CN114180721A - Breeding wastewater and sewage treatment device and technology - Google Patents
Breeding wastewater and sewage treatment device and technology Download PDFInfo
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- CN114180721A CN114180721A CN202111592489.2A CN202111592489A CN114180721A CN 114180721 A CN114180721 A CN 114180721A CN 202111592489 A CN202111592489 A CN 202111592489A CN 114180721 A CN114180721 A CN 114180721A
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- 239000010865 sewage Substances 0.000 title claims abstract description 43
- 239000002351 wastewater Substances 0.000 title claims abstract description 42
- 238000009395 breeding Methods 0.000 title claims description 7
- 230000001488 breeding effect Effects 0.000 title claims description 7
- 238000005516 engineering process Methods 0.000 title description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 165
- 239000010802 sludge Substances 0.000 claims abstract description 144
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000009360 aquaculture Methods 0.000 claims abstract description 22
- 244000144974 aquaculture Species 0.000 claims abstract description 22
- 238000005192 partition Methods 0.000 claims description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
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- 239000000203 mixture Substances 0.000 claims description 4
- 150000003018 phosphorus compounds Chemical class 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 238000009280 upflow anaerobic sludge blanket technology Methods 0.000 claims 9
- 239000002893 slag Substances 0.000 claims 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 13
- 239000011574 phosphorus Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 5
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
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- 238000006243 chemical reaction Methods 0.000 description 5
- 239000007789 gas 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
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- 241001453382 Nitrosomonadales Species 0.000 description 2
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- 102000004190 Enzymes Human genes 0.000 description 1
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- 244000005700 microbiome Species 0.000 description 1
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- 229910052760 oxygen Inorganic materials 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
- 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
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a culture wastewater and sewage treatment device which comprises a UASB (upflow anaerobic sludge blanket) 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 suspended sludge at the top of the suspended sludge layer is guided by a water inlet of the secondary water distributor to flow back to the bottom of the suspended sludge layer to be sprayed out. The invention also discloses a culture wastewater and sewage treatment process. According to the aquaculture wastewater and sewage treatment device and the aquaculture wastewater and sewage treatment process disclosed by the invention, the collision and friction among granular sludge can be improved through the backflow generated by the secondary water distributor in the UASB reactor, the activity of the granular sludge is improved, the granulation speed of suspended sludge is accelerated, the total phosphorus concentration is adjusted, the addition of chemical phosphorus removal agents is reduced, and the process energy consumption is reduced.
Description
Technical Field
The invention relates to the technical field of aquaculture wastewater treatment, in particular to an aquaculture wastewater and sewage treatment device and process.
Background
At present, as the treatment requirement of livestock and poultry feces is higher and higher, the national management and control force is continuously increased, and the feces treatment aiming at the large-scale breeding plant gradually becomes the core problem restricting the breeding development. The traditional fecal sewage treatment process comprises an UASB (Up flow Anaerobic Sludge Bed reactor), a hydrolytic acidification SBR (sequencing batch reactor activated Sludge process)/an AAO (Anaerobic-Oxic-Anoxic-aerobic process) and the like, is suitable for meeting the discharge requirements of the Farmland irrigation Water quality standard or the livestock and poultry Breeding pollutant discharge standard, has new requirements on the scale breeding sewage discharge and pollution discharge limit along with the improvement of the national ecological environment quality standard, and the traditional process can not meet the treatment capacities of COD (Chemical Oxygen Demand), total nitrogen and total phosphorus, so that a low-cost high-efficiency treatment device and a process which can meet the deep treatment of nitrogen and phosphorus are urgently needed to solve the problems.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the invention provides a cultivation wastewater and sewage treatment device and process 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 the UASB reactor and the multistage short distance nitration reactor in succession through the pipe connection, the UASB reactor is including setting up at its inside water distributor and secondary water distributor, be formed with sludge blanket and suspension sludge blanket in the UASB reactor, water distributor set up in the sludge blanket is in order to direct rivers sludge blanket bottom, the secondary water distributor sets up suspension sludge blanket, the water inlet of secondary water distributor will suspension sludge blanket top guide flow back to suspension sludge blanket's bottom is spout again.
Preferably, the secondary water distributor comprises a water inlet, a pipeline pump and a water distribution mechanism, the water inlet is located in the suspended sludge layer, the water inlet and the water distribution mechanism are connected 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 sprays the suspended sludge.
