CN112456731B - Sewage treatment control method and system based on MBR process - Google Patents
Sewage treatment control method and system based on MBR process Download PDFInfo
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- CN112456731B CN112456731B CN202011272457.XA CN202011272457A CN112456731B CN 112456731 B CN112456731 B CN 112456731B CN 202011272457 A CN202011272457 A CN 202011272457A CN 112456731 B CN112456731 B CN 112456731B
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
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Abstract
The application relates to a sewage treatment control method and system based on an MBR process, which belong to the technical field of sewage treatment, and the method comprises the following steps: determining the number of parallel work of the MBR membranes based on the preset MBR unit time processing requirement and the unit time processing capacity of a single MBR membrane; setting a plurality of MBR basic membrane groups in an MBR pool according to the specified starting-stopping time length ratio of the MBR membranes and the number of the parallel work, wherein the total processing capacity per unit time of the plurality of MBR basic membrane groups is larger than the processing requirement per unit time of the MBR; and controlling the plurality of MBR basic membrane groups to enter a pause period in turn, and setting an MBR additional membrane group in the MBR tank to replace the paused MBR basic membrane group to execute MBR treatment. By adopting the method and the device, the starting and stopping requirements of the MBR membrane can be met, the service life of the water pump can be prolonged, and energy consumption caused by repeated starting and stopping of the water pump is saved.
Description
Technical Field
The application relates to the technical field of sewage treatment, in particular to a sewage treatment control method and system based on an MBR process.
Background
The MBR process is a novel sewage treatment technology organically combining a membrane separation technology and a biotechnology, and mainly utilizes an MBR membrane to filter activated sludge and macromolecular organic matters in sewage so as to solve the problems of the traditional activated sludge filtering method.
In the sewage treatment process based on the MBR process, raw sewage is firstly introduced into the regulating reservoir for concentration flow control, then introduced into the reaction reservoir, added with a sewage treatment agent for chemical reaction, and then introduced into the primary sedimentation reservoir for sludge sedimentation, and the supernatant after sedimentation is introduced into the biochemical reservoir so as to degrade and remove pollutants in the sewage by using microorganisms. And then, further treating the sewage by using an MBR (membrane bioreactor) tank and realizing sludge-water separation (which can be called as MBR treatment), pumping the sewage into an MBR water producing tank by using a water producing pump of the MBR tank, pumping the sewage into a cartridge filter by using a first-stage booster pump of the MBR water producing tank, and pumping the sewage into reverse osmosis equipment by using a second-stage booster pump. And finally, further filtering by reverse osmosis equipment to obtain final recyclable water and dischargeable water.
In the process of implementing the present application, the inventor finds that the prior art has at least the following problems:
according to the process control requirement, the MBR membrane needs to enter a certain pause time period after continuously working for a period of time, and then can start to work again. Correspondingly, in order to cooperate with the above start-stop conditions of the MBR membrane, the water producing pump of the MBR tank, the primary booster pump of the MBR water producing tank and the secondary booster pump of the security filter need to be synchronously controlled according to the start-stop state of the MBR membrane, so that the repeated start-stop of a plurality of water pumps can greatly reduce the service life of the water pumps and save more energy.
Disclosure of Invention
In order to prolong the service life of a water pump in a sewage treatment process and reduce energy consumption, the embodiment of the application provides a sewage treatment control method and a sewage treatment control system based on an MBR (membrane bioreactor) process. The technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a sewage treatment control method based on an MBR process, the method including:
determining the number of parallel work of the MBR membranes based on the preset MBR unit time processing requirement and the unit time processing capacity of a single MBR membrane;
setting a plurality of MBR basic membrane groups in an MBR pool according to the specified starting-stopping time length ratio of the MBR membranes and the number of the parallel work, wherein the total processing capacity per unit time of the plurality of MBR basic membrane groups is larger than the processing requirement per unit time of the MBR;
and controlling the plurality of MBR basic membrane groups to enter a pause period in turn, and setting an MBR additional membrane group in the MBR tank to replace the paused MBR basic membrane group to execute MBR treatment.
Based on above-mentioned technical scheme, realized that MBR basic membrane group and MBR additional membrane group pause in turn, MBR pond continuous operation, a plurality of water pumps such as the product water pump in MBR pond can last the operation, need not to open and shut repeatedly, both can satisfy the start-stop requirement of MBR membrane, can improve the life of water pump again, saved the energy resource consumption who brings because of the water pump is repeatedly opened and shut and is stopped.
Optionally, the setting a plurality of MBR basic membrane groups according to the specified on-off time ratio of the MBR membranes and the number of parallel-connected works includes:
determining the designated start-stop time length of the MBR membrane as the number of MBR basic membrane groups according to an integer m obtained by rounding down;
and dividing the parallel work number by the integer m to obtain the number of MBR membranes in each MBR basic membrane group.
Based on the technical scheme, the sewage treatment requirement of the MBR tank can be met, and the utilization rate of each MBR membrane group can be effectively ensured.
