CN112607961A - Split anaerobic membrane distillation bioreactor - Google Patents
Split anaerobic membrane distillation bioreactor Download PDFInfo
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- CN112607961A CN112607961A CN202011368891.8A CN202011368891A CN112607961A CN 112607961 A CN112607961 A CN 112607961A CN 202011368891 A CN202011368891 A CN 202011368891A CN 112607961 A CN112607961 A CN 112607961A
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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
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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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
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/14—NH3-N
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/063—Underpressure, vacuum
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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
- C02F2303/10—Energy recovery
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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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Abstract
The invention relates to the technical field of biological sewage treatment, in particular to a split type anaerobic membrane distillation bioreactor which comprises an anaerobic bioreactor, a bioreactor water inlet pipe, a heat pump, a heating circulating pipe, a reactor circulating water pump, a sludge discharge blow-down pipe, a membrane distillation assembly water inlet pipe, a membrane distillation assembly water return pipe, a membrane distillation assembly water outlet pipe, a membrane distillation circulating water pump, a water storage tank, a condenser, a vacuum pump and a vacuum pump connecting pipe. The invention combines the anaerobic biological treatment technology and the membrane distillation technology, combines the advantages of the anaerobic bioreactor and the membrane distillation, has high activity of mesophilic anaerobic bacteria under high temperature, can degrade a large amount of organic matters, reduces the pollutant load of the membrane distillation section, can generate methane to provide energy for the subsequent membrane distillation, and realizes the complete or partial self-sufficiency of the energy of the whole reactor; by utilizing the excellent separation performance of membrane distillation, the problem of serious membrane pollution of the traditional membrane bioreactor can be solved, and the effluent quality can be improved.
Description
Technical Field
The invention relates to the technical field of biological sewage treatment, in particular to a split anaerobic membrane distillation bioreactor.
Background
With the improvement of the sewage discharge standard, the traditional activated sludge treatment technology cannot meet the discharge requirement, and the membrane bioreactor utilizes the high-efficiency separation effect of the membrane, so that the pollution removal effect is obviously superior to that of the traditional sedimentation tank, and the quality of the process effluent is obviously improved. In addition, the membrane bioreactor technology also has the advantages of low residual sludge yield, small occupied area, no limitation of setting occasions and the like, so that the membrane bioreactor technology is popularized and applied. However, the conventional membrane bioreactor generally adopts a microfiltration membrane and an ultrafiltration membrane, and has two technical disadvantages: the membrane pollution is serious, and the process energy consumption is greatly increased; soluble salts and micromolecular organic matters still exist in the effluent.
The membrane distillation technology uses a hydrophobic microporous membrane as a separation medium and uses steam pressure difference as a driving force, so that theoretically, non-volatile components in a solution can be completely intercepted, and for a solution with only water as a volatile component, only water can pass through a membrane, so that high-quality water can be produced by membrane distillation. The membrane distillation is adopted to replace low-pressure membrane separation technologies such as microfiltration and ultrafiltration, so that the soluble pollutants in water can be completely removed, and meanwhile, the membrane distillation is driven by temperature difference and is not limited by concentration polarization, and high-concentration pollution can be treated. According to the principle of membrane distillation, certain temperature difference exists at two sides of a membrane distillation membrane during operation, so that solution at the feed liquid side of the membrane distillation needs to be heated and set for circulation to keep certain high temperature, and a condensing device needs to be arranged at the permeation side of the membrane to condense water vapor permeating the membrane to obtain produced water. However, membrane distillation is inherently energy inefficient.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to: the split type anaerobic membrane distillation bioreactor is provided, combines the advantages of the anaerobic bioreactor and the membrane distillation, and overcomes the defects of low effluent quality and low membrane distillation efficiency of the traditional membrane bioreactor.
In order to achieve the purpose, the invention adopts the following technical scheme:
a split anaerobic membrane distillation bioreactor comprises an anaerobic bioreactor, a membrane distillation component, a water storage tank and a vacuum pump; the lateral wall bottom of anaerobism bioreactor is equipped with the bioreactor inlet tube, be equipped with the heat pump on the bioreactor inlet tube, the lateral wall top of anaerobism bioreactor is equipped with the heating and circulating pipe, the heating and circulating pipe is connected on the bioreactor inlet tube between heat pump and anaerobism bioreactor, be equipped with reactor circulating water pump on the heating and circulating pipe, the top of membrane distillation subassembly is equipped with membrane distillation subassembly inlet tube, membrane distillation subassembly inlet tube is connected with the anaerobism bioreactor, be equipped with membrane distillation circulating water pump on the membrane distillation subassembly inlet tube, the bottom of membrane distillation subassembly is equipped with membrane distillation subassembly wet return, the membrane distillation subassembly wet return is connected with the row's mud blow-down pipe of anaerobism bioreactor bottom, the lateral wall of membrane distillation subassembly is equipped with the membrane distillation subassembly outlet pipe, the membrane distillation subassembly outlet pipe is connected with the water storage tank, be equipped with the condenser on the membrane distillation subassembly outlet pipe.
