CN114853283A - Kitchen biogas slurry wastewater treatment device and treatment process thereof - Google Patents
Kitchen biogas slurry wastewater treatment device and treatment process thereof Download PDFInfo
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- CN114853283A CN114853283A CN202210586769.0A CN202210586769A CN114853283A CN 114853283 A CN114853283 A CN 114853283A CN 202210586769 A CN202210586769 A CN 202210586769A CN 114853283 A CN114853283 A CN 114853283A
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- 239000002002 slurry Substances 0.000 title claims abstract description 79
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000012528 membrane Substances 0.000 claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 238000007034 nitrosation reaction Methods 0.000 claims abstract description 45
- 230000009935 nitrosation Effects 0.000 claims abstract description 40
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000010865 sewage Substances 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 18
- 230000000712 assembly Effects 0.000 claims abstract description 14
- 238000000429 assembly Methods 0.000 claims abstract description 14
- 238000005273 aeration Methods 0.000 claims description 72
- 239000002351 wastewater Substances 0.000 claims description 53
- 239000010802 sludge Substances 0.000 claims description 42
- 241000894006 Bacteria Species 0.000 claims description 24
- 239000000945 filler Substances 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 18
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims description 16
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 16
- 229910052698 phosphorus Inorganic materials 0.000 claims description 16
- 239000011574 phosphorus Substances 0.000 claims description 16
- 238000011049 filling Methods 0.000 claims description 12
- 239000004519 grease Substances 0.000 claims description 11
- 238000005192 partition Methods 0.000 claims description 11
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 7
- 230000035484 reaction time Effects 0.000 claims description 7
- 239000006228 supernatant Substances 0.000 claims description 7
- 239000002957 persistent organic pollutant Substances 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 235000012054 meals Nutrition 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 238000000926 separation method Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000010992 reflux Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000855 fermentation Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000010806 kitchen waste Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002071 nanotube Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- 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
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
-
- 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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a kitchen biogas slurry wastewater treatment device and a treatment process thereof, and belongs to the technical field of wastewater treatment equipment. Comprises a tank body, wherein an anaerobic tank, a front anoxic tank, an aerobic tank, a rear anoxic tank and a membrane tank are arranged in the tank body; one side of the anaerobic tank is communicated with a sewage pipe; the top end of the rear anoxic tank is communicated with a carbon source feeding pipe, the bottom end of the aerobic tank is communicated with a nitrosation liquid return pipe, one end of the nitrosation liquid return pipe is communicated with the bottom end of the front anoxic tank, and a return pump is arranged on the nitrosation liquid return pipe; the membrane pool is internally provided with a plurality of plate-type membrane assemblies, the output ends of the plate-type membrane assemblies are communicated with a water outlet pipe, one end of the water outlet pipe penetrates out of the membrane pool, and a water outlet pump is arranged on the pipe section of the water outlet pipe. The invention solves the problems of unstable treatment effect, difficult standard reaching of total nitrogen and the like of the kitchen biogas slurry wastewater treatment equipment in the prior art.
Description
Technical Field
The invention relates to a kitchen biogas slurry wastewater treatment device and a treatment process thereof, and belongs to the technical field of wastewater treatment equipment.
Background
The biogas slurry generated by anaerobic nitrification of the concentrated kitchen waste slurry water has COD concentration still up to 10000-15000 mg/L and ammonia nitrogen concentration up to 2000-3000 mg/L, and because the salt concentration of the biogas slurry is high, the biogas slurry is directly used for agriculture and forestry, and has a great risk in fashion, so the biogas slurry is generally required to be treated to meet the nano-tube standard and then discharged to an urban sewage plant for further treatment. Because the anaerobic biogas slurry of the kitchen waste has high greaseHigh ammonia nitrogen and low carbon nitrogen ratio, adopts the traditional A 2 When the/O process is used for treatment, a large amount of alkalinity needs to be supplemented to the aerobic section, a large amount of carbon sources needs to be supplemented to the anoxic section, and most of the problems of unstable treatment effect, difficulty in reaching the standard of total nitrogen, high treatment cost and the like exist.
