CN116986721A - Multistage anaerobic system for treating organic wastewater under environment temperature condition - Google Patents
Multistage anaerobic system for treating organic wastewater under environment temperature condition Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 32
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000002253 acid Substances 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 239000012528 membrane Substances 0.000 claims description 16
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 230000014759 maintenance of location Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000005243 fluidization Methods 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 239000010802 sludge Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- -1 biochar Substances 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 239000003575 carbonaceous material Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 229910052595 hematite Inorganic materials 0.000 claims description 3
- 239000011019 hematite Substances 0.000 claims description 3
- 239000012510 hollow fiber Substances 0.000 claims description 3
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
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- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 230000000696 methanogenic effect Effects 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 claims 1
- 244000005700 microbiome Species 0.000 abstract description 16
- 238000012546 transfer Methods 0.000 abstract description 6
- 239000000758 substrate Substances 0.000 abstract description 5
- 230000002503 metabolic effect Effects 0.000 abstract description 2
- 230000027756 respiratory electron transport chain Effects 0.000 abstract description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 239000012071 phase Substances 0.000 description 13
- 239000007789 gas Substances 0.000 description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 238000000855 fermentation Methods 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
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- 238000000034 method Methods 0.000 description 5
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- 239000010842 industrial wastewater Substances 0.000 description 2
- 239000012263 liquid product Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
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- 239000003925 fat Substances 0.000 description 1
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- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
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Classifications
-
- 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
- C02F3/286—Anaerobic digestion processes including two or more steps
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a multistage anaerobic system for treating organic wastewater at an ambient temperature, belonging to the technical field of anaerobic wastewater treatment; comprising a multi-stage anaerobic treatment system comprising: a primary reactor and a secondary reactor; the first-stage reactor is an integrated anaerobic two-phase reactor and comprises a first-stage tank body, an acid production area, a methane production area and a three-phase separator; the first-stage tank body is a hollow column body; the top of the primary tank body is provided with a cover body. According to the invention, the acid-producing area of the primary reactor firstly adopts a down-flow water inlet mode to feed water, and then enters the methane-producing area in an up-flow mode through the water distributor, so that the efficiency of mass transfer between a substrate and microorganisms is improved; according to the multistage anaerobic system for treating organic wastewater at the ambient temperature, disclosed by the invention, the conductive medium material added in the methane-producing area of the primary reactor can promote the inter-species electron transfer between microorganisms, so that the metabolic activity of the microorganisms is enhanced.
Description
Technical Field
The invention relates to a multistage anaerobic system for treating organic wastewater at an ambient temperature, belonging to the technical field of anaerobic wastewater treatment.
Background
Organic wastewater is a pollutant composed of natural organic substances in the forms of carbohydrates, proteins, amino acids, fats and the like and certain other biodegradable synthetic organic substances as main elements. The untreated organic wastewater is directly discharged to release various toxic and harmful substances such as ammonia gas, hydrogen sulfide and the like so as to pollute the atmosphere, so that eutrophication pollution of water bodies can be caused, inorganic salts can be accumulated in soil so as to destroy the soil structure and the like, and the ecological environment can be seriously damaged. However, organic matters in the wastewater can be gradually converted and decomposed into gas fuels (hydrogen and methane) by means of the combined action of hydrolytic acidification bacteria, hydrogen-producing and acetogenic bacteria and methanogenic bacteria by means of anaerobic biological treatment technology, so that the energy and resource conversion of the organic wastewater are realized. Research shows that anaerobic digestion can be performed at high temperature (55-60 ℃), medium temperature (35-37 ℃) and low temperature (< 20 ℃) while maintaining a specific temperature, especially high temperature and medium temperature fermentation makes equipment and operation investment too large, while the biological activity of anaerobic microorganisms is reduced under the condition of ambient temperature, so that the rate of utilizing substrates by the microorganisms is reduced, thereby causing accumulation of volatile fatty acids, and pH is reduced, thereby inhibiting the methanogenesis process, and causing reduction of the gas production and organic matter removal efficiency of the reactor.
