CN110563285B - Integrated biogas slurry wastewater treatment system and treatment process thereof - Google Patents
Integrated biogas slurry wastewater treatment system and treatment process thereof Download PDFInfo
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- CN110563285B CN110563285B CN201911009641.2A CN201911009641A CN110563285B CN 110563285 B CN110563285 B CN 110563285B CN 201911009641 A CN201911009641 A CN 201911009641A CN 110563285 B CN110563285 B CN 110563285B
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- 239000002002 slurry Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 26
- 238000010992 reflux Methods 0.000 claims abstract description 94
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 88
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 238000004062 sedimentation Methods 0.000 claims abstract description 60
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 44
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 41
- 230000009935 nitrosation Effects 0.000 claims abstract description 40
- 238000007034 nitrosation reaction Methods 0.000 claims abstract description 40
- 230000003647 oxidation Effects 0.000 claims abstract description 28
- 238000001556 precipitation Methods 0.000 claims abstract description 26
- 239000002351 wastewater Substances 0.000 claims abstract description 22
- 230000001112 coagulating effect Effects 0.000 claims abstract description 21
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 8
- 231100000719 pollutant Toxicity 0.000 claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 27
- 229910052799 carbon Inorganic materials 0.000 claims description 27
- 238000005273 aeration Methods 0.000 claims description 25
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 239000000945 filler Substances 0.000 claims description 11
- 230000001580 bacterial effect Effects 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 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 8
- 230000015271 coagulation Effects 0.000 claims description 7
- 238000005345 coagulation Methods 0.000 claims description 7
- 239000000523 sample Substances 0.000 claims description 7
- 239000008399 tap water Substances 0.000 claims description 7
- 235000020679 tap water Nutrition 0.000 claims description 7
- 241001453382 Nitrosomonadales Species 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 239000000701 coagulant Substances 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 238000005276 aerator Methods 0.000 claims description 5
- 230000005764 inhibitory process Effects 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 claims description 3
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 239000003112 inhibitor Substances 0.000 claims description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 235000017281 sodium acetate Nutrition 0.000 claims description 2
- 239000001632 sodium acetate Substances 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 238000010790 dilution Methods 0.000 claims 1
- 239000012895 dilution Substances 0.000 claims 1
- 239000003814 drug Substances 0.000 claims 1
- 239000000243 solution Substances 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 3
- XUHVCHNJCBBXMP-UHFFFAOYSA-M sodium;10-[(2-hydroxybenzoyl)amino]decanoate Chemical group [Na+].OC1=CC=CC=C1C(=O)NCCCCCCCCCC([O-])=O XUHVCHNJCBBXMP-UHFFFAOYSA-M 0.000 description 38
- 238000006243 chemical reaction Methods 0.000 description 26
- 241000894006 Bacteria Species 0.000 description 11
- 239000012528 membrane Substances 0.000 description 4
- 230000001546 nitrifying effect Effects 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 238000005842 biochemical reaction Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 241000203069 Archaea Species 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000463 material Substances 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
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- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
-
- 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
- C02F2209/22—O2
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
-
- 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
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
-
- 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
- C02F3/308—Biological phosphorus removal
Landscapes
- 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)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention belongs to the technical field of water treatment and biogas slurry wastewater treatment, and discloses an integrated biogas slurry wastewater treatment system. Comprises a coagulating sedimentation unit, a short-cut nitrification and denitrification anaerobic ammonia oxidation unit, a sedimentation reflux unit, a buffer adjusting unit, a denitrification unit, a nitrosation unit and a secondary sedimentation reflux unit which are connected in sequence; the precipitation reflux unit and the short-cut nitrification and denitrification anaerobic ammonia oxidation unit form a reflux branch, and the secondary precipitation reflux unit and the denitrification unit form a reflux branch. According to the integrated biogas slurry wastewater treatment system in the form of the container, the problem that a factory which generates small water amount of biogas slurry everywhere can be flexibly solved along with a truck is solved, a large-scale biogas slurry treatment facility is not required to be built, the occupied area of the environmental protection facility is reduced, and the environmental protection construction cost is saved. The treatment system and the treatment process can solve the problem of pollutant treatment of biogas slurry and similar wastewater.
Description
Technical Field
The invention belongs to the technical field of water treatment and biogas slurry wastewater treatment, and relates to an integrated biogas slurry wastewater treatment system and a treatment process thereof.
Background
The biogas slurry wastewater has the water quality characteristics of high nitrogen and low carbon. Particularly where high free ammonia inhibits conventional biological treatment processes, the treatment by membrane methods is costly and does not completely address the problem of contaminants. Many biogas slurry plants that produce small amounts of water are scattered, centralize the pipe network and build the complete set of sewage treatment facilities, which is economically unacceptable to the small plants.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an integrated biogas slurry wastewater treatment system and a treatment process thereof. According to the integrated biogas slurry wastewater treatment system in the form of the container, the problem that a factory which generates small water amount of biogas slurry everywhere can be flexibly solved along with a truck is solved, a large-scale biogas slurry treatment facility is not required to be built, the occupied area of the environmental protection facility is reduced, and the environmental protection construction cost is saved. The treatment system and the treatment process can solve the problem of pollutant treatment of biogas slurry and similar wastewater.
