CN217103214U - Online back flush device of membrane concentration reactor - Google Patents
Online back flush device of membrane concentration reactor Download PDFInfo
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- CN217103214U CN217103214U CN202123427954.5U CN202123427954U CN217103214U CN 217103214 U CN217103214 U CN 217103214U CN 202123427954 U CN202123427954 U CN 202123427954U CN 217103214 U CN217103214 U CN 217103214U
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Abstract
The utility model relates to an online back-flushing device of a membrane concentration reactor, which comprises 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, draining part of concentrated solution to reduce the liquid level height, injecting clear water/medicament mixed solution into the membrane filaments through a pipeline mixer, and performing hydraulic recoil to realize effective separation of pollutants and the membrane filaments; and (4) closing the back washing pump and the dosing pump, aerating after soaking for a certain time, providing shearing force on the outer surface of the membrane wire, and coupling the action of water and gas to further realize effective stripping of pollutants. The utility model discloses even in the membrane concentration reactor that mud concentration is extremely high, also can be according to the reasonable in design's of reactor operation characteristics trigger mechanism, the dual advantage of coupling gas, water recoil utilizes the chemical action of medicament simultaneously, realizes the effective recovery of flux, maintains the high-efficient steady operation of reactor, easy operation realizes automatic online back flush.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, concretely relates to membrane concentration reactor is anti-washing unit on line.
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 new sewage pre-concentration technology. However, the concentration of sludge in the membrane concentration reactor is very high, some sludge is even 50-100 times of that of the traditional activated sludge technology, compared with the traditional MBR technology, the problem of membrane pollution is more prominent and severe, and the development of effective membrane pollution control measures is the key point for realizing the continuous and stable operation of the membrane concentration reactor. The conventional backwashing measures are mainly aimed at low-concentration membrane pool mixed liquid, the conventional backwashing measures have poor recovery effect on flux for a membrane concentration reactor, and the conventional backwashing measures usually adopt a medicament dumping and injecting mode, which needs whole-process aeration, greatly improves energy consumption and medicament cost, and greatly improves the operating cost of the membrane reactor; the fluctuation of the pH value in the membrane tank is caused due to the addition of a large amount of the medicament, so that the stable operation of the system is not facilitated; the triggering mechanism of the backwashing is not clear, and a professional often performs backwashing according to the operation experience or a fixed period, so that the efficient and stable operation of the system is difficult to maintain; in the early foreign small-scale test research, researchers adopt daily off-line chemical cleaning means for realizing the cleaning of membrane pollution, and the medicament concentration is high, so that continuous operation is difficult to realize in pilot plant test and actual production.
SUMMERY OF THE UTILITY MODEL
The utility model provides an online back-flushing device of membrane concentration reactor strives to realize the effective recovery of membrane concentration reactor system membrane silk flux, satisfies the demand of the continuous steady operation of system.
In order to realize the purpose, the utility model discloses a technical scheme as follows:
an online backwashing device of a membrane concentration reactor comprises an aerator, a pipeline mixer, a dosing pump, a chemical agent box, a backwashing pump, a backwashing water tank and a water guide pipe, wherein all the components are connected with an automatic control system so as to facilitate automatic operation, and a water outlet arranged at the bottom of the backwashing water tank is communicated with a water inlet of the backwashing pump; one end of the chemical feeding pump is connected to the chemical agent box, and the other end of the chemical feeding pump and the water outlet of the back flush pump are connected to the pipeline mixer; 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 filaments in the membrane concentration reactor and is used for injecting clear water/medicament mixed liquid into the membrane filaments; 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 backwashing water tank is 4m 3 And the water outlet of the backwashing 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 alkali washing agent, the concentration of the alkali washing agent is 1000-5000ppm, and the alkali washing agent is sodium hypochlorite, potassium hypochlorite or hydrogen peroxide; when the backwashing 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 the maintenance cleaning is triggered, the soaking time is 30-45 min; when the restorative cleaning is triggered, the soaking time is 6-10 h.
When the maintenance cleaning is triggered, the aeration process time is 30-45 min; when the recovery cleaning is triggered, the aeration time is 6-10 h.
The utility model discloses compare in the back flush measure of current ordinary membrane device, have following advantage and beneficial effect:
the running condition of the equipment is analyzed through an automatic control system, so that different backwashing modes are triggered, and the efficient and stable running of the system is realized by combining maintainability washing and restorability washing;
in the back washing process, in order to avoid pouring injection of the medicament, the chemical medicament is well configured outside the membrane tank and is injected into the membrane filaments of the membrane concentration reactor through the pipeline mixer and the water guide pipe, so that the uniform distribution of the back washing medicament in the membrane tank is realized, and the pollutants accumulated in the membrane filaments are effectively removed; and due to the hydraulic recoil action of the clear water/the medicament, pollutants on the outer surface of the membrane wire are quickly 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 back flushing is realized, pollutants on the surface of the membrane wire can be effectively removed, and flux is effectively recovered;
the continuous and stable operation of the system is realized by alternately carrying out online maintenance cleaning and online recovery cleaning.
