CN114180721B - Cultivation wastewater and sewage treatment device and technology - Google Patents
Cultivation wastewater and sewage treatment device and technology Download PDFInfo
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- CN114180721B CN114180721B CN202111592489.2A CN202111592489A CN114180721B CN 114180721 B CN114180721 B CN 114180721B CN 202111592489 A CN202111592489 A CN 202111592489A CN 114180721 B CN114180721 B CN 114180721B
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- 239000002351 wastewater Substances 0.000 title claims abstract description 38
- 239000010865 sewage Substances 0.000 title claims abstract description 30
- 238000005516 engineering process Methods 0.000 title description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 167
- 239000010802 sludge Substances 0.000 claims abstract description 139
- 238000009280 upflow anaerobic sludge blanket technology Methods 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000009360 aquaculture Methods 0.000 claims abstract description 11
- 244000144974 aquaculture Species 0.000 claims abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 14
- 238000010992 reflux Methods 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 10
- 239000002361 compost Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 8
- 230000007062 hydrolysis Effects 0.000 claims description 8
- 238000006460 hydrolysis reaction Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 3
- 150000003018 phosphorus compounds Chemical class 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims 2
- 238000009395 breeding Methods 0.000 claims 1
- 230000001488 breeding effect Effects 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 10
- 239000011574 phosphorus Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 6
- 230000003179 granulation Effects 0.000 abstract description 4
- 238000005469 granulation Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 7
- 210000003608 fece Anatomy 0.000 description 6
- 239000010871 livestock manure Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 4
- 238000005273 aeration Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000006396 nitration reaction Methods 0.000 description 4
- 241000589651 Zoogloea Species 0.000 description 3
- 238000005842 biochemical reaction Methods 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 244000144972 livestock Species 0.000 description 3
- 244000144977 poultry Species 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 241001453382 Nitrosomonadales Species 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical class [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000001112 coagulating effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003301 hydrolyzing effect Effects 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000012163 sequencing technique Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 230000002053 acidogenic effect Effects 0.000 description 1
- 238000012668 chain scission Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002550 fecal effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000003834 intracellular effect Effects 0.000 description 1
- 239000003621 irrigation water Substances 0.000 description 1
- 150000002605 large molecules Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000003895 organic fertilizer Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F3/00—Fertilisers from human or animal excrements, e.g. manure
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
-
- 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
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Biodiversity & Conservation Biology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a cultivation wastewater and sewage treatment device which comprises a UASB reactor and a multistage continuous short-cut nitrification reactor which are connected through a pipeline, wherein the UASB reactor comprises a primary water distributor and a secondary water distributor which are arranged in the UASB reactor, a sludge layer and a suspended sludge layer are arranged in the UASB reactor, the primary water distributor is arranged on the sludge layer to guide water flow to the bottom of the sludge layer, the secondary water distributor is arranged on the suspended sludge layer, and a water inlet of the secondary water distributor guides and returns suspended sludge at the top of the suspended sludge layer to the bottom of the suspended sludge layer for being sprayed out. The invention also discloses a cultivation wastewater and sewage treatment process. The device and the process for treating the aquaculture wastewater can improve collision and friction among granular sludge, improve activity of the granular sludge, accelerate granulation of suspended sludge, adjust total phosphorus concentration, reduce chemical dephosphorization agent addition and reduce process energy consumption through backflow generated by the secondary water distributor in the UASB reactor.
Description
Technical Field
The invention relates to the technical field of cultivation wastewater treatment, in particular to a cultivation wastewater and sewage treatment device and technology.
