CN114920356A - Intelligent cleaning method for MBR (membrane bioreactor) - Google Patents
Intelligent cleaning method for MBR (membrane bioreactor) Download PDFInfo
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- CN114920356A CN114920356A CN202210649933.8A CN202210649933A CN114920356A CN 114920356 A CN114920356 A CN 114920356A CN 202210649933 A CN202210649933 A CN 202210649933A CN 114920356 A CN114920356 A CN 114920356A
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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
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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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
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to the field of sewage treatment, and provides an MBR membrane bioreactor intelligent cleaning method, which comprises the following steps: step 1: first emptying the cleaning membrane pool; step 2: cleaning the membrane tank, supplementing water, aerating and backwashing; step 3: the second time of emptying the cleaning membrane pool; step 4: cleaning a membrane pool, supplementing water, adding medicine, soaking and backwashing; step 5: the third time of emptying the cleaning membrane pool; step 6: normal water production; according to the invention, the membrane component in the cleaning membrane pool is effectively cleaned, so that the pollution of the membrane bioreactor is delayed, the cleaning time is shortened, and the water production efficiency is improved.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to an intelligent cleaning method for an MBR (membrane bioreactor).
Background
The Membrane Bioreactor (MBR) technology is a novel technology of modern sewage treatment, compared with the traditional sewage treatment process, the MBR has the advantages of small floor area, stable effluent quality and the like, the traditional MBR cleaning is generally carried out according to a fixed period, stages such as emptying, water replenishing, medicine adding, soaking and the like are sequentially carried out when a cleaning mode is entered, because the cleaning process is carried out according to a time period, the judgment of the cleaning effect can be known only when the next water production period is entered, if the water production is still low, the cleaning is not thorough, the cleaning in the next period such as intelligence and the like is carried out, and the cleaning effect is known after the cleaning is still required to be completed, the Membrane pollution is more and more serious due to the sequential circulation of the processes;
meanwhile, the liquid level monitoring of the current membrane pool adopts an ultrasonic liquid level meter, but because the membrane pool is in a sealed or semi-sealed space and the sludge concentration in the membrane pool is higher, generally 8000 mg/L-12000 mg/L, foam is formed during aeration, the foam formed during aeration easily distorts the detection of the ultrasonic liquid level meter, so that although the sewage is drained when the membrane pool is emptied, an emptying pump still runs dry, and the equipment is damaged.
Disclosure of Invention
The invention provides an intelligent cleaning method of an MBR (membrane bioreactor). after entering a cleaning mode, an emptying pump outside a membrane pool completely empties and cleans the membrane pool according to the emptying time calculated by the liquid level and the slope of the operation time; calculating the soaking time after water replenishing according to parameters such as outlet pressure of a backwashing pipeline, a relation value of flow and frequency before cleaning (water production flow under each unit frequency) and the like in the water replenishing process; when the rest 5 minutes of the soaking procedure is reached, the aeration rate of the cleaning membrane tank is increased; during the dosing soaking period, backwashing is carried out once every half an hour, and the soaking time is calculated according to the backwashing pressure, so that the membrane assembly in the cleaning membrane pool can be effectively cleaned, the pollution of the membrane bioreactor is delayed, the cleaning time is shortened, and the water production efficiency is improved.