The above object of the present invention is achieved by the following technical solutions:
an integrated biogas slurry wastewater treatment system: comprises a coagulating sedimentation unit, a short-cut nitrification and denitrification anaerobic ammonia oxidation unit (SNAD unit), a sedimentation reflux unit, a buffer adjustment unit, a denitrification unit, a nitrosation unit and a secondary sedimentation reflux unit which are connected in sequence; the precipitation reflux unit and the short-cut nitrification and denitrification anaerobic ammonia oxidation unit form a reflux branch, and the secondary precipitation reflux unit and the denitrification unit form a reflux branch; an operation room is arranged in the biogas slurry treatment system, and an aeration fan, a triplet tank, a coagulation dispensing tank and a carbon source storage tank are sequentially arranged at the bottom of the operation room; the aeration fan is connected with a fan pipeline and is connected with the SNAD reaction tank, the fan pipeline in the SNAD reaction tank is connected with an aeration device in the SNAD reaction tank, a water inlet lift pump and an on-line instrument detection group are arranged in an operation room, and a probe of the on-line instrument detection group is connected with the inside of the SNAD reaction tank; a stirrer B and a filter screen are also arranged in the SNAD reaction tank; the sedimentation reflux unit is internally provided with a sedimentation reflux tank A and an electric control room which are sequentially connected; an overflow weir is arranged in the sedimentation reflux tank A; the bottom of the electric control room is provided with a circulating pump, a reflux pump, an electric control cabinet and an aeration fan which are connected in sequence; an aeration fan pipeline in the electric control room is connected to an aeration device of the nitrosation tank, a circulating pump in the electric control room is connected with the upper end and the lower end of the sedimentation reflux tank A, and a reflux pump in the electric control room is connected with the lower end of the sedimentation reflux tank A and the upper end of the SNAD reaction tank; a wire instrument detection group is arranged in the electric control room, and a probe of the wire instrument detection group is connected into the nitrosation tank; the buffer adjusting unit is provided with a buffer adjusting groove, the buffer adjusting groove is provided with a stirrer, a tap water hose is connected in the buffer adjusting groove, and the side wall of the buffer adjusting groove is provided with a guide plate; the denitrification unit is provided with a denitrification groove, the denitrification groove is provided with a stirrer, and the side wall of the denitrification groove is provided with a guide plate; the side wall of the nitrosation tank is provided with a guide plate; the secondary sedimentation reflux unit is internally provided with a sedimentation reflux groove B and equipment room which are sequentially connected; an overflow weir is arranged in the sedimentation reflux tank B; the bottom of the equipment room is provided with a circulating pump and a reflux pump which are sequentially connected, the circulating pump in the equipment room is connected with the upper end and the lower end of the sedimentation groove B, and the reflux pump is connected with the lower end of the sedimentation groove B and the upper end of the denitrification groove.
The inside of the triplet tank is provided with a dephosphorization tank, a precipitation tank and a water collecting tank which are connected in sequence, and the triplet tank is made of steel; the front end inside the triplet tank is provided with a stirrer A and a biogas slurry wastewater inlet end.
The online instrument detection group comprises an ammonia nitrogen online instrument, a pH online instrument and a dissolved oxygen online instrument, wherein the instruments are connected with each other. The on-line instrument detection group of the operation room is used for monitoring the water quality state of the SNAD reaction tank. The on-line instrument detection group in the electric control room is used for monitoring the water quality state in the nitrosation tank.
The front end of the triplet groove is provided with a stirrer, the coagulation dispensing groove is provided with a stirrer, a liquid level meter and a dosing metering pump, and the dosing metering pump is connected with the coagulation dispensing groove and the front end first groove body in the triplet groove through a hard polyvinyl chloride (UPVC) pipeline. The carbon source storage tank is provided with a stirrer, a liquid level meter and a metering pump, and the metering pump arranged in the carbon source storage tank is connected with the buffer regulating tank. The water inlet lifting pump is connected with the end tank body of the triplet tank and the SNAD reaction tank.
The SNAD reaction tank is arranged in a short-cut nitrification and denitrification anaerobic ammonia oxidation unit and is totally called as a short-cut nitrification and denitrification anaerobic ammonia oxidation reaction tank. The nitrosation tank is arranged in the nitrosation unit.
Further, the fan pipeline is connected with the SNAD reaction tank through a flange.
