CN116514272A - Sewage treatment system and regulation and control method thereof - Google Patents

Abstract

The application relates to a sewage treatment system and its control method, and relates to the technical field of sewage treatment. The device includes: a biochemical pool equipped with a movable electric weir gate, the inner wall of which is equipped with a biochemical pool outlet weir, and the movable electric weir gate is configured so that it can be opened Or change the cofferdam height and water outlet efficiency of the biochemical pool outlet weir when it is closed; the MBR membrane pool is connected with the biochemical pool through the biochemical pool outlet well; the water inlet is connected with the biochemical pool, and the connection is equipped with an inlet pump; It is used to control the opening degree of the movable electric weir gate, regulate the flux from the biochemical pool to the MBR membrane pool, and also control the operating power of the water inlet pump, and regulate the flux from the water inlet to the biochemical pool, so that the biochemical pool and the MBR membrane The liquid level of the pool meets the corresponding preset liquid level requirements. This application controls the opening and closing of the movable electric weir gate and the degree of opening to control the total amount of water effluent in the biochemical pool to meet the capacity requirements of the MBR membrane pool.

Description

A sewage treatment system and its control method

technical field

The application relates to the technical field of sewage treatment, in particular to a sewage treatment system and a control method thereof.

Background technique

At the present stage, the sewage treatment process water plant that adopts the membrane technology at the end of the biochemical tank instead of the secondary sedimentation tank is faced with a large amount of water inflow during the day and a small amount of water inflow at night, and it is often difficult for the MBR membrane tank to operate at full capacity at night. , the water output is limited. In the traditional operation mode, some membrane groups are basically shut down to reduce the total amount of passing water. This method is difficult to maximize the operation capacity of the water plant, and the economic benefits are not good. The amount of influent that can be provided by municipal water pipes during the day far exceeds the capacity that the sewage plant can handle, and it is difficult to digest this part of influent in the traditional operation mode. Therefore, the distribution of water inflow time is uneven, and the total amount is difficult to reach the maximum processing capacity of the plant area.

Therefore, in order to improve the current sewage treatment process, a sewage treatment technology is now provided.

Contents of the invention

This application provides a sewage treatment system and its control method. By installing a movable electric weir door, by controlling the opening and closing of the movable electric weir door and the degree of opening, the height of the outlet weir of the biochemical pool is controlled, and then the biochemical pool is controlled. The total amount of effluent water can meet the large flow of water when the water inflow is small, and meet the capacity requirements of the subsequent MBR membrane pool.

In order to achieve the above purpose, the present application provides the following solutions.

In a first aspect, the application provides a sewage treatment system, the system comprising:

A biochemical pool, the biochemical pool is equipped with a movable electric weir gate, the inner wall of the biochemical pool is provided with a biochemical pool outlet weir, the movable electric weir gate is set on the biochemical pool outlet weir, and the movable electric weir gate is It is configured to change the cofferdam height and water outlet efficiency of the outlet weir of the biochemical pool when it is turned on or off, and the bottom of the outlet weir of the biochemical pool is connected to the outlet well of the biochemical pool;

MBR membrane pool, which communicates with the biochemical pool through the well outlet of the biochemical pool;

The water inlet is connected with the biochemical pool, and the connection between the biochemical pool and the water inlet is equipped with a water inlet pump;

PLC automatic control system, which is used to control the opening degree of the movable electric weir door, thereby regulating the flow rate from the biochemical pool to the MBR membrane pool, and is also used to control the operating power of the water inlet pump, so as to regulate the flow rate of the water inlet pump. The flow rate of the water to the biochemical pool, so that the liquid levels of the biochemical pool and the MBR membrane pool meet the respective corresponding preset liquid level requirements.

Further, the system also includes:

When the liquid level of the biochemical pool is higher than the top surface of the biochemical pool outlet weir, the liquid in the biochemical pool will flow into the opening on the top surface of the biochemical pool outlet weir, and then flow to the MBR membrane pool;

When the liquid level of the biochemical pool is within the opening range of the movable electric weir door, the flow of the liquid in the biochemical pool to the MBR membrane pool is controlled by regulating the opening degree of the movable electric weir door. rate.

Further, the outlet weir of the biochemical pool is arranged horizontally, and the outlet well of the biochemical pool is arranged vertically.

Further, the system also includes:

A biochemical pool liquid level gauge, which is used to monitor the liquid level of the biochemical pool, obtain the liquid level data of the biochemical pool and send it to the PLC automatic control system.

Further, the system also includes:

The MBR membrane tank liquid level gauge is used to monitor the liquid level of the MBR membrane tank, obtain the MBR membrane tank liquid level data and send it to the PLC automatic control system.

Further, the system also includes:

Movable electric weir gate relay, which is connected with the PLC automatic control system and the movable electric weir gate signal;

The PLC automatic control system controls the opening degree of the movable electric weir gate through the movable electric weir gate relay.

Further, the system also includes:

Water inlet pump relay, which is connected with the PLC automatic control system and the water inlet pump signal;

The PLC automatic control system controls the operating power of the water inlet pump through the water inlet pump relay.

Further, when the PLC automatic control system controls the opening degree of the movable electric weir gate, there is a first corresponding relationship between the opening degree of the movable electric weir gate and the MBR membrane tank liquid level data of the MBR membrane tank;

The first corresponding relationship is: Y=*2*100%; wherein,

X is the MBR membrane tank liquid level data of the MBR membrane tank, Y is the opening degree of the movable electric weir gate, and Z is the first preset MBR membrane tank liquid level threshold of the MBR membrane tank.

Further, the PLC automatic control system is also used to control the water inlet pump to operate at the first operating power until the water level of the biochemical pool is reached when the water intake in the water intake room reaches the first water intake threshold. When the data reaches the preset liquid level of the biochemical pool, the water inlet pump is controlled to operate at the second operating power.

