CN211712738U - Water treatment system based on split type anaerobic membrane bioreactor - Google Patents
Water treatment system based on split type anaerobic membrane bioreactor Download PDFInfo
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Abstract
A water treatment system based on a split type anaerobic membrane bioreactor comprises an anaerobic reactor, a water treatment tank and a water treatment tank, wherein the anaerobic reactor is used for anaerobic fermentation and methane production; the membrane pool is internally provided with a membrane component and used for discharging the treated wastewater; and the gas circulating device is used for forming methane circulation in the anaerobic reactor and the membrane pool. The utility model can adapt to high concentration organic wastewater, and can realize the advantages of stable process operation system, short-range effluent quality reaching standards and the like; intercepting high molecular weight pollutants in the sludge mixed liquid through a membrane separation technology, improving the concentration of sludge in the reactor and stabilizing the quality of effluent water; the treatment device has high mixing degree and strong impact load resistance, and particularly has good adaptability to easily acidified organic wastewater.
Description
Technical Field
The utility model belongs to the technical field of water treatment and new forms of energy, in particular to a water treatment system based on split type anaerobic membrane bioreactor.
Background
With the push of garbage classification, the discharge of high-concentration organic wastewater represented by kitchen garbage and fresh leachate thereof is at a high level, and anaerobic treatment can synchronously recover energy and water resources, so that field equipment development is necessary. Taking the kitchen garbage percolate as an example, the kitchen garbage percolate is rich in carbohydrate and protein, and the Chemical Oxygen Demand (COD) can reach 40-50 g.L-1The solid holdup TS can reach 3-5%, and the total phosphorus and the total nitrogen are respectively 70-90 mg.L-1And 1500--1Has better biodegradability and is suitable for anaerobic treatment.
Kitchen waste leachate waste water is easy to hydrolyze and acidify, and Volatile Fatty Acids (VFAs) generated in the operation process are easy to inhibit anaerobic microorganisms to a certain extent if being not quickly methanated and removed, so that the acidification and collapse of the reactor are caused. Meanwhile, the kitchen waste leachate wastewater is easy to cause sludge floating and loss in the anaerobic process, and for example, Long Chain Fatty Acids (LCFAs) which are hydrolysate thereof have anaerobic inhibition effect and hydrophobicity, sludge floating and loss can be caused. Therefore, the traditional anaerobic process for treating the kitchen waste leachate has the defects of limited COD removal rate, sludge loss and the like.
The split type anaerobic reactor is coupled with the membrane separation to form the external anaerobic membrane bioreactor, so that the solid-liquid separation can be effectively strengthened, and the sludge loss is reduced; meanwhile, the method is favorable for keeping higher volume load and reducing the acidification risk of the system. An AnMBR (anaerobic membrane bioreactor) is a novel wastewater treatment process combining an anaerobic biological treatment unit and a membrane separation technology, not only retains partial advantages of the anaerobic technology, but also can completely intercept microorganisms due to the introduction of a membrane module, thereby realizing the decoupling of SRT (sludge retention time) and HRT (hydraulic retention time). Therefore, the anaerobic membrane bioreactor has the advantages of high pollutant removal rate, stable treatment effect and the like, has good application prospect in the aspect of high-concentration and complex organic wastewater treatment, and can obtain good effluent quality due to the complete interception of suspended matters by the membrane and higher treatment efficiency of the membrane.
SUMMERY OF THE UTILITY MODEL
In view of the above, one of the main objects of the present invention is to provide a water treatment system based on a split type anaerobic membrane bioreactor, so as to at least partially solve at least one of the above technical problems.
In order to realize the purpose, the utility model provides a water treatment system based on split type anaerobic membrane bioreactor, include:
the anaerobic reactor is used for anaerobic fermentation and methane generation;
the membrane pool is internally provided with a membrane component and used for discharging the treated wastewater; and
and the gas circulating device is used for forming biogas circulation in the anaerobic reactor and the membrane pool.