Background
At present, as the requirements for livestock and poultry manure treatment are higher and higher, the national control force is continuously increased, and the treatment of manure in large-scale farms is gradually a core problem for restricting the cultivation development. The traditional fecal sewage treatment process comprises UASB (Up flow Anaerobic Sludge BlanketExpanded Granular Sludge Bed up-flow Anaerobic sludge bed reactor)/hydrolytic acidification+SBR (sequencing batch reactor activated sludge process sequencing batch activated sludge process)/AAO (Anaerobic-Anoxic-aerobic process) and the like, is suitable for meeting the discharge requirements of 'farm irrigation water quality standard' or 'livestock and poultry raising pollutant discharge standard', has new requirements on large-scale raising sewage discharge and pollution discharge limitation along with the improvement of ecological environment quality standard of China, and has no capability of treating COD (Chemical Oxygen Demand chemical oxygen demand), total nitrogen and total phosphorus in the traditional process, so that a low-cost and high-efficiency treatment device and process capable of meeting advanced nitrogen and phosphorus treatment are urgently needed to solve the problems.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the invention is expected to provide a cultivation wastewater and sewage treatment device and technology for effectively removing nitrogen and phosphorus.
The technical scheme of the invention is realized as follows:
the utility model provides a breed waste water sewage treatment plant, includes UASB reactor and multistage continuous short-cut nitrification reactor through pipe connection, UASB reactor is including setting up at its inside primary water distributor and secondary water distributor, be formed with mud layer and suspension mud layer in the UASB reactor, primary water distributor set up in the mud layer is in order to guide rivers to mud layer bottom, secondary water distributor sets up suspension mud layer, secondary water distributor's water inlet will suspension mud guide reflux at suspension mud layer top extremely the bottom of suspension mud layer is spouted again.
Preferably, the secondary water distributor comprises a water inlet, a pipeline pump and a water distribution mechanism, wherein the water inlet is positioned in the suspended sludge layer, the water inlet is connected with the water distribution mechanism through the pipeline pump, the pipeline pump pumps the suspended sludge entering the water inlet to the water distribution mechanism, and the water distribution mechanism ejects the suspended sludge again.
Preferably, the water inlet and the air outlet of the UASB reactor are arranged right opposite to each other and are positioned right below the air outlet.
Preferably, the water distribution mechanism comprises a water inlet main pipe connected with the pipeline pump and at least one water outlet branch pipe connected with the water inlet main pipe.
Preferably, the water outlet branch pipes are a plurality of evenly distributed circumferentially.
Preferably, the water outlet branch pipe is provided with a plurality of water outlet holes, and one end of the water outlet branch pipe, which is far away from the water inlet main pipe, is provided with a plug.
Preferably, the primary water distributor comprises a lifting pump connected with the water inlet tank and a water distribution port connected with the lifting pump through a pipeline, and the water distribution port is positioned at the sludge outlet of the UASB reactor.
Preferably, the multistage continuous short-cut nitrification reactor comprises a plurality of grading short-cut nitrification reactors, each grading short-cut nitrification reactor is internally provided with a plurality of partition boards, the partition boards divide the internal space of the grading short-cut nitrification reactor into a plurality of interval areas, and each interval area is internally provided with a water inlet area and a water outlet area;
one end of the partition board is fixedly connected to the inner wall of the grading short-cut nitrification reactor, the other end of the partition board is connected with a turning guide plate, and when the cultivation wastewater and sewage enter from one interval area to the other interval area, the cultivation wastewater and sewage enter from the turning guide plate.
A cultivation wastewater and sewage treatment process comprises the following steps:
step S1, conveying the cultured manure to a dry-wet separator to perform dry-wet separation treatment on the mixture, and discharging dry manure into sludge compost;
s2, conveying the aquaculture wastewater produced after the dry-wet separation treatment to a preprocessor, carrying out hydrolysis adjustment and mixed precipitation treatment on the wastewater by the preprocessor, discharging part of low-purity nitrogen and phosphorus compounds into sludge compost, and conveying the rest part of aquaculture wastewater to a UASB reactor;
step S3, after entering the UASB reactor, the primary water distributor distributes the sludge layer in the UASB reactor for the first time, and meanwhile, the water inlet of the secondary water distributor guides the suspended sludge at the top of the suspended sludge layer to flow back to the bottom of the suspended sludge layer and then is sprayed out to form the second water distribution;
and S4, conveying the sludge discharged from the sludge discharge port of the UASB reactor into a multistage continuous short-cut nitrification reactor for nitrogen removal treatment, and discharging the sludge into sludge compost.