Further, the operation room, the SNAD reaction tank, the precipitation reflux tank A, the electric control room, the buffer regulating tank, the denitrification tank, the nitrosation tank, the precipitation reflux tank B and the equipment are separated by stainless steel plates. The stainless steel plate can be SUS304.
Further, the overflow weir is a triangular overflow weir.
Further, 2 aeration fans are arranged in the operation room.
The integrated biogas slurry wastewater treatment system comprises the steps that biogas slurry inflow firstly enters a steel triplet tank, then enters an SNAD reaction tank through a water inflow lifting pump, the biogas slurry passes through a filtering screen after reacting in the SNAD reaction tank, the biogas slurry enters a precipitation reflux tank A, and filler in the SNAD reaction tank is trapped by the screen. Biogas slurry in the reflux precipitation tank A automatically flows to a buffer regulating tank through an overflow weir, the buffer regulating tank automatically flows to a denitrification tank, a nitrosation tank and a reflux precipitation tank B sequentially after buffer regulation, and finally effluent is discharged through the overflow weir of the reflux precipitation tank B.
The treatment process of the integrated biogas slurry wastewater treatment system; the specific treatment process comprises the following steps:
s1, enabling biogas slurry wastewater to enter a coagulating sedimentation unit by a pump, and mainly removing suspended matters in the biogas slurry wastewater and phosphorus with an inhibition effect on anaerobic ammonia oxidizing bacteria through the coagulating sedimentation unit;
s2, pumping the biogas slurry wastewater subjected to coagulating sedimentation into a short-cut nitrification and denitrification anaerobic ammonia oxidation unit through a water inlet lifting pump; the process parameters of the short-cut nitrification and denitrification anaerobic ammonia oxidation process unit are controlled at the temperature of 30-38 ℃ and the dissolved oxygen is 0.2-0.5mg/L; the short-cut nitrification and denitrification anaerobic ammonia oxidation unit is internally stirred by adopting a mechanical stirrer with the rotating speed of 60-90r/min, and a fluidized bed filler with the particle size of 1-2cm is arranged in the short-cut nitrification and denitrification anaerobic ammonia oxidation unit; for removing total nitrogen and carbon-containing organics;
s3, discharging water from the SNAD unit into a precipitation and reflux unit, wherein the reflux ratio is 200%, the precipitation and reflux unit intercepts bacterial and dilutes the pollutant load of the water inlet of the SNAD unit, the supernatant enters a buffer adjusting unit, a tap water inlet pipe of a buffer tank is opened through feedback of an ammonia nitrogen on-line instrument and an electromagnetic valve, the water quality is adjusted in time through clear water, and the electromagnetic valve is closed after the inhibition is released;
s4, the total nitrogen and the carbon-containing organic matters cannot be further degraded by the SNAD unit alone, so that the total nitrogen and the carbon-containing organic matters are further removed by the denitrification unit and the nitrosation unit, the nitrosation unit can degrade the excessive carbon source and further reduce the ammonia nitrogen concentration, and 200% of nitrite nitrogen flows back to denitrification to form nitrogen removal.
Furthermore, the coagulant adopted by the coagulating sedimentation unit in the step S1 is an industrial ferric trichloride solution with the mass concentration of 30-40%, and the adding proportion is 30-40 times of the mass concentration of the total phosphorus in the biogas slurry wastewater.
Furthermore, the step S1 is specifically that biogas slurry wastewater enters a coagulating sedimentation water collection triplet tank of a biogas slurry operation room through a pump, a stirrer with the rotating speed of 200r/min is arranged on the coagulating tank, a water inlet pump and a coagulant dosing metering pump are started in a linkage manner while water is fed, dosing and suspended matter removal and phosphorus removal are carried out, supernatant is collected in the water collection tank, the starting and the stopping of a water inlet lifting pump are controlled through the liquid level, and the biogas slurry is input into a short-distance nitrification and denitrification anaerobic ammonia oxidation unit.
Further, in the step S2, the filler is hung with a bacterial film of compound nitrosation, denitrification and anaerobic ammoxidation, and the bacterial concentration is about 5-6kg/m 3 The filling proportion is 25% -35%.
Furthermore, in the step S3, the buffer adjusting unit is a processing unit for preventing the quality of the incoming water from fluctuating greatly and generating the inhibitor impact downstream, and besides, the buffer adjusting unit is also used for providing a carbon source for the denitrification unit of the later stage.
Further, in the step S4, the denitrification unit is added by the buffer adjusting unit through supplementing sodium acetate as a carbon source according to the mass concentration of 1:4-5 of the carbon-nitrogen ratio; the denitrification unit is in an anaerobic environment, a mechanical stirrer is arranged in the denitrification unit for stirring, a microporous aerator is arranged in the denitrification unit, and the dissolved oxygen is controlled at 2-4mg/L.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention provides an integrated biogas slurry wastewater treatment system and a treatment process thereof; can treat 1-1.5m biogas slurry 3 And/d, the total nitrogen concentration of the treated biogas slurry is 1600mg/L, and the final effluent can reach the discharge standard of urban sewer water quality.