The technical scheme of the invention is realized as follows:
an MBR membrane bioreactor intelligent cleaning method and a cleaning method are provided, wherein the MBR membrane bioreactor comprises:
the membrane pool is internally provided with an ultrasonic liquid level meter and an aeration system;
the membrane assembly is arranged in the membrane pool;
the backwashing pump is connected with a backwashing main pipe, and the backwashing main pipe is connected with a backwashing pipeline for communication;
a backwashing pressure gauge and an electromagnetic flowmeter are arranged on the backwashing main pipe;
the backwashing pipeline is communicated with a first branch backwashing pipeline which is simultaneously communicated with the backwashing main pipe and the backwashing main pipe, and the first branch backwashing pipeline is provided with a backwashing valve;
a second branch backwashing pipeline is communicated with the backwashing pipeline, each second branch backwashing pipeline is communicated with the backwashing pipeline and the membrane pool, and a water replenishing valve is arranged on each second branch backwashing pipeline;
the water production pipeline is communicated with the membrane pool, and a water production pressure gauge is arranged on the water production pipeline;
the aeration system comprises an air blower, a plurality of sets of aeration branch pipes and a plurality of pneumatic butterfly valves, the plurality of sets of aeration branch pipes are communicated with the air blower, one pneumatic butterfly valve is installed on one aeration branch pipe, and the aeration branch pipes are communicated with the membrane tank;
n membrane tanks are arranged, wherein N is an integer and is more than or equal to 2;
m membrane assemblies are arranged in each membrane pool, and M is more than or equal to 1;
n water production pipelines are arranged and are respectively communicated with the N membrane tanks;
the membrane pool control system is connected with the ultrasonic liquid level meter, the membrane component, the backwashing pump, the backwashing pressure gauge, the electromagnetic flowmeter, the backwashing valve, the water replenishing valve, the water production pressure gauge, the air blower and the plurality of pneumatic butterfly valves;
referring to the attached figure 1, the MBR membrane bioreactor intelligent cleaning method comprises the following steps:
step 1: first emptying of the cleaning membrane pool (the membrane pool to be cleaned); in the Step1 stage in the prior art, the liquid level detection is inaccurate due to the fact that the ultrasonic liquid level meter is easily interfered by foam when the liquid level is low, so that the emptying pump is dry-rotated, and the emptying pump is damaged and fails;
in the one-time emptying stage of the cleaning membrane pool, firstly, the liquid level starts emptying and counting down, and because the emptying state does not reach a stable state due to gas and other reasons in a pipeline at the very beginning stage of emptying, a time point t1 is taken to record the liquid level H1 at the time of t1, and the t1 is more than or equal to 1 (unit: min); when the time reaches t2 after a period of time, the liquid level H2 at the time of t2 is recorded, t2-t1 is more than or equal to 5 and less than or equal to 8 (unit: min), and the detection of the ultrasonic liquid level meter for the first ten minutes of emptying is accurate according to the experience of emptying for many times;
and calculating the emptying time t according to an emptying algorithm:
the starting level of membrane pool emptying versus time is: H-Kt + b, see fig. 4;
wherein:
k is the slope of the straight line in the upper graph;
b is the initial liquid level of the membrane tank for emptying;
therefore, from the time t2, the evacuation time t required for evacuation is:
(t is the time required for evacuation);
according to the calculation result, starting a backwashing pump, opening a backwashing valve and closing a water replenishing valve 5 minutes before the emptying pump stops;
the evacuation method avoids the phenomenon of dry running of the evacuation pump caused by abnormal monitoring of the ultrasonic liquid level meter; meanwhile, in order to achieve the purpose of reducing the sludge content in the membrane tank as much as possible after the membrane tank is emptied, a backwashing pump is started 5 minutes before the emptying pump stops, a backwashing valve is opened, and a water replenishing valve is closed, so that the membrane wires are washed by water from the inside and the outside through backwashing action, the sludge on the outer surface of the membrane wires is removed, and meanwhile, the residual sludge in the membrane tank is washed;
step 2: cleaning the membrane tank, supplementing water, aerating and backwashing;
in the stage, firstly, water is supplemented to the membrane pool to be cleaned, in the water supplementing process of the membrane pool cleaning, the alternate action of closing and opening of a water supplementing valve is repeated, the backwashing effect of the membrane pool cleaning is achieved, meanwhile, in order to improve the cleaning effect, a pneumatic butterfly valve on an aeration branch pipe of an aeration system, which is positioned outside the membrane pool cleaning, is closed, a pneumatic butterfly valve on the aeration branch pipe connected with the membrane pool cleaning is opened, the aeration branch pipe connected with the membrane pool cleaning is communicated with an air blower, the air blower aerates the membrane pool cleaning in a parallel connection mode through the aeration branch pipes, and the aeration quantity in the membrane pool cleaning is increased, and the attached figure 3 shows;
