GB2574621A - Integrated treatment technology device for swine wastewater - Google Patents
Integrated treatment technology device for swine wastewater Download PDFInfo
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- GB2574621A GB2574621A GB1809651.1A GB201809651A GB2574621A GB 2574621 A GB2574621 A GB 2574621A GB 201809651 A GB201809651 A GB 201809651A GB 2574621 A GB2574621 A GB 2574621A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 46
- 238000005516 engineering process Methods 0.000 title claims description 30
- 239000010802 sludge Substances 0.000 claims abstract description 119
- 238000004062 sedimentation Methods 0.000 claims abstract description 49
- 239000012528 membrane Substances 0.000 claims abstract description 30
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- 238000010992 reflux Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 238000002360 preparation method Methods 0.000 claims abstract description 14
- 238000005273 aeration Methods 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 230000000813 microbial effect Effects 0.000 claims abstract description 12
- 238000005189 flocculation Methods 0.000 claims abstract description 5
- 230000016615 flocculation Effects 0.000 claims abstract description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 18
- 229910052698 phosphorus Inorganic materials 0.000 claims description 18
- 239000011574 phosphorus Substances 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 16
- 239000000945 filler Substances 0.000 claims description 15
- 239000004698 Polyethylene Substances 0.000 claims description 9
- -1 polyethylene Polymers 0.000 claims description 9
- 229920000573 polyethylene Polymers 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000012510 hollow fiber Substances 0.000 claims description 5
- 230000001954 sterilising effect Effects 0.000 claims description 5
- 238000004659 sterilization and disinfection Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 abstract 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 230000014759 maintenance of location Effects 0.000 description 11
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- 230000000694 effects Effects 0.000 description 7
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- 241000894006 Bacteria Species 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 239000006228 supernatant Substances 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000000855 fermentation Methods 0.000 description 3
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- 238000011049 filling Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
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- 229910052799 carbon Inorganic materials 0.000 description 2
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- 229920002401 polyacrylamide Polymers 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
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- YNJBWRMUSHSURL-UHFFFAOYSA-N trichloroacetic acid Chemical compound OC(=O)C(Cl)(Cl)Cl YNJBWRMUSHSURL-UHFFFAOYSA-N 0.000 description 1
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- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 description 1
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
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/545—Silicon compounds
-
- 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
- C02F2101/105—Phosphorus compounds
-
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
-
- 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
- C02F2203/004—Apparatus and plants for the biological treatment of water, waste water or sewage comprising a selector reactor for promoting floc-forming or other bacteria
-
- 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
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/101—Arranged-type packing, e.g. stacks, arrays
-
- 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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
- C02F3/1273—Submerged membrane bioreactors
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/348—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the way or the form in which the microorganisms are added or dosed
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
An integrated device for treating swine wastewater, includes a main reaction tank 5, a step-feed inflow system 1, a stirring and diversion system, an aeration and oxygen supply system 2, a sludge diversion system 3 and a nitrification liquid reflux system 4. The main reaction tank includes a pre-treatment section 501, a pre-anoxic section 502, an anaerobic section 503, an anoxic section 504, a primary sedimentation tank 505, an aerobic section 506, an intermediate sedimentation tank 507, a membrane tank 508, a sludge tank 509, and a clear water tank 510 that are sequentially connected. The wastewater is subjected to flocculation by a microbial preparation in the pre-treatment section. The sludge diversion system comprises first 31, second 32 and third 33 sludge diversion systems that divide the sludge in the primary sedimentation tank, in the intermediate sedimentation tank and in the sludge tank respectively into two parts. The primary diversion system refluxes sludge into the anaerobic section and discharges sludge into the sludge tank. The second diversion system refluxes sludge into the pre-anoxic section and discharges sludge into the sludge tank. The third diversion system refluxes the sludge into the aerobic section and discharges sludge into a sludge treatment system.
Description
INTEGRATED TREATMENT TECHNOLOGY DEVICE FOR SWINE WASTEWATER
TECHNICAL FIELD
The present invention relates to the technical field of sewage treatment, and in particular to an integrated treatment technology device for swine wastewater.
BACKGROUND
Scaled pig breeding brings good economic benefits, but the resultant swine wastewater also causes serious environmental pollution. Swine wastewater mainly includes swine urine, swine excrement, and swine pen washing water, which contains high concentrations of organic components, ammonia nitrogen, and phosphorus. Since the wastewater discharged from a scaled pig farm has a large amount and is concentrated, it certainly will cause serious damage to the ecological environment if discharged directly to the environment without treatment.
