom part in a treatment tank 14 and an air supply line 30 supplying air to a plurality of the air diffusion plates 26 is divided into a plurality of groups from the air diffusion plate 26 on the side of an inflow port 18 to the air diffusion plate 26 on the side of an outflow port 22. Flow rate adjusting valves 32 controlling the amount air supplied to the air diffusion plates 26 of the respective groups are provided to indivisually control the air diffusion amount from the air diffusion plates 26 at groups.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerobic treatment apparatus, and more particularly to a biological treatment using an microorganism carrier while diffusing air into organic wastewater such as sewage, human waste, and industrial wastewater. The present invention relates to an aerobic treatment device.

[0002]

2. Description of the Related Art As an apparatus for purifying organic wastewater such as sewage, human waste, industrial wastewater, etc., a biological treatment is carried out under aerobic conditions using a microorganism carrier having immobilized microorganisms, for example, nitrifying bacteria. There is an aerobic treatment device. In this aerobic diffusion device, the water to be treated flowing from the inlet of the treatment tank contacts the microbial carrier under aerobic conditions with air from a diffuser plate provided at the bottom of the treatment tank to biologically treat the water. After the treatment, it flows out of the outlet of the treatment tank. The diffuser plate is evenly arranged on the entire bottom surface of the processing tank, and the amount of air from the compressor is evenly supplied to the entire diffuser plate, and the air is uniformly diffused from the diffuser plate to the entire processing tank. Like that.

[0003]

However, since the flow of the water to be treated is formed from the inlet to the outlet in the treatment tank, the above-mentioned conventional aerobic treatment apparatus is not used. As the time elapses, the concentration distribution of the microorganism carrier in the water to be treated becomes uneven. As a result, the contact efficiency between the water to be treated and the microorganism carrier is deteriorated, and there is a disadvantage that the biological treatment performance is extremely reduced.

[0004] The present invention has been made in view of such circumstances, and provides an aerobic treatment apparatus capable of uniforming the concentration distribution of microorganism carriers in a treatment tank and preventing a decrease in treatment performance. With the goal.

[0005]

According to the present invention, in order to achieve the above object, the present invention is characterized in that microorganisms are brought into contact with a large number of immobilized microorganism carriers while water to be treated flows in from an inlet and flows out from an outlet. A treatment tank for biologically treating the water to be treated,
At the bottom of the treatment tank, a plurality of diffuser plates are provided to supply air into the water to be treated and form aerobic conditions,
An air diffuser that divides an air supply line for supplying air to the plurality of diffuser plates into a plurality of groups from the diffuser plate on the inlet side to the diffuser plate on the outlet side; Control means for individually controlling the amount of air diffused from the air diffuser plate for each group.

According to the present invention, a plurality of air diffusers are provided at the bottom of a processing tank to supply air into the water to be treated to form aerobic conditions, and air is supplied to the plurality of air diffusers. The air supply lines were divided into a plurality of groups from the diffuser plate on the inlet side to the diffuser plate on the outlet side. And
Control means for controlling the amount of air supplied to the diffuser plates of each group is provided so that the amount of air diffused from the diffuser plates can be individually controlled for each group. Thereby, the degree of diffusion of the microorganism carrier by the bubbles diffused from the diffuser plate can be made different between the inflow side and the outflow side. Therefore,
By increasing the amount of air diffused in places where the concentration of microbial carriers increases due to the effect of the flow of the water to be treated from the inlet to the outlet, and by reducing the amount of air diffused in places where the concentration of distribution decreases, The distribution concentration of the microorganism carrier in the inside can be made uniform.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the aerobic treatment apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view of an aerobic treatment device 10 according to the present invention. As shown in FIG. 1, the aerobic treatment apparatus 10 of the present invention mainly includes a large number of microorganism carriers 12 in which aerobic microorganisms, for example, nitrifying bacteria are comprehensively fixed or adhered,
12 are added, and a diffuser 16 for forming an aerobic condition in the processing tank 14.

The treatment tank 14 is formed in a horizontally long rectangular parallelepiped shape, and a raw water pipe 20 through which water to be treated flows into the treatment tank 14 is connected to an inflow port 18 below one end (left side in FIG. 1). , Outlet 2 on the other end (right side in FIG. 1)
2 is connected to a treated water pipe 24. A screen 27 is provided at the outlet 22 so that the microorganism carrier 12 does not flow out along with the water to be treated.