(2) The invention provides an integrated biogas slurry wastewater treatment system and a treatment process thereof; in the short-cut nitrification and denitrification anaerobic ammonia oxidation unit: the nitrifying bacteria group and the anaerobic ammonia oxidizing bacteria group belong to autotrophic bacteria, the nitrifying bacteria group utilizes oxygen in water to carry out biochemical reaction with ammonia nitrogen, ammonia nitrogen can be converted into nitrite nitrogen which can be utilized by the anaerobic ammonia oxidizing bacteria, molecular oxygen is used as an electron donor in the conversion process, and ammonia nitrogen is an electron acceptor. The anaerobic ammonia oxidizing bacteria utilize nitrite nitrogen and ammonia nitrogen in sewage to generate nitrogen through biochemical reaction and discharge the nitrogen to water, and the ammonia nitrogen is an electron donor and the nitrite nitrogen is an electron acceptor in the reaction process. The theoretical removal rate of total nitrogen in the whole process can reach 89%, and the total nitrogen removal rate is increased by the composite short-range nitrifying bacteria and denitrifying bacteria, so that the total nitrogen removal rate is about 80% and the carbon-containing organic matter removal rate is about 20% under normal working conditions.
(3) The technical scheme of the invention solves the treatment problem of biogas slurry and similar wastewater generated by small factories, has small occupied area, flexibility and strong applicability, and greatly reduces the environmental protection construction investment cost of each small factory.
(4) The technical scheme of the invention solves the problem of treatment of small-volume biogas slurry wastewater, and the treatment system can solve the problem of high free ammonia biogas slurry wastewater which cannot be treated by the conventional biological treatment process method, and treat the biogas slurry wastewater everywhere in a flexible manner, thereby reducing the environmental protection floor area and the environmental protection investment cost. Can be applied to the treatment of biogas slurry sewage and water bodies with similar water quality.
Drawings
FIG. 1 is a block diagram of a biogas slurry wastewater treatment system according to the present invention.
Fig. 2 is a schematic structural diagram of fig. 1.
FIG. 3 is a process flow chart of the biogas slurry wastewater treatment system of the invention.
Fig. 4 is a schematic plan view of the internal partition distribution of example 1.
In the figure, 1 part of short-cut nitrification and denitrification anaerobic ammonia oxidation unit, 2 part of sedimentation reflux unit, 3 part of buffer regulation unit, 4 part of denitrification unit, 5 part of nitrosation unit, 6 part of secondary sedimentation reflux unit, 7 part of coagulation sedimentation unit, 8 part of aeration fan C,9 part of triplet tank, 10 part of stirrer A,11 part of metering pump, 12 part of liquid level meter, 13 part of dissolved oxygen on-line meter, 14 part of pH on-line meter, 15 part of ammonia nitrogen on-line meter, 16 part of coagulation dispensing tank, 17 part of carbon source storage tank, 18 part of water collecting tank end, 19 part of tap water hose, 20 part of biogas slurry waste water inlet end, 21 part of aerator, 22 part of stirrer B, the device comprises a filter screen, a overflow weir A, a circulating pump A, a reflux pump A, a circulating pump 27, an electric control cabinet, a guide plate, a precipitation reflux tank A, a water outlet pipe, a settling reflux tank A, a working chamber, a short-path nitrification and denitrification anaerobic ammonia oxidation reaction tank, a precipitation reflux tank A, a settling reflux tank 33, an electric control chamber, a buffer regulating tank, a denitrification tank, a nitrosation tank, a settling reflux tank B, a settling reflux tank 38, a device chamber, a 39, an aeration fan A, a 40, a stirrer C, a 41, a stirrer D, a 42, a circulating pump B, a 43, a reflux pump B, a 44, an overflow weir B, a 8-1 aeration fan B, a 10-1 stirrer E and a 10-2 stirrer F.
Detailed Description
The present invention is described in detail below by way of specific examples, but the scope of the present invention is not limited thereto. The experimental methods adopted by the invention are all conventional methods, and experimental equipment, materials, reagents, compound nitrosates, denitrifying bacteria, anaerobic ammonia oxidizing bacteria and the like can be obtained from commercial sources.