The treatment mode of swine wastewater can be summarized as: a landspreading mode, a natural treatment mode, and an engineering treatment mode. The landspreading mode and the natural treatment model require larger land area, which is an obstacle constraining most pig farms. Therefore, the engineering treatment technology is an ideal choice for the pig industry.
The combination of anaerobic and aerobic process is the most widely used engineering treatment technology for swine wastewater around the world. Although anaerobic treatment can convert the high concentration of organic matters in the swine wastewater into biogas energy, the concentration of pollutants in outlet from the anaerobic treatment is still very high, especially the removal of nitrogen and phosphorus is not obvious, and even not removed. Thus, the outlet still has a great pollution to the environment after discharging into the water body. Furthermore, after anaerobic treatment, the swine wastewater has a relatively poor biodegradability as well as a high concentration of ammonia nitrogen, which makes the effect of the current aerobic biological treatment technology be poor.
Therefore, it is a technical problem urgently to be solved by those of skills in the art how to design an integrated treatment technology device for swine wastewater with a small footprint and a good effect of nitrogen and phosphorus removal.
SUMMARY
An objective of the present invention is to provide an integrated treatment technology device for swine wastewater, so as to solve the technical problems existed in the prior art, reduce the footprint, and improve the effect of nitrogen and phosphorus removal.
To achieve the above purpose, the present invention provides the following solution.
The present invention discloses an integrated treatment technology device for swine wastewater, which includes a main reaction tank, a step-feed inflow system, a stirring and diversion system, an aeration and oxygen supply system, a sludge diversion system and a nitrification liquid reflux system. The main reaction tank includes a pretreatment section, and a pre-anoxic section, an anaerobic section, an anoxic section, a primary sedimentation tank, an aerobic section, an intermediate sedimentation tank, a membrane tank, a sludge tank, and a clear water tank that are sequentially connected to the pretreatment section.
The pretreatment section is dosed with a microbial preparation for conducting flocculation treatment; the step-feed inflow system is used for guiding the inflow of the pretreatment section into the pre-anoxic section and the anaerobic section respectively; the stirring and diversion system is used for stirring the swine wastewater in the anoxic section and the aerobic section and divert the entire flow process of the swine wastewater; the aeration and oxygen supply system is arranged at the aerobic section; and the nitrification liquid reflux system is used for refluxing the nitrification liquid in the intermediate sedimentation tank to the anoxic section;
The sludge diversion system includes a first sludge diversion system, a second sludge diversion system, and a third sludge diversion system. The first sludge diversion system divides the sludge in the primary sedimentation tank into two parts, one is refluxed into the anaerobic section and the other is discharged into the sludge tank; the second sludge diversion system divides the sludge in the intermediate sedimentation tank into two parts, one is refluxed into the pre-anoxic section and the other is discharged into the sludge tank; and the third sludge diversion system divides the sludge in the sludge tank into two parts, one is refluxed into the aerobic section and the other is discharged into a sludge treatment system.
Preferably, the membrane assembly in the membrane tank is a hollow fiber membrane, and the membrane tank is used for dosing a phosphorus removal agent.
Preferably, the aeration and oxygen supply system includes a gas source, a perforated tube, a gas flowmeter and a deflation valve. One end of the perforated tube is connected to the gas source, and the other end of the perforated tube extends into the aerobic section, and the gas flowmeter and the deflation valve are arranged on the perforated tube.
Preferably, the aerobic section includes an aerobic beginning section, an aerobic middle section, and an aerobic ending section that are sequentially communicated with each other, the aerobic beginning section and the aerobic ending section each having a cylindrical shape, and the aerobic middle section having a strip shape.
Preferably, the clear water tank is provided with a sterilizing trough therein, and the disinfection tank includes an ultraviolet disinfection lamp.
Preferably, the tank bottom of each of the intermediate sedimentation tank and the primary sedimentation tank is tapered.
Preferably, the anaerobic section includes two intercommunicated anaerobic baffled reactors. Each of the anaerobic baffled reactors includes a shell and a baffle disposed on the inner surface of the top of the shell. The baffle includes an upper vertical section and a lower inclined section, the inclined section being biased toward the outlet side of the anaerobic baffled reactor.
Preferably, the anaerobic baffle divides the anaerobic baffled reactor into two parts, i.e., an inlet side and an outlet side, and the width ratio of the inlet side and the outlet side is 1:2-1:3.
Preferably, the aerobic section is dosed with polyethylene suspended columnar carrier filler.