Optionally, the controlling the plurality of MBR basic membrane groups to alternately enter the pause period, and setting an MBR additional membrane group to replace the stopped MBR basic membrane group to perform MBR processing includes:
controlling pause periods of the plurality of MBR basic membrane groups not to overlap with each other;
setting an MBR additional membrane group so that the unit time treatment capacity of the MBR additional membrane group is equal to that of the single MBR basic membrane group;
when the target MBR basic membrane group enters a pause period, introducing sewage corresponding to the target MBR basic membrane group into the MBR additional membrane group.
Based on the technical scheme, the MBR additional membrane group is used for replacing each suspended MBR basic membrane group, so that the MBR treatment for sewage can be accurately performed at a constant speed.
Optionally, the controlling the plurality of MBR basic membrane groups to alternately enter the pause period, and setting an MBR additional membrane group to replace the stopped MBR basic membrane group to perform MBR processing includes:
setting an MBR additional membrane group so that the unit time treatment capacity of the MBR additional membrane group is equal to that of the single MBR basic membrane group;
controlling the pause periods of the plurality of MBR basic membrane groups and the MBR additional membrane groups to be sequentially connected end to end;
when a first MBR membrane group enters a pause period and a second MBR membrane group enters a working period, introducing sewage corresponding to the first MBR membrane group into the second MBR membrane group, wherein the first MBR membrane group and the second MBR membrane group are any one of the MBR basic membrane group or the MBR additional membrane group.
Based on the technical scheme, the MBR basic membrane group and the MBR additional membrane group sequentially enter the pause time period, the control logic of the MBR membrane group is set to be clearer, and the MBR treatment on sewage can be guaranteed to be executed at a constant speed.
Optionally, the method further includes:
and when the unit time processing requirement of the MBR is increased, increasing the number of MBR membranes contained in each MBR basic membrane group and MBR additional membrane group according to the requirement increase amount and the unit time processing amount of a single MBR membrane.
Based on the technical scheme, the MBR membrane number adjustment contained in each MBR membrane group can be quickly and conveniently completed according to actual needs.
Optionally, the method further includes:
and controlling a water production pump of the MBR tank to pump the sewage treated by the MBR into the security filter at a constant speed.
Based on the technical scheme, the MBR temporary membrane group is arranged, and the cleaning treatment of the MBR basic membrane group can be completed on the premise of not influencing the MBR treatment.
Optionally, the method further includes:
and controlling a booster pump of the cartridge filter based on the pumping power of a water production pump of the MBR tank, and pumping sewage from the cartridge filter into reverse osmosis equipment.
Based on the technical scheme, the engineering investment of the MBR water producing tank and the equipment investment of the primary booster pump matched with the MBR water producing tank are saved, and the cost of the sewage treatment process can be jointly saved from two aspects of engineering investment and treatment flow while the sewage treatment quality is not influenced.
Optionally, the method further includes:
after a preset membrane group cleaning condition is met, cleaning a target MBR membrane group in a pause period corresponding to the target MBR membrane group, wherein the target MBR membrane group is the MBR additional membrane group or any one of the MBR basic membrane groups.
Based on the technical scheme, the MBR membrane group is cleaned in the pause time period, and the MBR membrane group can be cleaned simultaneously on the premise of not influencing the MBR treatment.
Optionally, the method further includes:
periodically counting the total working time of each MBR basic membrane group;
and performing task replacement on the MBR basic membrane group with the longest total working time and the MBR additional membrane group.
Based on the technical scheme, the damage rates of the MBR basic membrane group and the MBR additional membrane group can be synchronized to a certain degree, and the utilization rate of the MBR additional membrane group is improved.
In a second aspect, an embodiment of the present application further provides a wastewater treatment control system based on an MBR process, the system includes a control layer and a facility layer, the control layer is configured to:
determining the number of parallel work of the MBR membranes based on the preset MBR unit time processing requirement and the unit time processing capacity of a single MBR membrane;
setting a plurality of MBR basic membrane groups in an MBR pool included in the facility layer according to the specified starting-stopping time length ratio of the MBR membranes and the number of the parallel work, wherein the total processing capacity per unit time of the plurality of MBR basic membrane groups is larger than the processing requirement per unit time of the MBR;
and controlling the plurality of MBR basic membrane groups to enter a pause period in turn, and setting an MBR additional membrane group in the MBR tank to replace the paused MBR basic membrane group to execute MBR treatment.
Optionally, the control layer is specifically configured to:
determining the designated start-stop time length of the MBR membrane as the number of MBR basic membrane groups according to an integer m obtained by rounding down;
and dividing the parallel work number by the integer m to obtain the number of MBR membranes in each MBR basic membrane group.