In a second aspect, the present application provides a control method for a sewage treatment system, the method is based on the sewage treatment system mentioned in the first aspect, and the method includes the following steps:

When the liquid level of the MBR membrane tank (3) is lower than the first preset MBR membrane tank liquid level threshold, the PLC automatic control system (6) controls to open the movable electric weir gate (2);

When the water intake in the water intake room (4) exceeds the first water intake threshold, the PLC automatic control system (6) controls the water intake pump (5) to operate with the first increased power;

When the liquid level of the biochemical pool (1) reaches the first preset biochemical pool liquid level threshold, the PLC automatic control system (6) controls the water inlet pump (5) to reduce to a preset normal power operation.

The beneficial effects brought by the technical solution provided by the application include:

This application generally controls the height of the outlet weir of the biochemical pool by installing a movable electric weir door, and by controlling the opening and closing of the movable electric weir door and the degree of opening, and then controls the total amount of water outlet of the biochemical pool to meet the requirements of relatively high water intake. When it is small, it can also discharge water at a large flow rate to meet the capacity requirements of the subsequent MBR membrane pool.

Explanation of terms:

MBR: Membrane Bio-Reactor, membrane bioreactor;

PLC: Programmable Logic Controller, programmable logic controller;

SDI: Silt Density Index, silt density index;

HRT: Hydraulic Retention Time, hydraulic retention time

SRT: Sludge Retention Time, sludge retention time.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is the schematic diagram of the structure of the sewage treatment system provided in the embodiment of the application;

Fig. 2 is the schematic structural view of the biochemical pool and the movable electric weir gate in the sewage treatment system provided in the embodiment of the present application;

Fig. 3 is a detailed structural diagram of the biochemical pool and the movable electric weir gate in the sewage treatment system provided in the embodiment of the present application;

Fig. 4 is another structural detail diagram of the biochemical pool and the movable electric weir gate in the sewage treatment system provided in the embodiment of the present application.

In the picture:

1. Biochemical pool; 10. Outlet weir of biochemical pool; 11. Well out of biochemical pool; 12. Liquid level gauge of biochemical pool; 2. Movable electric weir gate; 20. Movable electric weir gate relay; 3. MBR membrane pool; 30 , MBR membrane tank liquid level gauge; 4, water inlet; 5, water inlet pump; 50, water inlet pump relay; 6, PLC automatic control system.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

Embodiments of the present application will be described in further detail below in conjunction with the accompanying drawings.

The embodiment of the present application provides a sewage treatment system and its control method. By installing a movable electric weir door, by controlling the opening and closing of the movable electric weir door and the degree of opening, the height of the weir outlet of the biochemical pool is controlled, and then the The total amount of water output from the biochemical pool can meet the large flow of water when the water inflow is small, and meet the capacity requirements of the subsequent MBR membrane pool.

In order to achieve the above-mentioned technical effects, the general idea of the application is as follows:

A sewage treatment system comprising:

Biochemical pool 1, a movable electric weir gate 2 is arranged on the biochemical pool 1, a biochemical pool outlet weir 10 is arranged on the inner wall of the biochemical pool 1, and the movable electric weir gate 2 is arranged on the biochemical pool outlet weir 10, The movable electric weir gate 2 is configured to change the cofferdam height and water outlet efficiency of the biochemical pool outlet weir 10 when it is opened or closed, and the bottom of the biochemical pool outlet weir 10 is connected to a biochemical pool outlet well 11;

MBR membrane pool 3, which communicates with the biochemical pool 1 through the well 11 of the biochemical pool;

Water inlet room 4, which communicates with the biochemical pool 1, and a water inlet pump 5 is arranged at the communication place between the biochemical pool 1 and the water inlet room 4;

PLC automatic control system 6, which is used to control the opening degree of the movable electric weir gate 2, thereby regulating the flow rate from the biochemical pool 1 to the MBR membrane pool 3, and is also used to control the operation of the water inlet pump 5 Power, so as to regulate the flow rate from the water inlet 4 to the biochemical pool 1, so that the liquid levels of the biochemical pool 1 and the MBR membrane pool 3 meet the corresponding preset liquid level requirements.

Embodiments of the present application will be described in further detail below in conjunction with the accompanying drawings.

In the first aspect, the embodiment of the present application provides a sewage treatment system, which includes:

Biochemical pool 1, a movable electric weir gate 2 is arranged on the biochemical pool 1, a biochemical pool outlet weir 10 is arranged on the inner wall of the biochemical pool 1, and the movable electric weir gate 2 is arranged on the biochemical pool outlet weir 10, The movable electric weir gate 2 is configured to change the cofferdam height and water outlet efficiency of the biochemical pool outlet weir 10 when it is opened or closed, and the bottom of the biochemical pool outlet weir 10 is connected to a biochemical pool outlet well 11;

MBR membrane pool 3, which communicates with the biochemical pool 1 through the well 11 of the biochemical pool;

Water inlet room 4, which communicates with the biochemical pool 1, and a water inlet pump 5 is arranged at the communication place between the biochemical pool 1 and the water inlet room 4;

PLC automatic control system 6, which is used to control the opening degree of the movable electric weir gate 2, thereby regulating the flow rate from the biochemical pool 1 to the MBR membrane pool 3, and is also used to control the operation of the water inlet pump 5 Power, so as to regulate the flow rate from the water inlet 4 to the biochemical pool 1, so that the liquid levels of the biochemical pool 1 and the MBR membrane pool 3 meet the corresponding preset liquid level requirements.

As shown in Figure 2 of the accompanying drawings, the interior of the biochemical pool 1 can include a plurality of sequentially nested cylindrical structures. At this time, the biochemical pool outlet weir 10 and the biochemical pool outlet well 11 can be arranged on the outermost side wall of the biochemical pool 1 on the inner wall.