in the stage, aeration quantity in the cleaning membrane tank is mainly increased to wash away a filter cake layer on the membrane wires, and in order to meet the requirement, firstly: the clear water level in the cleaning membrane tank is required; secondly, the method comprises the following steps: the aeration butterfly valve needs to perform corresponding actions;
the clear water liquid level requirement of the cleaning membrane tank is as follows: the clear water liquid level of the cleaning membrane tank is about 10 cm lower than the liquid levels of other membrane tanks; the air flow for cleaning the membrane tank is increased by reducing the water pressure for cleaning the membrane tank;
the requirements on the aeration butterfly valve are as follows: in the full water aeration stage of the cleaning membrane tank, the backwashing pump works for 1 minute every 5 minutes; back washing the membrane filaments from inside to outside through a back washing pipeline;
meanwhile, the pressure value of the backwashing pipeline is compared with a standard value of pressure value, and the reagent adding concentration and the reagent soaking time required in the Step4 stage are adjusted in time, wherein the pressure value of the backwashing pipeline is a numerical value read from a backwashing pressure gauge;
step 3: the second time of emptying the cleaning membrane pool;
after the time of soaking in clear water and aerating in the Step2 reaches 30 minutes, repeating the Step1 to empty the cleaning membrane pool for the second time;
step 4: cleaning a membrane tank, supplementing water, adding medicine, soaking, aerating and backwashing;
firstly, supplementing water into a cleaning membrane pool, adding a medicament while supplementing water, soaking after the water supplementing is finished, and adjusting the soaking time calculated in the Step2 stage according to the pressure on a backwashing pipeline in the water supplementing process;
in this stage, need open backwash pump, backwash valve, moisturizing valve and carry out the moisturizing, the liquid level that washs the membrane pond needs to reach La, wherein:
L N the liquid level of each membrane pool;
la: the highest liquid level set value in cleaning;
after the drugs are added and soaked for 15 minutes, the soaking time is calculated according to the backwashing pressure displayed on the backwashing pressure gauge, and the method comprises the following specific steps:
(1) closing a water replenishing valve, opening a backwashing valve and opening a backwashing pump to enable the backwashing pump to operate at a fixed frequency f, collecting pressure data P inverse 1 (unit: Kpa) of a backwashing pressure gauge after the backwashing pump operates for 20 seconds, closing the backwashing pump after the backwashing pump operates for 25 seconds, wherein the P inverse 1 is an average value of the collected integer second data of 20-25 seconds;
(2) and (3) calculating the soaking time according to the collected backwashing pressure, wherein the calculation method comprises the following steps:
wherein, T1 is the soaking time (unit: min);
ps: setting a standard pressure value (unit: Kpa), wherein the standard pressure value is the pressure of the last cleaning and the last backwashing of the membrane pool and is used as the standard pressure value;
Ψ t : time coefficient (1 ≦ Ψ modified according to the service life of the membrane module t 1≤10)；
Γ t : the aging coefficient of the membrane module (the aging coefficient of the membrane module is increased by more than or equal to 0 and less than or equal to Γ t and less than or equal to 5 along with the increase of the service life of the membrane module);
f, cleaning the average flow (m) of produced water of the membrane pool in the previous period 3 /h)
Fit: average frequency (Hz) of operation of cleaning previous cycle water pump
In addition, T 1 The value range is T being more than or equal to 45 1 Less than or equal to 150; i.e. T is calculated by the formula when the time is greater than 150 minutes 1 Taking for 150 minutes;
(3) the membrane pool control system starts the detection of the backwashing pressure every 15 minutes and detects the backwashing pressure according to the numerical value P of the backwashing pressure gauge Trans N And (3) calculating the soaking time according to the following calculation formula:
wherein, T N The soaking time (unit: min) calculated by the Nth detection;
P trans N Reading a backwash pipeline pressure value detected by a backwash pressure gauge in the Nth detection;
f, cleaning the average flow (m) of produced water of the membrane tank in the previous period 3 /h)
Fit: average frequency (Hz) of operation of cleaning previous cycle water pump
N is more than or equal to T 1 Less than or equal to 8 (unit: min);
step 5: the third time of emptying the cleaning membrane pool;
when N is less than 8 and the detection result of two continuous backwashing is T <15 x (8-N), the membrane cleaning pool is emptied for three times, and then the water enters step6 to normally produce water;
after the medicine is added and the soaking is finished, the membrane pool can be continuously emptied, and a water inlet and outlet gate is opened to produce water;
when N is 8 and T is more than or equal to 15, Step4 ends the membrane pool control system to alarm and inform; if T calculated through the 8 times of operations is more than or equal to 15, the soaking and backwashing work of the membrane pool is finished, the backwashing soaking is proved to not achieve the expected effect, and corresponding alarm informing actions are made in the control system;
through the operation, the cleaning and soaking time of the membrane tank can be greatly shortened, and the cleaning efficiency of the membrane tank is improved.