Optionally, the control layer is specifically configured to:
controlling pause periods of the plurality of MBR basic membrane groups not to overlap with each other;
setting an MBR additional membrane group so that the unit time treatment capacity of the MBR additional membrane group is equal to that of the single MBR basic membrane group;
when the target MBR basic membrane group enters a pause period, introducing sewage corresponding to the target MBR basic membrane group into the MBR additional membrane group.
Optionally, the control layer is specifically configured to:
setting an MBR additional membrane group so that the unit time treatment capacity of the MBR additional membrane group is equal to that of the single MBR basic membrane group;
controlling the pause periods of the plurality of MBR basic membrane groups and the MBR additional membrane groups to be sequentially connected end to end;
when a first MBR membrane group enters a pause period and a second MBR membrane group enters a working period, introducing sewage corresponding to the first MBR membrane group into the second MBR membrane group, wherein the first MBR membrane group and the second MBR membrane group are any one of the MBR basic membrane group or the MBR additional membrane group.
Optionally, the control layer is further configured to:
and when the unit time processing requirement of the MBR is increased, increasing the number of MBR membranes contained in each MBR basic membrane group and MBR additional membrane group according to the requirement increase amount and the unit time processing amount of a single MBR membrane.
Optionally, the control layer is further configured to:
and controlling a water production pump of the MBR tank to pump the sewage treated by the MBR into the security filter at a constant speed.
Optionally, the control layer is further configured to:
and controlling a booster pump of the cartridge filter based on the pumping power of a water production pump of the MBR tank, and pumping sewage from the cartridge filter into reverse osmosis equipment.
Optionally, the control layer is further configured to:
after a preset membrane group cleaning condition is met, cleaning a target MBR membrane group in a pause period corresponding to the target MBR membrane group, wherein the target MBR membrane group is the MBR additional membrane group or any one of the MBR basic membrane groups.
Optionally, the control layer is further configured to:
periodically counting the total working time of each MBR basic membrane group;
and performing task replacement on the MBR basic membrane group with the longest total working time and the MBR additional membrane group.
In summary, the present application has the following beneficial effects:
by adopting the MBR process-based sewage treatment control method disclosed by the application, MBR membranes to be used in an MBR tank are subjected to membrane grouping, a plurality of MBR basic membrane groups and MBR additional membrane groups with the same scale and standard are set, the plurality of MBR basic membrane groups are controlled to alternately enter a pause time period, and the MBR additional membrane groups are used for replacing and executing MBR treatment. Like this, through the aforesaid settlement, realized that MBR basic membrane group and MBR additional membrane group pause in turn, MBR pond continuous operation, a plurality of water pumps such as the product water pump in MBR pond can last the operation, need not to open and shut repeatedly, both can satisfy the start-stop requirement of MBR membrane, can improve the life of water pump again, saved the energy resource consumption who brings because of the water pump is opened and shut repeatedly.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a sewage treatment control system;
FIG. 2 is a flow chart of a MBR-based sewage treatment control method in one embodiment of the present application;
FIG. 3 is a schematic diagram of a control structure of an MBR membrane group in one embodiment of the present application;
FIG. 4 is a schematic diagram of a control structure of an MBR membrane unit in one embodiment of the present application;
FIG. 5 is a schematic diagram illustrating control logic of an MBR membrane group according to an embodiment of the present application;
FIG. 6 is a schematic diagram illustrating control logic of an MBR membrane group according to an embodiment of the present application;
FIG. 7 is a schematic diagram of control logic of an MBR membrane group according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-6 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application provides a sewage treatment control method based on MBR process, which can be applied to a sewage treatment control system, as shown in FIG. 1, the sewage treatment control system can comprise a control layer and a facility layer, wherein the control layer can be mainly used for controlling related equipment for sewage treatment, such as controlling the on/off of a water pump, power, operation of a stirrer and a mud press, the facility layer can be a mechanical system formed by all equipment and water tanks in the sewage purification process, and a specific visual flow process can comprise water tanks such as an adjusting tank, a reaction tank, a primary sedimentation tank and a biochemical tank, and equipment such as a stirrer, a filter press, a security filter, reverse osmosis equipment and various water pumps. Further, the facility layer may include a biochemical group composed of a plurality of biochemical tanks, and the last tank of the biochemical group may be composed of an MBR tank provided with an MBR membrane group.
The process flow shown in fig. 2 will be described in detail below with reference to the specific embodiments, and the contents may be as follows:
and 201, determining the number of parallel work of the MBR membranes based on the preset MBR unit time processing requirement and the unit time processing capacity of a single MBR membrane.
In implementation, the sewage treatment control system may determine the total amount of sewage entering the sewage treatment control system per unit time based on actual production requirements, and then determine the total amount of sewage to be treated by the MBR tank per unit time, i.e. the MBR treatment requirement per unit time, based on the variation range of the total amount of sewage when reaching the MBR tank. Therefore, the MBR unit time treatment requirement can be set according to the total sewage amount flowing into the sewage treatment control system in unit time. Meanwhile, the treatment capacity per unit time of a single MBR membrane may be set according to the maximum sewage filtration capacity per unit time of the single MBR membrane, for example, may be set to 80% of the maximum sewage filtration capacity. Therefore, the preset MBR unit time processing requirement can be divided by the unit time processing capacity of a single MBR membrane, so that the parallel work number of the MBR membranes is obtained, namely the number of the MBR membranes for performing MBR processing on sewage at any moment in the MBR tank.
