CN111533249A - MBR-based water production automatic control system - Google Patents
MBR-based water production automatic control system Download PDFInfo
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- CN111533249A CN111533249A CN202010344194.2A CN202010344194A CN111533249A CN 111533249 A CN111533249 A CN 111533249A CN 202010344194 A CN202010344194 A CN 202010344194A CN 111533249 A CN111533249 A CN 111533249A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 169
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 92
- 239000012528 membrane Substances 0.000 claims abstract description 100
- 239000007788 liquid Substances 0.000 claims abstract description 83
- 238000005273 aeration Methods 0.000 claims abstract description 69
- 238000010926 purge Methods 0.000 claims description 38
- 238000000926 separation method Methods 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 4
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 230000003111 delayed effect Effects 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005086 pumping Methods 0.000 description 8
- 238000004140 cleaning Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/006—Regulation methods for biological treatment
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to an MBR-based water production automatic control system, which comprises: the water production pump running system comprises a pulse aeration subsystem and a vacuumizing subsystem; a water production pump in the water production pump operation system operates according to the function of the MBR membrane group, and the water production amount is determined by the liquid level of the membrane pool; the vacuumizing subsystem enables a water producing pump in the water producing pump running system to run in an air-free state; the pulse aeration subsystem is used for controlling the MBR membrane group to keep vibrating. The invention meets the water production requirement of MBR, and has clear control flow and simple and effective control effect.
Description
Technical Field
The invention relates to the field of automatic control of sewage treatment, in particular to an automatic water production control system based on MBR.
Background
MBR sewage treatment is a common mode of modern sewage treatment, adopts a Membrane Bioreactor (MBR) technology, is a new technology combining a biological treatment technology and a membrane separation technology, replaces a secondary sedimentation tank in the traditional technology, and can efficiently carry out solid-liquid separation to obtain directly used stable reclaimed water. But also can maintain high-concentration microorganism biomass in the biological tank, the process has less excess sludge, extremely effectively removes ammonia nitrogen, the suspended matters and turbidity of the effluent are close to zero, bacteria and viruses in the effluent are greatly removed, the energy consumption is low, and the occupied area is small. Therefore, it is necessary to develop a full-automatic water production control system used with MBR.
Disclosure of Invention
The invention aims to solve the technical problem of providing an MBR-based water production automatic control system, which meets the water production requirement of MBR, and has clear control flow and simple and effective control effect.
The technical scheme adopted by the invention for solving the technical problems is as follows: there is provided an MBR-based automatic water production control system, comprising: the water production pump running system comprises a pulse aeration subsystem and a vacuumizing subsystem; a water production pump in the water production pump operation system operates according to the function of the MBR membrane group, and the water production flow is determined by the liquid level of the membrane pool; the vacuumizing subsystem enables a water producing pump in the water producing pump running system to run in an air-free state; the pulse aeration subsystem is used for controlling the MBR membrane group to keep vibrating.
When a water producing pump in the water producing pump running system is in a running state, a water producing pneumatic valve is opened, a CIP pneumatic valve is closed, and an aeration bypass valve is opened;
after a water producing pump in the water producing pump running system runs for X minutes, stopping running for Y minutes, and running circularly; when the water producing pump is in the state of stopping for Y minutes, the water producing valve is not closed;
controlling the running flow of the water producing pump through a feedback signal of a static pressure liquid level meter; when the liquid level of the membrane pool water inlet channel is in a set liquid level interval, the water production pump operates at constant flow according to a given flow PID; when the liquid level of the water inlet channel of the membrane pool is at the ultralow alarm liquid level, the water production pump group stops producing water; when the liquid level of the water inlet channel of the membrane pool is in the middle liquid level, the water production pump set automatically recovers to operate to produce water;
when the internal liquid level in the gas-water separation tank in front of the water producing pump is above the liquid level of the bass fork, the water producing pump operates; and when the internal liquid in the gas-water separation tank is lower than the liquid level of the bass fork and the duration time is more than 5 minutes, indicating that the gas-water separation tank is lack of water, stopping the water production pump from running and giving an alarm until the liquid level in the gas-water separation tank is more than the liquid level of the bass fork, and recovering the water production by the water production pump.