Drawings
FIG. 1 is a schematic structural diagram of an on-line backwashing device of a membrane concentration reactor according to an embodiment of the present invention;
fig. 2 is a graph of time versus transmembrane pressure differential in an embodiment of the invention.
Detailed Description
The structure and operation of the present invention will be described in detail with reference to the accompanying drawings and examples.
In order to solve the problem that the membrane that membrane concentration height leads to pollutes seriously, the clean frequency of off-line is high, unable independent continuous operation, the utility model provides an online back washing unit of membrane concentration reactor can realize the effective recovery of membrane flux in large-scale membrane concentration reactor pilot scale equipment, realizes reactor continuous steady operation, avoids the high frequency off-line to wash.
The utility model provides an online backwashing device of a membrane concentration reactor, which comprises different backwashing mode trigger mechanisms, devices and methods. The back washing is on-line, each part of the back washing system is connected with the automatic control system, the automatic control system automatically operates according to the operation condition of the equipment and the program set period, and the back washing system is divided into maintenance washing and recovery washing according to the dosing concentration and the back washing time.
The maintenance cleaning is controlled by the transmembrane pressure difference value and the running time in a combined manner, the recovery cleaning is controlled by the transmembrane pressure difference value and the growth rate in a combined manner, the transmembrane pressure difference set value is recommended to be 35kPa, and the growth rate set value is 1.5 kPa/h. When the continuous running time of the equipment reaches 3d, no matter the transmembrane pressure difference is high or low, the maintainability cleaning is triggered; when the transmembrane pressure difference is more than a set value and is continuously more than 5min, triggering maintenance cleaning no matter the continuous operation time is long; and triggering the recovery cleaning when the transmembrane pressure difference value is larger than the set value for more than 5min continuously and the growth rate exceeds the set value.
As shown in fig. 1, in the embodiment of the on-line back washing device for a membrane concentration reactor of the present invention, the back washing device specifically includes a back washing water tank 9, a back washing pump 8, a dosing pump 6, a chemical agent tank 7, a pipeline mixer 4, a water conduit 11, and an aerator 3, each component is connected to an automatic control system 10 for automatic operation, each step can be automatically operated according to a set program, and a water outlet provided at the bottom of the back washing water tank 9 is communicated with a water inlet of the back washing pump 8; one end of the chemical feeding pump 6 is connected to the chemical agent box 7, and the other end of the chemical feeding pump and the water outlet of the back washing pump 8 are connected to the pipeline mixer 4; 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 filaments in the membrane concentration reactor 1 and is used for injecting clear water/medicament mixed liquid into the membrane filaments; one end of the air inlet electromagnetic valve 12 is connected with an aerator 3, and the other end is connected with the bottom of the membrane concentration reactor 1 through an air duct;
a back flushing water tank 9 and a back flushing pump 8 which are matched with the designed 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 backwashing water tank 9 and is communicated with a water inlet of a backwashing pump 8, and the flow range of the backwashing pump 8 is 5-15m 3 H; when the flow is large, the backflushing flow speed is large, the generated hydraulic action is strong, and the stripping of pollutants from the surface of the membrane wire is facilitated.
When the maintainability cleaning is triggered, the backwashing agent is an alkali cleaning agent, the concentration of the backwashing agent is 1000-5000ppm, and the backwashing process is an alkali cleaning process; when the recovery cleaning is triggered in the step 1, the backwashing agent is an acid cleaning agent and then an alkali cleaning agent, wherein the concentration of the acid cleaning agent is 3000ppm and the concentration of the alkali cleaning agent is 1000 ppm and 5000 ppm.
The alkaline cleaning 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 on-line backwashing device of the membrane concentration reactor is suitable for only acid washing, only alkali washing or acid washing and alkali 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 clear water/medicament mixed liquid is injected into the membrane wire, a chemical medicament with a certain concentration is provided, and meanwhile, hydraulic recoil is carried out, and effective separation of pollutants and the membrane wire is realized;
further, the aerator is communicated with the bottom of the membrane concentration reactor 1, lateral shearing force is provided outside the membrane filaments under the action of gas surface scouring, and effective stripping of pollutants is further realized under the action of coupling water and air.