Chinese patent CN 114671521B discloses an MBR bio-flow off two-phase upflow anaerobic digestion reactor, which is provided with an acidification reactor, a methane bioreactor and an MBR membrane tank, and implements the anaerobic digestion process of two-phase separation in the reactor and entraps a large number of microorganisms, thereby improving the amount of microorganisms in the reactor and the reaction effect.
Chinese patent CN 103058367A discloses a device for treating low-temperature refractory industrial wastewater by using an EGSB-digestion tank, which is combined with a sludge treatment structure digestion tank, and adopts a water outlet backflow technology to make part of high-temperature digested sludge flow into an EGSB reactor, so as to solve the problem of low treatment efficiency when treating refractory industrial wastewater containing toxic substances under low-temperature conditions.
Chinese patent CN 215404271U discloses a novel low-temperature anaerobic biogas fermentation device, which comprises a stirring motor, a temperature sensor and a heat-insulating layer, wherein the temperature is adjusted to reach the optimal reaction value, so that the fermentation flora exerts the maximum activity, the raw materials are fully fermented, and the biogas production capacity is improved.
Chinese patent CN 217895587U discloses a low temperature anaerobic fermentation system, including screening jar and preheating tank through setting up the prescreening module, carries out preheating to the liquid after screening and promotes liquid temperature, can promote anaerobic fermentation's efficiency after the liquid injection fermentation tank after will preheating.
From the prior researches and the technology and process described in the patent, the mode of temperature regulation and water outlet backflow to improve the material transfer efficiency and increase the biomass in the reactor is adopted, so that the performance of the anaerobic reactor for treating wastewater at low temperature is improved. However, the use of temperature regulation to preheat the materials or to heat and preserve the temperature of the reaction system is not economically viable in high latitude areas, particularly in winter. Therefore, the invention designs a set of multistage anaerobic digestion system based on three aspects of improving the mass transfer efficiency, microorganism metabolism activity and increasing the biomass in the reactor.
Disclosure of Invention
The invention aims to solve the technical problem of providing a multistage anaerobic system for treating organic wastewater at an ambient temperature so as to solve the problem of low anaerobic efficiency at the existing ambient temperature or low temperature.
In order to solve the technical problems, the invention provides the following technical scheme: the system comprises a first-stage reactor and a second-stage reactor;
the first-stage reactor is an integrated anaerobic two-phase reactor and comprises a first-stage tank body, an acid-producing area and a methane-producing area, and a three-phase separator;
the first-stage tank body is a hollow column body;
a cover body is arranged at the top of the tank body; a three-phase separator is arranged in the cover body; the side wall of the cover body is provided with a methane generating area air outlet which is communicated with the outside of the reactor;
an acid producing area is arranged in the first-stage tank body and is a hollow column body; the top of the acid producing area is provided with a feeding pipe, and the air outlet of the acid producing area is communicated with the outside of the reactor; a packed bed is arranged in the acid producing area;
the space between the outer wall of the acid producing region and the inner wall of the primary tank body is a methane producing region; conductive medium materials are added into the methane-generating area; the acid producing area is communicated with the methane producing area only at the bottom of the acid producing area through a water distributor; the side wall of the first-stage tank body is provided with a water outlet of a methane generating area;
the secondary reactor is an anaerobic fluidized bed membrane bioreactor and comprises a secondary tank body, a membrane component and a circulating device;
the second-stage tank body is a hollow column;
the side wall of the secondary tank body is provided with a feed inlet and a circulating water outlet, and the bottom of the secondary tank body is provided with a circulating water inlet; circulating water enters the reactor through the circulating device; the secondary tank body is internally provided with a fluidization medium which can be in a fluidization state along with circulating water;
the membrane component is internally arranged in the secondary tank body and is communicated with the outside of the reactor.
Preferably, the applicable reaction temperature of the multistage anaerobic treatment system is 5-60 ℃.
Preferably, the hydraulic retention time ratio of the acid-producing area to the methane-producing area of the primary reactor is 1:2-1:8, the hydraulic retention time of the primary reactor is 3-72 h, and the hydraulic retention time of the secondary reactor is 1-48 h.