It should be noted that the maximum treatment and water output capacity of the sewage treatment system are realized by controlling the movable electric weir gate 2 and the water inlet pump 5 through the liquid level of the biochemical tank 1 and the MBR membrane tank 3 .

At present, the MBR membrane process is a new process applied in the field of sewage treatment to replace the secondary sedimentation tank in recent years. It is a process that combines the activated sludge microbial treatment method with the whole process of membrane separation technology. It can greatly reduce the amount of sludge discharge and improve the quality of effluent water; the main advantages are as follows:

1 Greatly reduce the land occupation, thereby reducing the cost of civil engineering;

2 Stronger residue sludge load, no agglomeration and overturning;

3 Stronger effluent quality, SDI≤3;

4 Improve the biochemical treatment method, increase the capacity load, increase HRT and SRT, greatly reduce the amount of sludge exhaust, and then reduce the cost of sludge disposal; it is beneficial to the removal of permanganate index;

5. The operation is more stable.

But at the same time, it should be noted that the process is often limited by the membrane flux and the water level of the membrane pool. Water flow capacity, because the water level of the membrane pool will drop due to the large opening, the liquid level gauge contained in the membrane module will automatically stop pumping after detecting that the liquid level reaches the warning water level, resulting in a smaller water output.

Traditional treatment methods are mainly divided into two types. When the water intake at the water inlet is small, the first is to operate at the membrane tank, that is, reduce or close the membrane module to reduce the water output, so that the liquid level of the membrane tank reaches balance. The second is to operate at the outlet of the biochemical pool. By installing an axial flow pump, when the water inflow is small, the water in the biochemical pool is pumped to replenish the membrane pool, so as to meet the processing capacity of the membrane pool and achieve the maximum water output. Normal water output .

Therefore, the advantages and disadvantages of the traditional two types of methods are obvious. One is that the total water output in the whole day is greatly reduced due to the closure of the membrane module, and the economic benefits of production are reduced; Moreover, the one-time investment cost of installing multiple high-power axial flow pumps in the early stage is relatively high, and the overall economic benefits are not good.

In contrast, the sewage treatment system of the embodiment of the present application controls the height of the outlet weir 10 of the biochemical pool by installing the movable electric weir gate 2 and controlling the opening and closing of the movable electric weir gate 2 and the degree of opening. Furthermore, the total amount of water output from the biochemical pool 1 is controlled to meet the large flow rate of water output when the water inflow is small, and to meet the capacity requirements of the subsequent MBR membrane pool 3.

The embodiment of the present application monitors the liquid level height of the MBR membrane pool 3 in real time by adding a liquid level gauge at the MBR membrane pool 3;

When the water output is small due to the small amount of water inflow, the PLC automatic control system 6 issues an instruction to open the movable electric weir gate 2 to increase the water output of the biochemical pool to meet the processing capacity of the membrane pool;

When it is detected that the liquid level of the MBR membrane tank 3 exceeds the predetermined liquid level, the opening degree of the movable electric weir gate 2 is reduced to reduce the water output of the biochemical tank and maintain the balance of the liquid level of the membrane tank.

The embodiment of the present application also monitors the liquid level height of the biochemical pool 1 by adding a liquid level gauge in the biochemical pool 1. When the water supply capacity of the municipal pipe network is sufficient during the day and at the same time detects that the liquid level of the biochemical pool 1 is lower than the set liquid level, The PLC automatic control system 6 increases the power of the water inlet pump 5 to supplement the missing liquid level of the biochemical pool 1, and when the preset liquid level is reached, the water inlet pump 5 is adjusted to operate at normal power;

The treatment capacity can be flexibly adjusted when the influent fluctuates greatly, so as to maximize the utilization rate of the biochemical pool 1 and the utilization rate of the MBR membrane pool 3, and improve economic benefits.

In the embodiment of the present application, by adding a movable electric weir gate 2 to the biochemical pool outlet weir 10 of the biochemical pool 1, the lifting of the movable electric weir gate 2 is adjusted, thereby controlling the change of the overall liquid level of the biochemical pool 1, and then controlling the biochemical pool Changes in total water output;

It is mainly used in water plants where the water inflow varies greatly throughout the day. When the water inflow is small at night, it can maintain the water output to a certain amount by excessively releasing the water in the biochemical tank 1;

Afterwards, when the amount of water inflow is large during the day, the excess discharge from the biochemical pool 1 is supplemented by increasing the amount of water inflow, so as to reach a balanced state.

It should be noted that, in the technical solutions of the embodiments of the present application,

The PLC automatic control system 6 first judges the liquid level of the MBR membrane pool 3, and when the liquid level of the MBR membrane pool 3 is lower than the first preset MBR membrane pool liquid level threshold, the movable electric weir gate 2 is opened to transfer more biochemical The water in pool 1 is put into MBR membrane pool 3, and combined with the liquid level drop rate of MBR membrane pool 3, the movable electric weir gate 2 is controlled, that is, the faster the liquid level of MBR membrane pool 3 drops, the movable electric weir gate 2 The greater the degree of opening of the membrane module, the greater the stability of the liquid level of the MBR membrane pool 3 while ensuring the maximum water outlet capacity of the membrane module;

In the later stage, the PLC automatic control system 6 obtains the water intake information of the water intake room 4, and when the water intake volume of the water intake room 4 reaches the first water intake threshold value, that is, when the water intake requirement is met or greater, the water intake pump 5 is turned on with a larger Power operation, that is, control the water inlet pump 5 to operate at the first operating power until the biochemical pool liquid level data of the biochemical pool 1 reaches the preset liquid level of the biochemical pool, and control the water inlet pump 5 to operate at the second operating power .

Finally, the movable electric weir door 2 is closed, and the biochemical pool 1 is discharged normally through the water outlet weir 10 of the biochemical pool.