Further, the anaerobic bioreactor is a CSTR reactor.
Further, a stirrer is arranged in the CSTR reactor, and a stirrer motor is arranged on the stirrer.
Furthermore, a methane collecting pipe is arranged at the top of the CSTR reactor.
Further, the membrane distillation membrane in the membrane distillation assembly is a hollow fiber hydrophobic microporous membrane.
Further, the contact angle of the hollow fiber hydrophobic microporous membrane is not less than 120 degrees.
Furthermore, the aperture of the hollow fiber hydrophobic microporous membrane is 0.1-1 μm.
Furthermore, two ports are arranged on the sludge discharge blow-down pipe, and the water return pipe of the membrane distillation assembly is connected with one of the ports of the sludge discharge blow-down pipe.
Further, the condenser is a serpentine tube condenser.
Further, the vacuum pump generates a vacuum degree of less than 80 kPa.
In summary, the present invention has the following advantages:
according to the invention, the anaerobic biological treatment technology and the membrane distillation technology are combined to construct the split type anaerobic membrane distillation bioreactor, and the advantages of the anaerobic bioreactor and the membrane distillation are combined, so that on one hand, mesophilic anaerobes have high activity under a high temperature condition, can degrade a large amount of organic matters, reduce the pollutant load of a membrane distillation section, and can generate methane, provide energy for subsequent membrane distillation, and realize complete or partial self-sufficiency of the energy of the whole reactor; on the other hand, by utilizing the separation principle that the membrane distillation technology is driven by the steam pressure difference and the excellent separation performance, the problem of serious membrane pollution caused by the membrane separation process that the traditional membrane bioreactor is driven by the pressure can be solved, and the effluent quality of the anaerobic bioreactor can be improved. The split anaerobic membrane distillation bioreactor realizes the functions of pollutant degradation, water quality improvement and energy recovery, has better operation and treatment effects, and has obvious research significance and engineering value.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a graph showing the efficiency of the present invention in treating a digested biogas slurry in example one.
FIG. 3 is a graph showing flux decay during biogas slurry treatment according to the first embodiment of the present invention.
FIG. 4 is a graph showing the change of conductivity of the water producing side in the process of treating the digested biogas slurry according to the first embodiment of the present invention.
Wherein: 1 is CSTR reactor, 2 is the agitator motor, 3 is the agitator, 4 is the membrane distillation subassembly, 5 is hollow fiber hydrophobic microporous membrane, 6 is reactor circulating water pump, 7 is the membrane distillation circulating water pump, 8 is the vacuum pump, 9 is the heat pump, 10 is the condenser, 11 is the bioreactor inlet tube, 12 is the heating cycle pipe, 13 is the membrane distillation subassembly inlet tube, 14 is the membrane distillation subassembly wet return, 15 is the membrane distillation subassembly outlet pipe, 16 is the vacuum pump connecting pipe, 17 is the methane collecting pipe, 18 is row mud blow-down pipe, 19 is the water storage tank.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and detailed description.
As shown in fig. 1, a split anaerobic membrane distillation bioreactor comprises an anaerobic bioreactor, a membrane distillation assembly, a water storage tank and a vacuum pump; the lateral wall bottom of anaerobism bioreactor is equipped with the bioreactor inlet tube, be equipped with the heat pump on the bioreactor inlet tube, the lateral wall top of anaerobism bioreactor is equipped with the heating and circulating pipe, the heating and circulating pipe is connected on the bioreactor inlet tube between heat pump and anaerobism bioreactor, be equipped with reactor circulating water pump on the heating and circulating pipe, the top of membrane distillation subassembly is equipped with membrane distillation subassembly inlet tube, membrane distillation subassembly inlet tube is connected with the anaerobism bioreactor, be equipped with membrane distillation circulating water pump on the membrane distillation subassembly inlet tube, the bottom of membrane distillation subassembly is equipped with membrane distillation subassembly wet return, the membrane distillation subassembly wet return is connected with the row's mud blow-down pipe of anaerobism bioreactor bottom, the lateral wall of membrane distillation subassembly is equipped with the membrane distillation subassembly outlet pipe, the membrane distillation subassembly outlet pipe is connected with the water storage tank, be equipped with the condenser on the membrane distillation subassembly outlet pipe.
