CN116409869A - Online back flushing device and method for membrane concentration reactor - Google Patents
Online back flushing device and method for membrane concentration reactor Download PDFInfo
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- 239000012528 membrane Substances 0.000 title claims abstract description 112
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000003814 drug Substances 0.000 claims abstract description 24
- 238000005273 aeration Methods 0.000 claims abstract description 21
- 238000002791 soaking Methods 0.000 claims abstract description 13
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 11
- 231100000719 pollutant Toxicity 0.000 claims abstract description 11
- 239000011259 mixed solution Substances 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000010008 shearing Methods 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims description 49
- 239000003795 chemical substances by application Substances 0.000 claims description 37
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 30
- 238000005406 washing Methods 0.000 claims description 26
- 230000001960 triggered effect Effects 0.000 claims description 21
- 238000012423 maintenance Methods 0.000 claims description 16
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical group C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 14
- 238000011001 backwashing Methods 0.000 claims description 12
- 239000013043 chemical agent Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 10
- 238000005276 aerator Methods 0.000 claims description 10
- 235000006408 oxalic acid Nutrition 0.000 claims description 10
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 7
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical group [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 5
- 235000015165 citric acid Nutrition 0.000 claims description 5
- SATVIFGJTRRDQU-UHFFFAOYSA-N potassium hypochlorite Chemical compound [K+].Cl[O-] SATVIFGJTRRDQU-UHFFFAOYSA-N 0.000 claims description 5
- 230000004907 flux Effects 0.000 abstract description 8
- 238000011084 recovery Methods 0.000 abstract description 8
- 239000010802 sludge Substances 0.000 abstract description 7
- 230000009471 action Effects 0.000 abstract description 5
- 230000007246 mechanism Effects 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 230000009977 dual effect Effects 0.000 abstract 1
- 239000012459 cleaning agent Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011020 pilot scale process Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
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- 239000007789 gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
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- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004094 preconcentration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/006—Regulation methods for biological treatment
-
- 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
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/44—Time
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Biodiversity & Conservation Biology (AREA)
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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Abstract
The invention relates to an online back flushing device and method of a membrane concentration reactor, comprising a back flushing water tank, a back flushing pump, a dosing pump, an automatic control system and the like. When the transmembrane pressure difference of the membrane concentration reactor continuously exceeds a set value for 5min, stopping water production and aeration, discharging part of concentrated solution to reduce the liquid level, injecting clear water/medicament mixed solution into the membrane wire through a pipeline mixer, and carrying out hydraulic recoil to effectively separate pollutants from the membrane wire; and closing the back flushing pump and the dosing pump, soaking for a certain time, then aerating, providing shearing force on the outer surface of the membrane wire, and coupling the action of water vapor to further realize effective stripping of pollutants. The invention can design a reasonable trigger mechanism according to the running characteristics of the reactor even in a membrane concentration reactor with extremely high sludge concentration, couple the dual advantages of gas and water backflushing, simultaneously realize the effective recovery of flux by utilizing the chemical action of the medicament, maintain the high-efficiency and stable running of the reactor, and realize automatic online backflushing with simple operation.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an online backwashing device and method for a membrane concentration reactor.
Background
The membrane concentration reactor system based on the membrane technology has the advantages of good solid-liquid separation effect, small occupied area and high effluent quality, and is a compact and efficient novel sewage pre-concentration technology. However, the concentration of sludge in the membrane concentration reactor is extremely high, and some of the sludge is even 50-100 times that of the traditional activated sludge technology, so that the problem of membrane pollution is more prominent and severe compared with the traditional MBR technology, and the development of effective membrane pollution control measures is a key point for realizing continuous and stable operation of the membrane concentration reactor. The conventional back flushing measures mainly aim at the low-concentration membrane tank mixed liquid, and for the membrane concentration reactor, the conventional back flushing measures have poor flux recovery effect, and the conventional back flushing measures usually adopt a medicament pouring injection mode, so that the mode needs whole-course aeration, the energy consumption and the medicament cost are greatly improved, and the operation cost of the membrane reactor is greatly improved; because of the large amount of medicaments, the fluctuation of the pH value in the membrane tank is caused, which is not beneficial to the stable operation of the system; the triggering mechanism of back flushing is not clear, and professional personnel often perform back flushing according to operation experience or a fixed period, so that the high-efficiency stable operation of the system is difficult to maintain; in the early foreign pilot scale research, researchers adopt a daily off-line chemical cleaning method for cleaning membrane pollution, and the concentration of the medicament is high, so that continuous operation is difficult to realize in pilot scale and actual production.