After the cleaning method enters a cleaning mode, the membrane tank is completely emptied and cleaned by an emptying pump outside the membrane tank according to the emptying time calculated by the liquid level and the slope of the operation time; calculating the soaking time after water replenishing according to parameters such as outlet pressure of a backwashing pipeline, a relation value (water production flow under each unit frequency) of flow and frequency before flow cleaning and the like in the water replenishing process; when the residual 5 minutes of the soaking program is reached, the aeration quantity of the cleaning membrane tank is increased; during the dosing soaking period, backwashing is carried out every half an hour, and the soaking time is calculated according to backwashing pressure, so that the membrane assembly in the cleaning membrane pool can be effectively cleaned, the pollution of the membrane bioreactor is delayed, the cleaning time is shortened, and the water production efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for a customer of ordinary skill in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit diagram of the overall structure of an MBR membrane bioreactor involved in Step2 of the intelligent MBR membrane bioreactor cleaning method in the embodiment of the present invention;
FIG. 2 is a circuit diagram of a single set of MBR membrane bioreactors shown in FIG. 1;
FIG. 3 is a flow chart of a MBR membrane bioreactor intelligent cleaning method in an embodiment of the present invention;
FIG. 4 is a graph of the start level of the cleaning membrane tank emptying in Step1 of the MBR smart cleaning method shown in FIG. 1 versus time;
a, a tap water plant; b, a water distribution channel of the membrane pool; c, a membrane pool backflow channel; d, a water producing pump; e, cleaning a circulating emptying pump; f, restoring cleaning and adding a sodium hypochlorite pump; g, restoring, cleaning and adding a citric acid pump; h, adding a sodium hypochlorite pump for maintenance cleaning; i, a maintenance cleaning citric acid adding pump; a membrane tank 1; an ultrasonic level gauge 11; a membrane module 12; an aeration system 2; a blower 21; the aeration branch pipes 22; a pneumatic butterfly valve 23; a backwashing pipe 3; a backwash valve 31; a water replenishment valve 32; a first branch backwash line 301; a second branch backwash line 302; a backwash pump 4; a backwashing main pipe 5; a backwash pressure gauge 51; an electromagnetic flow meter 52; a water production pipeline 6; a water production pressure gauge 61.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an embodiment of the present invention, an intelligent cleaning method for an MBR membrane bioreactor, wherein, referring to fig. 1-2, the MBR membrane bioreactor comprises:
the device comprises a membrane tank 1, wherein an ultrasonic liquid level meter 11 and an aeration system 2 are arranged in the membrane tank;
a membrane module 12 disposed in the membrane tank 1;
the backwashing pump 4 is connected with a backwashing main pipe 5, and the backwashing main pipe 5 is connected with a backwashing pipeline 3 for communication;
a backwashing pressure gauge 51 and an electromagnetic flowmeter 52 are arranged on the backwashing main pipe 5;
a first branch backwashing pipeline 301 is communicated with the backwashing pipeline 3 and is simultaneously communicated with the backwashing main pipe 3 and the backwashing main pipe 5, and a backwashing valve 31 is arranged on the first branch backwashing pipeline 301;
a second branch backwashing pipeline 302 is communicated with the backwashing pipeline 3, each second branch backwashing pipeline 302 is communicated with the backwashing pipeline 3 and the membrane pool 1, and a water replenishing valve 32 is arranged on each second branch backwashing pipeline;
the water production pipeline 6 is communicated with the membrane tank 1, and a water production pressure gauge 61 is arranged on the water production pipeline 6;
the aeration system 2 comprises an air blower 21, a plurality of sets of aeration branch pipes 22 and a plurality of pneumatic butterfly valves 23, wherein the plurality of sets of aeration branch pipes are communicated with the air blower, one pneumatic butterfly valve is arranged on one aeration branch pipe, and the aeration branch pipes are communicated with the membrane tank;
n membrane tanks are arranged, wherein N is an integer and is more than or equal to 2;
m membrane assemblies are arranged in each membrane pool 1, and M is more than or equal to 1;
the number of the water production pipelines is N, and the water production pipelines are respectively communicated with the N membrane pools;