Example 1
An integrated biogas slurry wastewater treatment system; the device outline dimension of the system: 6.4mX2.1mX2.5m (length, width and height), the main body adopts SUS304 stainless steel structure, and the internal partition distribution is shown in fig. 1 and 4. The system comprises a coagulating sedimentation unit 7, a short-cut nitrification and denitrification anaerobic ammonia oxidation unit 1, a sedimentation reflux unit 2, a buffer adjustment unit 3, a denitrification unit 4, a nitrosation unit 5 and a secondary sedimentation reflux unit 6 which are connected in sequence; the precipitation reflux unit 2 and the short-cut nitrification and denitrification anaerobic ammonia oxidation unit 1 form a reflux branch, and the secondary precipitation reflux unit 6 and the denitrification unit 4 form a reflux branch; an operation room 30 is arranged in the coagulating sedimentation unit 1, and an aeration fan C8, an aeration fan B8-1, a triplet groove 9, a coagulating and dispensing groove 16 and a carbon source storage tank 17 are sequentially arranged at the bottom of the operation room 30; the aeration fan is connected with a fan pipeline and is connected with the SNAD reaction tank 31, the fan pipeline in the SNAD reaction tank 31 is connected with an aeration device in the SNAD reaction tank 31, the operation room 30 is provided with a water inlet lift pump and an on-line instrument detection group, and a probe of the on-line instrument detection group is connected with the inside of the SNAD reaction tank 31; the SNAD reaction tank 31 is internally provided with a stirrer B22 and a filter screen 23; the sedimentation reflux unit 2 is internally provided with a sedimentation reflux groove A32 and an electric control room 33 which are sequentially connected; an overflow weir A24 is arranged in the sedimentation reflux groove A32; the bottom of the electric control room 33 is provided with a circulating pump A25, a reflux pump A26, an electric control cabinet 27 and an aeration fan A39 which are connected in sequence; an aeration fan A39 in the electric control room 33 is connected with an aeration device of the nitrosation tank 36 through a fan pipeline, a circulating pump A25 in the electric control room 33 is connected with the upper end and the lower end of a sedimentation reflux tank A32, and a reflux pump A26 in the electric control room 33 is connected with the lower end of the sedimentation reflux tank A32 and the upper end of the SNAD reaction tank 31; a linear instrument detection group is arranged in the electric control room 33, and a probe of the linear instrument detection group is connected into the nitrosation tank 36; the buffer adjusting unit 3 is provided with a buffer adjusting groove 34, the buffer adjusting groove 34 is provided with a stirrer C40, a tap water hose is connected in an inscription manner, and the side wall of the buffer adjusting groove is provided with a guide plate; the denitrification unit 4 is provided with a denitrification groove 35, the denitrification groove 35 is provided with a stirrer D41, and the side wall is provided with a guide plate; the side wall of the nitrosation tank 36 is provided with a guide plate; the secondary sedimentation reflux unit 6 is internally provided with a sedimentation reflux groove B37 and an equipment room 38 which are sequentially connected; an overflow weir is arranged in the sedimentation reflux groove B37; the bottom of the equipment room 38 is provided with a circulating pump B42 and a reflux pump B43 which are sequentially connected, the circulating pump B42 in the equipment room 38 is connected with the upper end and the lower end of a sedimentation reflux tank B37, and the reflux pump B43 is connected with the lower end of the sedimentation tank B37 and the upper end of a denitrification tank 35.
The inside of the triplet groove 9 is provided with a dephosphorization groove, a precipitation groove and a water collecting groove which are sequentially connected, and the triplet groove 9 is made of steel; the front end inside the triplet groove 9 is provided with a stirrer A10 and a biogas slurry wastewater inlet end 20.
The online instrument detection group comprises an ammonia nitrogen online instrument 15, a pH online instrument 14 and a dissolved oxygen online instrument 13, which are connected with each other. The on-line meter detection group of the operation room 30 is used for monitoring the water quality state of the SNAD reaction tank 31. The on-line meter detection group in the electric control room 33 is used for monitoring the water quality state in the nitrosation tank 36.
The front end of the triplet groove 9 is provided with a stirrer E10-1, the aggregate dispensing groove 16 is provided with a stirrer F10-2, a liquid level meter 12 and a dosing meter, and the dosing metering pump is connected with the aggregate dispensing groove 16 and the front end first groove body in the triplet groove 9 through a UPVC pipeline. The carbon source storage tank 17 is provided with a stirrer, a liquid level meter and a metering pump, and the metering pump arranged on the carbon source storage tank 17 is connected with the buffer regulating tank 34. The water inlet lift pump is connected with the end tank body of the triplet tank 9 and the SNAD reaction tank 31.
The SNAD reaction tank 31 is disposed in the short-cut nitrification and denitrification anaerobic ammonia oxidation unit 1, and the SNAD reaction tank 31 is referred to as a short-cut nitrification and denitrification anaerobic ammonia oxidation reaction tank 31. The nitrosation tank 36 is provided in the nitrosation unit 5.
The integrated biogas slurry wastewater treatment system comprises the following specific treatment process steps:
s1, biogas slurry wastewater enters a coagulating sedimentation water collection triplet groove 9 of a biogas slurry operation room by a pump, a stirrer with the rotating speed of 200r/min is arranged on a coagulating agent dispensing groove 16, a water inlet pump and a coagulant dosing metering pump are started in a linkage manner while water is fed, dosing and suspended matter removal and dephosphorization are carried out, supernatant is collected in the water collection groove, and the starting and stopping of a water inlet lifting pump are controlled by liquid level, so that the biogas slurry is input into a short-distance nitrification and denitrification anaerobic ammonia oxidation unit 1 (SNAD unit for short).