Further, when the liquid level of the biochemical pool 1 is higher than the top surface of the biochemical pool outlet weir 10, the liquid in the biochemical pool 1 will flow into the opening on the top surface of the biochemical pool outlet weir 10, and then flow to The MBR membrane pool 3;

When the liquid level of the biochemical pool 1 is within the opening range of the movable electric weir door 2, by regulating the opening degree of the movable electric weir door 2, the liquid in the biochemical pool 1 is controlled to flow to the The rate of MBR membrane pool 3 is described above.

Further, the outlet weir 10 of the biochemical pool is arranged horizontally, and the outlet well 11 of the biochemical pool is arranged vertically.

Here, the structure of the outlet weir 10 of the biochemical pool is described in detail, as follows:

The biochemical pool outlet weir 10 is arranged on the inner wall of the biochemical pool 1;

The outlet weir 10 of the biochemical pool is provided with a top opening, and the side wall at one end is provided with a side wall opening, and the movable electric weir gate 2 is arranged on the side wall opening;

The bottom of the biochemical pool outlet weir 10 is connected with a biochemical pool outlet well 11, the top of the biochemical pool outlet well 11 is connected to the bottom of the biochemical pool outlet weir 10, and the bottom of the biochemical pool outlet well 11 is connected to the MBR. The membrane pool 3 is connected.

Specifically, the structure of the outlet weir 10 of the biochemical pool can be in the following form:

The outlet weir 10 of the biochemical pool is a container with an opening on the top, and a first opening is provided on the side wall, and the outlet weir 10 of the biochemical pool is arranged on the first opening for regulating the degree of opening of the first opening, That is, the first opening can be fully opened and gradually transformed into a fully covered state,

The bottom of the biochemical pool outlet weir 10 is connected with a biochemical pool outlet well 11, the top of the biochemical pool outlet well 11 is connected to the bottom of the biochemical pool outlet weir 10, and the bottom of the biochemical pool outlet well 11 is connected to the MBR. The membrane pool 3 is connected.

Generally speaking, the structure of the outlet weir 10 of the biochemical pool includes a bottom plate and no top plate, and includes a pair of first side plates along its length direction, one of the first side plates is arranged on the inner wall of the biochemical pool 1 , both ends include at least one second side plate, the other can be a second side plate with a side wall opening or no second side plate directly,

That is, when there is only one second side plate, the orientation where the other second side plate should be located is the orientation of the side wall opening.

Further, the sewage treatment system also includes:

The biochemical pool liquid level gauge 12 is used to monitor the liquid level of the biochemical pool 1, obtain the liquid level data of the biochemical pool and send it to the PLC automatic control system 6.

Further, the sewage treatment system also includes:

The MBR membrane tank liquid level gauge 30 is used to monitor the liquid level of the MBR membrane tank 3, obtain the MBR membrane tank liquid level data and send it to the PLC automatic control system 6.

Further, the sewage treatment system also includes:

Movable electric weir gate relay 20, which is connected with the PLC automatic control system 6 and the movable electric weir gate 2;

The PLC automatic control system 6 controls the opening degree of the movable electric weir gate 2 through the movable electric weir gate relay 20 .

Further, the sewage treatment system also includes:

Water inlet pump relay 50, which is connected with the PLC automatic control system 6 and the water inlet pump 5 signals;

The PLC automatic control system 6 controls the operating power of the water inlet pump 5 through the water inlet pump relay 50 .

Further, when the PLC automatic control system 6 controls the opening degree of the movable electric weir gate 2, the opening degree of the movable electric weir gate 2 is related to the MBR membrane tank liquid level data of the MBR membrane tank 3. One-to-one correspondence;

The first corresponding relationship is: Y=Z-X*2*100%; wherein,

X is the MBR membrane tank liquid level data of the MBR membrane tank 3, Y is the opening degree of the movable electric weir gate 2, and Z is the first preset MBR membrane tank liquid level threshold of the MBR membrane tank 3.

Further, the PLC automatic control system 6 is also used to control the water intake pump 5 to operate according to the first operating power when the water intake of the water intake room 4 reaches the first water intake threshold, until the biochemical pool 1 When the liquid level data of the biochemical pool reaches the preset liquid level of the biochemical pool, the water inlet pump 5 is controlled to operate at the second operating power.

Specifically, based on the technical solutions of the embodiments of the present application, the specific implementation process is as follows:

Step 1, when the water intake of the MBR membrane pool 3 is small, specifically lower than the first preset MBR membrane pool water intake threshold, the liquid level of the MBR membrane pool 3 is monitored, and the liquid level data of the MBR membrane pool 3 Transmitted to the PLC automatic control system 6.

Step 2, when the PLC automatic control system 6 judges that the liquid level of the MBR membrane tank 3 drops rapidly and is lower than the first preset MBR membrane tank liquid level threshold, the movable electric weir gate 2 is opened at this time;

Assume that the first preset MBR membrane tank liquid level threshold is 3.5m, and the first preset MBR membrane tank liquid level warning line is 3m, and the subsequent steps will be explained with this parameter;

When the current liquid level of the MBR membrane pool 3 is 3.4m, the movable electric weir gate 2 is opened;

The first preset MBR membrane tank liquid level threshold and the first preset MBR membrane tank liquid level warning line are related to the membrane size of the MBR membrane tank 3 and the factory settings.

Step 3, when the PLC automatic control system 6 judges that the current liquid level of the MBR membrane pool 3 is 3.4m, the movable electric weir gate 2 is opened, and the opening degree is 20%.

It should be noted that the movable electric weir gate 2 is a real-time adjustment device, and the relative ratio is that when the relative set water level drops by 0.1m, the opening degree of the weir gate increases by 20%. The relevant formula of the movable electric weir gate 2 can be set is Y=Z-X*2*100%; where,

X is the MBR membrane tank liquid level data of the MBR membrane tank 3, Y is the opening degree of the movable electric weir gate 2, and Z is the first preset MBR membrane tank liquid level threshold of the MBR membrane tank 3.