Preferably, the water inlet is arranged opposite to the air outlet of the UASB reactor and is positioned under the air outlet.
Preferably, the water distribution mechanism comprises a water inlet main pipe connected to the pipeline pump, and at least one water outlet branch pipe connected to the water inlet main pipe.
Preferably, the water outlet branch pipes are uniformly distributed in the circumferential direction.
Preferably, a plurality of water outlet holes are formed in the water outlet branch pipe, and a plug is arranged at one end, far away from the water inlet main pipe, of the water outlet branch pipe.
Preferably, the primary water distributor comprises a lift pump connected with a water inlet tank and a water distribution port connected with the lift pump through a pipeline, and the water distribution port is positioned at a sludge outlet of the UASB reactor.
Preferably, the multistage continuous short-cut nitrification reactor comprises a plurality of graded short-cut nitrification reactors, a plurality of partition plates are arranged in each graded short-cut nitrification reactor, the partition plates divide the internal space of the graded short-cut nitrification reactor into a plurality of partition areas, and a water inlet area and a water outlet area are arranged in each partition 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 the turning guide plate, and the aquaculture wastewater and sewage enters from the turning guide plate when passing from one interval area to the other interval area.
A cultivation wastewater and sewage treatment process comprises the following steps:
step S1, conveying the culture manure to a dry-wet separator to perform dry-wet separation treatment on the mixture, and discharging dry manure residues into sludge compost;
step S2, conveying the aquaculture wastewater and sewage generated after the dry-wet separation treatment to a preprocessor, wherein after the preprocessor carries out hydrolysis regulation and mixed precipitation treatment on the wastewater and sewage, a part of low-purity nitrogen and phosphorus compounds are discharged into sludge compost, and the other part of aquaculture wastewater and sewage is conveyed to a UASB reactor;
step S3, after entering a UASB reactor, a primary water distributor distributes water for the first time on a sludge layer in the UASB reactor, and simultaneously, a water inlet of a secondary water distributor guides suspended sludge at the top of the suspended sludge layer to flow back to the bottom of the suspended sludge layer and then sprays the suspended sludge to form secondary water distribution;
and step S4, conveying the sludge discharged from the sludge discharge port of the UASB reactor into the multistage continuous short-cut nitrification reactor for denitrification treatment, and then discharging the sludge into sludge compost.
Preferably, in step S3, the ratio of the water return of the secondary water distributor to the water inlet of the primary water distributor is a water return ratio, the water return ratio is 2-2.5, the ratio of the water inlet 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 0.6m3/m2·h。
The device and the process for treating the aquaculture wastewater and the sewage provided by the embodiment of the invention have the following effects:
1. after the sludge at the bottom of the sludge layer is stirred by 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 then sprayed out to form secondary backflow, as a large amount of granular sludge and zoogloea are suspended in the suspended sludge layer, the granular sludge can maximize the treatment efficiency only by regularly 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 among 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 addition of chemical phosphorus removal agents and reducing the energy consumption in the process;
2. the improved UASB reactor is combined with a multistage continuous short-cut nitrification reactor for treatment, so that the aeration quantity is saved, and the efficiency of removing ammonia nitrogen and total phosphorus is obviously improved;
3. the medium temperature in the UASB reactor is anaerobic, the reaction efficiency is improved, and the active effect on removing ammonia nitrogen is achieved;
4. through multistage continuous grading short-cut nitration reaction, the total nitrogen removal efficiency is improved, and more alkalinity is automatically supplemented to a biochemical reaction system, so that an additional carbon source is reduced, and the medicament cost is saved.
Drawings
FIG. 1 is a schematic structural view 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 plant shown in FIG. 1;
FIG. 3 is a schematic structural diagram of the multistage continuous short-cut nitrification 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 partial schematic view of another angle of the secondary water distributor shown in FIG. 4;
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 obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Please refer to fig. 1-5. This breed waste water sewage treatment plant includes through pipe connection's dry wet separator, preprocessor, UASB reactor 3 and multistage continuous short distance nitration reactor, breeds waste water sewage and passes through in proper order dry wet separator carries out dry wet separation processing, process the preprocessor is hydrolysised and is adjusted and coagulating sedimentation handles, process the UASB reactor carries out anaerobic treatment, process multistage continuous short distance nitration reactor carries out the denitrogenation and handles.