Disclosure of Invention
The invention provides an online back flushing device and method for a membrane concentration reactor, which aim to effectively recover membrane wire flux of a membrane concentration reactor system and meet the requirement of continuous and stable operation of the system.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
an online back flushing device of a membrane concentration reactor comprises an aerator, a pipeline mixer, a dosing pump, a chemical agent box, a back flushing pump, a back flushing water tank and a water guide pipe, wherein the components are connected with an automatic control system so as to be convenient for automatic operation, and a water outlet arranged at the bottom of the back flushing water tank is communicated with a water inlet of the back flushing pump; one end of the dosing pump is connected to the chemical agent box, and the other end of the dosing pump is connected to the pipeline mixer together with the water outlet of the back flushing pump; one end of the water guide pipe is connected with the pipeline mixer, and the other end of the water guide pipe is communicated with the top of the membrane wire in the membrane concentration reactor and is used for injecting clear water/medicament mixed solution into the membrane wire; one end of the air inlet electromagnetic valve is connected with an aerator, and the other end of the air inlet electromagnetic valve is connected to the bottom of the membrane concentration reactor through an air duct.
The effective volume of the back flushing water tank is 4m 3 The water outlet of the back flushing water tank is arranged at a position 10cm away from the bottom.
When the back washing agent arranged in the chemical agent box is an alkaline washing agent, the concentration of the back washing agent is 1000-5000ppm, and the alkaline washing agent is sodium hypochlorite, potassium hypochlorite or hydrogen peroxide; when the back flushing agent is an acid washing agent, the concentration is 1000-3000ppm, and the acid washing agent is citric acid, oxalic acid or oxalic acid.
When triggering maintenance cleaning, the soaking process time is 30-45min; when the restorative cleaning is triggered, the soaking time is 6-10h.
When triggering maintenance cleaning, the aeration process time is 30-45min; when the restorative cleaning is triggered, the aeration time is 6-10h.
An online back flushing method of a membrane concentration reactor comprises the following steps:
step 1: when the transmembrane pressure difference of the membrane concentration reactor continuously exceeds a set value for 5min, the automatic control system stops the water production step and simultaneously stops aeration, and the transmembrane pressure difference set value is 35kPa;
step 2: discharging the concentrated solution in the membrane concentration reactor through a mud discharging device to reduce the liquid level;
step 3: the back flushing water tank is filled with clear water, a back flushing agent is arranged in the chemical agent tank, a back flushing pump and a dosing pump are simultaneously opened, and the clear water and the agent are fully and uniformly mixed through a pipeline mixer and then are filled into the membrane wires of the membrane concentration reactor in a back flushing mode through a water guide pipe;
step 4: closing the back flushing pump and the dosing pump to soak the membrane component in the membrane reactor in the clear water/medicament mixed solution;
step 5: opening an aerator and an air inlet electromagnetic valve, and aerating the membrane concentration reactor through an air guide pipe, so as to provide shearing force for the outer surface of the membrane wire and remove pollutants on the surface of the membrane wire;
step 6: repeating the steps, repeating the steps 3-5 when the restorative cleaning is triggered, washing with acid and then washing with alkali, and directly resuming the operation of the equipment after the step 5 is completed when the maintainable cleaning is triggered.
The effective volume of the back flushing water tank is 4m 3 The water outlet of the back flushing water tank is arranged at a position 10cm away from the bottom.