the membrane pool control system is connected with the ultrasonic liquid level meter, the membrane component, the backwashing pump, the backwashing pressure gauge, the electromagnetic flowmeter, the backwashing valve, the water replenishing valve, the water production pressure gauge, the air blower and the plurality of pneumatic butterfly valves;
referring to the attached figure 1, the MBR membrane bioreactor intelligent cleaning method comprises the following steps:
step 1: first emptying of the cleaning membrane pool (the membrane pool to be cleaned); in the Step1 stage in the prior art, the liquid level detection is inaccurate due to the fact that the ultrasonic liquid level meter is easily interfered by foam when the liquid level is low, so that the emptying pump is dry-rotated, and the emptying pump is damaged and fails;
in the one-time emptying stage of the cleaning membrane pool, firstly, the liquid level starts emptying and counting down, and because the emptying state does not reach a stable state due to gas and other reasons in a pipeline at the very beginning stage of emptying, a time point t1 is taken to record the liquid level H1 at the time of t1, and the t1 is more than or equal to 1 (unit: min); when the time reaches t2 after a period of time, the liquid level H2 at the time of t2 is recorded, t2-t1 is more than or equal to 5 and less than or equal to 8 (unit: min), and the detection of the ultrasonic liquid level meter for the first ten minutes of emptying is accurate according to the experience of emptying for many times;
and calculating the emptying time t according to an emptying algorithm:
the starting level of membrane pool emptying versus time is: h ═ Kt + b, see fig. 4;
wherein:
k is the slope of the line in FIG. 4;
b is the initial liquid level of the membrane pool;
therefore, from time t2, the evacuation time t required for evacuation is:
(t is the time required for evacuation);
according to the calculation result, starting a backwashing pump, opening a backwashing valve and closing a water replenishing valve 5 minutes before the emptying pump stops;
the evacuation method avoids the phenomenon of dry running of the evacuation pump caused by abnormal monitoring of the ultrasonic liquid level meter. Meanwhile, in order to achieve the purpose of reducing the sludge content in the membrane tank as much as possible after the membrane tank is emptied, a backwashing pump is started 5 minutes before the emptying pump stops, a backwashing valve is opened, and a water replenishing valve is closed, so that the membrane wires are washed by water from the inside and the outside through backwashing action, the sludge on the outer surface of the membrane wires is removed, and meanwhile, the residual sludge in the membrane tank is washed;
step 2: cleaning the membrane tank, supplementing water, aerating and backwashing;
in the stage, firstly, water is supplemented to the membrane pool needing to be cleaned, in the water supplementing process of the membrane pool cleaning, the alternate actions of closing and opening of a water supplementing valve are repeated and circulated, so that the backwashing effect on the membrane pool cleaning is achieved, meanwhile, in order to improve the cleaning effect, a pneumatic butterfly valve on an aeration branch pipe of an aeration system, which is positioned outside the membrane pool cleaning, is closed, a pneumatic butterfly valve on the aeration branch pipe connected with the membrane pool cleaning is opened, the aeration branch pipe connected with the membrane pool cleaning is communicated with an air blower, the air blower aerates the membrane pool cleaning in a parallel connection mode through the aeration branch pipes, and the aeration quantity in the membrane pool cleaning is increased, as shown in the attached figure 3;
in this stage, the aeration rate in the cleaning membrane tank is mainly increased to wash away the filter cake layer on the membrane filaments, and in order to meet the requirement, the first: the clear water level in the cleaning membrane tank is required; secondly, the method comprises the following steps: the aeration butterfly valve needs to perform corresponding actions;
the clean water liquid level requirement of the cleaning membrane tank is as follows: the clear water level of the cleaning membrane pool is about 10 cm lower than the liquid level of other membrane pools; the air flow for cleaning the membrane tank is increased by reducing the water pressure for cleaning the membrane tank;
the requirements on the aeration butterfly valve are as follows: in the full water aeration stage of the cleaning membrane tank, the backwashing pump works for 1 minute every 5 minutes; back washing the membrane filaments from inside to outside through a back washing pipeline;