Preferably, the polyethylene suspended columnar carrier filler is a honeycomb hollow cylindrical structure, and the polyethylene suspended columnar carrier filler has a specific surface area of 650-850 m2/m3 and a bulk density of 80-100 kg/m3.
The present invention achieves the following technical effects compared to the prior art:
After subjected to a flocculation pretreatment by the microbial preparation, the wastewater is treated by a process using pre-anoxic + anaerobic + anoxic + aerobic as the main part, then is subjected to an advanced treatment via a membrane reactor, and thus the treated outlet is reused. The present invention effectively reduces the effect of nitrogen and phosphorus removal while reducing the footprint of the integrated processing technology device.
BRIEF DESCRIPTION OF THE DRAWINGS
To describe the technical solutions in the embodiments of the present invention or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present invention, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.
FIG. 1 is a processing flow chart of an integrated treatment technology device for swine wastewater of the present invention;
FIG. 2 is a schematic structural view of the integrated treatment technology device for swine wastewater of the present invention in a top-down direction;
FIG. 3 is a schematic structural view of an anaerobic section; and
FIG. 4 is a schematic diagram of a sludge return process in an intermediate sedimentation tank;
Illustration of reference numbers: 1. step-feed inflow system; 2. aeration and oxygen supply system; 3. sludge diversion system; 31. first sludge diversion system; 32. second sludge diversion system; 33. third sludge diversion system; 301. valve; 302. sludge return pump; 4. nitrification liquid reflux system; 5. main reaction tank; 501. pretreatment section; 502. pre-anoxic section; 503. anaerobic section; 5031. shell; 5032. baffle; 504. anoxic section; 505. primary sedimentation tank; 506. aerobic section; 5061. aerobic beginning section; 5062. aerobic middle section; 5063. aerobic ending section; 507. intermediate sedimentation tank; 508. membrane tank; 509. sludge tank; 510. clear water tank.
DETAILED DESCRIPTION
The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
An objective of the present invention is to provide an integrated treatment technology device for swine wastewater, so as to solve the technical problems existed in the prior art, reduce the footprint, and improve the effect of nitrogen and phosphorus removal.
In order to make the above objectives, features and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in FIGS. 1-4, the present invention provides an integrated treatment technology device for swine wastewater, which includes a main reaction tank 5, a step-feed inflow system 1, a stirring and diversion system, an aeration and oxygen supply system 2, a sludge diversion system 3, and a nitrification liquid reflux system 4.
The main reaction tank 5 is the core of the device and is the main site for biochemical reactions. The main reaction tank 5 includes a pretreatment section 501, and a pre-anoxic section 502, an anaerobic section 503, an anoxic section 504, a primary sedimentation tank 505, an aerobic section 506, an intermediate sedimentation tank 507, a membrane tank 508, a sludge tank 509, and a clear water tank 510 that are sequentially connected to the pretreatment section, the volume ratio of the anaerobic section 503, the anoxic section 504 and the aerobic section 506 being 1:1:2.5-1:1:3. Among them, the aerobic section 506 includes an aerobic beginning section 5061, an aerobic middle section 5062, and an aerobic ending section 5063 that are sequentially communicated with each other.
The pretreatment section 501 is dosed with a microbial preparation for conducting flocculation treatment, so as to remove large-particle suspended matters in the wastewater, thereby avoiding the high colority of a water body and heavy metal accumulation in sludge as caused by conventionally used ferric salts, aluminum salts and polymers thereof, and the like, and teratogenic, carcinogenic and mutagenic substances brought into the water body by the use of polyacrylamide.
The microbial preparation can be selected from materials in the prior art, and can also be self-prepared. In this embodiment, the microbial preparation is obtained by adopting a self-preparation manner so as to adjust the types and proportions of microorganisms to the optimum, and the preparation process is as follows: step 1: screening of bacteria resistant to high-concentration ammonia-nitrogen, screening by a streaking separation and enrichment method, with a LB medium as a substrate, the remaining activated sludge in the secondary sedimentation tank of Hangkonggang domestic sewage treatment plant (Chengdu, Sichuan) as a bacterial source, and the LB medium added with different concentrations of ammonium chloride as a screening medium; step 2, production of the microbial preparation, inoculating the selected bacteria directly in the swine wastewater, and collecting the fermentation broth after fermentation under conditions of 25 ± 5°C and 150 ± 30 r/min for 24 ± 6 h; and step 3, extraction of the microbial preparation, diluting by adding 2-4 volumes of distilled water to the fermentation broth, collecting the supernatant after centrifuging at 3,000-5,000 r/min for 10-15 min, concentrating the collected supernatant using a rotary evaporator at 40-509C (concentrating to 0.4-0.6 volumes), adding an equal volume of ice-bath acetone (containing 0.05-0.07% β-mercaptoethanol) into the concentrated solution, standing for 6-12 h, centrifuging at 3,000-5,000 r/min for 10-15 min to collect a precipitate, suspending the precipitate in 49C-pre-cooled acetone containing 0.1%-0.2% DTT (formulated by trichloroacetic acid and acetone in a volume ratio of 1:8-1:9), standing under a condition of -209C for 0.5-1 h, then centrifuging at 3,000-5,000 r/min for 10-15 min to obtain a precipitate, and vacuum-drying (609C) the precipitate to obtain the microbial preparation.