When the back washing agent is an alkaline washing agent, the concentration of the back washing agent is 1000-5000ppm, and the alkaline washing agent is sodium hypochlorite, potassium hypochlorite or hydrogen peroxide; when the back flushing agent is an acid washing agent, the concentration is 1000-3000ppm, and the acid washing agent is citric acid, oxalic acid or oxalic acid.
In the step 4, when the maintainability cleaning is triggered, the soaking process time is 30-45min; when the restorative cleaning is triggered, the soaking time is 6-10h.
In the step 5, when the maintenance cleaning is triggered, the aeration process time is 30-45min; when the restorative cleaning is triggered, the aeration time is 6-10h.
Compared with the back flushing measure of the prior common membrane device, the invention has the following advantages and beneficial effects:
analyzing the running condition of the equipment by an automatic control system, triggering different back flushing modes, and combining maintainability cleaning and restorability cleaning to realize the high-efficiency stable running of the system;
in the back flushing process, chemical agents are well configured outside the membrane tank to be injected into the membrane wires of the membrane concentration reactor through the pipeline mixer and the water guide pipe, so that the back flushing agents are uniformly distributed in the membrane tank, and pollutants accumulated in the membrane wires are effectively removed; and due to the hydraulic recoil action of the clean water/medicament, the pollutants on the outer surface of the membrane wire are rapidly separated; in addition, aeration is carried out on the outer surface of the membrane wire, lateral shearing force is provided, water-gas cooperative coupling chemical recoil is realized, removal of pollutants on the surface of the membrane wire can be effectively realized, and flux is effectively recovered;
the continuous and stable operation of the system is realized by alternately performing on-line maintenance cleaning and on-line recovery cleaning.
Drawings
FIG. 1 is a schematic diagram of an on-line backwash device of a membrane concentration reactor according to an embodiment of the present invention;
FIG. 2 is a graph of time-transmembrane pressure differential according to an embodiment of the present invention.
Detailed Description
The construction and operation of the present invention will be described in detail with reference to the accompanying drawings and examples.
In order to solve the problems of serious membrane pollution, high offline cleaning frequency and incapability of independent continuous operation caused by high sludge concentration of a membrane concentration reactor, the invention provides an online back flushing device and method for the membrane concentration reactor, which can realize effective recovery of membrane flux in pilot-scale equipment of the large-scale membrane concentration reactor, realize continuous and stable operation of the reactor and avoid high-frequency offline cleaning.
The invention provides an online back flushing device and method for a membrane concentration reactor, which comprise different back flushing mode triggering mechanisms, devices and methods. The back flushing is on-line back flushing, each part of the back flushing system is connected with an automatic control system, automatically operates according to the running condition of equipment and the set period of a program, and is divided into maintenance cleaning and recovery cleaning according to the dosing concentration and the back flushing time.
The maintenance cleaning is controlled by the combination of the transmembrane pressure difference value and the running time, the recovery cleaning is controlled by the combination of the transmembrane pressure difference value and the increasing rate thereof, the transmembrane pressure difference set value is recommended to be 35kPa, and the increasing rate set value is 1.5kPa/h. When the continuous operation time of the equipment reaches 3d, triggering maintenance cleaning no matter the transmembrane pressure difference; when the transmembrane pressure difference is more than the preset value for more than 5 minutes continuously, triggering maintenance cleaning no matter the continuous operation time; and triggering the restorative cleaning when the transmembrane pressure difference value is greater than a set value for more than 5 minutes continuously and the growth rate exceeds the set value.