Based on the technical scheme, the water treatment system based on the split type anaerobic membrane bioreactor of the utility model has at least one of the following advantages compared with the prior art:
1. the treatment device can adapt to high-concentration organic wastewater, and has the advantages of stable process operation system, short-range effluent quality reaching standards and the like;
2. intercepting high molecular weight pollutants in the sludge mixed liquid through a membrane separation technology, improving the concentration of sludge in the reactor and stabilizing the quality of effluent water;
3. the treatment device has high mixing degree and strong impact load resistance, and particularly has good adaptability to easily acidified organic wastewater;
4. the treatment device adopts partial heating, and a certain temperature gradient is formed through gas-liquid upflow circulation, so that energy is saved, different temperature environments can be created in different areas, and different types of microorganisms can achieve higher activity in different areas; the gas production effect is good, and the treatment efficiency is high;
5. by counting in the gas flowmeter, the load of the reactor can be flexibly adjusted and the COD concentration of the discharged water can be flexibly controlled according to the gas production rate, and the operation is flexible;
6. the membrane pollution is controlled through biogas aeration circulation, carbon dioxide mass transfer is enhanced, the inorganic carbon TIC content of sludge mixed liquor is increased, and the acidic organic wastewater is better buffered;
7. the high-concentration organic wastewater treatment device has compact structure, reduces the occupied area of the wastewater treatment device, is convenient to operate, operate and maintain, is easy to realize automatic control, and is suitable for popularization and use;
8. the utility model can be applied to high-concentration organic wastewater, such as agricultural and sideline food processing industry wastewater, fermentation and brewing wastewater, alcohol wastewater and livestock wastewater, and realizes the treatment and discharge reaching the connection pipe standard in one step;
9. the utility model has low energy consumption, high volume load and stable water quality of discharged water;
10. the utility model discloses can improve anaerobism technology COD clearance, reach short flow purpose up to standard, realize that agricultural and sideline food processing industry waste water, fermentation waste water and kitchen waste water reach the takeover standard one step.
Drawings
FIG. 1 is a schematic structural diagram of the split type anaerobic membrane bioreactor of the utility model;
FIG. 2 is a schematic view of the organic wastewater treatment process of the present invention.
Symbolic illustrations in the drawings:
100-a first reaction chamber; 101-a first three-phase separator; 102-a water inlet container; 103-a water inlet pump; 104-temperature control means; 200-a second reaction chamber; 201-a second three-phase separator; 202-a weir; 203-a weir outlet; 204-a second reaction chamber return port; 205-gas collecting channel; 206-biogas outlet; 300-a membrane pool; 301-membrane tank water inlet; 302-membrane pool water outlet; 303-flat membrane; 304-flat membrane water outlet; 305-an aeration port; 306-membrane tank air outlet; 307-a water outlet container; 308-a water outlet pump; 309-pressure gauge; 310-a liquid circulation pump; 400-gas circulation pump; 401-gas buffer bottle; 402-a safety bottle; 403-gas flow meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
An object of the utility model is to provide a high concentration organic waste water's processing apparatus to realize whole processing apparatus's effective stability, the treatment cost is low, goes out the advantage of water stabilization of quality of water, realizes the utilization of resources of the high concentration organic matter in the waste water simultaneously.
The utility model discloses a water treatment system, include:
the anaerobic reactor is used for anaerobic fermentation and methane generation;
the membrane pool is internally provided with a membrane component and used for discharging the treated wastewater; and
and the gas circulating device is used for forming biogas circulation in the anaerobic reactor and the membrane pool.
In some embodiments of the present invention, the gas circulation device comprises:
the gas collection unit is used for separating and collecting methane generated by the anaerobic reactor;
the gas circulation unit is used for introducing the methane in the gas collection unit into the membrane tank for aeration; and
and the gas backflow unit is used for refluxing the methane in the membrane tank into the gas collection unit.
In some embodiments of the present invention, the gas collecting unit comprises a gas collecting hood;
in some embodiments of the present invention, the gas circulation unit comprises a gas circulation pump and a membrane tank aeration port disposed on the membrane tank;
in some embodiments of the present invention, a gas buffer bottle is disposed between the gas circulation pump and the gas collection unit;
in some embodiments of the present invention, the gas reflux unit includes a membrane pool gas vent, and the membrane pool gas vent communicates with the gas collecting channel.