The patent document with the prior art application number of CN202020156435.6 discloses a kitchen biogas slurry wastewater treatment device, which comprises a sewage treatment unit, wherein the sewage treatment unit is sequentially divided into a first membrane tank, a first aerobic tank, an anoxic tank, a second aerobic tank and a second membrane tank by partition plates; the bottoms of the first membrane pool and the second membrane pool are both provided with water inlets, and the water inlets are connected with automatic control switches of electromagnetic valves; the first membrane pool and the second membrane pool are communicated through a transmission pipeline, and a sewage pump is arranged on the transmission pipeline; membrane assemblies are arranged in the first membrane pool and the second membrane pool, and the membrane assemblies are connected with a water outlet pump through a water outlet pipeline; aeration discs are arranged at the bottoms of the first membrane tank, the second membrane tank, the first aerobic tank and the second aerobic tank, the aeration discs are connected with an aeration pipeline, and an aeration pump is arranged on the aeration pipeline; the partition board is provided with a communicating port, and the communicating port is provided with a grid.
The kitchen biogas slurry wastewater treatment equipment in the prior art has the problems of unstable treatment effect, difficulty in reaching the standard of total nitrogen and the like, so the invention provides a kitchen biogas slurry wastewater treatment device and a treatment process thereof for solving the problems.
Disclosure of Invention
In order to overcome the defects of unstable treatment effect, difficult standard reaching of total nitrogen and the like of the conventional kitchen biogas slurry wastewater treatment equipment, the invention designs the kitchen biogas slurry wastewater treatment device and the treatment process thereof, and the kitchen biogas slurry wastewater treatment device has high treatment efficiency and good effect on kitchen biogas slurry wastewater.
In order to achieve the purpose, the invention adopts the following technical scheme:
a kitchen biogas slurry wastewater treatment device comprises a pool body, wherein an anaerobic pool, a front anoxic pool, an aerobic pool, a rear anoxic pool and a membrane pool are arranged in the pool body, and the anaerobic pool, the front anoxic pool, the aerobic pool, the rear anoxic pool and the membrane pool are sequentially communicated; one side of the anaerobic tank is communicated with a sewage pipe, the inner bottoms of the anaerobic tank, the front anoxic tank and the rear anoxic tank are fixedly provided with first aeration components for biogas aeration, and the inner bottom of the aerobic tank is fixedly provided with a second aeration component; the top end of the rear anoxic tank is communicated with a carbon source feeding pipe, the bottom end of the aerobic tank is communicated with a nitrosation liquid return pipe, one end of the nitrosation liquid return pipe is communicated with the bottom end of the front anoxic tank, and a return pump is arranged on the nitrosation liquid return pipe; the membrane pool is internally provided with a plurality of plate-type membrane assemblies, the output ends of the plate-type membrane assemblies are communicated with a water outlet pipe, one end of the water outlet pipe penetrates out of the membrane pool, and a water outlet pump is arranged on the pipe section of the water outlet pipe.
The anaerobic tank, the front anoxic tank, the aerobic tank, the rear anoxic tank and the membrane tank are sequentially communicated through connectors on the corresponding partition plates.
The anaerobic tank is characterized in that the top end of the anaerobic tank is communicated with a biogas collecting pipe, one end of the biogas collecting pipe is communicated with a biogas collecting tank, the output end of the biogas collecting tank is communicated with an aeration pump, the output end of the aeration pump is communicated with a connecting main pipe, the connecting main pipe is communicated with a plurality of connecting branch pipes, and one ends of the connecting branch pipes are respectively communicated with the first aeration assemblies.
The membrane tank is internally provided with a plurality of aeration disks, the aeration disks and the plate-type membrane assemblies are arranged at intervals in a staggered mode, an air pump is arranged outside the tank body, the output end of the air pump is communicated with a plurality of branch pipes, and the air pump is communicated with the water outlet pipe, the second aeration assembly and the aeration disks through the branch pipes.
The anaerobic tank, the front anoxic tank and the rear anoxic tank are all internally provided with suspended fillers, and the aerobic tank is internally provided with suspended fillers.
The bottom in the membrane tank is fixedly provided with a sewage collecting hopper, the bottom end of the sewage collecting hopper is communicated with a sludge return pipe, one end of the sludge return pipe is communicated with the bottom end of the anaerobic tank, and a sludge pump is arranged on a pipe section of the sludge return pipe.
One side of the anaerobic tank close to the top is communicated with an oil discharge pipe.
And filter screens are fixedly arranged in the connecting ports.
And N treatment units consisting of a front anoxic tank and an aerobic tank can be arranged between the anaerobic tank and the rear anoxic tank, wherein N is a positive integer.
And a powdered activated carbon filler or a suspended filler is arranged in the membrane tank.