meanwhile, the pressure value of the backwashing pipeline is compared with a standard value of pressure value, and the reagent adding concentration and the reagent soaking time required in the Step4 stage are adjusted in time, wherein the pressure value of the backwashing pipeline is a numerical value read from a backwashing pressure gauge;
step 3: the second time of emptying the cleaning membrane pool;
after the time of soaking in clear water and aerating in the Step2 reaches 30 minutes, repeating the Step1 to empty the cleaning membrane pool for the second time;
step 4: cleaning a membrane tank, supplementing water, adding medicine, soaking and backwashing;
firstly, supplementing water into a cleaning membrane pool, adding a medicament while supplementing water, soaking after the water supplementing is finished, and adjusting the soaking time calculated in the Step2 stage according to the pressure on a backwashing pipeline in the water supplementing process;
in this stage, need open backwash pump, backwash valve, moisturizing valve and carry out the moisturizing, the liquid level that washs the membrane pond needs to reach La, wherein:
L N the liquid level of each membrane pool;
la: average liquid levels of the N membrane tanks;
after the medicine is added and the soaking is carried out for 15 minutes, the soaking time is calculated according to the backwashing pressure displayed on the backwashing pressure gauge, and the method comprises the following specific steps:
(1) closing the water replenishing valve, opening the backwashing valve and opening the backwashing pump to enable the backwashing pump to operate at a fixed frequency f, and acquiring pressure data P of a backwashing pressure gauge after the backwashing pump operates for 20 seconds Trans 1 (unit: Kpa), the backwash pump is turned off after 25 seconds of operation of the backwash pump, P Trans 1 Is the average value of the data of 20-25 seconds;
(2) and (3) calculating the soaking time according to the collected backwashing pressure, wherein the calculation method comprises the following steps:
wherein, T 1 Soaking time (unit: min);
ps: setting a standard pressure value (unit: Kpa), wherein the standard pressure value is the pressure of the last cleaning and the last backwashing of the membrane pool and is used as the standard pressure value;
Ψ t : time coefficient (1 ≦ Ψ modified according to the age of the membrane module t 1≤10)；
Γ t : aging coefficient of the membrane module (increasing by 0 ≦ Γ with the increase of the service life of the membrane module t ≤5)；
F, cleaning the average flow (m) of produced water of the membrane pool in the previous period 3 /h)
Fit: average frequency (Hz) of operation of cleaning previous cycle water pump
In addition, T 1 The value range is T being more than or equal to 45 1 Less than or equal to 150; i.e. T is greater than 150 minutes calculated by formula 1 Taking for 150 minutes;
(3) the membrane pool control system starts the detection of the backwashing pressure every 15 minutes and detects the backwashing pressure according to the numerical value P of the backwashing pressure gauge Trans N The soaking time is calculated according to the formula：
Wherein, T N The soaking time (unit: min) calculated by the Nth detection;
P trans N The backwash pipeline pressure value detected by a backwash pressure gauge read in the Nth detection;
f, cleaning the average flow (m) of produced water of the membrane tank in the previous period 3 /h)
Fit: average frequency (Hz) of operation of cleaning previous cycle water pump
N is the number of times 2-8 (unit: min) T1-8;
step 5: the third evacuation of the cleaning membrane tank;
when N is less than 8 and the detection result of two continuous backwashing is T <15 x (8-N), the membrane cleaning pool is emptied for three times, and water is normally produced;
after the medicine adding soaking is finished, the membrane pool can be continuously emptied, and a water inlet and outlet gate is opened to produce water;
if the water inlet gate is directly opened to produce water, the concentration of the outlet water is higher, and in order to avoid the problem, the outlet water is emptied for the third time to reduce the components of the medicament added in the sewage;
step 6: normal water production;
when N is 8 and T is more than or equal to 15, Step4 ends the membrane pool control system to alarm and inform; if T calculated through the 8 times of operations is more than or equal to 15, the soaking and backwashing work of the membrane pool is finished, the backwashing soaking is proved to not achieve the expected effect, and corresponding alarm informing actions are made in the control system;
through the operation, the cleaning and soaking time of the membrane tank can be greatly shortened, and the cleaning efficiency of the membrane tank is improved.