In some embodiments of the present invention, the membrane tank is provided with a membrane tank water inlet for guiding the liquid in the anaerobic reactor into the membrane tank;
in some embodiments of the present invention, the membrane tank is provided with a membrane tank water outlet for returning the liquid in the membrane tank to the anaerobic reactor.
In some embodiments of the present invention, the membrane module comprises a flat sheet membrane;
in some embodiments of the present invention, the flat membrane is provided with a flat membrane water outlet for outputting separated water.
In some embodiments of the present invention, a first reaction chamber and a second reaction chamber are disposed in the anaerobic reactor.
In some embodiments of the present invention, a first three-phase separator is disposed within the first reaction chamber;
in some embodiments of the present invention, a second three-phase separator is disposed in the second reaction chamber.
In some embodiments of the present invention, the first three-phase separator is a double-layer inverted triangle structure;
in some embodiments of the present invention, the second three-phase separator is a single-layer inverted cone structure; in some embodiments of the present invention, a throat-shaped hoop is provided at the lower part of the cone;
in some embodiments of the present invention, the exhaust pipe of the first three-phase separator extends into the interior of the inverted cone;
in some embodiments of the present invention, the second reaction chamber is provided with an overflow weir and an outlet of the overflow weir, and the liquid in the second reaction chamber flows into the membrane pool through the outlet of the overflow weir.
In some embodiments of the present invention, the anaerobic reactor further comprises an external circulation unit for refluxing the liquid in the membrane tank to the first reaction chamber;
in some embodiments of the present invention, the external circulation unit comprises an external circulation line;
in some embodiments of the present invention, the anaerobic reactor is cylindrical and has an aspect ratio of 8 to 20.
In some embodiments of the present invention, the water treatment system further comprises a temperature control device for regulating the anaerobic reactor;
in some embodiments of the present invention, the water treatment system further comprises a water inlet device, the water inlet device being connected to the anaerobic reactor;
in some embodiments of the present invention, the water treatment system further comprises a drainage device, the drainage device being connected to the membrane tank;
in some embodiments of the present invention, the drainage device comprises a water outlet container and a water outlet pump;
in some embodiments of the present invention, the water treatment system further comprises an exhaust device, the exhaust device being connected to the gas circulation device;
in some embodiments of the invention, the exhaust device comprises a safety bottle and a gas flow meter.
The utility model also discloses a water treatment method adopts as above water treatment system, include:
inoculating anaerobic sludge in an anaerobic reactor;
introducing wastewater to be treated into an anaerobic reactor for reaction;
circulating biogas generated in the reaction of the anaerobic reactor between the membrane tank and the anaerobic reactor through a gas circulating device and collecting redundant gas;
and circulating the liquid generated in the anaerobic reactor between the membrane pool and the anaerobic reactor and collecting the treated water to finish the water treatment.
In an exemplary embodiment, the split type anaerobic membrane biological reaction treatment system of the present invention comprises an anaerobic reactor, an external membrane tank 300, a forced circulation system and a temperature control device 104.
The anaerobic reactor is an internal circulation split type anaerobic reactor and comprises a first reaction chamber 100 and a second reaction chamber 200, and the anaerobic reactor is connected with a membrane pool 300 through a gas circulation device and a liquid circulation device.
The bottom of the first reaction chamber 100 is provided with a water inlet pipe which is connected with a water inlet container 102, and the upper part of the first reaction chamber 100 is provided with a first three-phase separator 101;
the first three-phase separator 101 is arranged at the lower part of the second reaction chamber 200, the second three-phase separator 201 is arranged at the upper part of the second reaction chamber 200, and the bottom of the second reaction chamber is provided with a return port 204;
the first three-phase separator 101 is connected with a gas-water separation pipe through a gas collecting tank, and the second three-phase separator is connected with a top gas-water separator through a gas-water collecting pipe;
the upper part of the second reaction chamber 300 is provided with an overflow weir 202 and an overflow weir outlet 203, the upper part of the overflow weir 202 is provided with a gas collecting hood 205, the overflow weir outlet 203 is connected with a membrane tank water inlet 301, and a membrane tank water outlet 302 is connected with a second reactor bottom return port 204. The top of the gas-water separator is provided with a biogas outlet 206, and the biogas outlet 206 is connected with an aeration pipe 305 of a membrane component, namely a flat membrane 303, through a gas circulating pump 400. The reactor and the membrane tank 300 are subjected to aeration flushing on the membrane tank 300 through a gas circulating pump 400, part of gas-liquid mixture is pushed to form external circulation between the reactor and the membrane tank 300, and meanwhile, a controllable mixed liquid forced circulation is formed between a membrane tank water outlet 302 and a second reaction chamber return opening 204 through a liquid circulating pump 310.