As shown in FIG. 1, in the embodiment of the online back flushing device and method of the membrane concentration reactor, the back flushing device specifically comprises a back flushing water tank 9, a back flushing pump 8, a dosing pump 6, a chemical agent tank 7, a pipeline mixer 4, a water guide pipe 11 and an aerator 3, wherein each component is connected with an automatic control system 10 so as to be convenient for automatic operation, each step can be automatically operated according to a set program, and a water outlet arranged at the bottom of the back flushing water tank 9 is communicated with a water inlet of the back flushing pump 8; one end of the dosing pump 6 is connected to the chemical agent box 7, and the other end of the dosing pump is connected to the pipeline mixing 4 together with the water outlet of the back flushing pump 8; one end of the water guide pipe 11 is connected with the pipeline mixer 4, and the other end of the water guide pipe is communicated with the top of the membrane wire in the membrane concentration reactor 1 and is used for injecting clear water/medicament mixed solution into the membrane wire; one end of the air inlet electromagnetic valve 12 is connected with the aerator 3, and the other end is connected with the bottom of the membrane concentration reactor 1 through an air duct;
the back flushing water tank 9 and the back flushing pump 8 are matched with the design treatment water quantity of the membrane concentration reactor 1, and the reference effective volume is 4m 3 A water outlet is arranged at a position 10cm away from the bottom of the back flush water tank 9, the water outlet is communicated with the water inlet of the back flush pump 8, and the flow range of the back flush pump 8 is 5-15m 3 /h; when the flow is large, the backflushing flow velocity is large, the generated hydraulic effect is strong, and the stripping of pollutants from the surface of the membrane wire is facilitated.
A membrane concentration reactor backwash method comprising the steps of:
step 1: when the transmembrane pressure difference of the membrane concentration reactor continuously exceeds a set value for 5min, the automatic control system 10 stops the water production step and simultaneously stops aeration, and the transmembrane pressure difference set value is referenced as 35kPa;
step 2: a part of concentrated solution in the reactor is discharged through the sludge discharge device 5, so that the liquid level is reduced, overflow caused by adding back flushing water into the membrane tank is prevented, the concentration of the concentrated solution in the membrane tank can be reduced, and flux recovery is facilitated;
step 3: injecting clear water into the back flush water tank 9, configuring a back flush medicament in the chemical medicament tank 7, simultaneously opening the back flush pump 8 and the medicament adding pump 6, fully and uniformly mixing the clear water and the medicament through the pipeline mixer 4, injecting the mixture into the membrane wires of the membrane concentration reactor 1 in a back flush mode through the water guide pipe 11, and adjusting the adding concentration of the back flush medicament according to the flow of the medicament adding pump;
step 4: stopping the back flushing pump 8 and the dosing pump 6 to fully soak the clear water/medicament mixed solution and the inner membrane component of the membrane reactor, wherein the soaking time is determined by the back flushing type, and the soaking process time is 30-45min when maintenance cleaning is performed; when the restorative cleaning is carried out, the soaking time is 6-10h;
step 5: after a certain period of time, opening an aerator 3 and an air inlet electromagnetic valve 12, and aerating the membrane wires in the membrane concentration reactor 1 through an air duct 11, so as to provide shearing force for the outer surfaces of the membrane wires to remove pollutants on the surfaces of the membrane wires, wherein the aeration time is 30-45min when maintenance cleaning is performed according to different aeration time of cleaning types; when the recovery cleaning is carried out, the aeration time is 6-10h;
step 6: repeating the steps, repeating the steps 3-5 when the restorative cleaning is triggered, washing with acid and then washing with alkali, and directly resuming the operation of the equipment after the step 5 is completed when the maintainable cleaning is triggered.
When the maintenance cleaning is triggered in the step 1, the back flushing agent is an alkaline cleaning agent, the concentration of the back flushing agent is 1000-5000ppm, and the back flushing agent is an alkaline cleaning process; when the restorative cleaning is triggered in the step 1, the back flushing agent is an acid cleaning agent and then an alkali cleaning agent, wherein the concentration of the acid cleaning agent is 1000-3000ppm, and the concentration of the alkali cleaning agent is 1000-5000ppm;
the alkaline washing agent is one or a mixture of more of sodium hypochlorite, potassium hypochlorite and hydrogen peroxide; the acid washing agent is one or more of citric acid, oxalic acid and oxalic acid.
