CN215975435U - Processing system of organic waste fermentation biogas slurry - Google Patents
Processing system of organic waste fermentation biogas slurry Download PDFInfo
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- CN215975435U CN215975435U CN202122346511.7U CN202122346511U CN215975435U CN 215975435 U CN215975435 U CN 215975435U CN 202122346511 U CN202122346511 U CN 202122346511U CN 215975435 U CN215975435 U CN 215975435U
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Abstract
The utility model relates to a treatment system for organic waste fermentation biogas slurry, which comprises a pretreatment unit, a biological nitrogen and carbon removal unit and a deep treatment unit which are sequentially arranged along the water flow direction; the pretreatment unit comprises a water conservancy screen, a rotary drum superfine grid, a regulating tank and a pressurized dissolved air floatation tank which are sequentially arranged along the water flow direction; the biological nitrogen and carbon removal unit comprises a primary AO nitrification and denitrification unit, a secondary AO nitrification and denitrification unit and an MBR membrane device which are sequentially arranged along the water flow direction; the MBR membrane device is provided with a sludge pump and an MBR membrane, wherein the sludge pump is used for pumping the activated sludge generated by the secondary AO nitrification and denitrification unit to the MBR membrane for filtration, and a sludge reflux mechanism used for returning the activated sludge intercepted by the MBR membrane to the primary AO nitrification and denitrification unit is arranged corresponding to the MBR membrane; the advanced treatment unit comprises a photocatalytic oxidation tank, a DN type denitrification biological filter and a CN type aeration biological filter which are sequentially arranged along the water flow direction.
Description
Technical Field
The utility model relates to a treatment system for organic waste fermentation biogas slurry. Is applicable to the technical field of environmental protection.
Background
Along with the rapid development of urban economy and society and the rapid improvement of the living standard of people, the collection amount of urban organic wastes is obviously increased, and the current domestic organic waste treatment level lags behind the overall development level of urban environment comprehensive improvement.
The organic waste has wide sources and large source amount in life, and the reasonable treatment can effectively reduce the environmental pollution caused by the organic waste. The main source of the organic waste is kitchen waste; crop straws such as rice straw, corn, beans, peanuts and the like; residual branches, fallen leaves, dried vines, weeds, shells and the like in the forestry production process; animal derived wastes (livestock and poultry manure such as cow manure, pig manure, sheep manure, and poultry manure); organic waste (bagasse, potato dregs, beet pulp, slaughter blood from meat processing industry, etc.) from agricultural and sideline processing industry.
The sewage of the organic waste treatment plant is mainly from biogas slurry obtained by dehydrating biogas residues generated after anaerobic fermentation of organic waste garbage, belongs to high-concentration organic wastewater, and has the main pollutant characterization values of CODcr and NH3N, SS, etc., and features high pollutant concentration, complex components and high ammonia nitrogen content. The sewage source is mainly biogas residue dehydration filtrateAnd the wastewater such as other process wastewater, flushing wastewater and the like in the plant area has low pollutant concentration, is homogenized and uniformly measured with high-concentration biogas slurry, and then enters a wastewater treatment station for treatment.
The existing common biogas slurry treatment process produced by anaerobic fermentation of organic wastes comprises the following steps: the pretreatment, biochemistry and advanced treatment are the main treatment processes, and the effluent standard is achieved. The pretreatment conventionally adopts an oil removal and air flotation process, the biochemical treatment adopts UASB + two-stage nitrification and denitrification + MBR, the advanced treatment adopts NF + RO, BOD, ammonia nitrogen and heavy metal in the ultrafiltration effluent subjected to the two-stage denitrification basically reach the discharge standard, the effluent has no suspended matters, but COD, total nitrogen and chromaticity formed by organic matters difficult to biochemically degrade still exceed the standard, and the nanofiltration and the reverse osmosis are adopted as the advanced treatment process, so that the organic pollution can be further removed. The combined treatment process of the wastewater has some defects which are mainly shown in the following aspects: (1) the power consumption is high, the membrane is frequently replaced, and the operating cost is high; (2) concentrated solution generated by membrane treatment is difficult to treat and easy to generate secondary pollution; (3) large investment and high operating cost; (4) UASB debugging and operation management are complicated, need to keep certain temperature, and the effect is unstable in winter.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: aiming at the existing problems, the system for treating the organic waste fermentation biogas slurry is provided to solve the problems of high investment cost, high operating cost and difficult treatment of concentrated solution generated by membrane treatment in the prior art.