The first three-phase separator 101 is a double-layer inverted triangle structure, and the top of the first three-phase separator is provided with a gas collecting tank for collecting gas in the first reaction chamber 100 and connecting the gas collecting tank with an exhaust pipe to be introduced into the second gas-water separator 201.
Wherein, second three-phase separator 201 is single-deck inverted cone structure, and the circular cone lower part is equipped with larynx form hoop, realizes gas-water separation, and first three-phase separator 101 blast pipe stretches into inside the inverted cone for the gas of first reaction chamber 100 and second reaction chamber 200 gets into top gas-water separator after mixing.
Wherein, the membrane component adopts methane circulating aeration to control membrane pollution.
Wherein, the water outlet pipe of the membrane pool is provided with a regulating valve for controlling the flow.
The split type anaerobic membrane bioreactor is cylindrical, and the height-diameter ratio is 8-20.
Wherein the temperature control device 104 only controls the temperature of the first reaction chamber 100 of the split anaerobic reactor.
Wherein, the water inlet of the split anaerobic reactor is positioned at the bottom of the reactor, the mixed liquor flows out from an overflow weir at the top of the split anaerobic reactor, flows into the membrane tank 300 through the liquid circulating pump 310, and sludge and partial pollutants are intercepted by the flat membrane 303 and are left in the membrane tank to strengthen biodegradation; the membrane effluent is pumped and discharged by an effluent pump 308, and a pressure gauge 309 is arranged on a membrane effluent pipeline.
After the mixed liquid in the reactor enters the membrane pool 300, a part of the mixed liquid passes through a membrane pool air outlet 306 at the top of the membrane pool 300, is pushed to flow by methane and returns to the top of the split type anaerobic reactor together, and then flows into the bottom of the first reaction chamber 100 through an external circulating pipe of the split type anaerobic reactor to carry out a second reaction, so that the circulation of the first reaction chamber is formed; and a part of mixed liquor flows back to the bottom of the second reaction chamber 200 of the split anaerobic reactor through a membrane pool water outlet 302 at the lower part of a membrane pool air outlet 306 to form circulation.
Wherein, the internal circulation amount of the organic wastewater is distributed and controlled by adjusting the biogas circulation aeration amount or the water outlet flow of the membrane tank.
Wherein the internal circulation amount of the organic wastewater is supplemented by forced circulation driven by a circulating pump.
Wherein, the internal circulation amount of the organic wastewater is controlled by adjusting the circulating aeration amount of the methane or the return flow of the water outlet of the membrane tank. The membrane module is cleaned by controlling the circulating aeration quantity of the methane.
The utility model provides a split type anaerobic reactor, the method flow of handling organic waste water is:
A) anaerobic sludge is inoculated in the first reaction chamber 100 and the second reaction chamber 200;
B) the organic wastewater is conveyed to a first reaction chamber 100 through a water inlet pipe, sequentially passes through a first three-phase separator 101, a second reaction chamber 200, a second three-phase separator 201 and a top gas-water separator, enters a membrane pool 300, and then respectively flows back to the top of the reactor and the bottom of the second reaction chamber 200 from a membrane pool water outlet 302 and a membrane pool air outlet 306 to form internal circulation, and a mixed solution is separated through a flat membrane 303 in the circulation process to obtain produced water;
C) biogas generated in the first reaction chamber 100 and the second reaction chamber 200 is enriched by the first three-phase separator 101 and the second three-phase separator 201 respectively, enters the safety bottle 402 after passing through the top gas-water separator, and is measured and counted by the gas flowmeter 403;
D) in the biogas generated after the separation of the top gas-water separator, part of the biogas is pressurized and supplied to the flat membrane 303 assembly, and then flows back to the top of the reactor through the gas outlet 306 of the membrane pool to form biogas cyclic aeration.