S2, the hydraulic retention time of the SNAD unit 1 is 4-4.5 days, a membrane type microporous aerator is arranged in the SNAD unit 1, dissolved oxygen is controlled to be 0.2mg/L, a fluidized bed filler with a filling rate of 25% is arranged in the SNAD unit, bacterial membranes of composite nitrosations, denitrifying bacteria and anaerobic ammoxidation bacteria are grown in the filler, pollutants in water are fully mixed with the filler by the fluidized bed filler under the stirring of a stirrer, and the pollutants are degraded under the action of microorganisms. The compound bacteria belong to archaea, can endure extremely high ammonia nitrogen environment, and are the capability which other nitrifying bacteria and other biological methods do not have. The SNAD unit 1 is internally provided with an ammonia nitrogen on-line instrument 15, a dissolved oxygen on-line instrument 13 and a pH on-line instrument 14, the probe monitors the water quality, the water quality is provided with two ammonia nitrogen warning lines, when pollutants break through the low warning line, the concentration of the dissolved oxygen is controlled by the linkage of the ammonia nitrogen on-line instrument 15 and an aeration fan, and the concentration of the dissolved oxygen can adjust the proportion of ammonia nitrogen and nitrite nitrogen of the SNAD unit 1. When ammonia nitrogen breaks through a high warning line, the equipment stops water inflow, a tap water inlet pipe of the buffer regulating groove 34 is opened through feedback of the ammonia nitrogen on-line instrument 15 and the electromagnetic valve, water quality is timely regulated through clear water, and the electromagnetic valve is closed after inhibition is released; the ammonia nitrogen on-line instrument 15 continues the fan linkage control of the biochemical reaction proportion until the alarm is released. The outlet of the SNAD unit 1 is provided with a filler screen, the screen has a larger surface area, and the filler can be prevented from accumulating on the screen and simultaneously is trapped and enters the precipitation and reflux unit 2.
S3, enabling biogas slurry of the SNAD unit 1 to automatically flow into the precipitation and reflux unit 2, enabling the precipitation and reflux unit 2 to intercept strains and return to the short-cut nitrification and denitrification anaerobic ammonia oxidation unit 1 in a reflux mode, and enabling the SNAD unit 1 to have strong load impact resistance through 200% reflux. The sedimentation reflux unit 2 is provided with a circulating pump and a reflux pump, the circulating pump enables the bottom of the sedimentation reflux groove A32 to have fluidity, and the bacteria mud is prevented from accumulating to form a dead zone. The reflux pump returns the mixed bacterial sludge to the SNAD unit 1.
The buffer adjusting tank 34 is used for adjusting water quality, when the water inlet pump is started, the carbon source dosing pump is started simultaneously, and the supplementary carbon source is used for denitrification of the rear section.
S4, the hydraulic retention time of the denitrification unit 4 and the nitrosation unit 5 is 2-3 days, the denitrification unit 4 and the nitrosation unit 5 are used for further degrading carbon-containing organic matters and total nitrogen, and a stirrer with the rotating speed of 60-90r/min is arranged in the denitrification unit 4 and is used for fully mixing and preventing bacterial flocs from being scattered. The bottom of the nitrosation unit 5 is provided with a membrane microporous aerator, dissolved oxygen is controlled at 2mg/L, nitrosations are arranged in the nitrosation unit 5 to form suspended sludge, the concentration of bacterial sludge is 4000-5000mg/L, the bacterial sludge has higher tolerance to free ammonia than conventional nitrosations, nitrite nitrogen is formed under the action of molecular oxygen, and the nitrite nitrogen is refluxed to the nitrosation unit through a circulating pump and a reflux pump to form nitrogen removal.
The removal rates of the units are shown in the following table 1:
table 1 removal rate table for each unit
The table data show that the biogas slurry treatment system provided by the invention can have very high removal rate for total nitrogen pollutants under the conditions of high ammonia nitrogen and low concentration chemical oxygen demand, and is very suitable for wastewater treatment with low carbon nitrogen ratio.
Comparison of different system treatment processes with the technical solutions of the present application is shown in table 2 below:
table 2 comparison of different system treatment processes with the technical solutions of the present application
The above-described embodiments are only preferred embodiments of the invention, and not all embodiments of the invention are possible. Any obvious modifications thereof, which would be apparent to those skilled in the art without departing from the principles and spirit of the present invention, should be considered to be included within the scope of the appended claims.