Before the water production pump in the water production pump operation system operates, confirming that a membrane purging blower is in an operation state and the air volume value is above a preset value; when the water production pump operates, if the number of the membrane purging blowers is less than a preset value or the air volume value is lower than the preset value, an alarm is given, and if the air volume value continues to be reduced, the operation of the water production pump is stopped.
The pulse aeration subsystem is provided with a pipe diameter bypass and an aeration bypass valve in each membrane pool air pipe bypass; a purging main pipe valve and a manual regulating valve are arranged on each membrane pool air branch pipe; by sequentially increasing the aeration pressure of each membrane pool, the air flow is distributed to the pipe diameter bypass with small resistance in turn, so that the periodic high-low cyclic pulse aeration among the membrane pools is realized;
if the membrane pulse aeration subsystem is in a low aeration state, closing the purging main pipe valve and opening the aeration bypass valve; if the high aeration state is achieved, the purging main pipe valve and the aeration bypass valve are opened;
when all galleries normally operate, opening a first membrane pool purging main pipe valve, keeping the galleries in a high aeration state, and closing the purging main pipe valve after maintaining the preset time; and then opening a second membrane pool purging trunk valve to enable each gallery to be in a high aeration state in turn, and opening the first membrane pool again after the second membrane pool is closed, so that the first membrane pool is operated circularly, and automatic control is realized.
In the membrane pulse aeration subsystem, in the process of switching the membrane tank from the high aeration state to the low aeration state, the high aeration pneumatic valve is closed after delaying for 5 seconds, or the high aeration pneumatic valve is closed after delaying to detect the opening signal of a second membrane tank purging main pipe valve through the closing signal of the purging main pipe valve in the membrane tank; and if the electric control system does not detect the opening or closing signal of the purging main pipe valve in the second membrane pool within 10 seconds after the high-aeration pneumatic valve is given out the opening or closing signal, skipping over the second membrane pool, directly entering a third membrane pool for high-aeration treatment, and giving an alarm until the purging main pipe valve in the skipped second membrane pool is detected to be opened or closed, and removing the alarm.
The vacuumizing subsystem is controlled by a PLC to automatically operate and is controlled by a vacuumizing pneumatic butterfly valve in the gas-water separation tank;
if the liquid level in the vacuum tank in the vacuumizing subsystem reaches a preset high level, the liquid ring vacuum pump automatically stops running, an inlet pneumatic valve of the vacuum tank is automatically closed, and an exhaust pneumatic valve and a drainage pneumatic valve are opened after C seconds of delay; if the liquid level in the vacuum tank reaches a preset low level, automatically closing an air discharging pneumatic valve and a water discharging pneumatic valve, and opening an inlet pneumatic valve and a liquid ring vacuum pump after delaying for C seconds, so that the vacuumizing subsystem recovers to a normal operation state;
if the liquid level in the vacuum tank reaches a preset high level, automatically closing an inlet pneumatic valve of the vacuum tank, and opening an exhaust pneumatic valve and a drainage pneumatic valve after delaying C seconds; and if the liquid level in the vacuum tank reaches a preset low level, automatically closing the air discharging pneumatic valve and the water discharging pneumatic valve, and opening the inlet pneumatic valve after delaying C seconds, so that the vacuumizing subsystem is in a standby state.
Among the evacuation subsystem, when the tuning fork level gauge in arbitrary product waterline was in predetermineeing the low level and time exceeded 30 seconds, evacuation pneumatic valve opens until the tuning fork level gauge reachs and predetermines the high level, if evacuation time surpasses 5 minutes and does not reach and predetermine the high level, then reports to the police.
Advantageous effects
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects: the full-automatic flow control method for MBR water production meets the MBR water production requirement, has clear control flow and simple and effective control effect, modularizes programs through the system, reduces the workload of programming and debugging personnel during debugging, and is convenient to maintain during operation.
Drawings
FIG. 1 is a system block diagram of an embodiment of the present invention;
fig. 2 is a system schematic of an embodiment of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
An embodiment of the present invention relates to an automatic control system for water production based on MBR, which is a system structure diagram in an embodiment of the present invention, as shown in fig. 1, and the automatic control system for water production based on MBR in the embodiment includes a water production pump operation system, a vacuum pumping subsystem and a pulse aeration subsystem.