The technical solution of the present invention is further explained by the following specific embodiments with reference to the attached drawings. It should be noted that the following specific examples are only illustrative, and the scope of the present invention is not limited thereto.
Referring to fig. 1-2, a high-load anaerobic membrane bioreactor for treating high-concentration organic wastewater comprises an internal circulation anaerobic reactor, wherein a first reaction chamber 100 is arranged at the lower part in the internal circulation anaerobic reactor, a second reaction chamber 200 is arranged at the lower part in the internal circulation anaerobic reactor, a first three-phase separator 101 is arranged in the first reaction chamber 100, a second three-phase separator 201 is arranged in the second reaction chamber 200, and a first three-phase separator collecting 101 air pipe extends into a cone of the second three-phase separator 201 and is mixed with gas in the second reaction chamber 200 and discharged from the top. And a throat-shaped hoop is arranged below the second three-phase separator cone and is used for gas-liquid separation.
The mixed liquid flows out through an overflow weir 202 at the top of the second reaction chamber 200 and enters the bottom of a membrane tank 300 through a liquid circulating pump 310, the membrane tank 300 is of a cuboid structure, flat membranes 303 are arranged in the membrane tank, the interval between the flat membranes 303 is 5mm, and a perforated aeration pipe 305 is arranged at the bottom. A part of the mixed liquid flows into the top of the second reaction chamber 200 from a membrane pool air outlet 306 at the top of the membrane pool 300 and then returns to the bottom of the first reaction chamber 100 through an external circulation pipeline, and a part of the mixed liquid enters the bottom of the second reaction chamber 200 from a membrane pool water outlet 302 and forms circulation in the second reaction chamber 200. The amount of water entering the first reaction chamber 100 and the second reaction chamber 200 can be distributed by adjusting the opening of the two return lines, and thus different circulation ratios can be adjusted according to different load conditions.
The biogas is collected and discharged through a safety bottle 402 and a gas flow meter 403. When water is discharged, the water outlet pump 308 is started, membrane discharged water is sucked and discharged out of the reactor through negative pressure, biogas enters the bottom of the membrane pool 300 through the buffer bottle 401 through the gas circulating pump 400, the flat membrane 303 is exposed from the perforated aeration port 305 to be washed, and the biogas returns to the top of the second reaction chamber 200 from the membrane pool gas outlet 306 to be circulated.
The utility model discloses its function is realized to following operation of accessible:
the first step is as follows: the water inlet pump 103 is turned on to feed the organic wastewater to the bottom of the first reaction chamber 100 of the reactor, and the gas circulation pump 400 and the water outlet pump 308 are turned off. After water inflow is finished, the water inlet pump 103 is closed, the liquid circulating pump 310 is opened, the mixed liquid in the reactor flows from the overflow weir outlet 203 to the membrane tank 300 through the liquid circulating pump 301, flows from the membrane tank water outlet 302 to the second reaction chamber 200 and the first reaction chamber 100 of the reactor, and the generated biogas is discharged through the gas flowmeter 403.
The second step is that: after reacting for a certain time, the gas production rate of the reactor is reduced, at the moment, the gas circulating pump 400 is opened, the water outlet pump 308 is simultaneously opened, and the mixed liquid of the reactor is discharged through the flat membrane water outlet 304 in an intermittent water outlet mode.
The third step: and after the water outlet is finished, closing the gas circulating pump 400 and the water outlet pump 308, reducing the liquid level in the reactor at the moment, opening the water inlet pump 103, and repeating the step one.
Examples
The split type anaerobic membrane bioreactor is cylindrical, and the height-diameter ratio is 10-12.
Anaerobic sludge is inoculated according to different sludge concentrations of the first reaction chamber 100 and the second reaction chamber 200. Kitchen waste water pumped in from a water inlet container 102 through a water inlet pump 103 is conveyed to a first reaction chamber 100, then sequentially passes through a first three-phase separator 101 of the first reaction chamber 100, a second reaction chamber 200, a second three-phase separator 201 of the second reaction chamber and a gas-water separator, then enters a membrane pool 300, and then respectively flows back to the top of the reactor and the bottom of the second reaction chamber 200 to form internal circulation. In the whole operation process, the temperature of the split type anaerobic membrane bioreactor is kept at 33-37 ℃, and the sludge concentration of the first reaction chamber is higher than that of the second reaction chamber.