A kitchen biogas slurry wastewater treatment process comprises the following steps:
s1: filling a treatment liquid rich in phosphorus accumulating bacteria into the anaerobic tank, filling a nitrosation liquid into the front anoxic tank, filling a treatment liquid rich in nitrosation bacteria into the aerobic tank, and filling a treatment liquid containing a certain amount of denitrifying bacteria into the rear anoxic tank;
s2: introducing the kitchen biogas slurry wastewater into an anaerobic tank, performing biogas aeration on the kitchen biogas slurry wastewater by using a first aeration component for 0.5-1d, floating grease contained in the kitchen biogas slurry wastewater to an upper layer after aeration, discharging the grease to the outside of the device through an oil discharge pipe 22, releasing phosphorus from phosphorus accumulating bacteria in the wastewater in an anaerobic environment, and introducing the kitchen biogas slurry wastewater into a front anoxic tank;
s3: the kitchen biogas slurry wastewater enters a front anoxic tank, the kitchen biogas slurry wastewater is mixed with nitrosation liquid in the front anoxic tank, in an anoxic environment, the nitrosation liquid fully performs short-range denitrification and denitrification reaction by using organic matters in inlet water as a carbon source to generate nitrogen and discharge the nitrogen, the reaction time is 3-10 days, and then the kitchen biogas slurry wastewater enters an aerobic tank;
s4: enabling the kitchen biogas slurry wastewater to enter an aerobic tank, controlling the temperature of 30-35 ℃ in the aerobic tank, and controlling the dissolved oxygen to be 0.8-1.2mg/L, wherein ammonia nitrogen contained in the kitchen biogas slurry wastewater is subjected to nitrosation reaction under the action of nitrosation bacteria to generate nitrite nitrogen and alkalinity, the nitrite nitrogen and the alkalinity flow back to a front anoxic tank along with a nitrosation liquid, and the nitrosation liquid reflux amount is 100-400%; phosphorus contained in the kitchen biogas slurry wastewater is re-absorbed by phosphorus accumulating bacteria and accumulated in suspended sludge; organic pollutant COD contained in the kitchen biogas slurry wastewater is subjected to assimilation or dissimilation reaction in the aerobic tank, the COD concentration is greatly reduced, the reaction time in the process is 10-30d, and then the kitchen biogas slurry wastewater enters the post-anoxic tank;
s5: enabling the kitchen biogas slurry wastewater to enter a post-anoxic tank, carrying out denitrification reaction on the residual nitrite nitrogen in the wastewater by denitrifying bacteria under an anoxic environment by using the residual organic matters in the wastewater as a carbon source to generate nitrogen, further removing the nitrite nitrogen and organic pollutants, reacting for 1h, and then introducing effluent into a membrane tank;
s6: and (3) enabling the effluent to enter a membrane tank, precipitating suspended sludge in the sewage under the action of gravity, layering the sewage, collecting the sludge at the upper layer at the bottom of the tank, pumping the supernatant through a plate-type membrane assembly, and refluxing the precipitated sludge at the lower layer to an anaerobic tank through a sludge reflux pipe.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
according to the kitchen biogas slurry wastewater treatment method, the anaerobic tank, the front anoxic tank, the aerobic tank, the rear anoxic tank and the membrane tank are arranged, kitchen biogas slurry wastewater is subjected to grease separation in the anaerobic tank, short-range denitrification and denitrification reaction is fully performed in the front anoxic tank, nitrosation reaction is performed in the aerobic tank to generate nitrite nitrogen and alkalinity and reduce COD concentration, residual organic matters in the wastewater are used as carbon sources in the rear anoxic tank, denitrification reaction is performed on the residual nitrite nitrogen in the wastewater, and finally precipitation separation is performed in the membrane tank, so that the kitchen biogas slurry wastewater treatment effect is stable, and the kitchen biogas slurry wastewater total nitrogen control effect is good;
according to the invention, through the arrangement of the carbon source adding pipe and the nitrosation liquid return pipe, the carbon source adding pipe ensures that the carbon source required by the denitrification reaction in the rear anoxic tank is sufficient, the nitrosation liquid return pipe enables the nitrosation liquid in the aerobic tank to return to the front anoxic tank, and the denitrification reaction is fully performed under the environment of the front anoxic tank with sufficient carbon source, so that generated nitrogen is discharged out of a system, and the stable wastewater treatment effect and the standard reaching of ammonia nitrogen are further ensured;
according to the invention, by collecting the biogas generated in the anaerobic tank and the anoxic tank and circularly stirring the anaerobic tank and the anoxic tank through the first aeration component, compared with the traditional mechanical stirring, the stirring efficiency is improved, and meanwhile, the generated small bubbles are utilized to adsorb the grease in the water and lift the grease to the upper layer of the liquid level, and the grease is discharged through the oil discharge pipe, so that the oil-water separation is realized, and the pollution of downstream oil stains is alleviated;
the membrane module replaces the traditional secondary sedimentation tank to realize mud-water separation, the effluent water quality is good, and the microorganism is intercepted by the membrane module to ensure that the high-level biomass can be maintained in the aerobic tank, so that the reaction efficiency is improved;
the invention adopts the mode that the aeration disc and the membrane component are arranged at intervals, the scouring effect of aeration on the membrane component is greatly enhanced, and the membrane pollution is delayed 2 The backflow sludge concentration of the/O + MBR process is low, and the backflow amount is large;
the invention utilizes the principle of short-cut nitrification and denitrification to remove total nitrogen, compared with the traditional A 2 Compared with denitrification by the O process, the reaction efficiency is improved, about 40 percent of external carbon source (calculated by methanol) and 25 percent of oxygen supply are saved, and the temperature of the effluent water of the biogas slurry after anaerobic fermentation is maintained at 35 ℃, so that the requirement of a short-cut nitrification and denitrification system on the temperature is met, and good conditions are provided for a short-cut nitrification and denitrification operator of the system.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic top layer structure of the present invention;
FIG. 3 is a schematic of the underlying structure of the present invention;
FIG. 4 is a schematic view of the overall structure of the plate-type membrane module according to the present invention;
fig. 5 is a schematic view of the overall structure of the aeration disk according to the present invention.