Fig. 2 is a schematic diagram of a system in an embodiment of the present invention, and it can be seen from fig. 2 that the layout of the devices in the coordinated operation of the three subsystems is reasonable, so that the embodiment can operate more efficiently.
The system of the embodiment has 4 series, each series comprises 1 set of water production pumping system, and each set of water production system corresponds to 1 water production pump, 1 gas-water separation tank (water production special equipment and comprises two tuning fork level meters), 1 pressure transmitter, 1 electromagnetic flowmeter and corresponding pneumatic valve accessories. 4 sets of water producing systems share the vacuum pumping system.
In this embodiment, the MBR-based water production automatic control system comprises a plurality of subsystems, namely a water production pump operation system, a vacuum pumping subsystem and a pulse aeration subsystem. When water production is started, the three subsystems run simultaneously, a water production pump in the water production pump running system runs according to the function of the MBR membrane group, and the water production flow is determined by the liquid level of the membrane pool; a gas-water separation tank (water production special equipment) in front of the water production pump cannot be in a state of low water yield for a long time, and the water production pump operates without air through the vacuum pumping subsystem; MBR membranes need to keep vibrating, corresponding membrane groups need to operate the pulse aeration subsystem, and otherwise the MBR membranes are easy to block.
First, produce water pump operation system control principle
When each water producing pump of the membrane water producing system is in an operating state, the water producing pneumatic valve is opened, the CIP pneumatic valve of the cleaning system is closed, and the aeration bypass valve is opened; in the embodiment, the water production pump is started for 7 minutes and stopped for 1 minute, and the operation is circulated. At 1 minute down time, the water production valve did not close, but had to be in place to produce water. The operation flow of the water producing pump is controlled by a feedback signal of a static pressure liquid level meter in the membrane pool; preferably, the liquid level of the membrane pool in the embodiment is set to be 7-level liquid level, when the liquid level of the water inlet channel of the membrane pool is in a set interval, the water production pump operates according to given flow PID constant flow, the membrane pool step liquid level corresponds to the membrane water production step water yield, and the higher the liquid level is, the larger the water yield is; when the liquid level of the water inlet channel of the membrane pool is at the ultralow alarm liquid level, all the water production pump sets stop producing water; when the liquid level is restored to the 'middle liquid level', the water production pump automatically restores to operate to produce water.
The membrane purging blower is interlocked with the water production pump, and before the water production pump operates, the membrane purging blower is in an operating state and the air volume value is above a preset value; when the water production pump operates, if the number of the membrane blowing blowers is smaller than a preset value (manually set), or the air volume value is lower than the preset value, an alarm is given, and if the air volume value continues to be reduced, the operation of the water production pump is stopped.
In the embodiment, when the internal liquid level in the gas-water separation tank (special water production equipment) is above the liquid level of the bass fork, the water production pump operates; when the internal liquid in the gas-water separation tank is lower than the liquid level of the bass fork and the duration time is more than 5 minutes, indicating that the gas-water separation tank is lack of water, stopping the operation of the water production pump and giving an alarm until the liquid level in the gas-water separation tank is more than the liquid level of the bass fork, and recovering the water production by the water production pump.
In the embodiment, when the transmembrane pressure TMP exceeds 35kPa, an alarm is given; when transmembrane pressure difference TMP exceeds 50kPa, stopping the operation of the water production pump;
when the sludge concentration exceeds a preset value, alarming; when the aeration bypass valve (DN150) and the purging main pipe valve (DN350) are both closed, an alarm is given and the operation of the water production pump is stopped.
Preferably, in the embodiment, (1) when the liquid level of the membrane pool reaches an ultrahigh liquid level (3.6m) or an ultralow liquid level (3.0m), the central control chamber gives an audible and visual alarm, and the alarm responds: the alarm is automatically released after the liquid level is restored, and the alarm can be manually released after the fault is manually confirmed to be eliminated; (2) the liquid level (3.3m) in the membrane pool is a water production pump starting signal; (3) the ultra-low liquid level (3.0m) of the membrane pool is a signal for stopping the pump of the water producing pump; (4) and recording the running time of each gallery at the middle-high liquid level, the high liquid level and the ultrahigh liquid level, and giving an alarm when the accumulated time exceeds 4 hours.