The air diffuser 16 includes a plurality of air diffusers 26, 26... Arranged from the inlet 18 side to the outlet 22 side of the processing tank 14 over substantially the entire bottom of the processing tank 14. An air supply line 30 connects the compressor 28 provided outside. This air supply line is branched from the main pipe 30A into a plurality of branch pipes 30B, 30B,.
Further, a plurality of connection pipes 30C branched from the branch pipe 30B and the diffuser plate 26 are connected. And each branch pipe 30B
Is provided with a flow control valve 32. As a result, the flow of the water to be processed flowing from the air diffuser plate 26 on the inlet 18 side of the processing tank 14 to the air diffuser plate 26 on the outlet 22 side, that is, In the direction, as shown in FIG. 2, for example, the air diffusers 2 are divided into ten groups A to J and belong to the respective groups A to J.
The amount of air diffused from No. 6 can be individually controlled for each group.

Next, a method for diffusing air in the aerobic treatment apparatus 10 of the present invention configured as described above will be described. The water to be treated which has flowed into the treatment tank 14 from the inlet 18 through the raw water pipe 20 flows through the treatment tank 14 to the outlet 22 under aerobic conditions by air from the diffuser 16 while the microorganism carrier 12 and is biologically treated. The treated water is discharged out of the apparatus 10 through the treated water pipe 24 after the microorganisms are separated by the screen 27 of the outlet 22.

In this biological treatment, in order to increase the contact efficiency between the water to be treated and the microorganism carrier 12, the treatment tank 1
It is important how to make the concentration distribution of the microbial carrier 12 in 4 uniform. Therefore, in the aerobic treatment apparatus 10 of the present invention, of the plurality of groups A to J, the group of the diffuser plates 26 that diffuses at the maximum amount of diffused air with the passage of the outlet 22 side (the water to be treated) as time passes. The flow control valves 32 of each of the groups A to J are controlled so as to sequentially change from the downstream side of the flow of (1) to the inlet 18 side (upstream of the flow of the water to be treated).

FIG. 3A shows an air diffusion method in a conventional aerobic processing apparatus in which air is diffused from each of the groups A to J into the processing tank 14 at a uniform amount. (B) ~
(J) shows a method of diffusing air in the aerobic treatment device of the present invention. FIGS. 4A to 4J correspond to FIGS.
7 shows the concentration distribution of the microorganism carrier 12 in the treatment tank 14 in the aeration method of (j). As shown by a gray bar indicating the relationship between the concentration of the microorganism carrier 12 and the shade of black in FIG. 4, the darker the black, the greater the concentration of the microorganism carrier 12 is. The concentration of the microorganism carrier 12 in the darkest black portion is 15%.

As shown in FIG. 3A, in the case of a conventional case where air is diffused from each of the groups A to J with a uniform amount of air, FIG.
As shown in the figure, the concentration distribution of the microorganism carrier 12 becomes larger toward the outlet 22, and the distribution concentration of the microorganism carrier 12 in the treatment tank 14 is greatly biased. In particular, many microbial carriers 12 tend to stay below the screen 27 of the processing tank 14.

Next, the aeration method of the present invention was performed from the state of the conventional concentration distribution of the microorganism carrier 12. That is,
As shown in FIG. 3B, the amount of air diffused in the group J closest to the outlet 22 is maximized, the amount of air diffused in the group I is made second largest, and the amount of air diffused in the other groups A to H is increased. Was the same and minimized. Next, as shown in FIG. 3C, the amount of air diffusion of the group I is maximized, the amount of air diffusion of the groups H and J is made the second largest, and the amount of air diffusion of the other groups A to G is the same. To minimize it. Next, as shown in FIG. 3D, the amount of air diffused in the group H is maximized, the amount of air diffused in the groups G and I is made the second largest, and the air diffused in the other groups A to F and the group J. The amount was the same and minimized. In this manner, the group with the maximum air diffusion amount is sequentially changed from the outlet 22 side to the inlet 18 side with the passage of time, and as shown in FIG. When the amount of air diffused in A and C was the second and the amount of air diffused in the other groups D to J was the same and minimized, the air diffused state was returned to the state shown in FIG. 3B again.