The step-feed inflow system 1 is used for guiding the inlet of the pretreatment section 501 into the pre-anoxic section 502 and the anaerobic section 503 respectively. The swine wastewater (with a water quantity set as Q), after passed through the pretreatment section 501 to remove large-particle suspended matters in it, is inflowed at the pre-anoxic section 502 and the anaerobic section 503 respectively according to a certain proportion under the action of the step-feed inflow system 1. The inlet quantity Qi of the pre-anoxic section 502 is controlled at 10%-20% Q, and the inlet quantity Cb of the anaerobic section 503 is controlled at 80%-90% Q.
The main chemical reaction occurred in the pre-anoxic section 502 is the removal of nitrate by denitrifying bacteria, and the main chemical reaction occurred in the anaerobic section 503 is the phosphorus release from phosphorus-accumulating bacteria. The provision of the pre-anoxic section 502 can prevent the nitrate nitrogen in the returned sludge from the intermediate sedimentation tank 507 from entering the anaerobic section 503 to the greatest extent, and thus avoiding influence on the phosphorus release. In order to improve the purification efficiency, in this embodiment, the pre-treated wastewater is diverted into the pre-anoxic section 502 and the anaerobic section 503 respectively by using the step-feed inflow system 1, such that on one hand, the carbon source provided by the pre-anoxic section 502 can effectively remove the nitrate, and on the other hand, it can ensure the carbon source required for releasing phosphorus from the phosphorus-accumulating bacteria in the anaerobic section 503.
Preferably, the anaerobic section 503 includes two intercommunicated anaerobic baffled reactors. As shown in FIG. 3, each anaerobic baffled reactor includes a shell 5031 and a baffle 5032 disposed on the inner surface of the top of the shell 5031. The Baffle 5032 includes an upper vertical section and a lower inclined section, the inclined section being biased toward the outlet side of the anaerobic baffled reactor. The anaerobic baffle 5032 divides the anaerobic baffled reactor into two parts, i.e., an inlet side and an outlet side, and the width ratio of the inlet side and the outlet side is 1:2-1:3. The baffle 5032 has a constant distance of
2-5 cm from the bottom end thereof to a base plate, and the baffle 5032 has a folded corner of 45-60 degrees. In order to create an ideal anaerobic condition as much as possible, a rubber sealing cushion and a stainless-steel cover plate are used above the anaerobic section 503 for tight sealing, such that it is not easy for air to enter the anaerobic reactor. A gas collection pipeline is also connected above the anaerobic section 503, for discharging the biogas generated in the anaerobic section 503.
The anaerobic section 503 is provided with anaerobic granular sludge therein, the sludge being added to 1/3-1/2 of the depth of a reactor compartment of the anaerobic baffle. The sludge in the primary sedimentation tank 505 is partially returned into the anaerobic section 503 through the sludge diversion system 3, so as to maintain the high efficiency of the anaerobic section 503. In this embodiment, the anaerobic granular sludge is obtained by self-acclimation.
After the outlet of the anaerobic section 503 enters the anoxic section 504, the denitrifying bacteria uses the organic matters in the sewage as an electron donor and uses the nitrate in the refluxed nitrification liquid in the intermediate sedimentation tank 507 as an electron acceptor, so as to convert the nitrate nitrogen into N2 and then remove the same.
Preferably, the upper portion of the primary sedimentation tank 505 has a rectangular solid shape, and is capable of temporarily storing the outlet from the anoxic section 504. The bottom of the primary sedimentation tank 505 has a 45-degree inverted semi-squared pyramid shape, which can facilitate the static settling of sludge. The sludge is partially refluxed into the anaerobic section 503 with a reflux ratio of 80%-120%, and the remaining sludge enters the sludge tank 509. The provision of the primary sedimentation tank 505 and the sludge return thereof ensure the high efficiency of nitrogen removal by biological denitrification in the anoxic section 504.