202, setting a plurality of MBR basic membrane groups in the MBR tank according to the specified on-off time length ratio and the parallel work number of the MBR membranes.
Wherein the specified on-off time length ratio is a ratio between the specified operating time length and the pause time length of the MBR membrane in one cycle, and one operation plus one pause is defined as one cycle. The MBR base membrane group may be a module composed of a plurality of MBR membranes.
In implementation, after the number of parallel operation of the MBR membranes is determined, the specified operation time and pause time of the MBR membranes can be obtained, and the specified on-off time ratio of the MBR membranes is calculated. And then, determining a plurality of MBR basic membrane groups by combining the specified on-off time length ratio and the parallel work number of the MBR membranes, so that the total unit time processing capacity of the plurality of MBR basic membrane groups is greater than the unit time processing requirement of the MBR, and setting the plurality of MBR basic membrane groups in the MBR tank.
And 203, controlling a plurality of MBR basic membrane groups to enter a pause period in turn, and setting an MBR additional membrane group in the MBR tank to replace the paused MBR basic membrane group to execute MBR treatment.
In implementation, after the plurality of MBR basic membrane groups are set in the MBR tank, before the MBR basic membrane groups are put into use, the working time period and the suspension time period of the plurality of MBR basic membrane groups may be set, so that the plurality of MBR basic membrane groups alternately enter the suspension time period, that is, the plurality of MBR basic membrane groups of 2 or more at the same time are prevented from being in the suspension state. Meanwhile, an MBR additional membrane group may be set in the MBR tank, and MBR processing may be performed using the MBR additional membrane group instead of the MBR basic membrane group in the suspended state, as shown in fig. 3. It is understood that the processing amount per unit time of the MBR additional membrane group is not less than that of the single MBR basic membrane group, and the processing amount per unit time of the MBR additional membrane group may be selected to be equal to that of the single MBR basic membrane group based on the lowest cost principle.
For step 202, in an embodiment, the setting process of the plurality of MBR basic membrane groups may specifically be as follows: determining the designated start-stop time length of the MBR membrane as the number of the MBR basic membrane groups according to an integer m obtained by rounding down; and dividing the parallel work number by an integer m to obtain the number of MBR membranes in each MBR basic membrane group.
In implementation, when the MBR basic membrane group is set, the number of the MBR basic membrane group may be determined first, specifically, the specified start-stop time length of the MBR membrane is rounded downward, and an integer m obtained by rounding is determined as the number of the MBR basic membrane group, where if the operating time length is 8 minutes and the pause time length is 2 minutes, the number of the MBR basic membrane group is 4, and if the operating time length is 7 minutes and the pause time length is 3 minutes, the number of the MBR basic membrane group is 2. Next, the number of parallel-connected operations calculated in step 201 may be divided by an integer m, so as to obtain the number of MBR membranes in each MBR basic membrane group. For example, the number of parallel operations is 100, the number of MBR basic membrane groups is 4, and the number of MBR membranes in each MBR basic membrane group is 25. It should be noted that, because the scale of the sewage treatment capacity is large, the number of the parallel operation numbers of the MBRs is large, when the number of the MBR membranes in each MBR basic membrane group obtained by calculation cannot be rounded, the nearest integer may be selected, or the number may be rounded upward, and the minimum integer greater than the calculation result is selected as the number of the MBR membranes in each MBR basic membrane group, for example, the number of the parallel operation numbers is 100, the number of the MBR basic membrane groups is 3, and the number of the MBR membranes in each MBR basic membrane group is 33 or 34.
Further, a plurality of MBR membrane units may be constructed based on each of the MBR basic membrane group and the MBR additional membrane group, each of the MBR membrane units includes m +1 MBR membranes, and the m +1 MBR membranes respectively belong to the m MBR basic membrane groups and the MBR additional membrane groups, that is, 1 MBR membrane is provided by each MBR membrane group to form 1 MBR membrane unit, which is specifically shown in fig. 4.
For step 203, in an embodiment, the control process of the MBR basic membrane group and the MBR additional membrane group may specifically be as follows: controlling pause periods of the plurality of MBR basic membrane groups not to overlap with each other; setting an MBR additional membrane group to enable the unit time treatment capacity of the MBR additional membrane group and the unit time treatment capacity of the single MBR basic membrane group to be equal; when the target MBR basic membrane group enters a pause period, introducing sewage corresponding to the target MBR basic membrane group into the MBR additional membrane group.
The target MBR basic membrane group can be any MBR basic membrane group in a normal working state in the MBR tank.