The technical scheme adopted by the utility model is as follows: the utility model provides a processing system of organic waste fermentation natural pond liquid which characterized in that: comprises a pretreatment unit, a biological denitrification and carbon removal unit and an advanced treatment unit which are arranged in sequence along the water flow direction;
the pretreatment unit comprises a water conservancy screen, a rotary drum superfine grid, a regulating tank and a pressurized dissolved air floatation tank which are sequentially arranged along the water flow direction;
the biological nitrogen and carbon removal unit comprises a primary AO nitrification and denitrification unit, a secondary AO nitrification and denitrification unit and an MBR membrane device which are sequentially arranged along the water flow direction; the MBR membrane device is provided with a sludge pump and an MBR membrane, wherein the sludge pump is used for pumping the activated sludge generated by the secondary AO nitrification and denitrification unit to the MBR membrane for filtration, and a sludge reflux mechanism used for returning the activated sludge intercepted by the MBR membrane to the primary AO nitrification and denitrification unit is arranged corresponding to the MBR membrane;
the advanced treatment unit comprises a photocatalytic oxidation tank, a DN type denitrification biological filter and a CN type aeration biological filter which are sequentially arranged along the water flow direction.
The first-stage AO nitrification and denitrification unit comprises an ANAMMOX reaction tank and a first-stage nitrification tank which are sequentially arranged along the water flow direction, and a digestive juice reflux mechanism I is arranged between the first-stage nitrification tank and the ANAMMOX reaction tank.
The reflux ratio of the digestion solution between the first-stage nitrification tank and the ANAMMOX reaction tank reaches more than 800 percent.
And a biological selection pool for mixing the refluxed digestive juice with the refluxed sludge and the raw water is arranged at the front end of the ANAMMOX reaction pool.
The second-stage AO nitrification and denitrification unit comprises a second-stage denitrification tank and a second-stage nitrification tank which are sequentially arranged along the water flow direction, and a digestive juice reflux mechanism II is arranged between the second-stage nitrification tank and the second-stage denitrification tank.
The reflux ratio of the digestion liquid between the secondary nitrification tank and the secondary denitrification tank is more than 400 percent.
The photocatalytic oxidation tank is provided with an ultraviolet device and an ozone aeration device.
A treatment method of the treatment system for organic waste fermentation biogas slurry is characterized in that:
raw water enters a regulating tank after passing through a hydraulic screen mesh grid and a rotary drum superfine grid; adjusting the water quality and the water quantity of the high-concentration wastewater by using an adjusting tank, wherein the hydraulic retention time of the adjusting tank is 2-3 days, and the wastewater of the adjusting tank is pumped into a pressurized dissolved air floatation tank and then flows into a subsequent first-stage AO nitrification and denitrification unit;
the retention time of an ANAMMOX reaction tank in the first-stage AO nitrification and denitrification unit is designed to be 40-50 hours, the retention time of the first-stage nitrification and denitrification unit is designed to be 90-100 hours, and then the mixture flows into the subsequent second-stage AO nitrification and denitrification unit and the digestion liquid reflux mechanism I;
the residence time of a secondary denitrification tank in the secondary AO nitrification and denitrification unit is designed to be 20 hours, the residence time of the secondary nitrification tank is designed to be 20-30 hours, and then the water flows into a digestive juice reflux mechanism II;
the MBR membrane device conveys the activated sludge in the secondary nitrification tank to an MBR membrane through a sludge pump for filtering, the permeate is discharged to a subsequent photocatalytic oxidation tank, and the activated sludge intercepted by the micropores of the MBR membrane returns to the ANAMMOX reaction tank through a sludge reflux mechanism;
after being treated by photocatalytic oxidation in a photocatalytic oxidation tank, the wastewater enters a DN type denitrification biological filter and a CN type aeration biological filter, so that various indexes of treated effluent meet the discharge requirement.