The aerobic section 506 includes an aerobic beginning section 5061, an aerobic middle section 5062, and an aerobic ending section 5063 that are sequentially communicated with each other. Each of the aerobic beginning section 5061 and the aerobic ending section 5063 is cylindrical, such that the filler has a better fluidized state under the action of aeration and stirring. The aerobic middle section 5062 has a strip shape, which prolongs the length of the wastewater treatment path under the premise of a constant hydraulic retention time.
Preferably, the aeration and oxygen supply system 2 includes a gas source, a perforated tube, a gas flowmeter and a deflation valve, and the gas source adopts a vortex gas pump. One end of the perforated tube is connected to the gas source, and the other end of the perforated tube extends into the aerobic section 506, and the gas flowmeter and the deflation valve are arranged on the perforated tube. The deflation valve is used for controlling the aeration rate, and the gas flowmeter can be used for observing the aeration rate, so that the concentration of dissolved oxygen in the aerobic section 506 is controlled at 2-5 mg/L.
The aerobic section 506 is dosed with polyethylene suspended columnar carrier filler, and the filling rate of the polyethylene suspended columnar carrier filler is 40%-60%. The polyethylene suspended columnar carrier filler has the characteristics of: a height of 8-10 mm, a diameter of 20-25 mm, a hollow cylindrical honeycomb-like structure, a melting point of 125-135°C, a specific surface area of 650-850 m2/m3, and a bulk density of 80-100 kg/m3. The filler has an inert surface, stable chemical properties, high film-forming efficiency, a great fluidized state, a fast biofilm regeneration rate, and a good hydraulic condition, can maintain a good oxygen supply environment, and the dosing and recovery of the filler is simple. A screen is arranged at the outlet of the aerobic beginning section 5061, the aerobic middle section 5062, and the aerobic ending section 5063, for preventing the outflow of the filler.
The stirring and diversion system includes a stirring structure, a billow building pump, a partition plate, and a diversion wall, so as to control the direction of the water flow, and the billow building pump is adopted to stir and push the flow to form a good hydraulic condition. A stirring structure is arranged in each of the anoxic section 504 and the aerobic section 506, and the stirring and diversion system is used for stirring the swine wastewater in the anoxic section 504 and the aerobic section 506 and divert the entire flow process of the swine wastewater.
The outlet of the aerobic ending section 5063 directly enters the intermediate sedimentation tank 507. The upper portion of the middle sedimentation tank 507 has a rectangular solid shape and can temporarily store the outlet of the aerobic section 506, such that the nitrification liquid in the middle sedimentation tank 507 can be returned to the beginning end of the anoxic section 504 through the nitrification liquid reflux system 4 with a reflux ratio of 150%-200%. The bottom of the intermediate sedimentation tank 507 has a 45-degree inverted semi-squared pyramid shape, for facilitating the static settling of sludge. The sludge is partially refluxed into the pre-anoxic section 502 with a reflux ratio of 80%-120%, and the remaining sludge enters the sludge tank 509. The provision of the intermediate sedimentation tank 507 can avoid the influence of the reagent dosing for phosphorus removal in the subsequent membrane tank 508 on the sludge returned to the pre-anoxic section 502.
The intermediate sedimentation tank 507 and the primary sedimentation tank 505 have the similar sludge return structure, and the intermediate sedimentation tank 507 will be taken as an example below for illustration. As shown in FIG. 4, a valve 301 is located below the intermediate sedimentation tank 507, for controlling the outflow of sludge from the intermediate sedimentation tank 507. After the outflow of the sludge, the sludge may enter a branch circuit provided with the sludge return pump 302 to return to the pre-anoxic section 502; or it may also enter a branch circuit opening into the sludge tank 509. The sludge return pump 302 is connected in parallel with a bypass pipe, and the valve 301 is disposed on each of the branch circuit of the sludge return pump 302, the branch circuit of the bypass pipe, and the branch circuit opening into the sludge tank 509. By adjusting the closing degree of the valve 301 on the branch circuit of the bypass pipe and the branch circuit of the sludge return pump 302, the flow rate of sludge return can be controlled.