As shown in fig. 1, in the present embodiment, the anaerobic bioreactor is a CSTR reactor (a continuous stirred complete mixing reactor), a stirrer is provided in the CSTR reactor, a stirrer motor is provided on the stirrer, the concentration of the mixed liquid sludge in the CSTR reactor is 6000 to 8000mg/L, and the retention time of the sludge in the CSTR reactor is 30 to 40 days. The top of the CSTR reactor is provided with a methane collecting pipe, and the collected methane can provide energy for the subsequent membrane distillation, so that the energy of the anaerobic membrane distillation bioreactor is partially self-sufficient.
As shown in figure 1, a membrane distillation membrane in the membrane distillation assembly is a hollow fiber hydrophobic microporous membrane, the contact angle of the hollow fiber hydrophobic microporous membrane is not less than 120 degrees, and the aperture of the hollow fiber hydrophobic microporous membrane is 0.1-1 μm. The water inlet flow rate of the membrane distillation assembly is 0.01-0.1 m/s.
The heat source of the heat pump mainly uses industrial waste heat, solar energy and geothermal energy, and is assisted by electric heating. The water temperature of the mixed liquid in the CSTR reactor is maintained at 40-60 ℃ by heating of a heat pump.
The condenser is a coiled pipe condenser, and steam condensate on the permeation side of the membrane distillation assembly is condensed into 10-20 ℃ produced water through condensation of the condenser.
As shown in figure 1, two ports are arranged on the sludge discharge blow-down pipe, the water return pipe of the membrane distillation assembly is connected with one port of the sludge discharge blow-down pipe, and sludge in the CSTR reactor is discharged from the other port of the sludge discharge blow-down pipe.
The vacuum degree generated by the vacuum pump is less than 80 kPa.
As shown in FIG. 1, in the use of the present invention, wastewater (raw water) to be treated enters from a water inlet pipe of a bioreactor, is heated by a heat pump, is mixed with treated water flowing out from the upper part of a CSTR reactor and returning through a heating circulation pipe, and then enters the CSTR reactor from the lower part of the CSTR reactor; after being treated by the CSTR reactor, the effluent of the CSTR reactor enters the membrane distillation component through the water inlet pipe of the membrane distillation component, the membrane distillation component is filled with a hollow fiber hydrophobic microporous membrane, the vacuum pump enables the permeation side of the membrane distillation component to form a vacuum degree smaller than 80kPa, so that water vapor passes through the hollow fiber hydrophobic microporous membrane to enter the permeation side of the membrane distillation component, the water vapor is liquefied into produced water under the condensation action of the condenser, the produced water flows into the water storage tank through the water outlet pipe of the membrane distillation component, the concentrated solution in the membrane distillation component enters the sludge discharge blow-down pipe through the water return pipe of the membrane distillation component and returns to the CSTR reactor through the sludge discharge blow-down pipe, the sludge in the CSTR reactor can be discharged through the sludge discharge blow-down pipe, and the methane generated in the reaction process of the CSTR reactor enters the methane collecting pipe and can be used for subsequent membrane distillation.
Example one
The method is used for treating the digestion biogas slurry, wherein the oxygen Consumption (COD) of the digestion biogas slurry is 626-637 mg/L, the conductivity is 4.22-4.30 mS/cm, and the ammonia nitrogen is 198-222 mg/L. After being heated by a heat pump, the temperature of the solution in the CSTR reactor is maintained at 40-60 ℃. The test results are shown in fig. 2, 3 and 4.
As can be seen from FIG. 2, the removal rate of COD in the digested biogas slurry was maintained at 99% or more, and did not change significantly with the increase in the amount of filtered water. When the filtered water volume is 80mL and 160mL, the removal rate of ammonia nitrogen is 91% and 92% respectively, when the filtered water volume is 240mL and 320mL, the removal rate of ammonia nitrogen is 77% and 79% respectively, and when the filtered water volume is more than 240mL, the removal rate of ammonia nitrogen is reduced.
As can be seen from fig. 3, under the condition of pH 7, when the amount of filtrate was 0 to 160mL, the specific flux of the membrane decreased slowly, and when the amount of filtrate exceeded 160mL, the specific flux decreased at a high rate, and when the amount of filtrate reached 320mL, the specific flux was 0.8.
As can be seen from FIG. 4, under the condition of pH 7, the conductivity of the membrane distilled water is increased from 0.9 mu S/cm to 699 mu S/cm along with the increase of the amount of filtered water, and the overall effluent conductivity is lower than that of the raw water by 4.22-4.30 mS/cm. The main reason for the increase in conductivity is that ammonia is volatilized into the water producing side and no significant membrane wetting occurs.