Preferably, the acid producing area of the first-stage reactor adopts a down-flow water inlet mode to flow in from a feed pipe, and then enters the methane producing area through a water distributor in an up-flow water inlet mode.
Preferably, the conductive medium material added in the methane-generating zone of the primary reactor is carbon-based or iron-based material, including biochar, activated carbon, carbon cloth, carbon fiber, magnetite, hematite, nano zero-valent iron and the like, and composite material based on carbon and iron.
Preferably, the effluent of the first-stage reactor firstly enters a water collecting tank, sludge after precipitation of the effluent flows back into the first-stage reactor through a backflow port, and the effluent is filtered by a filter screen and then enters the second-stage reactor.
Preferably, the membrane module forms of the secondary reactor include hollow fiber type, plate frame type and circular tube type.
Preferably, the fluidizing medium in the secondary reactor comprises a particulate carbon-based material, a particulate iron-based material, silica, polyethylene terephthalate beads, or the like.
Preferably, the height-to-diameter ratio of the secondary reactor is 5: 1-20: 1.
preferably, the secondary reactor is provided with a circulating device, and the circulating rising flow rate of the circulating device is 1.2-1.5 times of the critical flow rate.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) According to the multistage anaerobic system for treating organic wastewater at the ambient temperature, the acid-producing area of the first-stage reactor firstly adopts a down-flow water inlet mode to feed water, and then enters the methane-producing area in an up-flow mode through the water distributor, so that the efficiency of mass transfer between a substrate and microorganisms is improved;
(2) According to the multistage anaerobic system for treating organic wastewater at the ambient temperature, disclosed by the invention, the conductive medium material added in the methane-producing area of the primary reactor can promote the inter-species electron transfer between microorganisms, so that the metabolic activity of the microorganisms is enhanced;
(3) The multistage anaerobic system for treating organic wastewater at the ambient temperature can separate the hydraulic retention time and the solid retention time of the reactor, and reserves biomass in the reactor;
(4) The multistage anaerobic system for treating organic wastewater at the ambient temperature is characterized in that a circulating system is arranged in a secondary reactor, and a fluidization medium is added to provide a carrier for microorganism growth, so that the mass transfer efficiency of microorganisms and substrates is improved.
Drawings
The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the disclosure and to enable a person skilled in the pertinent art to make and use the disclosure.
FIG. 1 is a schematic diagram of a multistage anaerobic system for treating organic wastewater at ambient temperature according to the present invention.
[ reference numerals ]
1. An air outlet of the acid producing area; 2. a feed pipe; 3. a first-stage tank body; 4. a three-phase separator; 5. an acid producing region; 6. a packed bed; 7. a methane-producing zone; 8. a conductive mediator material; 9. a water distributor; 10. a cover body; 11. a methane-generating region gas outlet; 12. a water outlet; 13. a feed inlet; 14. a fluidizing medium; 15. a secondary tank; 16. an air outlet; 17. a membrane module; 18. a circulating water outlet; 19. a circulation device; 20. a circulating water inlet; 21. a water collection tank; 22. a filter screen; 23. and a return port.
While particular structures and devices are shown in the drawings to enable a clear implementation of embodiments of the invention, this is for illustrative purposes only and is not intended to limit the invention to the particular structures, devices and environments, which may be modified or adapted by those of ordinary skill in the art, as desired, and which remain within the scope of the appended claims.