Preferably, in step S3, the ratio of the reflux amount of the secondary water distributor to the water inflow amount of the primary water distributor is a reflux ratio of 2-2.5, the ratio of the water inflow amount of the secondary water distributor to the cross-sectional area of the suspended sludge layer is a surface hydraulic load, and the surface hydraulic load is less than 0.6m 3 /m 2 ·h。
The cultivation wastewater and sewage treatment device and the technology provided by the embodiment of the invention have the following effects:
1. after stirring the sludge at the bottom of the sludge layer through the arranged primary water distributor, the formation of a suspended sludge layer can be accelerated, working conditions are provided for the secondary water distributor, the secondary water distributor is arranged on the suspended sludge layer, the suspended sludge at the top of the suspended sludge layer is guided to flow back to the bottom of the suspended sludge layer and is sprayed out again to form secondary backflow, as a large amount of granular sludge and zoogloea are suspended in the suspended sludge layer, the treatment efficiency of the granular sludge can be maximized only by periodically peeling off dead sludge on the outer surface, and the backflow generated by the secondary water distributor in the UASB reactor can improve the collision and friction between the granular sludge, thereby being beneficial to improving the activity of the granular sludge, accelerating the granulation speed of the suspended sludge, adjusting the concentration of total phosphorus, reducing the dosage of chemical dephosphorization and reducing the energy consumption in the process;
2. the improved UASB reactor is combined with the multistage continuous short-cut nitrification reactor to treat, so that the aeration rate is saved, and the efficiency of removing ammonia nitrogen and total phosphorus is obviously improved;
3. the moderate temperature anaerobic in the UASB reactor improves the reaction efficiency and has positive effect on ammonia nitrogen removal;
4. the total nitrogen removal efficiency is improved through multistage continuous grading short-cut nitrification reaction, and more alkalinity is automatically supplemented to a biochemical reaction system, so that the additional carbon source is reduced, and the medicament cost is saved.
Drawings
FIG. 1 is a schematic diagram of a cultivation wastewater and sewage treatment device provided by the invention;
FIG. 2 is a schematic structural view of the cultivation wastewater and sewage treatment apparatus shown in FIG. 1;
FIG. 3 is a schematic diagram of the multistage continuous short-cut nitration reactor shown in FIG. 1;
FIG. 4 is a schematic view of a part of the structure of the secondary water distributor shown in FIG. 1;
FIG. 5 is a schematic view of a part of the secondary water distributor shown in FIG. 4 at another angle;
FIG. 6 is a flow chart of the cultivation wastewater and sewage treatment process provided by the invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Please refer to fig. 1-5. The aquaculture wastewater and sewage treatment device comprises a dry-wet separator, a preprocessor, a UASB reactor 3 and a multistage continuous short-cut nitrification reactor which are connected through a pipeline, wherein aquaculture wastewater and sewage sequentially pass through the dry-wet separator for dry-wet separation treatment, the preprocessor for hydrolysis adjustment and coagulating sedimentation treatment, the UASB reactor for anaerobic treatment and the multistage continuous short-cut nitrification reactor for nitrogen removal treatment.
Specifically, the dry-wet separation adopts an inclined screen type dry-wet separator, and the pretreatment device adopts a hydrolysis adjustment and coagulating sedimentation mode. Wherein, pretreatment and dry-wet separation are two procedures, the retention time of hydrolysis adjustment is more than 4 days, and the device has both adjustment capability and hydrolysis acidification function. The enzyme released by hydrolytic bacteria and acidogenic bacteria promotes the biological catalytic reaction of macromolecular substances which are difficult to be biodegraded in water, the biological catalytic reaction is specifically shown as chain scission and water solubility, and microorganisms utilize water-soluble substrates to finish intracellular biological reaction and simultaneously discharge various organic acids. Before entering the UASB reactor, the pH value is adjusted by adding sodium carbonate, and the pH value is more than 7. The specific pH value is controlled between 7.2 and 8.5.