According to the experimental result, the COD removal rate is maintained to be more than 99%, the membrane flux is reduced to about 20% of the initial flux, the conductivity of the effluent is far lower than that of the raw water, and the overall treatment effect is good.
In general, the anaerobic biological treatment technology and the membrane distillation technology are combined to construct the split anaerobic membrane distillation bioreactor, and the advantages of the anaerobic bioreactor and the membrane distillation are combined, so that on one hand, mesophilic anaerobic bacteria have high activity under the high-temperature condition, can degrade a large amount of organic matters, reduce the pollutant load of a membrane distillation section, can generate methane, can provide energy for subsequent membrane distillation, and realize complete or partial self-sufficiency of the energy of the whole reactor; on the other hand, by utilizing the separation principle that the membrane distillation technology is driven by the steam pressure difference and the excellent separation performance, the problem of serious membrane pollution caused by the membrane separation process that the traditional membrane bioreactor is driven by the pressure can be solved, and the effluent quality of the anaerobic bioreactor can be improved. The split anaerobic membrane distillation bioreactor realizes the functions of pollutant degradation, water quality improvement and energy recovery, has better operation and treatment effects, and has obvious research significance and engineering value.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A split type anaerobic membrane distillation bioreactor is characterized in that: comprises an anaerobic bioreactor, a membrane distillation component, a water storage tank and a vacuum pump; the lateral wall bottom of anaerobism bioreactor is equipped with the bioreactor inlet tube, be equipped with the heat pump on the bioreactor inlet tube, the lateral wall top of anaerobism bioreactor is equipped with the heating and circulating pipe, the heating and circulating pipe is connected on the bioreactor inlet tube between heat pump and anaerobism bioreactor, be equipped with reactor circulating water pump on the heating and circulating pipe, the top of membrane distillation subassembly is equipped with membrane distillation subassembly inlet tube, membrane distillation subassembly inlet tube is connected with the anaerobism bioreactor, be equipped with membrane distillation circulating water pump on the membrane distillation subassembly inlet tube, the bottom of membrane distillation subassembly is equipped with membrane distillation subassembly wet return, the membrane distillation subassembly wet return is connected with the row's mud blow-down pipe of anaerobism bioreactor bottom, the lateral wall of membrane distillation subassembly is equipped with the membrane distillation subassembly outlet pipe, the membrane distillation subassembly outlet pipe is connected with the water storage tank, be equipped with the condenser on the membrane distillation subassembly outlet pipe.
2. The split anaerobic membrane distillation bioreactor according to claim 1, wherein: the anaerobic bioreactor is a CSTR reactor.
3. The split anaerobic membrane distillation bioreactor according to claim 2, wherein: a stirrer is arranged in the CSTR reactor, and a stirrer motor is arranged on the stirrer.
4. The split anaerobic membrane distillation bioreactor according to claim 2, wherein: the top of the CSTR reactor is provided with a methane collecting pipe.
5. The split anaerobic membrane distillation bioreactor according to claim 1, wherein: the membrane distillation membrane in the membrane distillation assembly is a hollow fiber hydrophobic microporous membrane.
6. The split anaerobic membrane distillation bioreactor according to claim 5, wherein: the contact angle of the hollow fiber hydrophobic microporous membrane is not less than 120 degrees.
7. The split anaerobic membrane distillation bioreactor according to claim 5, wherein: the aperture of the hollow fiber hydrophobic microporous membrane is 0.1-1 mu m.
8. The split anaerobic membrane distillation bioreactor according to claim 1, wherein: and two ports are arranged on the sludge discharge blow-down pipe, and the water return pipe of the membrane distillation assembly is connected with one of the ports of the sludge discharge blow-down pipe.
9. The split anaerobic membrane distillation bioreactor according to claim 1, wherein: the condenser is a coiled condenser.
10. The split anaerobic membrane distillation bioreactor according to claim 1, wherein: the vacuum degree generated by the vacuum pump is less than 80 kPa.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113480098A (en) * | 2021-07-21 | 2021-10-08 | 扬州大学 | Separated type MAP-anaerobic membrane distillation biological reaction mariculture wastewater treatment system |
| WO2024189412A1 (en) * | 2023-03-16 | 2024-09-19 | Kuwait Institute For Scientific Research | Hybrid solar still and anaerobic membrane bioreactor for wastewater treatment |
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| WO2024189412A1 (en) * | 2023-03-16 | 2024-09-19 | Kuwait Institute For Scientific Research | Hybrid solar still and anaerobic membrane bioreactor for wastewater treatment |
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Application publication date: 20210406 |