The utility model has the beneficial effects that: according to the utility model, the organic waste fermentation biogas slurry is treated by the pretreatment unit, the biological denitrification and carbon removal unit and the advanced treatment unit in sequence, so that the investment and the operation cost are greatly reduced, the project with strict discharge standards can be realized, and the effluent quality, especially COD, ammonia nitrogen and total nitrogen, is greatly improved.
Drawings
Fig. 1 is a block diagram of the embodiment.
Detailed Description
As shown in fig. 1, the present embodiment is a system for treating organic waste fermented biogas slurry, which includes a pretreatment unit, a biological denitrification and carbon removal unit, and a deep treatment unit in sequence along a water flow direction.
The pretreatment unit comprises a hydraulic screen, a rotary drum ultrafine grid, a regulating tank and a pressurized dissolved air floatation tank which are sequentially arranged along the water flow direction, wherein the gap between the hydraulic screen and the grid is 3mm, the gap between the rotary drum ultrafine grid and the grid is 1mm, and particle suspended matters are mainly removed through two-stage filtration; the regulating tank regulates the water quality and the water quantity of the high-concentration wastewater, and the hydraulic retention time of the regulating tank is 2-3 days; the wastewater in the regulating tank is pumped into a pressurized dissolved air flotation tank, so that colloids, fine suspended matters, oils and the like in the wastewater are mainly removed, and the influence on the subsequent biological reactions such as nitrification and denitrification is reduced.
The biological nitrogen and carbon removal unit in the embodiment comprises a first-stage AO nitrification and denitrification unit, a second-stage AO nitrification and denitrification unit and an MBR membrane device which are sequentially arranged along the water flow direction.
In the embodiment, the first-stage AO nitrification and denitrification unit comprises an ANAMMOX reaction tank and a first-stage nitrification tank which are sequentially arranged along the water flow direction, and the retention time of the ANAMMOX reaction tank is designed to be 40-50 hours; the first-stage nitrification residence time is designed to be 90-100 hours, a nitrification liquid reflux mechanism I for refluxing the digestive juice to the ANAMMOX reaction tank is arranged in the first-stage nitrification residence time, and the nitrification liquid reflux ratio reaches more than 800%. A mechanical stirrer is arranged in the ANAMMOX reaction tank, a jet aerator is arranged in the nitrification tank, and the sewage flows into a subsequent two-stage AO nitrification and denitrification unit through gravity.
In the embodiment, the secondary AO nitrification and denitrification unit comprises a secondary denitrification tank and a secondary nitrification tank which are sequentially arranged along the water flow direction, and the retention time of the secondary denitrification is designed to be 20 hours; the residence time of the secondary nitrification is designed to be 20-30 hours, a nitrification liquid reflux mechanism II for refluxing the digestive juice to the secondary denitrification tank is arranged in the secondary nitrification tank, and the reflux ratio of the nitrification liquid reaches more than 400%.
The embodiment aims at strict standard emission standard of total nitrogen, adopts a secondary denitrification and nitrification process on the basis of a single-stage biochemical denitrification process, and ensures the completeness and stability of biochemical denitrification by carrying out deep denitrification reaction on residual ammonia nitrogen, nitrate nitrogen and nitrite nitrogen in an ANAMMOX reaction tank and a nitrification process in the secondary denitrification and secondary nitrification reaction when the ANAMMOX reaction tank and the primary nitrification denitrification are incomplete.
The high-activity aerobic microorganisms can be cultured under the condition of jet blast aeration, so that biochemically degradable organic pollutants in the sewage are almost completely degraded in the nitrification tank, ammonia nitrogen and organic nitrogen are oxidized into nitrate, and thalli (activated sludge) and purified water are completely separated by the ultrafiltration membrane, so that microbial flora generated by continuous domestication in a biochemical system is propagated, organic matters which are difficult to degrade in the leachate relative to a common sewage treatment process can be gradually degraded, and high-quality effluent quality can be obtained. The ultrafiltration inlet water has a reflux function, namely clear liquid is discharged after ultrafiltration concentration of the ultrafiltration inlet water, concentrated solution flows back to the denitrification tank and is reduced into nitrogen gas in an anoxic environment to be discharged, the aim of denitrification is fulfilled, and a stirring device is arranged in the denitrification tank.