Step 4, the PLC automatic control system 6 continues to judge the liquid level of the MBR membrane pool 3, if it continues to drop, for example, to 3.3m, it indicates that the water replenishment of the biochemical pool 1 is insufficient.

Step five, when the amount of water replenished in the biochemical pool 1 is insufficient, the PLC automatic control system 6 controls the opening degree of the movable electric weir gate 2 to reach 40%.

Step 6, the PLC automatic control system 6 continues to judge the liquid level of the MBR membrane pool 3, and when the current liquid level can be stably maintained at 3.5m, the opening degree of the movable electric weir gate 2 is maintained;

In step seven, the PLC automatic control system 6 dynamically adjusts the opening degree of the movable electric weir gate 2 according to the liquid level of the MBR membrane pool 3 .

Step 8, when it is detected that the water intake of the water intake room 4 is large enough and exceeds the first water intake threshold, the PLC automatic control system 6 controls the water intake pump 5 to operate at the first increased power to increase the water intake, and at the same time estimate Monitor the liquid level of the biochemical pool 1;

The water intake of the water intake room 4 is the amount of water that can be supplied and treated at the front end of the water intake in the factory area. Only when the supply of the front end pipe network is sufficient can the water intake pump 5 be able to pump water at the first increased power.

Step 9, when the liquid level of the biochemical pool 1 reaches the first preset biochemical pool liquid level threshold, assuming that the first preset biochemical pool liquid level threshold is 7m, the PLC automatic control system 6 controls the water inlet pump 5 to decrease to the preset Set normal power operation.

Step ten, the PLC automatic control system 6 closes the movable electric weir gate 2, and the water outlet of the biochemical pool 1 is normally discharged through the water outlet weir 10 of the biochemical pool;

After the movable electric weir door 2 is closed, the original process is used for normal water discharge. The original process is a fixed water discharge method commonly used in the sewage treatment process. The biochemical tank 1 flows through the biochemical tank discharge weir 10 to the The biochemical pool comes out of the well 11.

In the above steps, by monitoring the liquid level of the MBR membrane pool 3 in real time, the water output of the biochemical pool 1 is intelligently adjusted through the movable electric weir gate 2, so as to maintain the stability of the biochemical pool 1;

If necessary, the volume of the biochemical pool 1 can also be changed to accommodate the water inflow fluctuating with time, and exchange space for time, so as to maximize the total amount of sewage treatment in the water plant;

The PLC automatic control system 6 is used to control the two sets of automatic water replenishment systems of the MBR membrane pool 3 and the biochemical pool 1, replacing the traditional manual control, which can achieve more accurate liquid level control and reduce the increase in labor costs;

No matter in the process of replenishing water to the MBR membrane pool 3 or from the process of replenishing water to the biochemical pool 1, the movable electric weir gate 2 is always in a state of dynamic adjustment, the main purpose of which is to maintain the stability of the liquid level of the MBR membrane pool 3;

When the MBR membrane pool 3 can normally discharge water through the biochemical pool outlet weir 10 to ensure the maximum processing capacity of the MBR membrane pool 3, the movable electric weir door 2 is no longer used for water outlet.

It should be noted that the technical solution of the embodiment of the present application can flexibly adjust the pool capacity of the biochemical pool 1 when the influent water quality fluctuates greatly, so as to intelligently replenish the MBR membrane pool 3 and maximize the treatment capacity of the water plant. Maximize economic benefits;

The power consumption of the traditional treatment method increases or the treatment capacity is not optimal. After adopting the intelligent water replenishment system, the labor cost can be greatly reduced, and at the same time, the drastic changes in the influent water can be reflected in time to improve the stability of the system.

In the second aspect, based on the same inventive concept as the first aspect, the embodiment of the present application provides a control method for a sewage treatment system, the method is based on the sewage treatment system mentioned in the first aspect, and the control method includes the following steps:

S1. When the liquid level of the MBR membrane tank 3 is lower than the first preset MBR membrane tank liquid level threshold, the PLC automatic control system 6 controls to open the movable electric weir gate 2;

S2. When the water intake in the water intake room 4 exceeds the first water intake threshold, the PLC automatic control system 6 controls the water intake pump 5 to operate at the first increased power;

S3. When the liquid level of the biochemical pool 1 reaches the first preset biochemical pool liquid level threshold, the PLC automatic control system 6 controls the water inlet pump 5 to reduce to a preset normal power operation.

It should be noted that the embodiment of the present application is based on a sewage treatment system, which includes:

Biochemical pool 1, a movable electric weir gate 2 is arranged on the biochemical pool 1, a biochemical pool outlet weir 10 is arranged on the inner wall of the biochemical pool 1, and the movable electric weir gate 2 is arranged on the biochemical pool outlet weir 10, The movable electric weir gate 2 is configured to change the cofferdam height and water outlet efficiency of the biochemical pool outlet weir 10 when it is opened or closed, and the bottom of the biochemical pool outlet weir 10 is connected to a biochemical pool outlet well 11;

MBR membrane pool 3, which communicates with the biochemical pool 1 through the well 11 of the biochemical pool;

Water inlet room 4, which communicates with the biochemical pool 1, and a water inlet pump 5 is arranged at the communication place between the biochemical pool 1 and the water inlet room 4;

PLC automatic control system 6, which is used to control the opening degree of the movable electric weir gate 2, thereby regulating the flow rate from the biochemical pool 1 to the MBR membrane pool 3, and is also used to control the operation of the water inlet pump 5 Power, so as to regulate the flow rate from the water inlet 4 to the biochemical pool 1, so that the liquid levels of the biochemical pool 1 and the MBR membrane pool 3 meet the corresponding preset liquid level requirements.