Claims (6)
1. The integrated treatment process of the biogas slurry wastewater treatment system is characterized in that the integrated treatment process adopts an integrated biogas slurry wastewater treatment system which comprises a coagulating sedimentation unit (7), a short-cut nitrification denitrification anaerobic ammonia oxidation unit (1), a sedimentation reflux unit (2), a buffer adjustment unit (3), a denitrification unit (4), a nitrosation unit (5) and a secondary sedimentation reflux unit (6) which are connected in sequence; the precipitation reflux unit (2) and the short-cut nitrification and denitrification anaerobic ammonia oxidation unit (1) form a reflux branch, and the secondary precipitation reflux unit (6) and the denitrification unit (4) form a reflux branch; an operation room (30) is arranged in the coagulating sedimentation unit (7), and an aeration fan, a triplet groove (9), a coagulating medicine dispensing groove (16) and a carbon source storage groove (17) are sequentially arranged at the bottom of the operation room (30); the aeration fan is connected with a fan pipeline and is connected with a short-cut nitrification and denitrification anaerobic ammonia oxidation reaction tank (31), the fan pipeline in the short-cut nitrification and denitrification anaerobic ammonia oxidation reaction tank (31) is connected with an aeration device in the aeration fan, and a sedimentation reflux unit (2) is internally provided with a sedimentation reflux tank A (32) and an electric control room (33) which are sequentially connected; an overflow weir is arranged in the sedimentation reflux groove A (32); the bottom of the electric control room (33) is provided with a circulating pump A (25), a reflux pump A (26), an electric control cabinet (27) and an aeration fan A (39) which are connected in sequence; an aeration fan A (39) in the electric control room (33) is connected with an aeration device of the nitrosation tank (36) through a fan pipeline, a circulating pump A (25) in the electric control room (33) is connected with the upper end and the lower end of a sedimentation reflux tank A (32), and a reflux pump A (26) in the electric control room (33) is connected with the lower end of the sedimentation reflux tank A (32) and the upper end of a short-cut nitrification and denitrification anaerobic ammonia oxidation reaction tank (31); the inside of the secondary sedimentation reflux unit (6) is provided with a sedimentation reflux groove B (37) and an equipment room (38) which are sequentially connected; an overflow weir is arranged in the sedimentation reflux groove B (37); the bottom of the equipment room (38) is provided with a circulating pump B (42) and a reflux pump B (43) which are sequentially connected, the circulating pump B (42) in the equipment room (38) is connected with the upper end and the lower end of a sedimentation reflux tank B (37), and the reflux pump B (43) is connected with the lower end of the sedimentation tank B (37) and the upper end of a denitrification tank (35);
the operation room (30) is provided with a water inlet lifting pump and an on-line instrument detection group, and a probe of the on-line instrument detection group is connected with the inside of the short-cut nitrification denitrification anaerobic ammonia oxidation reaction tank (31); a stirrer B (22) and a filter screen (23) are also arranged in the short-cut nitrification and denitrification anaerobic ammonia oxidation reaction tank (31); a wire instrument detection group is arranged in the electric control room (33), and a probe of the wire instrument detection group is connected into the nitrosation tank (36); the buffer adjusting unit (3) is provided with a buffer adjusting groove (34), the buffer adjusting groove (34) is provided with a stirrer C (40), a tap water hose is connected in the buffer adjusting groove, and the side wall of the buffer adjusting groove is provided with a guide plate; the denitrification unit (4) is provided with a denitrification groove (35), the denitrification groove (35) is provided with a stirrer D (41), and the side wall is provided with a guide plate; a deflector is arranged on the side wall of the nitrosation tank (36);
the inside of the triplet groove (9) is provided with a dephosphorization groove, a precipitation groove and a water collecting groove which are sequentially connected, and the triplet groove (9) is made of steel; the front end in the triplet groove (9) is provided with a stirrer A (10) and a biogas slurry wastewater inlet end (20);
the online instrument detection group comprises an ammonia nitrogen online instrument (15), a pH online instrument (14) and a dissolved oxygen online instrument (13), wherein the instruments are connected with each other; the online instrument detection group of the operation room (30) is used for monitoring the water quality state of the shortcut nitrification and denitrification anaerobic ammonia oxidation reaction tank (31); the online instrument detection group in the electric control room (33) is used for monitoring the water quality state in the nitrosation tank (36);
the front end of the triplet groove (9) is provided with a stirrer E (10-1), the coagulation and dispensing groove (16) is provided with a stirrer F (10-2), a liquid level meter (12) and a dosing meter, and the dosing metering pump is connected with the coagulation and dispensing groove (16) and the front end first groove body in the triplet groove (9) through a UPVC pipeline; the carbon source storage tank (17) is provided with a stirrer, a liquid level meter and a metering pump, the metering pump arranged on the carbon source storage tank (17) is connected with the buffer regulating tank (34), and the water inlet lifting pump is connected with the tank body at the tail end of the triplet tank (9) and the short-cut nitrification and denitrification anaerobic ammonia oxidation reaction tank (31);