Wherein the reference numerals are: 10. a tank body; 11. a partition plate; 12. a connecting port; 13. filtering with a screen; 20. an anaerobic tank; 21. a sewage pipe; 22. an oil discharge pipe; 30. a pre-anoxic tank; 40. an aerobic tank; 41. a nitrosation liquid return pipe; 42. a reflux pump; 50. a post anoxic tank; 51. a carbon source feeding pipe; 60. a membrane tank; 61. a sewage collecting hopper; 62. a sludge return pipe; 63. a sludge pump; 64. a plate-type membrane module; 65. an aeration disc; 66. a water outlet pipe; 67. discharging the water pump; 68. an air pump; 69. a branch pipe; 71. a biogas collecting pipe; 72. a biogas collection tank; 73. an aeration pump; 74. connecting a main pipe; 75. connecting branch pipes; 80. a first aeration assembly; 81. a second aeration assembly; 82. suspending the filler; 83. and (4) suspending the filler.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1 to 5, the kitchen biogas slurry wastewater treatment apparatus of the embodiment includes a tank body 10, the tank body 10 is made of a heat insulating material, an anaerobic tank 20, a front anoxic tank 30, an aerobic tank 40, a rear anoxic tank 50 and a membrane tank 60 are disposed in the tank body 10, and the anaerobic tank 20, the front anoxic tank 30, the aerobic tank 40, the rear anoxic tank 50 and the membrane tank 60 are sequentially communicated; a sewage pipe 21 is communicated with one side of the anaerobic tank 20, a first aeration component 80 for biogas aeration is fixedly arranged at the bottom of each of the anaerobic tank 20, the front anoxic tank 30 and the rear anoxic tank 50, a second aeration component 81 is fixedly arranged at the bottom of the aerobic tank 40, and the first aeration component and the second aeration component can be used for mixing sewage and preventing sludge from sinking to the bottom; the top end of the rear anoxic tank 50 is communicated with a carbon source adding pipe 51, the bottom end of the aerobic tank 40 is communicated with a nitrosation liquid return pipe 41, one end of the nitrosation liquid return pipe 41 is communicated with the bottom end of the front anoxic tank 30, and a return pump 42 is arranged on the nitrosation liquid return pipe 41; a plurality of plate-type membrane assemblies 64 are arranged in the membrane pool 60, the plate-type membrane assemblies 64 are used for realizing mud-water separation, the output ends of the plate-type membrane assemblies 64 are communicated with a water outlet pipe 66, one end of the water outlet pipe 66 penetrates out of the membrane pool 60, and a water outlet pump 67 is arranged on the pipe section of the water outlet pipe 66.
Further, four partition plates 11 are fixedly arranged in the tank body 10, the tank body 10 is divided into an anaerobic tank 20, a front anoxic tank 30, an aerobic tank 40, a rear anoxic tank 50 and a membrane tank 60 by the four partition plates 11, connecting ports 12 are formed in the partition plates 11, the connecting ports 12 are arranged in a vertically staggered mode to prevent short flow, and the anaerobic tank 20, the front anoxic tank 30, the aerobic tank 40, the rear anoxic tank 50 and the membrane tank 60 are communicated through the connecting ports 12 in the corresponding partition plates 11.