It should be noted that the maximum treatment and water output capacity of the sewage treatment system are realized by controlling the movable electric weir gate 2 and the water inlet pump 5 through the liquid level of the biochemical tank 1 and the MBR membrane tank 3 .

The sewage treatment system of the embodiment of the present application controls the height of the outlet weir 10 of the biochemical pool by installing the movable electric weir gate 2, and controls the opening and closing of the movable electric weir gate 2 and the degree of opening, thereby controlling the biochemical pool 1 The total amount of water output can meet the requirement of large flow of water when the water inflow is small, and meet the capacity requirements of the subsequent MBR membrane pool 3.

The embodiment of the present application monitors the liquid level height of the MBR membrane pool 3 in real time by adding a liquid level gauge at the MBR membrane pool 3;

When the water output is small due to the small amount of water inflow, the PLC automatic control system 6 issues an instruction to open the movable electric weir gate 2 to increase the water output of the biochemical pool to meet the processing capacity of the membrane pool;

When it is detected that the liquid level of the MBR membrane tank 3 exceeds the predetermined liquid level, the opening degree of the movable electric weir gate 2 is reduced to reduce the water output of the biochemical tank and maintain the balance of the liquid level of the membrane tank.

The embodiment of the present application also monitors the liquid level height of the biochemical pool 1 by adding a liquid level gauge in the biochemical pool 1. When the water supply capacity of the municipal pipe network is sufficient during the day and at the same time detects that the liquid level of the biochemical pool 1 is lower than the set liquid level, The PLC automatic control system 6 increases the power of the water inlet pump 5 to supplement the missing liquid level of the biochemical pool 1, and when the preset liquid level is reached, the water inlet pump 5 is adjusted to operate at normal power;

The treatment capacity can be flexibly adjusted when the influent fluctuates greatly, so as to maximize the utilization rate of the biochemical pool 1 and the utilization rate of the MBR membrane pool 3, and improve economic benefits.

In the embodiment of the present application, by adding a movable electric weir gate 2 to the biochemical pool outlet weir 10 of the biochemical pool 1, the lifting of the movable electric weir gate 2 is adjusted, thereby controlling the change of the overall liquid level of the biochemical pool 1, and then controlling the biochemical pool Changes in total water output;

It is mainly used in water plants where the water inflow varies greatly throughout the day. When the water inflow is small at night, it can maintain the water output to a certain amount by excessively releasing the water in the biochemical tank 1;

Afterwards, when the amount of water inflow is large during the day, the excess discharge from the biochemical pool 1 is supplemented by increasing the amount of water inflow, so as to reach a balanced state.

It should be noted that, in the technical solutions of the embodiments of the present application,

The PLC automatic control system 6 first judges the liquid level of the MBR membrane pool 3, and when the liquid level of the MBR membrane pool 3 is lower than the first preset MBR membrane pool liquid level threshold, the movable electric weir gate 2 is opened to transfer more biochemical The water in pool 1 is put into MBR membrane pool 3, and combined with the liquid level drop rate of MBR membrane pool 3, the movable electric weir gate 2 is controlled, that is, the faster the liquid level of MBR membrane pool 3 drops, the movable electric weir gate 2 The greater the degree of opening of the membrane module, the greater the stability of the liquid level of the MBR membrane pool 3 while ensuring the maximum water outlet capacity of the membrane module;

In the later stage, the PLC automatic control system 6 obtains the water intake information of the water intake room 4, and when the water intake volume of the water intake room 4 reaches the first water intake threshold value, that is, when the water intake requirement is met or greater, the water intake pump 5 is turned on with a larger Power operation, that is, control the water inlet pump 5 to operate at the first operating power until the biochemical pool liquid level data of the biochemical pool 1 reaches the preset liquid level of the biochemical pool, and control the water inlet pump 5 to operate at the second operating power .

Finally, the movable electric weir door 2 is closed, and the biochemical pool 1 is discharged normally through the water outlet weir 10 of the biochemical pool.

Further, when the liquid level of the biochemical pool 1 is higher than the top surface of the biochemical pool outlet weir 10, the liquid in the biochemical pool 1 will flow into the opening on the top surface of the biochemical pool outlet weir 10, and then flow to The MBR membrane pool 3;

When the liquid level of the biochemical pool 1 is within the opening range of the movable electric weir door 2, by regulating the opening degree of the movable electric weir door 2, the liquid in the biochemical pool 1 is controlled to flow to the The rate of MBR membrane pool 3 is described above.

Further, the outlet weir 10 of the biochemical pool is arranged horizontally, and the outlet well 11 of the biochemical pool is arranged vertically.

Here, the structure of the outlet weir 10 of the biochemical pool is described in detail, as follows:

The biochemical pool outlet weir 10 is arranged on the inner wall of the biochemical pool 1;

The outlet weir 10 of the biochemical pool is provided with a top opening, and the side wall at one end is provided with a side wall opening, and the movable electric weir gate 2 is arranged on the side wall opening;

The bottom of the biochemical pool outlet weir 10 is connected with a biochemical pool outlet well 11, the top of the biochemical pool outlet well 11 is connected to the bottom of the biochemical pool outlet weir 10, and the bottom of the biochemical pool outlet well 11 is connected to the MBR. The membrane pool 3 is connected.

Generally speaking, the structure of the outlet weir 10 of the biochemical tank includes a bottom plate, which may include a top plate with a top opening or no top plate, and a pair of first side plates along its length direction, one of the first side plates It is arranged on the inner wall of the biochemical pool 1, and both ends include at least one second side plate, and the other can be a second side plate with a side wall opening or no second side plate directly,

That is, when there is no top plate, the position where the top plate should be is the position of the top opening; when there is only one second side plate, the position where the other second side plate should be is the position of the side wall opening.