Specifically, the dry-wet separation adopts an inclined screen type dry-wet separator, and the preprocessor adopts hydrolysis regulation and coagulating sedimentation. Wherein, the pretreatment and the dry-wet separation are two processes, the hydrolysis adjustment retention time is longer than 4 days, and the hydrolysis acidification function and the adjustment capability are realized. The enzyme released by hydrolytic bacteria and acid-producing bacteria makes the macromolecular substance difficult to be biodegraded in water produce biocatalysis reaction, which is specifically expressed as chain scission and water dissolution, and the microorganism utilizes the water-soluble substrate to complete intracellular biochemical reaction and discharge various organic acids. The pH value is adjusted by adding sodium carbonate before entering the UASB reactor, and the pH value is more than 7. The specific pH value is controlled to be 7.2-8.5.
The UASB reactor 3 is used for carrying out anaerobic treatment on the aquaculture wastewater and sewage. UASB reactor 3 is including setting up at its inside primary water-locator 31 and secondary water-locator 33, there are sludge blanket 35 and suspension sludge blanket 37 in the UASB reactor 3, primary water-locator 31 set up in sludge blanket 35 leads to with the rivers in the case 8 of will intaking sludge blanket 35 bottom, on the one hand, prevents the short-term current, reduces the inhomogeneous phenomenon of water distribution. 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 work of the secondary water distributor 33.
The secondary water distributor 33 is arranged on the suspended sludge layer 37, and the suspended sludge on the top of the suspended sludge layer 37 is guided by the water inlet of the secondary water distributor 33 to flow back to the bottom of the suspended sludge layer 37 and then sprayed out to form secondary return. Because a large amount of granular sludge and zoogloea are suspended in the suspended sludge layer 37, the granular sludge needs to be periodically peeled off to remove dead sludge on the outer surface so as to maximize the treatment efficiency, and the secondary reflux in the middle of the UASB reactor can improve the collision and friction among the granular sludge, thereby being beneficial to improving the activity of the granular sludge.
It should be noted that, still be connected with gas collecting device 6 and gas processing system 7 on the UASB reactor, the UASB reactor carries out first degradation to COD, and the marsh gas that produces in the degradation process passes through the top setting gas collecting device 6 shifts to gas processing system 7, secondary water-locator 33 adopts the water distribution mode of lower income upper outlet to utilize marsh gas energy source to heat the heat preservation to the UASB reactor. In the process, because a large amount of suspended matters are hydrolyzed into soluble substances, macromolecules are degraded into micromolecules, and BOD of effluent water5/CODcrThe 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, the water inlet 331 is located 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 return water distribution. Since the suspended sludge blanket 37 is the core of the UASB reactor in the anaerobic reaction, the thickness of the suspended sludge blanket 37, the formation of granular sludge and the biomass are the key points for ensuring the reaction effect. The secondary reflux water distribution suspended sludge layer 37 is stirred, and the collision and friction among granular sludge in the suspended sludge layer 37 are favorable for improving the activity of the granular sludge to be granulated quickly.
The water inlet 331 is opposite to the air outlet 10 (i.e. the biogas outlet) of the UASB reactor, and is located under the air outlet 10. Therefore, the methane generated by the water inlet can be quickly discharged to the air outlet and enters 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 of the water outlet pipes sprays the returned suspended sludge outwards. Specifically, in this embodiment, the water outlet branch pipes are a plurality of pipes uniformly distributed in the circumferential direction. Preferably, in this embodiment, the number of the outlet branch pipes is 6.
A plurality of water outlet holes are formed in the water outlet branched pipe 337, and a plug 338 is arranged at one end, far away from the water inlet main pipe, of the water outlet branched pipe. The suspended sludge in the suspended sludge layer 37 is discharged from the water outlet holes and is used for stirring the suspended sludge in the suspended sludge layer 37, and suspended sludge particles collide and rub to accelerate the formation of the particles.