Furthermore, the top end of the anaerobic tank 20 is communicated with a biogas collecting pipe 71, one end of the biogas collecting pipe 71 is communicated with a biogas collecting tank 72, the output end of the biogas collecting tank 72 is communicated with an aeration pump 73, the output end of the aeration pump 73 is communicated with a connecting main pipe 74, the connecting main pipe 74 is communicated with a plurality of connecting branch pipes 75, one end of each connecting branch pipe 75 is respectively communicated with the first aeration assemblies 80 in each tank, and biogas generated in the anaerobic tank can be recycled through the arrangement of the biogas collecting pipe, the biogas collecting tank and the aeration pump.
Further, three groups of aeration discs 65 are arranged in the membrane pool 60, the aeration discs 65 are formed by assembling a plurality of perforated aeration pipes, the aeration discs 65 and the plate-type membrane modules 64 are arranged at intervals in a staggered manner, an air pump 68 is arranged outside the pool body 10, the output end of the air pump 68 is communicated with a plurality of branch pipes 69, the air pump 68 is respectively communicated with a water outlet pipe 66, a second aeration module 81 and the aeration discs 65 through the branch pipes 69, electric valves are arranged on the branch pipes 69, a control valve is arranged on the water outlet pipe 66, the connecting positions of the branch pipes 69 and the water outlet pipe 66 are positioned between the control valve and the plate-type membrane modules 64, through the arrangement of the aeration discs and the plate-type membrane modules, the plate-type membrane modules are used for assisting the water outlet pump to pump out clear liquid, the aeration discs can prevent the plate-type membrane modules from being blocked, and simultaneously, the air pump is communicated with the water outlet pipe, the second aeration modules and the aeration discs through the branch pipes, so that the air pump can back flush the water outlet pipe while supplying air to the second aeration modules and the aeration discs, further avoiding the blockage of the water outlet pipe.
Further, suspended fillers 82 are arranged in the anaerobic tank 20, the front anoxic tank 30 and the rear anoxic tank 50, suspended fillers 83 are arranged in the aerobic tank 40, the suspended fillers 83 are one or more light porous materials, such as diatomite, bentonite and ceramsite, and the suspended fillers are elastic fillers or carbon fiber fillers.
Further, the bottom in the membrane pool 60 is fixedly provided with a sewage collecting hopper 61, the bottom end of the sewage collecting hopper 61 is communicated with a sludge return pipe 62, one end of the sludge return pipe 62 is communicated with the bottom end of the anaerobic pool 20, a sludge pump 63 is arranged on the pipe section of the sludge return pipe 62, and the microbial biomass stability of the system is ensured through the arrangement of the sludge return pipe and the sludge pump, so that the defects of low concentration and large return flow of returned sludge in the traditional A2/O + MBR process are avoided.
Furthermore, an oil discharge pipe 22 is communicated with one side of the anaerobic tank 20 close to the top, and the oil liquid floating in the anaerobic tank 20 can be discharged through the oil discharge pipe 22.
Further, all fixedly in the connector 12 be provided with filter screen 13, filter screen 13 has prevented that the interior filler of each pond from running off.
Furthermore, N treatment units consisting of the front anoxic tank 30 and the aerobic tank 40 can be arranged between the anaerobic tank 20 and the rear anoxic tank 50, wherein N is a positive integer.
Further, the membrane tank 60 is provided with powdered activated carbon filler or suspended filler 83, and the suspended filler 83 is one or more light porous materials, such as diatomite, bentonite and ceramsite.