Further, the sewage treatment system also includes:

The biochemical pool liquid level gauge 12 is used to monitor the liquid level of the biochemical pool 1, obtain the liquid level data of the biochemical pool and send it to the PLC automatic control system 6.

Further, the sewage treatment system also includes:

The MBR membrane tank liquid level gauge 30 is used to monitor the liquid level of the MBR membrane tank 3, obtain the MBR membrane tank liquid level data and send it to the PLC automatic control system 6.

Further, the sewage treatment system also includes:

Movable electric weir gate relay 20, which is connected with the PLC automatic control system 6 and the movable electric weir gate 2;

The PLC automatic control system 6 controls the opening degree of the movable electric weir gate 2 through the movable electric weir gate relay 20 .

Further, the sewage treatment system also includes:

Water inlet pump relay 50, which is connected with the PLC automatic control system 6 and the water inlet pump 5 signals;

The PLC automatic control system 6 controls the operating power of the water inlet pump 5 through the water inlet pump relay 50 .

Further, when the PLC automatic control system 6 controls the opening degree of the movable electric weir gate 2, the opening degree of the movable electric weir gate 2 is related to the MBR membrane tank liquid level data of the MBR membrane tank 3. One-to-one correspondence;

The first corresponding relationship is: Y=Z-X*2*100%; wherein,

X is the MBR membrane tank liquid level data of the MBR membrane tank 3, Y is the opening degree of the movable electric weir gate 2, and Z is the first preset MBR membrane tank liquid level threshold of the MBR membrane tank 3.

Further, the PLC automatic control system 6 is also used to control the water intake pump 5 to operate according to the first operating power when the water intake of the water intake room 4 reaches the first water intake threshold, until the biochemical pool 1 When the liquid level data of the biochemical pool reaches the preset liquid level of the biochemical pool, the water inlet pump 5 is controlled to operate at the second operating power.

Specifically, based on the technical solutions of the embodiments of the present application, the specific implementation process is as follows:

Step 1, when the water intake of the MBR membrane pool 3 is small, specifically lower than the first preset MBR membrane pool water intake threshold, the liquid level of the MBR membrane pool 3 is monitored, and the liquid level data of the MBR membrane pool 3 Transmitted to the PLC automatic control system 6.

Step 2, when the PLC automatic control system 6 judges that the liquid level of the MBR membrane tank 3 drops rapidly and is lower than the first preset MBR membrane tank liquid level threshold, the movable electric weir gate 2 is opened at this time;

Assume that the first preset MBR membrane tank liquid level threshold is 3.5m, and the first preset MBR membrane tank liquid level warning line is 3m, and the subsequent steps will be explained with this parameter;

When the current liquid level of the MBR membrane pool 3 is 3.4m, the movable electric weir gate 2 is opened;

The first preset MBR membrane tank liquid level threshold and the first preset MBR membrane tank liquid level warning line are related to the membrane size of the MBR membrane tank 3 and the factory settings.

Step 3, when the PLC automatic control system 6 judges that the current liquid level of the MBR membrane pool 3 is 3.4m, the movable electric weir gate 2 is opened, and the opening degree is 20%.

It should be noted that the movable electric weir gate 2 is a real-time adjustment device, and the relative ratio is that when the relative set water level drops by 0.1m, the opening degree of the weir gate increases by 20%. The relevant formula of the movable electric weir gate 2 can be set is Y=Z-X*2*100%; where,

X is the MBR membrane tank liquid level data of the MBR membrane tank 3, Y is the opening degree of the movable electric weir gate 2, and Z is the first preset MBR membrane tank liquid level threshold of the MBR membrane tank 3.

Step 4, the PLC automatic control system 6 continues to judge the liquid level of the MBR membrane pool 3, if it continues to drop, for example, to 3.3m, it indicates that the water replenishment of the biochemical pool 1 is insufficient.

Step five, when the amount of water replenished in the biochemical pool 1 is insufficient, the PLC automatic control system 6 controls the opening degree of the movable electric weir gate 2 to reach 40%.

Step 6, the PLC automatic control system 6 continues to judge the liquid level of the MBR membrane pool 3, and when the current liquid level can be stably maintained at 3.5m, the opening degree of the movable electric weir gate 2 is maintained;

In step seven, the PLC automatic control system 6 dynamically adjusts the opening degree of the movable electric weir gate 2 according to the liquid level of the MBR membrane pool 3 .

Step 8, when it is detected that the water intake of the water intake room 4 is large enough and exceeds the first water intake threshold, the PLC automatic control system 6 controls the water intake pump 5 to operate at the first increased power to increase the water intake, and at the same time estimate Monitor the liquid level of the biochemical pool 1;

The water intake of the water intake room 4 is the amount of water that can be supplied and treated at the front end of the water intake in the factory area. Only when the supply of the front end pipe network is sufficient can the water intake pump 5 be able to pump water at the first increased power.

Step 9, when the liquid level of the biochemical pool 1 reaches the first preset biochemical pool liquid level threshold, assuming that the first preset biochemical pool liquid level threshold is 7m, the PLC automatic control system 6 controls the water inlet pump 5 to decrease to the preset Set normal power operation.

Step ten, the PLC automatic control system 6 closes the movable electric weir gate 2, and the water outlet of the biochemical pool 1 is normally discharged through the water outlet weir 10 of the biochemical pool;

After the movable electric weir door 2 is closed, the original process is used for normal water discharge. The original process is a fixed water discharge method commonly used in the sewage treatment process. The biochemical tank 1 flows through the biochemical tank discharge weir 10 to the The biochemical pool comes out of the well 11.