The online back flushing device and method for the membrane concentration reactor are suitable for only pickling, only alkaline washing or pickling and then alkaline washing;
furthermore, one end of the water guide pipe 11 is communicated with the outlet of the pipeline mixer 4, and the other end of the water guide pipe is communicated with the top of the membrane wire, so that the mixed solution of clean water and chemical agent is injected into the membrane wire, and hydraulic recoil is performed while chemical agent with a certain concentration is provided, so that the effective separation of pollutants and the membrane wire is realized;
furthermore, the aerator is communicated with the bottom of the membrane concentration reactor 1, lateral shearing force is provided outside the membrane wires through the action of gas surface flushing, and the water vapor action is coupled, so that the effective stripping of pollutants is further realized.
The invention relates to an on-line backwashing device and method for a membrane concentration reactor, which are implemented by taking backwashing of a bio-chemical reinforced membrane concentration reactor as an example. Treatment scale 500m 3 A/d bio-chemically amplified membrane concentration reactor having an effective working volume of about 20m 3 The device is used for continuously treating urban domestic sewage, when the transmembrane pressure difference continuously exceeds a 35kPa set value for 5min, maintenance cleaning is triggered, at the moment, water production and aeration are stopped, a sludge discharge system 5 is started, the effective liquid level is reduced to 2.00m from 2.54m, clean water is injected into a back flush water tank 9, a dosing pump 6 and a back flush pump 8 are opened, meanwhile, a matched valve on a pipeline is opened, the clean water and a medicament are uniformly mixed through a pipeline mixer 4 to form sodium hypochlorite solution with the concentration of 2000ppm, the sodium hypochlorite solution is injected into a membrane wire through a water guide pipe 11 at the top of the membrane wire, the water flow direction is radial flow, aeration is stopped, aeration is continued after soaking for 30min, the operation is resumed after aeration for 30min, and the change of the operation pressure is observed. As shown in FIG. 2, the pressure reaches a set value of 35kPa before cleaning, the transmembrane pressure difference after backwashing is significantly reduced, and the membrane pressure difference is kept stable for a certain operation time.
When the bio-chemical enhanced membrane concentration reactor runs for more than half a year, the membrane flux is not obviously reduced by the alternate running of maintenance cleaning and restorative cleaning, and the flux can be effectively restored by back flushing, so that the invention greatly improves the running independence and stability of the bio-chemical enhanced membrane concentration reactor, and effectively relieves the membrane pollution.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (10)
1. An online back flush device of a membrane concentration reactor, which is characterized in that: the automatic control device comprises an aerator (3), a pipeline mixer (4), a dosing pump (6), a chemical agent box (7), a back flushing pump (8), a back flushing water tank (9) and a water guide pipe (11), wherein the components are connected with an automatic control system (10) so as to be convenient for automatic operation, and a water outlet arranged at the bottom of the back flushing water tank (9) is communicated with a water inlet of the back flushing pump (8); one end of the dosing pump (6) is connected to the chemical agent box (7), and the other end of the dosing pump is connected to the pipeline mixer (4) together with the water outlet of the back flushing pump (8); one end of the water guide pipe (11) is connected with the pipeline mixer (4), and the other end of the water guide pipe is communicated with the top of the inner membrane wire of the membrane concentration reactor (1) and is used for injecting clear water/medicament mixed solution into the membrane wire; one end of the air inlet electromagnetic valve (12) is connected with the aerator (3), and the other end is connected with the bottom of the membrane concentration reactor (1) through an air duct.
2. The membrane concentration reactor on-line backwash apparatus of claim 1, wherein: the effective volume of the back flushing water tank (9) is 4m 3 The water outlet of the back flushing water tank (9) is arranged at a position 10cm away from the bottom.