A membrane concentration reactor backwashing method comprises the following steps:
step 1: when the transmembrane pressure difference of the membrane concentration reactor continuously exceeds the set value for 5min, the automatic control system 10 stops the water production step and stops aeration at the same time, and the reference value of the transmembrane pressure difference is 35 kPa;
and 2, step: a part of concentrated solution in the reactor is discharged through the sludge discharge device 5, so that the liquid level height is reduced, the phenomenon that the backwashing water overflows after being added into the membrane pool is prevented, and meanwhile, the concentration of the concentrated solution in the membrane pool can be reduced, and the recovery of flux is facilitated;
and step 3: clear water is injected into a backwashing water tank 9, a backwashing agent is configured in a chemical agent tank 7, a backwashing pump 8 and a dosing pump 6 are started at the same time, the clear water and the agent are fully and uniformly mixed through a pipeline mixer 4 and then are injected into membrane filaments of a membrane concentration reactor 1 through a water guide pipe 11 in a backwashing mode, and the addition concentration of the backwashing agent is adjusted according to the flow rate of the dosing pump;
and 4, step 4: stopping the back washing pump 8 and the dosing pump 6 to fully soak the clear water/medicament mixed solution and the membrane component in the membrane reactor, wherein the soaking time is determined by the back washing type, and when the maintenance cleaning is carried out, the soaking time is 30-45 min; when the recovery cleaning is carried out, the soaking time is 6-10 h;
and 5: opening the aerator 3 and the air inlet electromagnetic valve 12 after a certain time, aerating the membrane filaments in the membrane concentration reactor 1 through the air duct 11, thereby providing shearing force for the outer surfaces of the membrane filaments to remove pollutants on the surfaces of the membrane filaments, wherein the aeration time is different according to the cleaning type, and when maintenance cleaning is carried out, the aeration time is 30-45 min; when the recovery cleaning is carried out, the aeration time is 6-10 h;
step 6: and (3) repeating the steps, repeating the steps 3-5 when triggering the recovery cleaning, carrying out acid cleaning and then alkali cleaning, and when triggering the maintenance cleaning, directly recovering the equipment after finishing the step 5.
The utility model discloses a membrane concentration reactor online backwashing device, which is implemented by taking the online backwashing of a chemical-biological reinforced membrane concentration reactor as an example. The scale of the treatment was 500m 3 A bio-chemically enhanced membrane concentration reactor of effective working volume about 20m 3 The device is used for continuously treating urban domestic sewage, when transmembrane pressure difference continuously exceeds a set value of 35kPa for 5min, maintainable cleaning is triggered, at the moment, water production and aeration are stopped, the sludge discharge system 5 is started, the effective liquid level height is reduced to 2.00m from 2.54m, clean water is injected into a backwashing water tank 9, the chemical feeding pump 6 and the backwashing pump 8 are opened, meanwhile, a matched valve on a pipeline is opened, the clean water and chemicals are uniformly mixed through the pipeline mixer 4 to form sodium hypochlorite solution with the concentration of 2000ppm, the sodium hypochlorite solution is injected into membrane filaments through the water guide pipe 11 at the tops of the membrane filaments, the water flow direction is radial flow, the aeration is stopped, after 30min soaking, the aeration is continued, the operation is recovered after 30min aeration, and the change of the operation pressure is observed. As shown in FIG. 2, before cleaning, the pressure reached a set value of 35kPa, the transmembrane pressure difference after backwashing was significantly reduced, and was kept stable for a certain operating time.
When the operation of the biological-chemical reinforced membrane concentration reactor exceeds half a year, the membrane flux is not obviously reduced through the alternation of maintainability cleaning and restorability cleaning, and the back flush can effectively restore the flux, so that the utility model discloses the independence and the stability of the operation of the biological-chemical reinforced membrane concentration reactor are greatly improved, and the membrane pollution is effectively alleviated.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The utility model provides an online back flush unit of membrane concentration reactor which characterized in that: the automatic chemical dosing device comprises an aerator (3), a pipeline mixer (4), a dosing pump (6), a chemical agent box (7), a backwashing pump (8), a backwashing water box (9) and a water guide pipe (11), wherein all the components are connected with an automatic control system (10) so as to facilitate automatic operation, and a water outlet arranged at the bottom of the backwashing water box (9) is communicated with a water inlet of the backwashing pump (8); one end of the chemical feeding pump (6) is connected to the chemical agent box (7), and the other end of the chemical feeding pump and the water outlet of the backwashing pump (8) are connected to the pipeline mixer (4); one end of the aqueduct (11) is connected with the pipeline mixer (4), and the other end is communicated with the top of the membrane filament in the membrane concentration reactor (1) and is used for injecting clear water/medicament mixed liquid into the membrane filament; the online backwashing device of the membrane concentration reactor further comprises an air inlet electromagnetic valve (12), one end of the air inlet electromagnetic valve (12) is connected with an aerator (3), and the other end of the air inlet electromagnetic valve is connected to the bottom of the membrane concentration reactor (1) through an air guide pipe.
2. The on-line back-flushing device of the membrane concentration reactor as claimed in 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 on-line back-flushing device of the membrane concentration reactor as claimed in claim 1, wherein: when the back washing agent arranged in the chemical agent box (7) is an alkali washing agent, the concentration of the back washing agent is 1000-5000ppm, and the alkali washing agent is sodium hypochlorite, potassium hypochlorite or hydrogen peroxide; when the backwashing agent is an acid-washing agent, the concentration is 1000-3000ppm, and the acid-washing agent is citric acid, oxalic acid or oxalic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123427954.5U CN217103214U (en) | 2021-12-31 | 2021-12-31 | Online back flush device of membrane concentration reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123427954.5U CN217103214U (en) | 2021-12-31 | 2021-12-31 | Online back flush device of membrane concentration reactor |
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| Publication Number | Publication Date |
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| CN217103214U true CN217103214U (en) | 2022-08-02 |
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| CN202123427954.5U Active CN217103214U (en) | 2021-12-31 | 2021-12-31 | Online back flush device of membrane concentration reactor |
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