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 via a pipe, the water distribution port being located at a sludge outlet of the UASB reactor. The lift pump 311 pumps the water flow in the water inlet tank 8 to the water distribution port 313, the water distribution port spun water flow stirs the sludge of the UASB reactor, on one hand, the phenomenon of short flow of the sludge outlet is prevented, on the other hand, the movement of the sludge blanket is accelerated, the generation of the suspended sludge blanket 37 is accelerated, and a condition is provided for the secondary water distributor 33 to process the operation of granulating the suspended sludge blanket 37.
As shown in fig. 3, the multistage continuous short-cut nitrification reactor comprises a plurality of graded short-cut nitrification reactors 5, specifically, in the present embodiment, three graded short-cut nitrification reactors are provided. The three graded shortcut nitrification reactors form three-level 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 partition areas, and a water inlet area and a water outlet area are arranged in each partition area. The water flow direction and the reflux direction of the graded short-cut nitration reactor are shown in figure 3.
As shown in fig. 1, there are a plurality of partition boards 51, specifically, in this embodiment, there are 6 partition boards 51, and 6 partition boards 51 divide the internal space atmosphere of the short-cut nitrification reactor into a plurality of partitioned areas. A water inlet area and a water outlet area are formed in the partition 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 53, and the aquaculture wastewater and sewage enter from the turning guide plate when passing from one partition area to the other partition area. 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 a flow guiding dead zone.
As shown in fig. 3, three of the graded shortcut nitrification reactors respectively form a three-stage shortcut nitrification treatment process of three-stage reflux, from the third stage reflux to the second stage reflux, from the second stage reflux to the first stage reflux, 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 the removal of nitrogen, so that the method is a simple denitrification way. The process has the advantages of no consumption of organic carbon source, low sludge yield, low aeration rate, etc.
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 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, preprocessing: breed waste water sewage that produces after will doing wet-separating processing is carried to preprocessor, preprocessor carries out the processing back that the regulation of hydrolysising and mixed sediment to waste water sewage, discharges to the mud compost after obtaining partly low-purity nitrogen phosphorus compound, and the waste water sewage is bred to another part that obtains carries to UASB reactor.
Step S3, UASB process: after entering the UASB reactor, the primary water distributor 31 distributes the sludge in the UASB reactor for the first time to stir the sludge at the sludge outlet, and simultaneously, 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 suspended sludgeThe bottom of the floating sludge layer 37 is sprayed to form 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 quantity of the primary water distributor 31 is a reflux ratio, the reflux ratio is 2-2.5, the ratio of the water inflow quantity of the secondary water distributor 33 to the sectional area of the suspended sludge layer 37 is a surface hydraulic load, and the surface hydraulic load is less than 0.6m3/m2H, favoring the formation of granular sludge.
Step S4, short-cut nitrification: sludge discharged from a sludge discharge port of the UASB reactor is conveyed to a multistage continuous short-cut nitrification reactor to be denitrified, and then the residual sludge is discharged into sludge compost to be used as organic fertilizer, so that the resource utilization is improved, and the treated residual sewage reaches the discharge standard. Part of ammonia nitrogen in the multistage shortcut nitrification reactor is firstly converted into nitrite nitrogen through ammonia oxidizing bacteria, and the rest ammonia nitrogen and nitrite nitrogen are converted into nitrogen to realize the removal of nitrogen, so that the method is a simple denitrification way. The process has the advantages of no consumption of organic carbon source, low sludge yield, low aeration rate, etc.
The mode of combining the multistage continuous short-cut nitrification reactor with the UASB reactor ensures that the C/N (carbon-nitrogen ratio) ratio is more reasonable to be distributed, and the COD can be stably reduced to be below 100 mg/L;
typical water quality indexes of inlet water are as follows: 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 removing ammonia nitrogen and total phosphorus by combining the improved UASB reactor and the multistage continuous short-cut nitrification reactor is obviously improved, and more alkalinity is automatically supplied to the biochemical reaction system, so that the additional carbon source is reduced, and the medicament cost is saved.