The backwashing process in this application is: and (4) starting the backwashing pump under the condition that the water replenishing valve is closed, so that the clean water enters the membrane tank through the membrane filaments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (7)
1. An intelligent cleaning method for an MBR (membrane bioreactor), which comprises the following steps:
the membrane pool is internally provided with an ultrasonic liquid level meter and an aeration system;
the membrane assembly is arranged in the membrane pool;
the backwashing pump is connected with a backwashing main pipe, and the backwashing main pipe is connected with a backwashing pipeline for communication;
a backwashing pressure gauge and an electromagnetic flowmeter are arranged on the backwashing main pipe;
a first branch backwashing pipeline is communicated with the backwashing pipeline, the first branch backwashing pipeline is simultaneously communicated with the backwashing main pipe and the backwashing main pipe, and a backwashing valve is arranged on the first branch backwashing pipeline;
a second branch backwashing pipeline is communicated with the backwashing pipeline, each second branch backwashing pipeline is communicated with the backwashing pipeline and the membrane pool, and a water replenishing valve is arranged on each second branch backwashing pipeline;
the water production pipeline is communicated with the membrane pool, and a water production pressure gauge is arranged on the water production pipeline;
the aeration system comprises an air blower, a plurality of sets of aeration branch pipes and a plurality of pneumatic butterfly valves, the plurality of sets of aeration branch pipes are communicated with the air blower, one pneumatic butterfly valve is installed on one aeration branch pipe, and the aeration branch pipes are communicated with the membrane tank;
n membrane tanks are arranged, wherein N is an integer and is more than or equal to 2;
m membrane assemblies are arranged in each membrane pool, and M is more than or equal to 1;
n water production pipelines are arranged and are respectively communicated with the N membrane tanks;
the membrane pool control system is connected with the ultrasonic liquid level meter, the membrane component, the backwashing pump, the backwashing pressure gauge, the electromagnetic flowmeter, the backwashing valve, the water replenishing valve, the water production pressure gauge, the air blower and the plurality of pneumatic butterfly valves;
the method is characterized in that: the intelligent cleaning method of the MBR membrane bioreactor comprises the following steps:
step 1: first evacuation of the membrane tank to be cleaned;
in the primary emptying stage of the cleaning membrane pool, firstly, the liquid level starts emptying countdown, a time point t1 is taken to record the liquid level H1 at the time of t1, and t1 is more than or equal to 1 (unit: min); when the time reaches t2 after a period of time, recording the liquid level H2 at the time of t2, wherein the unit is min from t2 to t 1;
and calculating the emptying time t according to an emptying algorithm:
according to the calculation result, starting a backwashing pump, opening a backwashing valve and closing a water replenishing valve 5 minutes before the emptying pump stops;
step 2: water replenishing, aeration and backwashing of the cleaning membrane tank;
the method comprises the following steps of firstly, supplementing water to a cleaning membrane pool, in the process of supplementing water to the cleaning membrane pool, repeatedly and circularly closing and opening alternate actions of a water supplementing valve, closing a pneumatic butterfly valve on an aeration branch pipe of an aeration system positioned outside the cleaning membrane pool, opening the pneumatic butterfly valve on the aeration branch pipe connected with the cleaning membrane pool, communicating the aeration branch pipe connected with the cleaning membrane pool with an air blower, and aerating the cleaning membrane pool by the air blower in a mode that the aeration branch pipes are connected in parallel;
in the aeration process when water supplement is completed, a backwashing pump performs backwashing from inside to outside on membrane filaments through a backwashing pipeline;
meanwhile, the backwash pipeline pressure value is compared with a standard value pressure value, the reagent adding concentration and the reagent soaking time required in the Step4 stage are adjusted in time, and the backwash pipeline pressure value is a numerical value read from a backwash pressure gauge;
step 3: the second time of emptying the cleaning membrane pool;
after the time of soaking in clear water and aerating in the Step2 reaches the set time, repeating the Step1 to empty the cleaning membrane pool for the second time;
step 4: cleaning a membrane tank, supplementing water, adding medicine, soaking and backwashing;
firstly, supplementing water into a cleaning membrane pool, adding a medicament while supplementing water, soaking after the water supplementing is finished, and adjusting the soaking time calculated in the Step2 stage according to the pressure on a backwashing pipeline in the water supplementing process;
in the stage, a backwashing pump, a backwashing valve and a water replenishing valve need to be opened for replenishing water, and the liquid level of the cleaning membrane tank needs to reach La;
after the drugs are added and soaked for 15 minutes, the soaking time is calculated according to the backwashing pressure displayed on the backwashing pressure gauge;
step 5: the third time of emptying the cleaning membrane pool;
step 6: normally produce water.