The UASB reactor 3 is used for carrying out anaerobic treatment on the cultivation wastewater and sewage. The UASB reactor 3 comprises a primary water distributor 31 and a secondary water distributor 33 which are arranged in the UASB reactor 3, a sludge layer 35 and a suspended sludge layer 37 are arranged in the UASB reactor 3, and the primary water distributor 31 is arranged on the sludge layer 35 to guide water flow in the water inlet tank 8 to the bottom of the sludge layer 35, so that on one hand, short flow is prevented, and the phenomenon of uneven water distribution is reduced. On the other hand, the water flow sprayed by the primary water distributor 31 is used for stirring the sludge at the sludge outlet of the UASB reactor to form a dynamic sludge layer 35, which is beneficial to the generation of a suspended sludge layer 37 and provides conditions for the operation of the secondary water distributor 33.
The secondary water distributor 33 is arranged on the suspended sludge layer 37, and the water inlet of the secondary water distributor 33 guides the suspended sludge at the top of the suspended sludge layer 37 to flow back to the bottom of the suspended sludge layer 37 and then is sprayed out to form secondary backflow. Because a large amount of granular sludge and zoogloea are suspended in the suspended sludge layer 37, the granular sludge can maximize the treatment efficiency only by periodically peeling off dead sludge on the outer surface, and the collision and friction between the granular sludge can be improved by secondary reflux in the middle of the UASB reactor, so that the activity of the granular sludge is improved.
It should be noted that, the UASB reactor is further connected with a gas collecting device 6 and a gas treatment system 7, the UASB reactor degrades COD for the first time, biogas generated in the degradation process is transferred to the gas treatment system 7 through the gas collecting device 6 arranged above, the secondary water distributor 33 adopts a water distribution mode of lower inlet and upper outlet, and utilizes biogas energy to heat and preserve heat of the UASB reactor. In this process, large molecules degrade into small molecules due to hydrolysis of a large amount of suspended matter into soluble substances, and BOD of the effluent 5 /COD cr The value is improved, and the biodegradability of the wastewater is also improved.
The secondary water distributor 33 comprises a water inlet 331, a pipeline pump 333 and a water distribution mechanism 335, wherein the water inlet 331 is positioned in the suspended sludge layer 37, the water inlet 331 and the water distribution mechanism 335 are connected through the pipeline pump 333, the pipeline pump 333 pumps the suspended sludge entering the water inlet 331 to the water distribution mechanism 335, and the water distribution mechanism 335 sprays the suspended sludge to form secondary backflow water distribution. Since the suspended sludge layer 37 is the core of the UASB reactor in the anaerobic reaction, the thickness of the suspended sludge layer 37, the formation of granular sludge and biomass are key to ensuring the reaction effect. The secondary reflux water distribution suspended sludge layer 37 is stirred, and collision and friction among the granular sludge in the suspended sludge layer 37 are beneficial to improving the activity of the granular sludge so as to quickly granulate.
The water inlet 331 is arranged opposite to the air outlet 10 (namely, biogas outlet) of the UASB reactor, and is positioned right below the air outlet 10. Thus, the biogas generated by the water inlet can be rapidly discharged to the air outlet and enter the gas collecting device 6 connected with the air outlet.
As shown in fig. 4 and 5, the water distribution mechanism 335 includes a main water inlet pipe 336 connected to the pipeline pump, and at least one water outlet pipe 337 connected to the main water inlet pipe 336. Each water outlet branch pipe sprays the returned suspended sludge outwards. Specifically, in this embodiment, the water outlet pipes are a plurality of pipes uniformly distributed in the circumferential direction. Preferably, in this embodiment, the number of the water outlet branch pipes is 6.