The device and the process for treating the aquaculture wastewater and the sewage provided by the embodiment of the invention have the following effects:
1. after the sludge at the bottom of the sludge layer is stirred by 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 then sprayed out to form secondary backflow, as a large amount of granular sludge and zoogloea are suspended in the suspended sludge layer, the granular sludge can maximize the treatment efficiency only by regularly 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 among 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 addition of chemical phosphorus removal agents and reducing the energy consumption in the process;
2. the improved UASB reactor is combined with a multistage continuous short-cut nitrification reactor for treatment, so that the aeration quantity is saved, and the efficiency of removing ammonia nitrogen and total phosphorus is obviously improved;
3. the medium temperature in the UASB reactor is anaerobic, the reaction efficiency is improved, and the active effect on removing ammonia nitrogen is achieved;
4. through multistage continuous grading short-cut nitration reaction, the total nitrogen removal efficiency is improved, and more alkalinity is automatically supplemented to a biochemical reaction system, so that an additional carbon source is reduced, and the medicament cost is saved.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The utility model provides a breed waste water sewage treatment plant, its characterized in that includes UASB reactor and multistage short distance nitration reactor in succession through the pipe connection, the UASB reactor is including setting up at its inside water distributor and secondary water distributor, be formed with sludge blanket and suspension sludge blanket in the UASB reactor, water distributor set up in the sludge blanket is in order to lead rivers to sludge blanket bottom, the secondary water distributor sets up suspension sludge blanket, the water inlet of secondary water distributor will the suspension mud at suspension sludge blanket top guides the backward flow to the bottom of suspension sludge blanket is spout again.
2. The aquaculture wastewater and sewage treatment device of claim 1, wherein the secondary water distributor comprises a water inlet, a pipeline pump and a water distribution mechanism, the water inlet is located in the suspended sludge layer, the water inlet and the water distribution mechanism are connected 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 sprays the suspended sludge.
3. The aquaculture wastewater and sewage treatment device of claim 2, wherein the water inlet is arranged opposite to the air outlet of the UASB reactor and is positioned right below the air outlet.
4. The aquaculture wastewater and sewage treatment apparatus of claim 2, wherein the water distribution mechanism comprises a main water inlet pipe connected to the pipe pump, and at least one branch water outlet pipe connected to the main water inlet pipe.
5. The aquaculture wastewater and sewage treatment device of claim 4, wherein the water outlet branch pipes are uniformly distributed in the circumferential direction.
6. The aquaculture wastewater and sewage treatment device of claim 4, wherein the water outlet branch pipe is provided with a plurality of water outlet holes, and a plug is arranged at one end of the water outlet branch pipe, which is far away from the water inlet main pipe.
7. The aquaculture wastewater and sewage treatment device of claim 1, wherein the primary water distributor comprises a lift pump connected with a water inlet tank and a water distribution port connected with the lift pump through a pipeline, and the water distribution port is positioned at a sludge outlet of the UASB reactor.
8. The aquaculture wastewater and sewage treatment device of claim 1, wherein the multistage continuous short-cut nitrification reactor is composed of a plurality of grading short-cut nitrification reactors, a plurality of partition plates 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 partition areas, and a water inlet area and a water outlet area are arranged in each partition 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 the turning guide plate, and the aquaculture wastewater enters from the turning guide plate when passing from one interval area to the other interval area.
9. A cultivation wastewater and sewage treatment process is characterized by comprising the following steps:
step S1, conveying the breeding excrement to a dry-wet separator to perform dry-wet separation treatment on the mixture, and discharging dry excrement slag into sludge compost;
step S2, conveying the aquaculture wastewater and sewage generated after the dry-wet separation treatment to a preprocessor, wherein after the preprocessor carries out hydrolysis regulation and mixed precipitation treatment on the wastewater and sewage, a part of low-purity nitrogen and phosphorus compounds are discharged into sludge compost, and the other part of aquaculture wastewater and sewage is conveyed to a UASB reactor;
step S3, after entering a UASB reactor, a primary water distributor distributes water for the first time on a sludge layer in the UASB reactor, and simultaneously, a water inlet of a secondary water distributor guides suspended sludge at the top of the suspended sludge layer to flow back to the bottom of the suspended sludge layer and then sprays the suspended sludge to form secondary water distribution;
and step S4, conveying the sludge discharged from the sludge discharge port of the UASB reactor into the multistage continuous short-cut nitrification reactor for denitrification treatment, and then discharging the sludge into sludge compost.
10. The aquaculture wastewater and sewage treatment process of claim 9, wherein in step S3, the ratio of the return flow of the secondary water distributor to the water inlet of the primary water distributor is a return flow ratio, the return flow ratio is 2-2.5, the ratio of the water inlet 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 0.6m3/m2·h。
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