A kitchen biogas slurry wastewater treatment process comprises the following steps:
s1: filling a treatment liquid rich in phosphorus accumulating bacteria into the anaerobic tank 20, filling a nitrosation liquid into the front anoxic tank 30, filling a treatment liquid rich in nitrosation bacteria into the aerobic tank 40, and filling a treatment liquid containing a certain amount of denitrifying bacteria into the rear anoxic tank 50;
s2: introducing the kitchen biogas slurry wastewater into an anaerobic tank 20, performing biogas aeration on the kitchen biogas slurry wastewater under the action of a first aeration component 80 for 0.5-1d, floating oil contained in the kitchen biogas slurry wastewater to the upper layer after aeration, discharging the oil out of the device through an oil discharge pipe 22, releasing phosphorus from phosphorus accumulating bacteria in the wastewater under an anaerobic environment, and introducing the kitchen biogas slurry wastewater into a front anoxic tank 30;
s3: the kitchen biogas slurry wastewater enters a front anoxic tank 30, the kitchen biogas slurry wastewater is mixed with nitrosation liquid in the front anoxic tank 30, in an anoxic environment, the nitrosation liquid fully performs short-range denitrification reaction by using organic matters in inlet water as a carbon source to generate nitrogen and discharge the nitrogen, the reaction time is 3-10 days, and then the kitchen biogas slurry wastewater enters an aerobic tank 40;
s4: enabling the kitchen biogas slurry wastewater to enter an aerobic tank 40, controlling the temperature in the aerobic tank 40 to be 30-35 ℃, controlling the dissolved oxygen to be 0.8-1.2mg/L, enabling ammonia nitrogen contained in the kitchen biogas slurry wastewater to undergo a nitrosation reaction under the action of nitrosation bacteria to generate nitrite nitrogen and alkalinity, and enabling the nitrite nitrogen and the alkalinity to flow back to a front anoxic tank 30 along with a nitrosation liquid, wherein the backflow amount of the nitrosation liquid is 100-400% of the water inflow; phosphorus contained in the kitchen biogas slurry wastewater is reabsorbed by phosphorus accumulating bacteria and accumulated in suspended sludge; organic pollutant COD contained in the kitchen biogas slurry wastewater also carries out assimilation or dissimilation reaction in the aerobic tank 40, the COD concentration is greatly reduced, the reaction time in the process is 10-30d, and then the kitchen biogas slurry wastewater enters the post-anoxic tank 50;
s5: the kitchen biogas slurry wastewater enters a post-anoxic tank 50, denitrifying bacteria perform a denitrifying reaction on the remaining nitrite nitrogen in the wastewater by using the remaining organic matters in the wastewater as a carbon source under an anoxic environment to generate nitrogen, further remove the nitrite nitrogen and organic pollutants, the reaction time is 1h, and then effluent is introduced into a membrane tank 60;
s6: the effluent enters a membrane tank 60, suspended sludge in the sewage is precipitated under the action of gravity, the sewage is layered, supernatant is arranged on the upper layer, the sludge is gathered at the bottom of the tank, the supernatant is pumped out through a plate-type membrane component 64, and the sludge precipitated at the lower layer flows back to the anaerobic tank 20 through a sludge return pipe 62.
The working principle of the invention is as follows: the sewage treatment device adopts A aiming at the treatment problem of the kitchen biogas slurry 2 The treatment device combining the/O process, the short-cut nitrification and denitrification wastewater treatment process and the membrane filtration process has the advantages that the kitchen biogas slurry is a product obtained after anaerobic fermentation, the temperature of the biogas slurry is about 35 ℃, the wall of a tank body of the device is made of heat-insulating materials, and the operating temperature of a treatment unit can be kept at 30-35 ℃;
the kitchen biogas slurry wastewater enters an anaerobic tank 20 from a sewage pipe 21, is fully mixed with activated sludge under the stirring action of biogas, and phosphorus accumulating bacteria in the activated sludge fully release phosphorus under the anaerobic condition; meanwhile, the first aeration component 80 at the bottom generates fine bubbles through aeration, the fine bubbles are adsorbed on the surface of the grease in the water, the grease is lifted to the top of the liquid level, and the grease is discharged out of the device through the oil discharge pipe 22; the biogas slurry generates a small amount of biogas in an anaerobic environment, enters a biogas collecting tank 72 through a biogas collecting pipe 71 arranged at the top of the anaerobic tank for storage, and simultaneously, under the action of an aeration pump 73, the anaerobic tank 20, the front anoxic tank 30 and the rear anoxic tank 50 are subjected to bottom aeration stirring to mix sewage and prevent sludge from sinking to the bottom;