3. The membrane concentration reactor on-line backwash apparatus of claim 1, wherein: when the back washing agent arranged in the chemical agent box (7) is an alkaline washing agent, the concentration of the back washing agent is 1000-5000ppm, and the alkaline washing agent is sodium hypochlorite, potassium hypochlorite or hydrogen peroxide; when the back flushing agent is an acid washing agent, the concentration is 1000-3000ppm, and the acid washing agent is citric acid, oxalic acid or oxalic acid.
4. An on-line backwash assembly for a membrane concentration reactor as claimed in claim 1 wherein: when triggering maintenance cleaning, the soaking process time is 30-45min; when the restorative cleaning is triggered, the soaking time is 6-10h.
5. An on-line backwash assembly for a membrane concentration reactor as claimed in claim 1 or 4 wherein: when triggering maintenance cleaning, the aeration process time is 30-45min; when the restorative cleaning is triggered, the aeration time is 6-10h.
6. An online back flushing method of a membrane concentration reactor is characterized by comprising the following steps:
step 1: when the transmembrane pressure difference of the membrane concentration reactor (1) continuously exceeds a set value for 5min, the automatic control system (10) stops the water production step and simultaneously stops aeration, and the transmembrane pressure difference set value is 35kPa;
step 2: discharging the concentrated solution in the membrane concentration reactor (1) through a mud discharging device (5) to reduce the liquid level;
step 3: the clear water is injected into the back flushing water tank (9), a back flushing medicament is arranged in the chemical medicament tank (7), a back flushing pump (8) and a medicament adding pump (6) are simultaneously opened, and the clear water and the medicament are fully and uniformly mixed through the pipeline mixer (4) and then injected into the membrane wires of the membrane concentration reactor (1) in a back flushing mode through the water guide pipe (11);
step 4: closing a back flushing pump (8) and a dosing pump (6) to enable the inner membrane component of the membrane reactor (1) to be soaked in the clear water/medicament mixed solution;
step 5: opening an aerator (3) and an air inlet electromagnetic valve (12), and aerating into the membrane concentration reactor (1) through an air duct, so as to provide shearing force for the outer surface of the membrane wire and remove pollutants on the surface of the membrane wire;
step 6: repeating the steps, repeating the steps 3-5 when the restorative cleaning is triggered, washing with acid and then washing with alkali, and directly resuming the operation of the equipment after the step 5 is completed when the maintainable cleaning is triggered.
7. The on-line back flushing method of a membrane concentration reactor according to claim 6, wherein: the effective volume of the back flushing water tank (9) is 4m 3 The water outlet of the back flushing water tank (9) is arranged at a position 10cm away from the bottom.
8. The on-line back flushing method of a membrane concentration reactor according to claim 6, wherein: when the back washing agent is an alkaline washing agent, the concentration of the back washing agent is 1000-5000ppm, and the alkaline washing agent is sodium hypochlorite, potassium hypochlorite or hydrogen peroxide; when the back flushing agent is an acid washing agent, the concentration is 1000-3000ppm, and the acid washing agent is citric acid, oxalic acid or oxalic acid.
9. The on-line back flushing method of a membrane concentration reactor according to claim 6, wherein: in the step 4, when the maintainability cleaning is triggered, the soaking process time is 30-45min; when the restorative cleaning is triggered, the soaking time is 6-10h.
10. An on-line back flushing method of a membrane concentration reactor as claimed in claim 6 or 9, wherein: in the step 5, when the maintenance cleaning is triggered, the aeration process time is 30-45min; when the restorative cleaning is triggered, the aeration time is 6-10h.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111672822.0A CN116409869A (en) | 2021-12-31 | 2021-12-31 | Online back flushing device and method for membrane concentration reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111672822.0A CN116409869A (en) | 2021-12-31 | 2021-12-31 | Online back flushing device and method for membrane concentration reactor |
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| CN116409869A true CN116409869A (en) | 2023-07-11 |
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| CN202111672822.0A Pending CN116409869A (en) | 2021-12-31 | 2021-12-31 | Online back flushing device and method for membrane concentration reactor |
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| Country | Link |
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| CN (1) | CN116409869A (en) |
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