MBR membrane device has sludge pump and MBR membrane in this embodiment, and the activated sludge pump that nitrifies in the denitrification unit with second grade AO through the sludge pump sends to the MBR membrane filtration, corresponds the MBR membrane and is equipped with the mud return mechanism that is used for returning the activated sludge that the MBR membrane was held back to ANAMMOX reaction tank, and the activated sludge who is held back by the micropore of milipore filter then returns ANAMMOX reaction tank in order to improve mud concentration in the pond, continues to carry out biological treatment. Compared with the traditional biochemical treatment process, the microbial thallus is separated from the effluent, the microbes and suspended matters are retained in the system, and the effluent is sterile and free of suspended matters.
In the embodiment, the biological selection tank is arranged at the front end of the ANAMMOX reaction tank, and the returned nitrifying liquid, the returned sludge and the raw water are fully mixed to prevent the sludge from expanding. Partial nitrification is carried out to generate nitroso nitrogen, and the generated nitroso nitrogen and ammonia nitrogen directly react under the action of ANAMMOX microorganisms to generate nitrogen gas so as to remove the ammonia nitrogen.
In this embodiment, the advanced treatment unit comprises a photocatalytic oxidation tank, a DN type denitrification biological filter and a CN type aeration biological filter which are sequentially arranged along the water flow direction. The photocatalytic oxidation tank is provided with an ozone aeration device and an ultraviolet device, and the precipitation time is 1-2 hours. The denitrification volume load of the DN type denitrification biological filter and the CN type aeration biological filter is maintained at 0.25kgNO3 --N/(m3D), the empty bed hydraulic retention time is 7h and 4h respectively, and the matched equipment comprises: comprises a water distribution and bearing system, a back-flushing gas distribution system, a back-flushing water distribution system, a filler anti-blocking device and the like.
For the wastewater after long-time biochemical treatment, the residual organic matters are soluble organic matters which are extremely difficult to biodegrade, and for the organic matters, the most common treatment method is photocatalytic oxidation. After photocatalytic oxidation treatment, COD and chroma are greatly reduced, the biodegradability of sewage is improved, and organic matters which are difficult to degrade are converted into organic matters which are easy to biodegrade; the effluent enters a DN type denitrification biological filter and a CN type aeration biological filter, the sections are an anoxic denitrification section and an aerobic nitrification section, all indexes of the treated effluent meet the discharge requirement through the interception, adsorption and biodegradation of filter materials, COD is not more than 300mg/L through advanced treatment, and TN is not more than 50 mg/L.
In this example, the amount of organic waste biogas to be treated is about 900 tons/day, and the treatment method is as follows:
raw water enters a regulating tank after passing through a hydraulic screen mesh grid and a rotary drum superfine grid, and particle suspended matters and the like are mainly removed; adjusting the water quality and the water quantity of high-concentration wastewater by using an adjusting tank, wherein the hydraulic retention time of the adjusting tank is 2-3 days, and pumping the wastewater of the adjusting tank into a pressurized dissolved air flotation tank to mainly remove colloids, fine suspended matters, oils and the like in the wastewater, reduce the influence on the subsequent biological reactions such as nitrification and denitrification and the like, and then flowing into a subsequent ANAMMOX reaction tank;
the retention time of an ANAMMOX reaction tank in the first-stage AO nitrification and denitrification unit is designed to be 40-50 hours, the retention time of the first-stage nitrification and denitrification unit is designed to be 90-100 hours, and then the mixture flows into the subsequent second-stage AO nitrification and denitrification unit and the digestion liquid reflux mechanism I;
the residence time of a secondary denitrification tank in the secondary AO nitrification and denitrification unit is designed to be 20 hours, the residence time of the secondary nitrification tank is designed to be 20-30 hours, and then the water flows into a digestive juice reflux mechanism II;
the MBR membrane device conveys the activated sludge in the secondary nitrification tank to an MBR membrane through a sludge pump for filtering, the permeate is discharged to a subsequent photocatalytic oxidation tank, and the activated sludge intercepted by the micropores of the MBR membrane returns to the ANAMMOX reaction tank through a sludge reflux mechanism;
after being treated by photocatalytic oxidation in a photocatalytic oxidation tank, the wastewater enters a DN type denitrification biological filter and a CN type aeration biological filter, so that various indexes of treated effluent meet the discharge requirement.