The sludge diversion system 3 includes a first sludge diversion system 31, a second sludge diversion system 32, and a third sludge diversion system 33, wherein the first sludge diversion system 31 divides the sludge in the primary sedimentation tank 505 into two parts, one is refluxed into the anaerobic section 503 and the other is discharged into the sludge tank 509; the second sludge diversion system 32 divides the sludge in the intermediate sedimentation tank 507 into two parts, one is refluxed into the pre-anoxic section 502 and the other is discharged into the sludge tank 509; and the third sludge diversion system 33 divides the sludge in the sludge tank 509 into two parts, one is refluxed into the aerobic section 506 and the other is discharged into a sludge treatment system.
The membrane assembly in the membrane tank 508 is a hollow fiber membrane, and under the suction action of a water production pump the swine wastewater passes through the hollow fiber membrane and enters the clear water tank 510, to realize reuse of the reclaimed water. The sludge retained by the hollow fiber membrane in the membrane tank 508 enters the sludge tank 509. After the phosphorus release, part of the sludge is returned into the aerobic beginning section 5061 and the remaining sludge enters a sludge treatment system. The supernatant from the sludge tank enters the cleaning water tank 510 and is combined with the outlet of the membrane tank 508 for reuse. After a simple settling in the intermediate sedimentation tank 507, the sludge concentration in the membrane tank 508 will be decreased, and the low sludge concentration in the membrane tank 508 can reduce the potential of membrane pollution. The membrane tank 508 is provided with a reagent dosing system for enhancing the removal of phosphorus from the wastewater, and polyaluminum chloride (PAC) is used as the reagent.
The clear water tank 510 is used for storing the outlet of the membrane tank 508 and the supernatant of the sludge tank 509, and conducting sterilizing. The clear water tank 510 is provided with an ultraviolet lamp sterilizing trough, which consists of total 2 sterilizing modules, each module including 8 ultraviolet lamps.
The integrated treatment technology device for swine wastewater has a size of 2,000 mm x 1,200 mm x 1,000 mm, an actual depth of 600 mm, and a designed treatment scale of 2.4-3.2 m3/d. The total hydraulic retention time is 10.5 to 14.5 h, in which the retention time in the pretreatment section 501 is 0.25-0.75 h; the retention time in the pre-anoxic section 502 is 0.5-1 h; the retention time in the anaerobic section 503 is 2-2.5 h; the retention time in the anoxic section 504 is 2-3 h; the retention time in the primary sedimentation tank 505 is 0.75-1.25 h; the retention time in the aerobic beginning section 5061, the aerobic middle section 5062, and the aerobic ending section 5063 is each 1.25-1.75 h; the retention time in the intermediate sedimentation tank 507 is 0.75-1.25 h; the retention time in the membrane tank 508 is 1.25-1.75 h; and the retention time in the sludge tank 509 is 0.75-1.25 h.
An emergency discharge outlet is provided at the bottom of each of the pre-anoxic section 502 and the aerobic section 5063 of the integrated device. When the integrated device operates normally, the valve of the emergency discharge outlet is closed, and when the operation of the integrated device fails or during device maintenance, the sewage can be discharged from the emergency discharge outlet.
The following illustrates the treatment effect of the integrated treatment technology device provided by the present invention in connection with specific treatment embodiments of the swine wastewater.
Embodiment 1
The operating conditions of the integrated treatment technology device for swine wastewater were: an ambient temperature of 25 ± 3°C; and a designed treatment water quantity of 3 m3/d, wherein the concentrations of the suspended matters, COD, BOD5, ammonia nitrogen, and total phosphorus were 467.6 mg/L, 1028.3 mg/L, 284.2 mg/L, 644.7 mg/L, and 26.6 mg/L, respectively; the inlet quantity of the pre-anoxic section 502 was QI = 15%Q, and the inlet quantity of the anaerobic section 503 was QI = 85%Q; the dosage of the microbial preparation in the pretreatment section 501 was 20 mg/L; the width ratio of the downward flow chambers and upward flow chambers in each of the two compartments of the anaerobic baffled reactor was 1:2, the baffle 5032 had a constant distance of 2 cm from the bottom end thereof to a base plate, the baffle 5032 had a folded corner of 45 degrees, the sludge adopted the anaerobic granular sludge self-cultivated by the present laboratory, and the sludge was added to 1/3 of the reactor compartment of the anaerobic baffle 5032; the content of dissolved oxygen in the aerobic beginning section 5061 was controlled at 4 ± 0.5 mg / L, the content of dissolved oxygen in the aerobic middle section 5062 was controlled at 3 ± 0.5 mg / L, the content of dissolved oxygen in the aerobic ending section 5063 was controlled at 2 ± 0.5 mg/L, and the filling rate of the suspended columnar filler in the aerobic section 506 was 50%; the primary sedimentation tank 505 had a sludge return ratio of 100%; the middle sedimentation tank 507 had a nitrification liquid reflux ratio of 150%, and a sludge return ratio of 100%; and the membrane tank 508 had a PAC dosage of 50 ppm.