2. The intelligent cleaning method for the MBR membrane bioreactor of claim 1, which is characterized in that: step1, the starting level of membrane pool emptying versus time is: h ═ Kt + b;
wherein:
k is the slope of the line in FIG. 4;
b is the initial liquid level of the membrane pool;
therefore, from time t2, the evacuation time t required for evacuation is:
(t is the time required for evacuation);
3. the intelligent cleaning method for the MBR membrane bioreactor of claim 1, which is characterized in that: in step2, the clear water level in the cleaning membrane pool is lower than the other membrane pool levels.
4. The intelligent cleaning method of the MBR membrane bioreactor of claim 3, which is characterized in that: in stage Step 4:
L N the liquid level of each membrane pool;
la: the highest liquid level set point in the wash.
5. The intelligent cleaning method of the MBR membrane bioreactor as set forth in claim 1, wherein: in Step4, the calculation Step of the soaking time comprises the following steps:
(1) closing a water supply valve, opening a backwashing valve and opening a backwashing pump to enable the backwashing pump to operate at a fixed frequency f, and acquiring pressure data P of a backwashing pressure gauge after the backwashing pump operates for 20 seconds Trans 1 (unit: Kpa), the backwash pump is turned off after 25 seconds of operation of the backwash pump, P Trans 1 Is the average value of the data of 20-25 seconds;
(2) and (3) calculating the soaking time according to the collected backwashing pressure, wherein the calculation method comprises the following steps:
wherein, T 1 Soaking time (unit: min);
ps: setting a standard pressure value (unit: Kpa), wherein the standard pressure value is the pressure of the last cleaning and the last backwashing of the membrane pool and is used as the standard pressure value;
Ψ t : time coefficient (1 ≦ Ψ modified according to the age of the membrane module t ≤10)；
Γ t : the aging coefficient of the membrane component (the aging coefficient of the membrane component increases by 1 ≦ Γ along with the increase of the service life of the membrane component t ≤5)；
F, cleaning the average flow (m) of produced water of the membrane tank in the previous period 3 /h)
Fit: average frequency (Hz) of operation of cleaning previous cycle water pump
In addition, T 1 The value range is T being more than or equal to 45 1 ≤150；I.e. T is greater than 150 minutes calculated by formula 1 Taking for 150 minutes;
(3) the membrane pool control system starts the detection of the backwashing pressure every 15 minutes and according to the numerical value P of the backwashing pressure gauge Trans N And (3) calculating the soaking time, wherein the calculation formula is as follows:
wherein, T N Soaking time (unit: min) calculated by the Nth detection;
P trans N Reading a backwash pipeline pressure value detected by a backwash pressure gauge in the Nth detection;
f, cleaning the average flow (m) of produced water of the membrane tank in the previous period 3 /h)
Fit: average frequency (Hz) of operation of cleaning previous cycle water pump
The number of times of N is more than or equal to 2 and less than or equal to 8 (unit: min).
6. The intelligent cleaning method of the MBR membrane bioreactor as set forth in claim 5, wherein: and when N is more than or equal to 2 and less than 8 and the result of the two continuous backwashing detections is T <15 x (8-N), the Step5 is carried out, and the membrane pool is cleaned for the third emptying.
7. The intelligent cleaning method of the MBR membrane bioreactor as set forth in claim 5, wherein: and when N is 8 and T is more than or equal to 15, Step4 is ended, and the membrane pool control system gives an alarm to inform action.
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