The water outlet branch pipe 337 is provided with a plurality of water outlet holes, and one end of the water outlet branch pipe far away from the water inlet main pipe is provided with a plug 338. The suspended sludge in the suspended sludge layer 37 is discharged from the water outlet, and is used for stirring the suspended sludge in the suspended sludge layer 37, so that suspended sludge particles collide and rub, and the formation of the particles is accelerated.
As shown in fig. 1, the primary water distributor 31 includes a lift pump 311 connected to a water inlet tank, and a water distribution port 313 connected to the lift pump through a pipe, where the water distribution port is located at a sludge outlet of the UASB reactor. The lifting pump 311 pumps water flow in the water inlet tank 8 to the water distribution port 313, and the water flow sprayed out of the water distribution port agitates sludge in the UASB reactor, so that on one hand, the phenomenon of short flow at a sludge outlet is prevented, on the other hand, the movement of a sludge layer is accelerated, the generation of a suspended sludge layer 37 is accelerated, and conditions are provided for the secondary water distributor 33 to process the granulation of the suspended sludge layer 37.
As shown in fig. 3, the multistage continuous short-cut nitrification reactor includes a plurality of graded short-cut nitrification reactors 5, specifically, in this embodiment, three graded short-cut nitrification reactors. Three grading short-cut nitration reactors form three-stage reflux treatment. A plurality of partition plates 51 are arranged in each grading short-cut nitrification reactor, the partition plates divide the internal space of the grading short-cut nitrification reactor into a plurality of interval areas, and a water inlet area and a water outlet area are arranged in each interval area. The water flow trend and the reflux trend of the grading short-cut nitration reactor are shown in figure 3.
As shown in fig. 1, the number of the partition boards 51 is plural, specifically, in this embodiment, 6 partition boards 51 are used to divide the internal space atmosphere of the short-range nitration reactor into a plurality of space areas. The interval region is internally provided with a water inlet region and a water outlet region, one end of the partition plate is fixedly connected to the inner wall of the grading short-cut nitrification reactor, the other end of the partition plate is connected with a turning guide plate 53, and when the cultivation wastewater and sewage enter from one interval region to the other interval region, the cultivation wastewater and sewage enter from the turning guide plate. Specifically, the turning angle of the turning guide plate is 45 degrees, and the turning guide plate is used for guiding flow so as to reduce the guiding dead zone.
As shown in figure 3, three grading short-cut nitrification reactors respectively form a three-stage short-cut nitrification treatment process of three-stage backflow, three-stage to two-stage backflow and two-stage to one-stage backflow, wherein part of ammonia nitrogen is firstly converted into nitrite nitrogen through ammonia oxidizing bacteria, and the rest ammonia nitrogen and nitrite nitrogen are converted into nitrogen to realize nitrogen removal, so that the method is a simple denitrification path. The process has the advantages of no consumption of organic carbon source, low sludge yield, low aeration rate and the like.
As shown in fig. 6, the invention also provides a cultivation wastewater and sewage treatment process, which comprises the following steps:
step S1, dry-wet separation: and (3) conveying the livestock and poultry manure mixture to a dry-wet separator to perform dry-wet separation treatment on the mixture, and discharging dry manure residues into a container loaded with sludge compost.
Step S2, pretreatment: and conveying the aquaculture wastewater produced after the dry-wet separation treatment to a preprocessor, carrying out hydrolysis adjustment and mixed precipitation treatment on the wastewater by the preprocessor, obtaining a part of low-purity nitrogen-phosphorus compounds, then discharging the low-purity nitrogen-phosphorus compounds into sludge compost, and conveying the other part of obtained aquaculture wastewater to a UASB reactor.