the short-cut nitrification and denitrification anaerobic ammonia oxidation reaction tank (31) is arranged in the short-cut nitrification and denitrification anaerobic ammonia oxidation unit (1), and the short-cut nitrification and denitrification anaerobic ammonia oxidation reaction tank (31) is totally called as a short-cut nitrification and denitrification anaerobic ammonia oxidation reaction tank (31); the nitrosation tank (36) is arranged in the nitrosation unit (5);
the method comprises the following specific steps:
s1, enabling biogas slurry wastewater to enter a coagulating sedimentation unit (7) by a pump, and mainly removing suspended matters in the biogas slurry wastewater and phosphorus with an inhibition effect on anaerobic ammonia oxidizing bacteria by the coagulating sedimentation unit (7);
s2, pumping the biogas slurry wastewater subjected to coagulating sedimentation into a shortcut nitrification and denitrification anaerobic ammonia oxidation unit (1) through a water inlet lifting pump; the technological parameters of the short-cut nitrification and denitrification anaerobic ammonia oxidation unit (1) are controlled at the temperature of 30-38 ℃ and the dissolved oxygen is 0.2-0.5mg/L; the short-cut nitrification and denitrification anaerobic ammonia oxidation unit (1) is stirred by adopting a mechanical stirrer with the rotating speed of 60-90r/min, and a fluidized bed filler with the particle size of 1-2cm is arranged in the short-cut nitrification and denitrification anaerobic ammonia oxidation unit (1); for removing total nitrogen and carbon-containing organics;
s3, enabling the effluent of the short-cut nitrification and denitrification anaerobic ammonia oxidation unit (1) to enter a precipitation reflux unit (2), wherein the reflux ratio is 200%, intercepting strains of the precipitation reflux unit (2) and pollutant loads of the water inlet of the dilution short-cut nitrification and denitrification anaerobic ammonia oxidation unit (1), enabling supernatant to enter a buffer regulation unit (3), enabling a tap water inlet pipe of a buffer regulation groove (34) to be fed back through an ammonia nitrogen on-line instrument (15) and an electromagnetic valve, timely regulating water quality through clear water, and closing the electromagnetic valve after inhibition is released;
s4, the total nitrogen and the carbon-containing organic matters cannot be further degraded by the short-cut nitrification and denitrification anaerobic ammonia oxidation unit (1), so that the total nitrogen and the carbon-containing organic matters are further removed by the denitrification unit (4) and the nitrosation unit (5), the nitrosation unit (5) can degrade an excessive carbon source and further reduce ammonia nitrogen concentration, and 200% of nitrite nitrogen flows back to denitrification to form nitrogen removal.
2. The integrated treatment process of the biogas slurry wastewater treatment system according to claim 1, wherein the coagulant adopted by the coagulating sedimentation unit (7) in the step S1 is an industrial ferric trichloride solution with the mass concentration of 30% -40%, and the adding proportion is 30-40 times of the total phosphorus mass concentration in the biogas slurry wastewater.
3. The treatment process of the integrated biogas slurry wastewater treatment system according to claim 2, wherein the step S1 is specifically characterized in that biogas slurry wastewater enters a coagulating sedimentation water collection triplet tank (9) of a biogas slurry operation room through a pump, a stirrer with the rotating speed of 200r/min is arranged on the coagulating tank, a water inlet pump and a coagulant dosing metering pump are started in a linkage manner while water is fed, dosing and suspended matter removal and phosphorus removal are carried out, supernatant is collected in the water collection tank, and the starting and stopping of the water inlet lifting pump are controlled through a liquid level, so that the biogas slurry is input into the short-range nitrification and denitrification anaerobic ammonia oxidation unit (1).
4. The treatment process of the integrated biogas slurry wastewater treatment system according to claim 3, wherein the filler in the step S2 is hung with a bacterial film of composite nitrosation, denitrification and anaerobic ammoxidation, the bacterial concentration is about 5-6kg/m, and the filling proportion is 25% -35%.
5. The integrated biogas slurry wastewater treatment system treatment process according to claim 4, wherein the buffer adjusting unit (3) in the step S3 is a treatment unit for preventing the inflow water quality from fluctuating greatly and generating inhibitor impact downstream, and the buffer adjusting unit (3) is further used for providing a carbon source for the denitrification unit (4) in the subsequent stage.
6. The treatment process of the integrated biogas slurry wastewater treatment system according to claim 5, wherein in the step S4, the denitrification unit (4) is added by a buffer adjusting unit (3) through supplementing sodium acetate as a carbon source according to the mass concentration of 1:4-5 of the carbon-nitrogen ratio; the denitrification unit (4) is in an anaerobic environment, a mechanical stirrer is arranged in the denitrification unit (5) for stirring, a microporous aerator is arranged in the denitrification unit, and the dissolved oxygen is controlled at 2-4mg/L.
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