the effluent of the anaerobic tank 20 enters the front anoxic tank 30 through the connecting port 12, and is mixed with nitrosation liquid flowing back from the aerobic tank 40 to carry out denitrification reaction under the action of biogas stirring, the effluent of the front anoxic tank 30 enters the aerobic tank 40, the temperature of the whole system is controlled to be about 30-35 ℃, the dissolved oxygen in the aerobic tank is about 0.8-1.2mg/L, under the condition, the aerobic tank 40 is rich in nitrosation bacteria, ammonia nitrogen contained in the influent can be generated into nitrosation nitrogen and alkalinity through nitrosation reaction, the alkalinity can supplement alkalinity consumption during front end denitrification, meanwhile, organic matters in the influent are consumed under the action of activated sludge in the aerobic tank 40, the nitrosation liquid flowing back mainly contains nitrosation nitrogen at the moment, and after flowing back to the front anoxic tank 30, the denitrification reaction is fully carried out under the environment of sufficient carbon sources, and nitrogen is generated and discharged out of the system. Organic pollutant COD contained in the kitchen biogas slurry wastewater also carries out assimilation or dissimilation reaction in the aerobic tank 40, and the COD concentration is greatly reduced. Meanwhile, under the aerobic action, the phosphorus accumulating bacteria in the aerobic tank 40 absorb a large amount of phosphorus again and gather in the suspended sludge. The effluent of the aerobic tank 40 flows into the post-anoxic tank 50, and under an anoxic environment, nitrite bacteria carry out denitrification reaction on the residual nitrite nitrogen in the effluent, so that the residual nitrite nitrogen is fully eliminated. In order to ensure that the carbon source required by the denitrification reaction in the post-anoxic tank 50 is sufficient, sodium acetate or water can be added into the tank through a carbon source adding pipe 51, the water discharged from the post-anoxic tank 50 enters the membrane tank 60, the plate-type membrane assembly 64 adopts lateral aeration, an aeration device is not arranged at the bottom of the membrane tank 60, the suspended sludge gradually sinks under the action of gravity, and finally most of the suspended sludge is deposited at the bottom of the tank, and the upper part of the suspended sludge forms supernatant. The plate-type membrane module 64 is arranged in the supernatant in the upper part of the tank, and is connected to a water outlet pump 67 through a water outlet pipe 66 to pump the water out, so that the plate-type membrane module 64 operates intermittently in order to delay membrane pollution. When the plate-type membrane module 64 operates, the aeration discs 65 which are arranged in a staggered way with the plate-type membrane module 64 perform airflow scouring on the surface of the plate-type membrane module 64; when the plate-type membrane assembly 64 stops operating, the electromagnetic valve of the water outlet pipe 66 can be closed, the electromagnetic valve of the branch pipe 69 can be opened, and the plate-type membrane assembly 64 can be subjected to online back flushing to delay membrane pollution.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The utility model provides a meal kitchen natural pond liquid effluent treatment plant which characterized in that: the anaerobic pool comprises a pool body (10), wherein an anaerobic pool (20), a front anoxic pool (30), an aerobic pool (40), a rear anoxic pool (50) and a membrane pool (60) are arranged in the pool body (10), and the anaerobic pool (20), the front anoxic pool (30), the aerobic pool (40), the rear anoxic pool (50) and the membrane pool (60) are communicated in sequence; a sewage pipe (21) is communicated with one side of the anaerobic tank (20), first aeration components (80) for biogas aeration are fixedly arranged at the bottom parts of the anaerobic tank (20), the front anoxic tank (30) and the rear anoxic tank (50), and second aeration components (81) are fixedly arranged at the bottom part of the aerobic tank (40); the top end of the rear anoxic tank (50) is communicated with a carbon source feeding pipe (51), the bottom end of the aerobic tank (40) is communicated with a nitrosation liquid return pipe (41), one end of the nitrosation liquid return pipe (41) is communicated with the bottom end of the front anoxic tank (30), and a return pump (42) is arranged on the nitrosation liquid return pipe (41); the membrane pool (60) is internally provided with a plurality of plate-type membrane assemblies (64), the output ends of the plate-type membrane assemblies (64) are communicated with a water outlet pipe (66), one end of the water outlet pipe (66) penetrates out of the membrane pool (60), and a water outlet pump (67) is arranged on the pipe section of the water outlet pipe (66).
2. The kitchen biogas slurry wastewater treatment device according to claim 1, characterized in that: four partition plates (11) are fixedly arranged in the tank body (10), connecting ports (12) are formed in the partition plates (11), and the anaerobic tank (20), the front anoxic tank (30), the aerobic tank (40), the rear anoxic tank (50) and the membrane tank (60) are communicated through the corresponding connecting ports (12) in the partition plates (11); and filter screens (13) are fixedly arranged in the connecting ports (12).
3. The kitchen biogas slurry wastewater treatment device according to claim 1, characterized in that: the anaerobic tank is characterized in that the top end of the anaerobic tank (20) is communicated with a biogas collecting pipe (71), one end of the biogas collecting pipe (71) is communicated with a biogas collecting tank (72), the output end of the biogas collecting tank (72) is communicated with an aeration pump (73), the output end of the aeration pump (73) is communicated with a connecting main pipe (74), the connecting main pipe (74) is communicated with a plurality of connecting branch pipes (75), and one end of each connecting branch pipe (75) is respectively communicated with a first aeration assembly (80) in each tank.