Step S3, UASB processing: after entering the UASB reactor, the primary water distributor 31 distributes the sludge layer in the UASB reactor for the first time to stir the sludge at the sludge outlet, and meanwhile, the water inlet of the secondary water distributor 33 guides the suspended sludge at the top of the suspended sludge layer 37 to flow back to the bottom of the suspended sludge layer 37 for the second time to be sprayed out to form the second water distribution; the liquid above the reactor is returned to the lower part of the sludge layer by secondary reflux water distribution, the ratio of the reflux quantity of the secondary water distributor 33 to the water inflow of the primary water distributor 31 is reflux ratio which is 2-2.5, the ratio of the water inflow of the secondary water distributor 33 to the cross section area of the suspended sludge layer 37 is surface hydraulic load which is less than 0.6m 3 /m 2 H, favoring the formation of granular sludge.
Step S4, short-cut nitrification: the sludge discharged from the sludge discharge port of the UASB reactor is conveyed into a multistage continuous short-cut nitrification reactor to be subjected to nitrogen removal treatment, and the residual sludge is discharged into sludge compost to be used as organic fertilizer, so that the resource utilization is improved, and the residual sewage after treatment reaches the discharge standard. Part of ammonia nitrogen in the multistage short-cut nitrification reactor is firstly converted into nitrite nitrogen through ammonia oxidizing bacteria, and the rest ammonia nitrogen and nitrite nitrogen are converted into nitrogen, so that nitrogen removal is realized, and the multistage short-cut nitrification reactor is a simple denitrification path. The process has the advantages of no consumption of organic carbon source, low sludge yield, low aeration rate and the like.
The combination mode of the multistage continuous short-cut nitrification reactor and the UASB reactor ensures that the C/N (carbon nitrogen ratio) ratio is more reasonable in distribution, and can stably reduce COD to below 100 mg/L;
typical water quality index of water intake: COD (7000-10000 mg/L), ammonia nitrogen (700-1000 mg/L), total phosphorus (80-100 mg/L), average removal rate of COD 98.5% -99.5%, and average removal rate of ammonia nitrogen 99-99.8%. Therefore, the efficiency of the improved UASB reactor and the multistage continuous short-cut nitrification reactor for combined treatment to remove ammonia nitrogen and total phosphorus is obviously improved, and more alkalinity is automatically supplemented to a biochemical reaction system, so that the additional carbon source is reduced, and the medicament cost is saved.
The cultivation wastewater and sewage treatment device and the technology provided by the embodiment of the invention have the following effects:
1. after stirring the sludge at the bottom of the sludge layer through the arranged primary water distributor, the formation of a suspended sludge layer can be accelerated, working conditions are provided for the secondary water distributor, the secondary water distributor is arranged on the suspended sludge layer, the suspended sludge at the top of the suspended sludge layer is guided to flow back to the bottom of the suspended sludge layer and is sprayed out again to form secondary backflow, as a large amount of granular sludge and zoogloea are suspended in the suspended sludge layer, the treatment efficiency of the granular sludge can be maximized only by periodically peeling off dead sludge on the outer surface, and the backflow generated by the secondary water distributor in the UASB reactor can improve the collision and friction between the granular sludge, thereby being beneficial to improving the activity of the granular sludge, accelerating the granulation speed of the suspended sludge, adjusting the concentration of total phosphorus, reducing the dosage of chemical dephosphorization and reducing the energy consumption in the process;
2. the improved UASB reactor is combined with the multistage continuous short-cut nitrification reactor to treat, so that the aeration rate is saved, and the efficiency of removing ammonia nitrogen and total phosphorus is obviously improved;
3. the moderate temperature anaerobic in the UASB reactor improves the reaction efficiency and has positive effect on ammonia nitrogen removal;