Under the above operating conditions, the wastewater treatment results of the integrated treatment technology device was: after stable operation of 40 days, the concentrations of the suspended matters, COD, BOD5, ammonia nitrogen, and total phosphorus in the treated outlet were 12.4 mg/L, 151.2 mg/L, 32.8 mg/L, 6.18 mg/L, and 2.44 mg/L respectively.
Embodiment 2
The operating conditions of the integrated treatment technology device for swine wastewater were: an ambient temperature of 15 ± 2°C; and a designed treatment water quantity of 2.5 m3/d, wherein the concentrations of the suspended matters, COD, BOD5, ammonia nitrogen, and total phosphorus were 467.6 mg/L, 1028.3 mg/L, 284.2 mg/L, 644.7 mg/L, and 26.6 mg/L, respectively; the inlet quantity of the pre-anoxic section 502 was QI = 10%Q, and the inlet quantity of the anaerobic section 503 was QI = 90%Q; the dosage of the microbial preparation in the pretreatment section 501 was 30 mg/L; the width ratio of the downward flow chambers and upward flow chambers in each of the two compartments of the anaerobic baffled reactor was 1:3, the baffle 5032 had a constant distance of 5 cm from the bottom end thereof to a base plate, the baffle 5032 had a folded corner of 45 degrees, the sludge adopted the anaerobic granular sludge self-cultivated by the present laboratory, and the sludge was added to 1/2 of the reactor compartment of the anaerobic baffle 5032; the content of dissolved oxygen in the aerobic beginning section 5061 was controlled at 4.5 ± 0.5 mg / L, the content of dissolved oxygen in the aerobic middle section 5062 was controlled at 3.5 ± 0.5 mg / L, the content of dissolved oxygen in the aerobic ending section 5063 was controlled at 2.5 ± 0.5 mg/L, and the filling rate of the suspended columnar filler in the aerobic section 506 was 60%; the primary sedimentation tank 505 had a sludge return ratio of 120%; the middle sedimentation tank 507 had a nitrification liquid reflux ratio of 200%, and a sludge return ratio of 120%; and the membrane tank 508 had a PAC dosage of 80 ppm.
Under the above operating conditions, the wastewater treatment results of the integrated treatment technology device was: after stable operation of 40 days, the concentrations of the suspended matters, COD, BOD5, ammonia nitrogen, and total phosphorus in the treated outlet were 16.2 mg/L, 173.6 mg/L, 34.1 mg/L, 6.77 mg/L, and 2.95 mg/L respectively.
Specific embodiments are applied in this specification to describe the principle and implementations of the present invention. The description of the aforementioned embodiments is only used for facilitating understanding of the method and the core idea of the present invention; and meanwhile, for those of ordinary skills in the art, there will be changes in specific implementations and application scope in accordance with the concept of the present invention. In conclusion, the content of this specification shall not be construed as a limitation to the invention.
Claims (10)
1. An integrated treatment technology device for swine wastewater, comprising a main reaction tank, a step-feed inflow system, a stirring and diversion system, an aeration and oxygen supply system, a sludge diversion system and a nitrification liquid reflux system, the main reaction tank comprising a pretreatment section, and a pre-anoxic section, an anaerobic section, an anoxic section, a primary sedimentation tank, an aerobic section, an intermediate sedimentation tank, a membrane tank, a sludge tank, and a clear water tank that are sequentially connected to the pretreatment section;
the pretreatment section is dosed with a microbial preparation for conducting flocculation treatment; the step-feed inflow system is used for guiding the inflow of the pretreatment section into the pre-anoxic section and the anaerobic section respectively; the stirring and diversion system is used for stirring the swine wastewater in the anoxic section and the aerobic section and divert the entire flow process of the swine wastewater; the aeration and oxygen supply system is arranged at the aerobic section; and the nitrification liquid reflux system is used for refluxing the nitrification liquid in the intermediate sedimentation tank to the anoxic section; and the sludge diversion system comprises a first sludge diversion system, a second sludge diversion system, and a third sludge diversion system, wherein the first sludge diversion system divides the sludge in the primary sedimentation tank into two parts, one is refluxed into the anaerobic section and the other is discharged into the sludge tank; the second sludge diversion system divides the sludge in the intermediate sedimentation tank into two parts, one is refluxed into the pre-anoxic section and the other is discharged into the sludge tank; and the third sludge diversion system divides the sludge in the sludge tank into two parts, one is refluxed into the aerobic section and the other is discharged into a sludge treatment system.