Control principle of pulse aeration subsystem
In the embodiment, each membrane pool air pipe bypass is provided with a small-caliber bypass and an aeration bypass valve (DN 150); and a purging main pipe valve (DN350) and a manual regulating valve are arranged on each membrane pool air branch pipe.
If the pulse aeration subsystem is in a low aeration state, closing the purging main pipe valve and opening the aeration bypass valve; if the air conditioner is in a high aeration state, opening a purging main pipe valve and an aeration bypass valve; each membrane tank in turn performs an "on/off" purge trunk valve for high aeration. The bypass valve is normally open, and when the cleaning system is cleaned by CIP, the aeration bypass valve is closed. The principle of the redistribution of the gas volume in each membrane pool is as follows: namely, the aeration pressure of each membrane pool is sequentially increased, the air flow wheel is distributed to pipelines with small resistance, and the periodic high-low cyclic pulse aeration among the membrane pools is realized.
In the embodiment, when all galleries normally operate, the A1 membrane pool purging main pipe valve (DN350) is opened, the membrane gallery is in a high aeration state, the membrane gallery is maintained for 3-5 minutes (time is adjustable), and the purging main pipe valve (DN350) is closed. And opening an A2 membrane pool purging trunk valve (DN350), and in the same way, enabling each gallery to be in a high aeration state in turn, opening the A1 membrane pool again after closing the A2 membrane pool, and starting a new cycle to realize automatic control.
When a certain membrane pool needs CIP cleaning, the membrane pool jumps over the gallery and directly opens the membrane purging main pipe valve corresponding to the next gallery.
Further, in this embodiment, in order to avoid the impact of air volume distribution when the pneumatic valve is switched, in the process of switching the membrane pool from high aeration to low aeration, the high aeration pneumatic valve is turned off with a delay of 5 seconds (or the membrane pool purging main pipe valve is turned off after the delay of the turn-off signal until the turn-on signal of the next membrane pool purging main pipe valve is detected); and if the electronic control system does not detect the opening or closing signal of the purging main pipe valve of the next membrane pool (marked as a second membrane pool) within 10 seconds after the high aeration pneumatic valve is given out the opening or closing signal, skipping the group, directly entering a third membrane pool for high aeration, and giving an alarm until the opening or closing signal of the purging main pipe valve of the just skipped membrane pool is detected, and removing the alarm.
When the cleaning system is cleaned by CIP, the high-low aeration pneumatic valves of the membrane tank are all closed. When there is a cleaning system CIP cleaning in the membrane tank, the high aeration cycle skips the membrane tank being cleaned.
Control principle of vacuumizing subsystem
In this embodiment, the water production system has 1 set of vacuum pumping system, which includes 2 liquid ring vacuum pumps (1 of which is spare), 1 vacuum tank, 1 gas-water separation tank, and corresponding pneumatic butterfly valve, solenoid valve and other valves.
Under normal conditions, the vacuumizing system is automatically operated under the control of a PLC and is controlled by a vacuumizing pneumatic butterfly valve (with the valve in place) at the upper part of the gas-water separation tank.
In the embodiment, when a tuning fork liquid level meter in any production line special equipment is at a low position for more than 30 seconds, a vacuumizing pneumatic valve at the upper part of the equipment is opened until the tuning fork liquid level meter reaches a high position for displaying, and if the vacuumizing state exceeds 5 minutes, the tuning fork liquid level meter still does not reach the high position, an alarm is given.
When the vacuumizing subsystem operates, the liquid ring vacuum pump, the vacuumizing pneumatic butterfly valve and the inlet pneumatic valve are all in an open state, if the liquid ring vacuum pump, the vacuumizing pneumatic butterfly valve and the inlet pneumatic valve cannot be opened, an alarm is given, and all corridor vacuum valves corresponding to the liquid ring vacuum pump, the vacuumizing pneumatic butterfly valve and the inlet pneumatic valve are closed.
The water replenishing electric ball valve in the embodiment is started three times (manually settable) every day in an intermittent operation mode, and water is replenished for 20 seconds (manually settable) every time.