In implementation, when the working period and the suspension period of the plurality of MBR basic membrane groups are set, the suspension periods of the plurality of MBR basic membrane groups may be set to be not overlapped with each other, that is, any two MBR basic membrane groups are not in a suspension state at the same time, and are specifically implemented by a control system of the MBR pool. And then, an MBR additional membrane group can be arranged in the MBR tank, so that the unit time treatment capacity of the MBR additional membrane group is equal to that of a single MBR basic membrane group, and the MBR additional membrane group and the MBR basic membrane group can be specifically arranged to have the same number of MBR membranes. In this way, when the target MBR basic membrane group enters the pause period from the working period, sewage corresponding to the target MBR basic membrane group can be introduced into the MBR additional membrane group, and the MBR treatment is performed by the MBR additional membrane group instead of the target MBR basic membrane group. Further, when the target MBR basic membrane group enters the working period from the pause period, sewage corresponding to the MBR additional membrane group may be introduced into the target MBR basic membrane group again, and the target MBR basic membrane group resumes to perform corresponding MBR treatment.
Referring to fig. 5, assuming that the operation period of a single MBR membrane is 7 units, corresponding to a white frame in the figure, and the pause period is 3 units, corresponding to a black frame in the figure, there are 2 MBR basic membrane groups and 1 MBR additional membrane group, wherein the pause periods of the plurality of MBR basic membrane groups do not overlap with each other, and when the MBR basic membrane groups enter the pause period, the MBR additional membrane group enters the operation period to perform MBR processing instead of the MBR basic membrane groups.
For step 203, in an embodiment, the control process of the MBR basic membrane group and the MBR additional membrane group may specifically be as follows: setting an MBR additional membrane group to enable the unit time treatment capacity of the MBR additional membrane group and the unit time treatment capacity of the single MBR basic membrane group to be equal; controlling the pause periods of the plurality of MBR basic membrane groups and MBR additional membrane groups to be sequentially connected end to end; when the first MBR basic membrane group enters a pause time period and the second MBR basic membrane group enters a working time period, introducing sewage corresponding to the first MBR basic membrane group into the second MBR basic membrane group.
The first MBR membrane group and the second MBR membrane group are any MBR basic membrane group or MBR additional membrane group.
In implementation, the MBR additional membrane group may be set in the MBR tank, so that the processing amount per unit time of the MBR additional membrane group is equal to that of a single MBR basic membrane group, and specifically, the number of MBR membranes in the MBR additional membrane group may be set to be the same as that of the MBR basic membrane group. And then, setting the working time interval and the pause time interval of the plurality of MBR basic membrane groups and MBR additional membrane groups together, namely controlling the pause time intervals of the plurality of MBR basic membrane groups and MBR additional membrane groups to be sequentially connected end to end, namely when one MBR basic membrane group or MBR additional membrane group enters the pause time interval, the other MBR basic membrane group or MBR additional membrane group enters the working time interval from the pause time interval. The operation and suspension of the MBR basic membrane group and the MBR additional membrane group can be realized by a control system of the MBR tank. Therefore, when the first MBR membrane group enters the pause time period from the working time period and the second MBR membrane group enters the working time period from the pause time period, sewage corresponding to the first MBR membrane group can be led into the second MBR membrane group, and the second MBR membrane group replaces the first MBR membrane group to execute MBR treatment.
For example, the working period of a single MBR membrane is 8 minutes, the pause period is 2 minutes, 5 MBR membrane groups (including 4 MBR basic membrane groups and 1 MBR additional membrane group) can be set, and the 5 MBR membrane groups can work alternately, that is, 4 MBR membrane groups are always in the working period and 1 MBR membrane group is in the pause period.
Referring to fig. 6, assuming that the operating period of a single MBR membrane is 7 units, corresponding to a white frame in the figure, and the pause period is 3 units, corresponding to a black frame in the figure, there are 2 MBR basic membrane groups and 1 MBR additional membrane group, wherein the pause periods of the plurality of MBR basic membrane groups and the plurality of MBR additional membrane groups are sequentially connected end to end, and when one MBR membrane group enters the pause period, the other MBR membrane group enters the operating period.
It should be noted that, depending on the difference between the pause period and the working period of the MBR membrane, there may be no first MBR membrane group entering the pause period when the second MBR membrane group enters the working period. In one case, the second MBR membrane group can be controlled to temporarily enter the working period, when the first MBR membrane group enters the temporary period, sewage corresponding to the first MBR membrane group is guided into the second MBR membrane group, and the second MBR membrane group replaces the first MBR membrane group to execute MBR treatment. Thus, referring to FIG. 7, the operating period of all MBR membrane groups (including MBR base membrane groups and MBR additional membrane groups) will be delayed equally for an equal length of time. In another case, the operating period of the MBR additional membrane group may be individually set, and an interval between the pause period of the last MBR basic membrane group and the time when the first MBR basic membrane group enters the operating period again may be used as the operating period of the MBR additional membrane group, that is, the content shown in fig. 6.