The main measure for relieving the membrane component pollution is biogas cyclic aeration, and the total reflux amount can be regulated and controlled at the same time, so that the internal circulation amount of the first reaction chamber 100 can be flexibly controlled, and high sludge concentration and good mixed mass transfer can be formed in the first reaction chamber 100. Through the high-load anaerobic degradation of the first reaction chamber 100 and the second reaction chamber 200 and the interception coupling of the inner membrane of the membrane pool 300, the methanation rate of COD is improved, and the aim of meeting the standard of effluent COD in one step is fulfilled.
The average COD concentration of the kitchen waste water entering the membrane circulation anaerobic reactor is 42080 +/-3638 mg.L-1The average COD concentration of the effluent of the membrane is 213.3 +/-12.5 mg.L-1The COD removal rate is 99.25 +/-0.27 percent, and the COD organic pollutant removal effect is obvious.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A water treatment system, comprising:
the anaerobic reactor is used for anaerobic fermentation and methane generation;
the membrane pool is internally provided with a membrane component and used for discharging the treated wastewater; and
and the gas circulating device is used for forming biogas circulation in the anaerobic reactor and the membrane pool.
2. The water treatment system of claim 1,
the gas circulation device includes:
the gas collection unit is used for separating and collecting methane generated by the anaerobic reactor;
the gas circulation unit is used for introducing the methane in the gas collection unit into the membrane tank for aeration; and
and the gas backflow unit is used for refluxing the methane in the membrane tank into the gas collection unit.
3. The water treatment system of claim 2,
the gas collecting unit comprises a gas collecting hood;
the gas circulation unit comprises a gas circulation pump and a membrane pool aeration port arranged on the membrane pool;
a gas buffer bottle is arranged between the gas circulating pump and the gas collection unit;
the gas backflow unit comprises a membrane pool exhaust port which is communicated with the gas collecting hood.
4. The water treatment system of claim 1,
the membrane tank is provided with a membrane tank water inlet used for guiding the liquid in the anaerobic reactor into the membrane tank;
and a membrane tank water outlet for refluxing liquid in the membrane tank to the anaerobic reactor is formed in the membrane tank.
5. The water treatment system of claim 1,
the membrane module comprises a flat membrane;
and a flat membrane water outlet is formed in the flat membrane and used for outputting the separated water.
6. The water treatment system of claim 1,
a first reaction chamber and a second reaction chamber are arranged in the anaerobic reactor;
a first three-phase separator is arranged in the first reaction chamber;
and a second three-phase separator is arranged in the second reaction chamber.
7. The water treatment system of claim 6,
the first three-phase separator is of a double-layer inverted triangular structure;
the second three-phase separator is of a single-layer inverted cone structure; the lower part of the cone is provided with a throat-shaped hoop; the exhaust pipe of the first three-phase separator extends into the inverted cone;
and the second reaction chamber is provided with an overflow weir and an overflow weir outlet, and the liquid in the second reaction chamber flows into the membrane pool through the overflow weir outlet.
8. The water treatment system of claim 1,
the anaerobic reactor also comprises an external circulation unit which is used for refluxing the liquid in the membrane pool to the first reaction chamber;
wherein the external circulation unit comprises an external circulation pipeline;
the anaerobic reactor is cylindrical, and the height-diameter ratio of the anaerobic reactor is 8-20.
9. The water treatment system of claim 1,
the water treatment system further comprises a temperature control device for regulating the anaerobic reactor;
the water treatment system also comprises a water inlet device, and the water inlet device is connected with the anaerobic reactor;
the water treatment system also comprises a drainage device, and the drainage device is connected with the membrane pool;
wherein, drainage device includes a water container and a water pump.
10. The water treatment system of claim 1,
the water treatment system also comprises an exhaust device, and the exhaust device is connected with the gas circulation device;
wherein the exhaust device comprises a safety bottle and a gas flowmeter.
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