Detailed Description
Example 1
As shown in fig. 1, an embodiment of the present invention provides a multistage anaerobic system for treating organic wastewater at ambient temperature conditions, comprising two modules of a primary reactor and a secondary reactor;
the primary reactor is an integrated anaerobic two-phase reactor and comprises a primary tank body 3, an acid production zone 5 and a methane production zone 7, and a three-phase separator 4;
the first-stage tank body 3 is a hollow column body;
the top of the primary tank body 3 is provided with a cover body 10; the three-phase separator 4 is arranged in the cover body 10; the side wall of the cover body 10 is provided with a methane generating area gas outlet 11 which is communicated with the outside of the reactor;
an acid producing area 5 which is a hollow column body is arranged in the first-stage tank body 3; the top of the acid producing area 5 is provided with a feed pipe 2, and an air outlet 1 of the acid producing area 5 is communicated with the outside of the reactor; a packed bed 6 is arranged in the acid producing area 5;
the space between the outer wall of the acid producing area 5 and the inner wall of the primary tank body 3 is a methane producing area 7; a conductive medium material 8 is added in the methane-generating zone 7; the acid producing area 5 and the methane producing area 7 are communicated through a water distributor 9 only at the bottom of the acid producing area 5; the side wall of the primary tank body 3 is provided with a water outlet 12 of a methane generating area;
the secondary reactor is an anaerobic fluidized bed membrane bioreactor and comprises a secondary tank body 15, a membrane component 17 and a circulating device 19;
a hollow column of the secondary tank 15;
the side wall of the secondary tank body 15 is provided with a feed inlet 13 and a circulating water outlet 18, and the bottom of the secondary tank body 15 is provided with a circulating water inlet 20; circulating water enters the reactor through a circulating device 19; the second-stage tank body 15 is internally provided with a fluidization medium 14 which can be in a fluidization state in the second-stage tank body 15 along with circulating water;
the membrane module 17 is arranged in the secondary tank 15 and communicated with the outside of the reactor.
Example 2
According to the technical scheme provided by the invention, the applicable reaction temperature of the multistage anaerobic treatment system is 5-60 ℃.
According to the technical scheme provided by the invention, the hydraulic retention time ratio of the acid production area 5 to the methane production area 7 of the primary reactor is 1:2-1:8, the hydraulic retention time of the primary reactor is 3-72 h, and the hydraulic retention time of the secondary reactor is 1-48 h.
According to the technical scheme provided by the invention, the acid producing region 5 of the primary reactor flows in from the feeding pipe 2 in a down-flow water inlet mode, and then enters the methane producing region 7 in an up-flow water inlet mode through the water distributor 9.
According to the technical scheme provided by the invention, the conductive mediator material 8 added in the methane-generating zone 7 of the primary reactor is a carbon-based and iron-based material, and comprises biochar, activated carbon, carbon cloth, carbon fiber, magnetite, hematite, nano zero-valent iron and the like, and a composite material based on carbon and iron.
In this embodiment: the acid-producing zone 5 of the integrated anaerobic two-phase reactor, the hydrolytic acid-producing hydrogen-producing microorganism inoculated in the acid-producing zone 5 hydrolyzes and acidizes the wastewater, the produced hydrogen is collected through the gas outlet 1 of the acid-producing zone, the produced primary liquid-phase product is fermented through the granular sludge bed of the methane-producing zone, the fermented gas is collected through the gas outlet 11 of the methane-producing zone through the three-phase separator 4, the anaerobic two-phase reaction improves the mass transfer efficiency of the microorganism and the substrate, and the removal efficiency of the organic matters and the methane yield are improved.
Example 3
According to the technical scheme provided by the invention, the effluent of the primary reactor firstly enters the water collecting tank 21, sludge after precipitation of the effluent flows back into the primary reactor through the backflow port 23, and the effluent is filtered by the filter screen 22 and then enters the secondary reactor.
The technical scheme provided by the invention is that the membrane component 17 of the secondary reactor comprises a hollow fiber type, a plate frame type and a circular tube type.
According to the technical scheme provided by the invention, the fluidization medium 14 in the secondary reactor comprises a granular carbon-based material, a granular iron-based material, silicon dioxide, polyethylene terephthalate beads and the like.
According to the technical scheme provided by the invention, the height-diameter ratio of the secondary reactor is 5: 1-20: 1.
according to the technical scheme provided by the invention, the circulating device 19 is arranged in the secondary reactor, and the circulating rising flow rate of the circulating device 19 is 1.2-1.5 times of the critical flow rate.