In another embodiment, when the MBR processing demand per unit time increases, the number of MBR membranes included in each of the MBR basic membrane group and the MBR additional membrane group may be increased according to the demand increase amount and the processing amount per unit time of a single MBR membrane.
In implementation, when the MBR unit time processing requirement increases, that is, when the amount of sewage to be processed in the MBR tank per unit time increases, the requirement increase amount may be divided by the unit time processing amount of a single MBR membrane, the number of the MBR membranes to be increased per unit time is determined, and then the number of the MBR membranes to be increased per MBR basic membrane group is calculated. For example, 20 MBR membranes are required to be added in a unit time, and 5 MBR basic membrane groups are required to be added, so that 4 MBR membranes can be added in each MBR membrane group. Further, a corresponding number of MBR membranes may be added in each of the MBR base membrane group and the MBR additional membrane group based on the above-described number. Based on the above-mentioned setting of the MBR membrane units, the number of MBR membrane units can be increased in the MBR tank.
In another embodiment, the wastewater in the MBR tank can be directly introduced into the cartridge filter, and the corresponding treatment can be as follows: and controlling a water production pump of the MBR tank to pump the sewage treated by the MBR into the security filter at a constant speed.
In the implementation, compare in the mode that a plurality of MBR membrane pause simultaneous working simultaneously among the prior art, adopt the scheme that MBR membrane group pauses in turn, the MBR pond can stabilize the product water, the product water yield tends to evenly in the unit interval, then need not to additionally set up MBR product water pond again and adjust MBR pond product water rate like this, can directly set up sewage and directly flow into safety filter from the MBR pond, the product water pump that specifically can control MBR pond is with the sewage suction safety filter at the uniform velocity after the MBR is handled, in order to save the deployment work of MBR product water pond and one-level booster pump.
Optionally, the water producing pump of the MBR tank and the booster pump of the cartridge filter may be controlled in a combined manner, and the corresponding processes may be as follows: and controlling a booster pump of the cartridge filter based on the pumping power of a water production pump of the MBR tank, and pumping the sewage from the cartridge filter into the reverse osmosis equipment.
In implementation, compared with the situation that the water producing pump of the MBR tank and the booster pump of the security filter are independently controlled in the prior art, the MBR water producing tank and the arrangement of the primary booster pump thereof are saved, sewage directly enters the security filter from the MBR tank, and then the water producing pump of the MBR tank and the booster pump of the security filter can be jointly controlled, so that the two water pumps can be relatively synchronized in state. In actual setting, can be based on the power of drawing water of the product water pump in MBR pond, carry out real time control to the power of drawing water of security filter's booster pump, guarantee that the power of drawing water of two water pumps equals to can draw sewage into reverse osmosis equipment from security filter at the uniform velocity through security filter's booster pump.
In another embodiment, the MBR membrane module may be cleaned using a pause period, and the corresponding process may be as follows: and after the preset membrane group cleaning conditions are met, cleaning the target MBR membrane group within the corresponding pause time period of the target MBR membrane group.
Wherein, the target MBR membrane group is an MBR additional membrane group or any MBR basic membrane group.
In the implementation, the MBR membrane needs to be cleaned regularly to ensure the quality of the MBR treatment, so that the MBR membrane can be cleaned by taking the MBR membrane group as a unit in this embodiment. First, the membrane module cleaning conditions may be preset, such as when the cumulative wastewater treatment amount of the MBR membrane modules reaches a preset threshold, or every specified time period (e.g., every 3 hours). Therefore, after the preset membrane group cleaning condition is met, when the target MBR membrane group enters the pause time period, the target MBR membrane group starts to be cleaned, and when the target MBR membrane group enters the working time period from the pause time period, the cleaning treatment is stopped. Here, the washing may be performed in 1 or consecutive multiple pause periods according to the washing need. Specifically, each MBR membrane group can be provided with a water outlet valve and a cleaning valve, and when the MBR membrane group is cleaned, the water outlet valve of the MBR membrane group can be closed and the cleaning valve of the MBR membrane group can be opened; and after the cleaning is stopped, the water outlet valve of the MBR membrane group can be opened, and the cleaning valve of the MBR membrane group is closed. Furthermore, the cleaning water of the MBR membrane group can be extracted from the clean water tank by the cleaning water pump, the pumping power change of the cleaning water pump is slowly controlled when the cleaning is started and finished, namely the pumping power of the cleaning water pump is slowly increased within a specified time after the cleaning is started, and the pumping power of the cleaning water pump is slowly reduced within a specified time before the cleaning is finished. Therefore, the impact of the cleaning water flow on the MBR membrane can be reduced, and the service life of the MBR membrane can be prolonged. It is understood that, the preset threshold value of the accumulated sewage treatment amount is a plurality of threshold values arranged in stages, such as 50t, 100t and 150t …, so that each time the accumulated sewage treatment amount of the MBR basic membrane group reaches a preset threshold value, a cleaning treatment can be triggered. As with the MBR basic membrane module, the MBR additional membrane module may be cleaned by using the MBR temporary membrane module based on the above-described process.