The water quality of inlet and outlet water is shown in table 1:
the removal effect of each processing unit design is shown in table 2:
engineering design:
(1) a pretreatment unit: an adjusting tank is arranged to store the biogas slurry and the production and domestic wastewater which are filtered by the grating, so as to provide water quantity adjustment for the rear-end process, and an accident tank is arranged to store accident water and all adopt an all-underground steel concrete structure. The air floatation tank adopts integrated equipment, and the subsequent biochemical treatment effect of the biogas slurry is enhanced after fine suspended solids SS are removed.
The pretreatment stage design parameters are as in table 3:
(2) the high-efficiency biological denitrification and carbon removal unit comprises: mainly comprises a 2-stage A/O pool and an MBR membrane device. 2 series of the two-stage A/O tanks are designed to operate independently, the two-stage A/O tanks are all of reinforced concrete structures, the total residence time of the denitrification A tank is 67 hours, the total residence time of the nitrification O tank is 126 hours, and the total residence time of the biochemical treatment section is 193 hours, which is about 8 days. The denitrification A tank adopts mechanical stirring, the nitrification O tank adopts jet aeration, and is matched with a jet aeration stirring system, a nitrate reflux pump and a defoaming agent adding device, and meanwhile, a cooling system is matched to avoid the influence of heat generated by a biochemical system and overhigh water temperature in summer. The external ultrafiltration device adopts a cross-flow tubular ultrafiltration membrane component, adopts standardized design, is easy to disassemble and maintain, can easily inspect and maintain any filter membrane and other components by opening the membrane component, is simple to maintain, and allows a few membranes and flow guide discs to be installed when the number of parts is not enough, without influencing the use of the ultrafiltration membrane component.
The design parameters of the high-efficiency biological denitrification and carbon removal unit are shown in the table 4:
(3) a depth processing unit:
the deep treatment of the project adopts the technology of photocatalytic oxidation, DN type denitrification biological filter and CN type aeration biological filter. Firstly, COD and chroma are greatly reduced under the action of a catalyst and ultraviolet light, the biodegradability of sewage is improved, organic matters which are difficult to degrade are converted into organic matters which are easy to biodegrade, macromolecular organic matters which are difficult to degrade are further oxidized to generate carbon dioxide and water or are converted into micromolecular organic matters, and therefore the chroma in the sewage is obviously reduced while the biodegradability of the sewage is improved; and then, a DN type denitrification biological filter and a CN type aeration biological filter are utilized, wherein the sections are an anoxic denitrification section and an aerobic nitrification section, and all indexes of treated effluent meet the discharge requirement through the interception, adsorption and biodegradation of filter materials. The COD of the effluent after advanced treatment is less than or equal to 300mg/L, and the TN is less than or equal to 50 mg/L.
The photocatalytic oxidation tank is provided with an ozone aeration device and an ultraviolet device, and the precipitation time is 1-2 hours. The DN type denitrification biological filter and the CN type aeration biological filter have the denitrification volume load maintained at 0.25kgNO 3-N/(m 3 d), and the hydraulic retention time of the empty bed is 7h and 4h respectively. The corollary equipment: comprises a water distribution and bearing system, a back-flushing gas distribution system, a back-flushing water distribution system, a filler anti-blocking device and the like.
Analyzing the operation cost: the direct operation cost of the whole system is lower, about 25 yuan/ton, and the main operation cost is on the electricity cost and the medicament cost.