4. The kitchen biogas slurry wastewater treatment device according to claim 1, characterized in that: the aeration tank is characterized in that a plurality of aeration disks (65) are arranged in the membrane tank (60), the aeration disks (65) and the plate-type membrane modules (64) are arranged at intervals in a staggered mode, an air pump (68) is arranged outside the tank body (10), the output end of the air pump (68) is communicated with a plurality of branch pipes (69), and the air pump (68) is communicated with a water outlet pipe (66), a second aeration module (81) and the aeration disks (65) through the branch pipes (69).
5. The kitchen biogas slurry wastewater treatment device according to claim 1, characterized in that: the anaerobic tank (20), the front anoxic tank (30) and the rear anoxic tank (50) are all internally provided with suspended fillers (82), and the aerobic tank (40) is internally provided with suspended fillers (83).
6. The kitchen biogas slurry wastewater treatment device according to claim 1, characterized in that: the bottom is fixed in membrane cisterna (60) and is provided with a dirt collecting hopper (61), the bottom of the dirt collecting hopper (61) is communicated with a sludge return pipe (62), one end of the sludge return pipe (62) is communicated with the bottom of the anaerobic cisterna (20), and a sludge pump (63) is arranged on the pipe section of the sludge return pipe (62).
7. The kitchen biogas slurry wastewater treatment device according to claim 1, characterized in that: one side of the anaerobic tank (20) close to the top is communicated with an oil discharge pipe (22), and a powdered activated carbon filler or a suspended filler (83) is arranged in the membrane tank (60).
8. The kitchen biogas slurry wastewater treatment device according to claim 1, characterized in that: n treatment units consisting of a front anoxic tank (30) and an aerobic tank (40) can be arranged between the anaerobic tank (20) and the rear anoxic tank (50).
9. The kitchen biogas slurry wastewater treatment process according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
s1: filling a treatment liquid rich in phosphorus-accumulating bacteria into the anaerobic tank (20), filling a nitrosation liquid into the front anoxic tank (30), filling a treatment liquid rich in nitrosation bacteria into the aerobic tank (40), and filling a treatment liquid containing a certain amount of denitrifying bacteria into the rear anoxic tank (50);
s2: introducing the kitchen biogas slurry wastewater into an anaerobic tank (20), performing biogas aeration on the kitchen biogas slurry wastewater by a first aeration component (80), wherein the aeration time is 0.5-1d, floating grease contained in the kitchen biogas slurry wastewater to the upper layer after aeration, discharging the grease out of the device through an oil discharge pipe (22), and then introducing the kitchen biogas slurry wastewater into a front anoxic tank (30);
s3: the kitchen biogas slurry wastewater enters a front anoxic tank (30), the kitchen biogas slurry wastewater is mixed with nitrosation liquid in the front anoxic tank (30), nitrogen is generated and discharged, the reaction time is 3-10d, and then the kitchen biogas slurry wastewater enters an aerobic tank (40);
s4: the kitchen biogas slurry wastewater enters an aerobic tank (40), the temperature in the aerobic tank (40) is controlled to be 30-35 ℃, the dissolved oxygen is 0.8-1.2mg/L, ammonia nitrogen contained in the kitchen biogas slurry wastewater generates nitrosation reaction under the action of nitrosation bacteria to generate nitrite nitrogen and alkalinity, the nitrite nitrogen and the alkalinity flow back to a front anoxic tank (30) along with the nitrosation liquid, and phosphorus contained in the kitchen biogas slurry wastewater is reabsorbed by phosphorus accumulating bacteria and is gathered in suspended sludge; the reaction time is 10-30d in the process, and then the kitchen biogas slurry wastewater enters a post-anoxic tank (50);
s5: enabling the kitchen biogas slurry wastewater to enter a rear anoxic tank (50), carrying out denitrification reaction on the residual nitrite nitrogen in the wastewater by denitrifying bacteria under an anoxic environment by using the residual organic matters in the wastewater as a carbon source to generate nitrogen, further removing the nitrite nitrogen and organic pollutants for 1h, and then introducing effluent into a membrane tank (60);
s6: the effluent enters a membrane tank (60), suspended sludge in the sewage is precipitated under the action of gravity, the sewage is layered, supernatant is on the upper layer, the sludge is gathered at the bottom of the tank, the supernatant is pumped out through a plate-type membrane assembly (64), and the sludge precipitated at the lower layer is returned to an anaerobic tank (20) through a sludge return pipe (62).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116462324A (en) * | 2023-04-25 | 2023-07-21 | 净化控股集团股份有限公司 | Integrated modularized sewage treatment device and sewage treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116462324A (en) * | 2023-04-25 | 2023-07-21 | 净化控股集团股份有限公司 | Integrated modularized sewage treatment device and sewage treatment method |
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Application publication date: 20220805 |