In another embodiment, the damage rates of the MBR basic membrane group and the MBR additional membrane group may be synchronized, and the corresponding processing may be as follows: periodically counting the total working time of each MBR basic membrane group; and replacing the tasks of the MBR basic membrane group and the MBR additional membrane group with the longest total working time.
In implementation, for the case that the operating durations of the MBR basic membrane group and the MBR additional membrane group are different, considering that the total operating duration of the MBR additional membrane group is generally less than the total operating duration of the MBR basic membrane group, the total operating duration of each MBR basic membrane group may be periodically counted, and then the MBR basic membrane group and the MBR additional membrane group with the longest total operating duration are subjected to task replacement, that is, the MBR additional membrane group is set as a new MBR basic membrane group, the operating period and the suspension period are consistent with the original MBR basic membrane group, and the MBR basic membrane group is set as a new MBR additional membrane group, and the operating period and the suspension period are consistent with the original MBR additional membrane group. Additionally, if the total working time of a plurality of MBR basic membrane groups is the longest at the same time, any one of the MBR basic membrane groups and the MBR additional membrane group can be selected for task replacement. Of course, if the operating time of the MBR basic membrane group and the MBR additional membrane group is the same, the above-described task replacement process need not be performed.
By adopting the MBR process-based sewage treatment control method disclosed by the application, MBR membranes to be used in an MBR tank are subjected to membrane grouping, a plurality of MBR basic membrane groups and MBR additional membrane groups with the same scale and standard are set, the plurality of MBR basic membrane groups are controlled to alternately enter a pause time period, and the MBR additional membrane groups are used for replacing and executing MBR treatment. Like this, through the aforesaid settlement, realized that MBR basic membrane group and MBR additional membrane group pause in turn, MBR pond continuous operation, a plurality of water pumps such as the product water pump in MBR pond can last the operation, need not to open and shut repeatedly, both can satisfy the start-stop requirement of MBR membrane, can improve the life of water pump again, saved the energy resource consumption who brings because of the water pump is opened and shut repeatedly.
Based on the same technical concept, the embodiment of the present application further provides a sewage treatment control system based on the MBR process, the system includes a control layer and a facility layer, the control layer is used for:
determining the number of parallel work of the MBR membranes based on the preset MBR unit time processing requirement and the unit time processing capacity of a single MBR membrane;
setting a plurality of MBR basic membrane groups in an MBR pool included in the facility layer according to the specified starting-stopping time length ratio of the MBR membranes and the number of the parallel work, wherein the total processing capacity per unit time of the plurality of MBR basic membrane groups is larger than the processing requirement per unit time of the MBR;
and controlling the plurality of MBR basic membrane groups to enter a pause period in turn, and setting an MBR additional membrane group in the MBR tank to replace the paused MBR basic membrane group to execute MBR treatment.
Optionally, the control layer is specifically configured to:
determining the designated start-stop time length of the MBR membrane as the number of MBR basic membrane groups according to an integer m obtained by rounding down;
and dividing the parallel work number by the integer m to obtain the number of MBR membranes in each MBR basic membrane group.
Optionally, the control layer is specifically configured to:
controlling pause periods of the plurality of MBR basic membrane groups not to overlap with each other;
setting an MBR additional membrane group so that the unit time treatment capacity of the MBR additional membrane group is equal to that of the single MBR basic membrane group;
when the target MBR basic membrane group enters a pause period, introducing sewage corresponding to the target MBR basic membrane group into the MBR additional membrane group.
Optionally, the control layer is specifically configured to:
setting an MBR additional membrane group so that the unit time treatment capacity of the MBR additional membrane group is equal to that of the single MBR basic membrane group;
controlling the pause periods of the plurality of MBR basic membrane groups and the MBR additional membrane groups to be sequentially connected end to end;
when a first MBR membrane group enters a pause period and a second MBR membrane group enters a working period, introducing sewage corresponding to the first MBR membrane group into the second MBR membrane group, wherein the first MBR membrane group and the second MBR membrane group are any one of the MBR basic membrane group or the MBR additional membrane group.
Optionally, the control layer is further configured to:
and when the unit time processing requirement of the MBR is increased, increasing the number of MBR membranes contained in each MBR basic membrane group and MBR additional membrane group according to the requirement increase amount and the unit time processing amount of a single MBR membrane.
Optionally, the control layer is further configured to:
and controlling a water production pump of the MBR tank to pump the sewage treated by the MBR into the security filter at a constant speed.
Optionally, the control layer is further configured to:
and controlling a booster pump of the cartridge filter based on the pumping power of a water production pump of the MBR tank, and pumping sewage from the cartridge filter into reverse osmosis equipment.