In this embodiment: the total organic carbon removal and methane yield values for the operation of the present multistage anaerobic system at an organic load of 20 g COD/L/d are listed in the following table:
| temperature (. Degree. C.) | Total organic carbon removal (%) | Methane yield (L/g COD) |
| 35 | 97.56±0.60 | 0.326±0.011 |
| 30 | 97.18±1.37 | 0.315±0.008 |
| 25 | 96.94±1.59 | 0.309±0.010 |
| 20 | 87.94±4.81 | 0.295±0.011 |
| 15 | 83.29±6.61 | 0.287±0.016 |
| 10 | 81.36±6.51 | 0.244±0.010 |
Note that: the theoretical yield of methane was 0.35L/g COD.
The working process of the invention is as follows:
when the organic wastewater is treated, the method can be operated at the temperature of 5-60 ℃.
Before the organic wastewater is treated, an acid-producing area and a methane-producing area of the primary reactor are respectively inoculated with 20% (v/v) and 60% (v/v) anaerobic granular sludge.
The organic wastewater enters an acid-producing zone 5 of the integrated anaerobic two-phase reactor through a feed pipe 2 in a down-flow mode, hydrolysis acid-producing hydrogen-producing microorganisms inoculated in the acid-producing zone 5 carry out hydrolysis acidification on the wastewater to produce hydrogen and primary liquid-phase products, and the produced hydrogen is collected through an air outlet 1 of the acid-producing zone. The primary liquid phase product is fed into the methane producing area 7 through the water distributor 9 in an upflow mode, and fermented through the granular sludge bed of the methane producing area to produce methane and secondary liquid phase product. Methane gas is collected through the three-phase separator 4 via the methane-generating zone gas outlet 11.
The produced secondary liquid product flows out of the primary reactor through the water outlet 12, then enters the water collecting tank 21, the sludge after precipitation of the effluent flows back into the primary reactor through the reflux port 23, the effluent is filtered through the filter screen 22 and then enters the secondary reactor through the feed port 13, fermentation is carried out in the fluidized bed membrane bioreactor, the gas product produced after the reaction is collected through the gas outlet 16, and the liquid product produced after the reaction flows out through the membrane component 17.
Claims (10)
1. A multi-stage anaerobic system for treating organic wastewater at ambient temperature conditions, comprising a multi-stage anaerobic treatment system comprising: a primary reactor and a secondary reactor;
the primary reactor is an integrated anaerobic two-phase reactor and comprises a primary tank body (3), an acid production zone (5), a methane production zone (7) and a three-phase separator (4);
the primary tank body (3) is a hollow column body;
a cover body (10) is arranged at the top of the primary tank body (3); a three-phase separator (4) is arranged in the cover body (10); the side wall of the cover body (10) is provided with a methane generating area air outlet (11) which is communicated with the outside of the reactor;
an acid producing area (5) is arranged in the first-stage tank body (3) and is a hollow column body; the top of the acid producing area (5) is provided with a feeding pipe (2), and an air outlet (1) of the acid producing area (5) is communicated with the outside of the reactor; a packed bed (6) is arranged in the acid producing area (5);
the space between the outer wall of the acid producing region (5) and the inner wall of the primary tank body (3) is a methane producing region (7); a conductive medium material (8) is added in the methane-generating area (7); the acid producing area (5) is communicated with the methane producing area (7) only at the bottom of the acid producing area (5) through a water distributor (9); the side wall of the first-stage tank body (3) is provided with a water outlet (12) of a methane generating area;
the secondary reactor is an anaerobic fluidized bed membrane bioreactor and comprises a secondary tank body (15), a membrane assembly (17) and a circulating device (19);
the secondary tank body (15) is a hollow column body;
the side wall of the secondary tank body (15) is provided with a feed inlet (13) and a circulating water outlet (18), and the bottom of the secondary tank body (15) is provided with a circulating water inlet (20); circulating water enters the reactor through a circulating device (19); the secondary tank body (15) is internally provided with a fluidization medium (14) which can be in a fluidization state in the secondary tank body (15) along with circulating water;
the membrane component (17) is internally arranged in the secondary tank body (15) and is communicated with the outside of the reactor.
2. The multistage anaerobic system for treating organic wastewater under the condition of ambient temperature according to claim 1, wherein the applicable reaction temperature of the multistage anaerobic treatment system is 5-60 ℃.