In the above steps, by monitoring the liquid level of the MBR membrane pool 3 in real time, the water output of the biochemical pool 1 is intelligently adjusted through the movable electric weir gate 2, so as to maintain the stability of the biochemical pool 1;

If necessary, the volume of the biochemical pool 1 can also be changed to accommodate the water inflow fluctuating with time, and exchange space for time, so as to maximize the total amount of sewage treatment in the water plant;

The PLC automatic control system 6 is used to control the two sets of automatic water replenishment systems of the MBR membrane pool 3 and the biochemical pool 1, replacing the traditional manual control, which can achieve more accurate liquid level control and reduce the increase in labor costs;

No matter in the process of replenishing water to the MBR membrane pool 3 or from the process of replenishing water to the biochemical pool 1, the movable electric weir gate 2 is always in a state of dynamic adjustment, the main purpose of which is to maintain the stability of the liquid level of the MBR membrane pool 3;

When the MBR membrane pool 3 can normally discharge water through the biochemical pool outlet weir 10 to ensure the maximum processing capacity of the MBR membrane pool 3, the movable electric weir door 2 is no longer used for water outlet.

It should be noted that in this application, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply There is no such actual relationship or order between these entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

The above are only specific implementation manners of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (10)

1. A sewage treatment system, the system comprising:

the biochemical pool (1), dispose a movable electric weir gate (2) on the biochemical pool (1), the inner wall of the biochemical pool (1) is provided with a biochemical pool water outlet weir (10), the movable electric weir gate (2) is set up on the biochemical pool water outlet weir (10), the movable electric weir gate (2) is disposed to change the cofferdam height and water outlet efficiency of the water outlet weir (10) of the biochemical pool when it is opened or closed, the bottom of the water outlet weir (10) of the biochemical pool is communicated with a biochemical pool well (11);

an MBR membrane tank (3) which is communicated with the biochemical tank (1) through the biochemical tank outlet (11);

a water inlet room (4) communicated with the biochemical tank (1), wherein a water inlet pump (5) is arranged at the communication part between the biochemical tank (1) and the water inlet room (4);

the PLC automatic control system (6) is used for controlling the opening degree of the movable electric weir gate (2), so as to regulate and control the flow rate of the biochemical tank (1) to the MBR membrane tank (3), and is also used for controlling the running power of the water inlet pump (5), so as to regulate and control the flow rate of the water inlet room (4) to the biochemical tank (1), and the liquid level conditions of the biochemical tank (1) and the MBR membrane tank (3) meet respective corresponding preset liquid level requirements.

2. The wastewater treatment system of claim 1, wherein:

when the liquid level of the biochemical tank (1) is higher than the top surface of the biochemical tank water outlet weir (10), the liquid in the biochemical tank (1) flows into an opening on the top surface of the biochemical tank water outlet weir (10) and then flows to the MBR membrane tank (3);

when the liquid level of the biochemical tank (1) is within the opening range of the movable electric weir gate (2), the opening degree of the movable electric weir gate (2) is regulated and controlled to control the speed of the liquid in the biochemical tank (1) flowing to the MBR membrane tank (3).

3. The wastewater treatment system of claim 1, wherein the system further comprises:

the biochemical pond water outlet weir (10) is horizontally arranged, and the biochemical pond water outlet well (11) is vertically arranged.

4. The wastewater treatment system of claim 1, wherein the system further comprises:

the biochemical pool liquid level meter (12) is used for monitoring the liquid level condition of the biochemical pool (1), obtaining biochemical pool liquid level data and sending the biochemical pool liquid level data to the PLC automatic control system (6).

5. The wastewater treatment system of claim 1, wherein the system further comprises:

and the MBR membrane tank liquid level meter (30) is used for monitoring the liquid level condition of the MBR membrane tank (3), obtaining MBR membrane tank liquid level data and sending the MBR membrane tank liquid level data to the PLC automatic control system (6).

6. The wastewater treatment system of claim 1, wherein the system further comprises:

a movable electric weir gate relay (20) in signal connection with the PLC (6) and the movable electric weir gate (2);

the PLC automatic control system (6) controls the opening degree of the movable electric weir gate (2) through the movable electric weir gate relay (20).

7. The wastewater treatment system of claim 1, wherein the system further comprises:

a water inlet pump relay (50) which is in signal connection with the PLC (6) and the water inlet pump (5);

the PLC automatic control system (6) controls the running power of the water inlet pump (5) through the water inlet pump relay (50).

8. The wastewater treatment system of claim 1, wherein:

when the PLC (programmable logic controller) automatic control system (6) controls the opening degree of the movable electric weir gate (2), the opening degree of the movable electric weir gate (2) and MBR membrane tank liquid level data of the MBR membrane tank (3) have a first corresponding relation;

the first corresponding relation is as follows: y= (Z-X) 2X 100%; wherein,,

x is MBR membrane tank liquid level data of the MBR membrane tank (3), Y is opening degree of the movable electric weir gate (2), and Z is a first preset MBR membrane tank liquid level threshold of the MBR membrane tank (3).

9. The wastewater treatment system of claim 1, wherein:

the PLC automatic control system (6) is further used for controlling the water inlet pump (5) to operate according to the first operation power when the water inflow of the water inlet room (4) reaches a first water inflow threshold value until the biochemical pool liquid level data of the biochemical pool (1) reaches a preset liquid level of the biochemical pool, and controlling the water inlet pump (5) to operate the second operation power.

10. A method of regulating a sewage treatment system according to claims 1-9, characterized in that the method comprises the steps of:

when the liquid level of the MBR membrane tank (3) is lower than a first preset MBR membrane tank liquid level threshold value, the PLC automatic control system (6) controls the movable electric weir gate (2) to be opened;

when the water inflow of the water inlet room (4) exceeds a first water inflow threshold value, the PLC automatic control system (6) controls the water inlet pump (5) to operate with a first increased power;

when the liquid level of the biochemical tank (1) reaches a first preset biochemical tank liquid level threshold, the PLC automatic control system (6) controls the water inlet pump (5) to be reduced to a preset normal power operation.