Optionally, the control layer is further configured to:
after a preset membrane group cleaning condition is met, cleaning a target MBR membrane group in a pause period corresponding to the target MBR membrane group, wherein the target MBR membrane group is the MBR additional membrane group or any one of the MBR basic membrane groups.
Optionally, the control layer is further configured to:
periodically counting the total working time of each MBR basic membrane group;
and performing task replacement on the MBR basic membrane group with the longest total working time and the MBR additional membrane group.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (9)
1. A sewage treatment control method based on MBR process is characterized by comprising the following steps:
determining the number of parallel work of the MBR membranes based on the preset MBR unit time processing requirement and the unit time processing capacity of a single MBR membrane;
setting a plurality of MBR basic membrane groups in an MBR pool according to the specified starting-stopping time length ratio of the MBR membranes and the number of the parallel work, wherein the total processing capacity per unit time of the plurality of MBR basic membrane groups is larger than the processing requirement per unit time of the MBR;
controlling the plurality of MBR basic membrane groups to enter a pause period in turn, and setting an MBR additional membrane group in the MBR tank to replace the paused MBR basic membrane group to execute MBR treatment;
wherein, according to the appointed start-stop time length ratio of the MBR membrane and the number of the parallel work, a plurality of MBR basic membrane groups are set, and the method comprises the following steps:
determining the designated start-stop time length of the MBR membrane as the number of MBR basic membrane groups according to an integer m obtained by rounding down;
and dividing the parallel work number by the integer m to obtain the number of MBR membranes in each MBR basic membrane group.
2. The method of claim 1, wherein controlling the plurality of MBR basic membrane groups to alternately enter a pause period and setting an MBR additional membrane group to perform MBR processing instead of the stopped MBR basic membrane group comprises:
setting an MBR additional membrane group so that the unit time treatment capacity of the MBR additional membrane group is equal to that of the single MBR basic membrane group;
controlling the pause periods of the plurality of MBR basic membrane groups and the MBR additional membrane groups to be sequentially connected end to end;
when a first MBR membrane group enters a pause period and a second MBR membrane group enters a working period, introducing sewage corresponding to the first MBR membrane group into the second MBR membrane group, wherein the first MBR membrane group and the second MBR membrane group are any one of the MBR basic membrane group or the MBR additional membrane group.
3. The method of claim 1, wherein controlling the plurality of MBR basic membrane groups to alternately enter a pause period and setting an MBR additional membrane group to perform MBR processing instead of the stopped MBR basic membrane group comprises:
controlling pause periods of the plurality of MBR basic membrane groups not to overlap with each other;
setting an MBR additional membrane group so that the unit time treatment capacity of the MBR additional membrane group is equal to that of the single MBR basic membrane group;
when the target MBR basic membrane group enters a pause period, introducing sewage corresponding to the target MBR basic membrane group into the MBR additional membrane group.
4. The method of claim 1, further comprising:
and when the unit time processing requirement of the MBR is increased, increasing the number of MBR membranes contained in each MBR basic membrane group and MBR additional membrane group according to the requirement increase amount and the unit time processing amount of a single MBR membrane.
5. The method of claim 1, further comprising:
and controlling a water production pump of the MBR tank to pump the sewage treated by the MBR into the security filter at a constant speed.
6. The method of claim 5, further comprising:
and controlling a booster pump of the cartridge filter based on the pumping power of a water production pump of the MBR tank, and pumping sewage from the cartridge filter into reverse osmosis equipment.
7. The method of claim 1, further comprising:
after a preset membrane group cleaning condition is met, cleaning a target MBR membrane group in a pause period corresponding to the target MBR membrane group, wherein the target MBR membrane group is the MBR additional membrane group or any one of the MBR basic membrane groups.
8. The method of claim 1, further comprising:
periodically counting the total working time of each MBR basic membrane group;
and performing task replacement on the MBR basic membrane group with the longest total working time and the MBR additional membrane group.
9. A MBR process based sewage treatment control system, comprising a control layer and a facility layer, wherein the control layer is configured to:
determining the number of parallel work of the MBR membranes based on the preset MBR unit time processing requirement and the unit time processing capacity of a single MBR membrane;
setting a plurality of MBR basic membrane groups in an MBR pool included in the facility layer according to the specified starting-stopping time length ratio of the MBR membranes and the number of the parallel work, wherein the total processing capacity per unit time of the plurality of MBR basic membrane groups is larger than the processing requirement per unit time of the MBR;
controlling the plurality of MBR basic membrane groups to enter a pause period in turn, and setting an MBR additional membrane group in the MBR tank to replace the paused MBR basic membrane group to execute MBR treatment;
wherein, according to the appointed start-stop time length ratio of the MBR membrane and the number of the parallel work, a plurality of MBR basic membrane groups are set, and the method comprises the following steps:
determining the designated start-stop time length of the MBR membrane as the number of MBR basic membrane groups according to an integer m obtained by rounding down;
and dividing the parallel work number by the integer m to obtain the number of MBR membranes in each MBR basic membrane group.
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