When the liquid ring vacuum pump works, when the liquid level (tuning fork liquid level meter) in the vacuum tank reaches a high level, the liquid ring vacuum pump automatically stops running, the pneumatic valve at the inlet of the vacuum tank is closed, and the exhaust pneumatic valve and the drainage pneumatic valve are opened after 1-2 seconds of delay; when the liquid level of the vacuum tank reaches a low level, the air discharging pneumatic valve and the water discharging pneumatic valve are automatically closed, the inlet pneumatic valve and the vacuum pump are opened after 1-2 seconds of delay, and the vacuum pumping system recovers to a normal working state.
When the vacuumizing subsystem stops, 1: when the liquid level of the vacuum tank reaches a high level, automatically closing an inlet pneumatic valve of the vacuum tank, and delaying for 1-2 seconds to open an exhaust pneumatic valve and a drainage pneumatic valve; 2: when the liquid level of the vacuum tank reaches a low level, the air discharging pneumatic valve and the water discharging pneumatic valve are automatically closed, the time delay is 1-2 seconds, the air inlet pneumatic valve is opened, and the vacuumizing system is in a standby state. It is to be noted here that: if the membrane pool is in a cleaning state, vacuum pumping is not allowed.
In the embodiment, when the number of galleries which need to be vacuumized at the same time exceeds 2, the standby liquid ring vacuumizing pump is started.
Therefore, the automatic control system based on MBR water production not only meets the MBR water production requirement, makes the control flow clearer, but also has modularized program and reduces the debugging workload.
Claims (7)
1. An MBR-based water production automatic control system, comprising: the water production pump running system comprises a pulse aeration subsystem and a vacuumizing subsystem; a water production pump in the water production pump operation system operates according to the function of the MBR membrane group, and the water production flow is determined by the liquid level of the membrane pool; the vacuumizing subsystem enables a water producing pump in the water producing pump running system to run in an air-free state; the pulse aeration subsystem is used for controlling the MBR membrane group to keep vibrating.
2. The MBR-based water production automatic control system according to claim 1, wherein when the water production pump in the water production pump operating system is in an operating state, the water production pneumatic valve is opened, the CIP pneumatic valve is closed, and the aeration bypass valve is opened;
after a water producing pump in the water producing pump running system runs for X minutes, stopping running for Y minutes, and running circularly; when the water producing pump is in the state of stopping for Y minutes, the water producing valve is not closed;
controlling the running flow of the water producing pump through a feedback signal of a static pressure liquid level meter; when the liquid level of the membrane pool water inlet channel is in a set liquid level interval, the water production pump operates at constant flow according to a given flow PID; when the liquid level of the water inlet channel of the membrane pool is at the ultralow alarm liquid level, the water production pump group stops producing water; when the liquid level of the water inlet channel of the membrane pool is in the middle liquid level, the water production pump set automatically recovers to operate to produce water;
when the internal liquid level in the gas-water separation tank in front of the water producing pump is above the liquid level of the bass fork, the water producing pump operates; and when the internal liquid in the gas-water separation tank is lower than the liquid level of the bass fork and the duration time is more than 5 minutes, indicating that the gas-water separation tank is lack of water, stopping the water production pump from running and giving an alarm until the liquid level in the gas-water separation tank is more than the liquid level of the bass fork, and recovering the water production by the water production pump.
3. The MBR-based water production automatic control system according to claim 1, wherein before the water production pump in the water production pump operating system is operated, it is determined that a membrane purge blower is in an operating state and an air volume value is above a preset value; when the water production pump operates, if the number of the membrane purging blowers is less than a preset value or the air volume value is lower than the preset value, an alarm is given, and if the air volume value continues to be reduced, the operation of the water production pump is stopped.