3. The multistage anaerobic system for treating organic wastewater at ambient temperature according to claim 1, wherein the hydraulic retention time ratio of the acid-producing zone (5) to the methane-producing zone (7) of the primary reactor is 1:2-1:8, the hydraulic retention time of the primary reactor is 3-72 h, and the hydraulic retention time of the secondary reactor is 1-48 h.
4. The multistage anaerobic system for treating organic wastewater under the condition of environmental temperature according to claim 1, wherein the primary reactor acid-producing zone (5) flows in from a feed pipe (2) in a down-flow water inlet mode and then enters a methane-producing zone (7) in an up-flow water inlet mode through a water distributor (9).
5. A multistage anaerobic system for treating organic wastewater under ambient temperature conditions according to claim 1, wherein the primary reactor methanogenic zone (7) is added with a conductive mediator material (8) which is a carbon-based, iron-based material including biochar, activated carbon, carbon cloth, carbon fiber, magnetite, hematite, nano zero-valent iron and carbon and iron based composites.
6. A multistage anaerobic system for treating organic wastewater at ambient temperature according to claim 1, wherein the effluent from the primary reactor is first collected in a water collection tank (21), the sludge after precipitation from the effluent is returned to the primary reactor through a return port (23), and the effluent is filtered by a filter screen (22) and then enters the secondary reactor.
7. A multistage anaerobic system for treating organic wastewater at ambient temperature according to claim 1, wherein said membrane modules (17) of said secondary reactors are in the form of hollow fiber, plate and frame and circular tubes.
8. A multistage anaerobic system for treating organic wastewater at ambient temperature conditions according to claim 1, wherein the fluidization medium (14) in the secondary reactor comprises particulate carbon-based material, particulate iron-based material, silica, polyethylene terephthalate beads.
9. A multistage anaerobic system for treating organic wastewater at ambient temperature according to claim 1, wherein said secondary reactor has an aspect ratio of 5: 1-20: 1.
10. the multistage anaerobic system for treating organic wastewater under the condition of ambient temperature according to claim 1, wherein the secondary reactor is provided with a circulating device (19), and the circulating rising flow rate of the circulating device (19) is 1.2-1.5 times of the critical flow rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311250856.XA CN116986721A (en) | 2023-09-26 | 2023-09-26 | Multistage anaerobic system for treating organic wastewater under environment temperature condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202311250856.XA CN116986721A (en) | 2023-09-26 | 2023-09-26 | Multistage anaerobic system for treating organic wastewater under environment temperature condition |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107043160A (en) * | 2017-05-18 | 2017-08-15 | 大连理工大学 | A kind of diphasic anaerobic processing unit and technique strengthened based on magnetic iron ore and activated carbon |
| CN110066014A (en) * | 2019-05-10 | 2019-07-30 | 广州大学 | A kind of Anammox fluidized bed film bioreactor device and operation method |
| CN114672399A (en) * | 2022-03-24 | 2022-06-28 | 上海市机电设计研究院有限公司 | Integrated vertical two-phase anaerobic reaction device and process |
| CN115231699A (en) * | 2022-07-05 | 2022-10-25 | 江苏沛尔膜业股份有限公司 | Anaerobic membrane bioreactor for wastewater treatment and wastewater treatment method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107043160A (en) * | 2017-05-18 | 2017-08-15 | 大连理工大学 | A kind of diphasic anaerobic processing unit and technique strengthened based on magnetic iron ore and activated carbon |
| CN110066014A (en) * | 2019-05-10 | 2019-07-30 | 广州大学 | A kind of Anammox fluidized bed film bioreactor device and operation method |
| CN114672399A (en) * | 2022-03-24 | 2022-06-28 | 上海市机电设计研究院有限公司 | Integrated vertical two-phase anaerobic reaction device and process |
| CN115231699A (en) * | 2022-07-05 | 2022-10-25 | 江苏沛尔膜业股份有限公司 | Anaerobic membrane bioreactor for wastewater treatment and wastewater treatment method thereof |
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