2. The integrated treatment technology device for swine wastewater of claim 1, wherein the membrane assembly in the membrane tank is a hollow fiber membrane and the membrane tank is used for dosing a phosphorus removal agent.
3. The integrated treatment technology device for swine wastewater of claim 1, wherein the aeration and oxygen supply system comprises a gas source, a perforated tube, a gas flowmeter and a deflation valve, wherein one end of the perforated tube is connected to the gas source, and the other end of the perforated tube extends into the aerobic section, and the gas flowmeter and the deflation valve are arranged on the perforated tube.
4. The integrated treatment technology device for swine wastewater of claim 1, wherein the aerobic section comprises an aerobic beginning section, an aerobic middle section, and an aerobic ending section that are sequentially communicated with each other, the aerobic beginning section and the aerobic ending section each having a cylindrical shape, and the aerobic middle section having a strip shape.
5. The integrated treatment technology device for swine wastewater of claim 1, wherein the clear water tank is provided with a sterilizing trough therein, and the disinfection tank includes an ultraviolet disinfection lamp.
6. The integrated treatment technology device for swine wastewater of claim 1, wherein the tank bottom of each of the intermediate sedimentation tank and the primary sedimentation tank is tapered.
7. The integrated treatment technology device for swine wastewater of claim 1, wherein the anaerobic section comprises two intercommunicated anaerobic baffled reactors, wherein each of the anaerobic baffled reactors comprises a shell and a baffle disposed on the inner surface of the top of the shell, and the baffle comprises an upper vertical section and a lower inclined section, the inclined section being biased toward the outlet side of the anaerobic baffled reactor.
8. The integrated treatment technology device for swine wastewater of claim 7, wherein the anaerobic baffle divides the anaerobic baffled reactor into two parts, i.e., an inlet side and an outlet side, and the width ratio of the inlet side and the outlet side is 1:2-1:3.
9. The integrated treatment technology device for swine wastewater of claim 1, wherein the aerobic section is dosed with a polyethylene suspended columnar carrier filler.
10. The integrated treatment technology device for swine wastewater of claim 9, wherein the polyethylene suspended columnar carrier filler is a honeycomb hollow cylindrical structure, and the polyethylene suspended columnar carrier filler has a specific surface area of 650-850 m2/m3 and a bulk density of 80-100 kg/m3.
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| CN109380088A (en) * | 2018-11-26 | 2019-02-26 | 江西省科学院 | A kind of Low hilly red soil small watershed ecological harnessing system |
| CN109534611A (en) * | 2018-12-21 | 2019-03-29 | 广东尚骏科技有限公司 | Integrated sewage disposal equipment for reclaiming with pretreatment pool |
| CN112978916A (en) * | 2019-12-16 | 2021-06-18 | 江苏孚璋生物技术有限公司 | Hydraulic circulation mode of continuous flow domestic sewage treatment equipment |
| CN112499760A (en) * | 2020-09-28 | 2021-03-16 | 四川洇沃环境科技有限公司 | Intelligent integrated sewage treatment device |
| CN112293340B (en) * | 2020-10-30 | 2022-12-13 | 南京青龙水务有限公司 | Qi lian mountain naked carp is bred and uses oxygenating device |
| CN112174451A (en) * | 2020-11-09 | 2021-01-05 | 中冶赛迪工程技术股份有限公司 | Pig raising wastewater treatment process and system |
| CN112723542B (en) * | 2020-11-20 | 2022-10-14 | 成都市排水有限责任公司 | Enhanced denitrification system and method suitable for high sludge concentration |
| CN113429070B (en) * | 2021-06-30 | 2022-04-08 | 广东北控环保装备有限公司 | Rural sewage treatment plant who possesses flexible design in adjustable region |
| CN114644400A (en) * | 2022-04-25 | 2022-06-21 | 北控水务(中国)投资有限公司 | Integrated sewage treatment device |
| CN115432820B (en) * | 2022-08-24 | 2023-07-21 | 中核四0四有限公司 | Sewage treatment method and system |
| CN117509997B (en) * | 2024-01-05 | 2024-03-26 | 北京东雷恒业环保科技有限公司 | Pretreatment method of steelmaking wastewater |
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