4. The MBR-based water production automatic control system of claim 1, wherein the pulse aeration subsystem is provided with a pipe diameter bypass and an aeration bypass valve at each membrane basin air pipe bypass; a purging main pipe valve and a manual regulating valve are arranged on each membrane pool air branch pipe; by sequentially increasing the aeration pressure of each membrane pool, the air flow is distributed to the pipe diameter bypass with small resistance in turn, so that the periodic high-low cyclic pulse aeration among the membrane pools is realized;
if the membrane pulse aeration subsystem is in a low aeration state, closing the purging main pipe valve and opening the aeration bypass valve; if the high aeration state is achieved, the purging main pipe valve and the aeration bypass valve are opened;
when all galleries normally operate, opening a first membrane pool purging main pipe valve, keeping the galleries in a high aeration state, and closing the purging main pipe valve after maintaining the preset time; and then opening a second membrane pool purging trunk valve to enable each gallery to be in a high aeration state in turn, and opening the first membrane pool again after the second membrane pool is closed, so that the first membrane pool is operated circularly, and automatic control is realized.
5. The MBR-based automatic water production control system according to claim 1, wherein in the membrane pulse aeration subsystem, the high aeration pneumatic valve is delayed for 5 seconds and then closed during the process of switching the membrane tank from the high aeration state to the low aeration state, or the high aeration pneumatic valve is delayed for 5 seconds until a second membrane tank purge main valve opening signal is detected and then closed; and if the electric control system does not detect the opening or closing signal of the purging main pipe valve in the second membrane pool within 10 seconds after the high-aeration pneumatic valve is given out the opening or closing signal, skipping over the second membrane pool, directly entering a third membrane pool for high-aeration treatment, and giving an alarm until the purging main pipe valve in the skipped second membrane pool is detected to be opened or closed, and removing the alarm.
6. The MBR-based water production automatic control system of claim 1, wherein the vacuum subsystem is automatically operated by PLC control and is controlled by a vacuum pneumatic butterfly valve in the gas-water separation tank;
if the liquid level in the vacuum tank in the vacuumizing subsystem reaches a preset high level, the liquid ring vacuum pump automatically stops running, an inlet pneumatic valve of the vacuum tank is automatically closed, and an exhaust pneumatic valve and a drainage pneumatic valve are opened after C seconds of delay; if the liquid level in the vacuum tank reaches a preset low level, automatically closing an air discharging pneumatic valve and a water discharging pneumatic valve, and opening an inlet pneumatic valve and a liquid ring vacuum pump after delaying for C seconds, so that the vacuumizing subsystem recovers to a normal operation state;
if the liquid level in the vacuum tank reaches a preset high level, automatically closing an inlet pneumatic valve of the vacuum tank, and opening an exhaust pneumatic valve and a drainage pneumatic valve after delaying C seconds; and if the liquid level in the vacuum tank reaches a preset low level, automatically closing the air discharging pneumatic valve and the water discharging pneumatic valve, and opening the inlet pneumatic valve after delaying C seconds, so that the vacuumizing subsystem is in a standby state.
7. The MBR-based water production automatic control system of claim 1, wherein in the vacuumizing subsystem, when a tuning fork level gauge in any water production line is at a preset low position for more than 30 seconds, the vacuumizing pneumatic valve is opened until the tuning fork level gauge reaches a preset high position, and if the vacuumizing time is more than 5 minutes and the preset high position is not reached, an alarm is given.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112456731A (en) * | 2020-11-13 | 2021-03-09 | 苏州弘毅环境科技有限公司 | Sewage treatment control method and system based on MBR process |
| CN112520946A (en) * | 2020-11-13 | 2021-03-19 | 苏州弘毅环境科技有限公司 | Reclaimed water reuse treatment control method and system based on MBR and RO process |
| CN114477429A (en) * | 2022-01-17 | 2022-05-13 | 中信环境技术（广州）有限公司 | Method and storage medium for controlling membrane pollution of MBR (membrane bioreactor) sewage treatment system |
| CN116924519A (en) * | 2023-06-14 | 2023-10-24 | 江苏道科环境科技有限公司 | Efficient automatic control method and system for immersed ultrafiltration membrane |
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| CN112456731A (en) * | 2020-11-13 | 2021-03-09 | 苏州弘毅环境科技有限公司 | Sewage treatment control method and system based on MBR process |
| CN112520946A (en) * | 2020-11-13 | 2021-03-19 | 苏州弘毅环境科技有限公司 | Reclaimed water reuse treatment control method and system based on MBR and RO process |
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| CN116924519A (en) * | 2023-06-14 | 2023-10-24 | 江苏道科环境科技有限公司 | Efficient automatic control method and system for immersed ultrafiltration membrane |
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