As can be seen from FIGS. 4 (b) to 4 (j), by changing the group of the maximum amount of diffused air from the outlet 22 to the inlet 18 over time, the processing tank 14
Even if the flow of the water to be treated from the inlet 18 to the outlet 22 is formed therein, the microorganism carrier 12 (the dark black portion in FIG. 4) that has stayed at the outlet 22 moves to the inlet 18 side. Meanwhile, it is gradually spread. Thereby, the concentration distribution of the microorganism carrier 12 in the treatment tank 14 can be made uniform.

FIG. 5 shows another air diffusion method by the aerobic treatment apparatus 10 of the present invention. The air diffusion plate 26 diffuses from the group on the inlet 18 side to the group on the outlet 22 side. The flow control valves 32 of each group are controlled so that the amount of diffused air gradually increases. That is, of the groups A to J, an air diffusion method in which the amount of air diffused from the group A on the inflow port 18 side is minimized, and the amount of air diffused gradually increases toward the group J on the outflow port 22 side. Is performed regularly.

According to another aeration method using the aerobic treatment apparatus of the present invention, a counterclockwise swirling flow (arrow in FIG. 6) is formed in the treatment tank 14 as shown in FIG. Even if the flow of the water to be treated from the inlet 18 to the outlet 22 (solid line in FIG. 6) is formed in the treatment tank 14, the microorganism carrier 12
Is diffused throughout the processing tank 14 without staying at the outlet 22 side. Thereby, the microorganism carrier 12 in the treatment tank 14 is
Can be made uniform.

In the embodiment of the present invention, an example has been described in which the groups of diffuser plates are grouped into ten groups A to J, but the number of groups is not limited to this.
Further, in the embodiment of the present invention, the shape of the treatment tank is described as a rectangular parallelepiped.However, the present invention is not limited to this, and the flow of the water to be treated from the inlet to the outlet is formed in the treatment tank. The present invention can be applied to a processing tank having a structure as described above.

[0019]

As described above, according to the aerobic treatment apparatus of the present invention, the concentration distribution of the microorganism carrier in the treatment tank can be made uniform, so that the contact efficiency between the water to be treated and the microorganism carrier is improved. Can be improved. Thereby, the performance of the aerobic treatment device can be improved.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view illustrating an overall configuration of an aerobic treatment device of the present invention.

FIG. 2 is an explanatory view illustrating an example of grouping of diffuser plates;

FIG. 3 is an explanatory view for explaining an air diffusion method by the aerobic treatment device of the present invention.

FIG. 4 is an explanatory view for explaining a concentration distribution of a microorganism carrier in a treatment tank when a diffuser method is performed by the aerobic treatment device of the present invention.

FIG. 5 is an explanatory view for explaining another air diffusing method by the aerobic treatment device of the present invention.

FIG. 6 is an explanatory diagram for explaining a flow state of water to be treated in a treatment tank when another aeration method is performed by the aerobic treatment device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Aerobic treatment apparatus 12 ... Microorganism carrier 14 ... Treatment tank 16 ... Aperture apparatus 18 ... Inlet 20 ... Raw water pipe 22 ... Outflow port 24 ... Treatment water pipe 26 ... Aperture plate 27 ... Screen 28 ... Compressor 30 ... Air Supply line 32: Flow control valve

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D003 AA12 AB02 BA02 CA02 CA07 DA11 DA18 DA20 EA01 FA05 4D028 BB02 BC12 BD06 CA09 CB08

Claims (3)

[Claims] A treatment tank for biologically treating the water to be treated by bringing microorganisms into contact with a number of microorganism carriers immobilized while the water to be treated flows in from an inlet and flows out from an outlet; At the bottom of the treatment tank, a plurality of diffuser plates are provided to supply air into the water to be treated and form aerobic conditions,
An air diffuser that divides an air supply line that supplies air to the plurality of diffuser plates from the diffuser plate on the inlet side to the diffuser plate on the outlet side into a plurality of groups; Control means for individually controlling the amount of air diffused from the air diffuser plate for each group, and an aerobic treatment device comprising: 2. The control means so that a group having a maximum amount of air diffused from the air diffuser plates of each of the groups sequentially changes from an outlet side to an inlet side with the passage of time. The aerobic treatment device according to claim 1, wherein 3. The control means is controlled such that the amount of air diffused from the air diffuser plate increases stepwise from the inlet side group to the outlet side group. The aerobic treatment device according to claim 1.