4. the total nitrogen removal efficiency is improved through multistage continuous grading short-cut nitrification reaction, and more alkalinity is automatically supplemented to a biochemical reaction system, so that the additional carbon source is reduced, and the medicament cost is saved.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The device is characterized by comprising a UASB reactor and a multistage continuous short-cut nitrification reactor which are connected through a pipeline, wherein the UASB reactor comprises a primary water distributor and a secondary water distributor which are arranged in the UASB reactor, a sludge layer and a suspended sludge layer are formed in the UASB reactor, the primary water distributor is arranged on the sludge layer to guide water flow to the bottom of the sludge layer, the secondary water distributor is arranged on the suspended sludge layer, and a water inlet of the secondary water distributor guides and flows back suspended sludge at the top of the suspended sludge layer to the bottom of the suspended sludge layer for re-spraying;
the secondary water distributor comprises a water inlet, a pipeline pump and a water distribution mechanism, wherein the water inlet is positioned in the suspended sludge layer, the water inlet is connected with the water distribution mechanism through the pipeline pump, the pipeline pump pumps the suspended sludge entering the water inlet to the water distribution mechanism, and the water distribution mechanism ejects the suspended sludge;
the water inlet is opposite to the air outlet of the UASB reactor and is positioned right below the air outlet;
the water distribution mechanism comprises a water inlet main pipe connected with the pipeline pump and at least one water outlet branch pipe connected with the water inlet main pipe;
the water outlet branch pipes are a plurality of evenly distributed in the circumferential direction;
a plurality of water outlet holes are formed in the water outlet branch pipe, and a plug is arranged at one end, away from the water inlet main pipe, of the water outlet branch pipe;
the primary water distributor comprises a lifting pump connected with the water inlet tank and a water distribution port connected with the lifting pump through a pipeline, and the water distribution port is positioned at the sludge outlet of the UASB reactor.
2. The aquaculture wastewater and sewage treatment device according to claim 1, wherein the multistage continuous short-cut nitrification reactor consists of a plurality of graded short-cut nitrification reactors, each graded short-cut nitrification reactor is internally provided with a plurality of partition boards, the partition boards divide the internal space of the graded short-cut nitrification reactor into a plurality of interval areas, and each interval area is internally provided with a water inlet area and a water outlet area;
one end of the partition board is fixedly connected to the inner wall of the grading short-cut nitrification reactor, the other end of the partition board is connected with a turning guide plate, and when the cultivation wastewater and sewage enter from one interval area to the other interval area, the cultivation wastewater and sewage enter from the turning guide plate.
3. A cultivation wastewater and sewage treatment process of the cultivation wastewater and sewage treatment apparatus as claimed in claim 1 or 2, comprising the steps of:
step S1, conveying the breeding waste to a dry-wet separator to perform dry-wet separation treatment on the mixture, and discharging dry waste residues into sludge compost;
s2, conveying the aquaculture wastewater generated after the dry-wet separation treatment to a preprocessor, carrying out hydrolysis adjustment and mixed precipitation treatment on the wastewater by the preprocessor, discharging part of low-purity nitrogen and phosphorus compounds into sludge compost, and conveying the rest part of aquaculture wastewater to a UASB reactor;
step S3, after entering the UASB reactor, the primary water distributor distributes the sludge layer in the UASB reactor for the first time, and meanwhile, the water inlet of the secondary water distributor guides the suspended sludge at the top of the suspended sludge layer to flow back to the bottom of the suspended sludge layer and then is sprayed out to form the second water distribution;
and S4, conveying the sludge discharged from the sludge discharge port of the UASB reactor into a multistage continuous short-cut nitrification reactor for nitrogen removal treatment, and discharging the sludge into sludge compost.
4. A aquaculture wastewater and sewage treatment process according to claim 3, wherein in step S3, the ratio of the reflux amount of the secondary water distributor to the water inflow amount of the primary water distributor is a reflux ratio of 2-2.5, the ratio of the water inflow amount of the secondary water distributor to the cross-sectional area of the suspended sludge layer is a surface hydraulic load of less than 0.6m 3 /m 2 ·h。
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