Under the condition that the effluent standard is strict, especially under the condition that the discharge index of COD and TN is strict, the embodiment ensures that the effluent is stable and reaches the standard, and the operation is stable, the whole combined treatment process has small floor area, less investment, low operation cost and wide application range, and can be also suitable for the sewage treatment fields of other high-ammonia nitrogen and high-organic-matter concentration, such as kitchen anaerobic fermentation wastewater, cultivation anaerobic fermentation wastewater, waste water from tail vegetable anaerobic fermentation, coking wastewater, garbage percolate and the like.
Claims (7)
1. The utility model provides a processing system of organic waste fermentation natural pond liquid which characterized in that: comprises a pretreatment unit, a biological denitrification and carbon removal unit and an advanced treatment unit which are arranged in sequence along the water flow direction;
the pretreatment unit comprises a water conservancy screen, a rotary drum superfine grid, a regulating tank and a pressurized dissolved air floatation tank which are sequentially arranged along the water flow direction;
the biological nitrogen and carbon removal unit comprises a primary AO nitrification and denitrification unit, a secondary AO nitrification and denitrification unit and an MBR membrane device which are sequentially arranged along the water flow direction; the MBR membrane device is provided with a sludge pump and an MBR membrane, wherein the sludge pump is used for pumping the activated sludge generated by the secondary AO nitrification and denitrification unit to the MBR membrane for filtration, and a sludge reflux mechanism used for returning the activated sludge intercepted by the MBR membrane to the primary AO nitrification and denitrification unit is arranged corresponding to the MBR membrane;
the advanced treatment unit comprises a photocatalytic oxidation tank, a DN type denitrification biological filter and a CN type aeration biological filter which are sequentially arranged along the water flow direction.
2. The system for treating organic waste fermentation biogas slurry according to claim 1, characterized in that: the first-stage AO nitrification and denitrification unit comprises an ANAMMOX reaction tank and a first-stage nitrification tank which are sequentially arranged along the water flow direction, and a digestive juice reflux mechanism I is arranged between the first-stage nitrification tank and the ANAMMOX reaction tank.
3. The system for treating organic waste fermentation biogas slurry as claimed in claim 2, wherein: the reflux ratio of the digestion solution between the first-stage nitrification tank and the ANAMMOX reaction tank reaches more than 800 percent.
4. The system for treating organic waste fermentation biogas slurry as claimed in claim 2, wherein: and a biological selection pool for mixing the refluxed digestive juice with the refluxed sludge and the raw water is arranged at the front end of the ANAMMOX reaction pool.
5. The system for treating organic waste fermentation biogas slurry according to claim 1, characterized in that: the second-stage AO nitrification and denitrification unit comprises a second-stage denitrification tank and a second-stage nitrification tank which are sequentially arranged along the water flow direction, and a digestive juice reflux mechanism II is arranged between the second-stage nitrification tank and the second-stage denitrification tank.
6. The system for treating organic waste fermentation biogas slurry according to claim 5, characterized in that: the reflux ratio of the digestion liquid between the secondary nitrification tank and the secondary denitrification tank is more than 400 percent.
7. The system for treating organic waste fermentation biogas slurry according to claim 1, characterized in that: the photocatalytic oxidation tank is provided with an ultraviolet device and an ozone aeration device.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115304223A (en) * | 2022-08-29 | 2022-11-08 | 南京中船绿洲环保有限公司 | Integrated treatment device and treatment method for deep denitrification of garbage penetration filtrate |
| CN116606043A (en) * | 2023-07-19 | 2023-08-18 | 天津高能时代水处理科技有限公司 | Full quantification treatment method and system for percolate |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115304223A (en) * | 2022-08-29 | 2022-11-08 | 南京中船绿洲环保有限公司 | Integrated treatment device and treatment method for deep denitrification of garbage penetration filtrate |
| CN116606043A (en) * | 2023-07-19 | 2023-08-18 | 天津高能时代水处理科技有限公司 | Full quantification treatment method and system for percolate |
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