CN114436467A - Integrated device and method for treating leachate of garbage transfer station - Google Patents
Integrated device and method for treating leachate of garbage transfer station Download PDFInfo
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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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
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
Abstract
The invention discloses a garbage transfer station leachate treatment integrated device which comprises a pretreatment unit, a biochemical treatment unit and a sludge treatment unit, wherein the pretreatment unit comprises an adjusting tank, a reaction tank and an air floatation tank, the outlet of the adjusting tank is connected with the inlet of the reaction tank, and the outlet of the reaction tank is connected with the inlet of the air floatation tank; the biochemical treatment unit comprises an MABR tank, an MBBR tank and an MBR tank, wherein the outlet of the air floatation tank is connected with the inlet of the MABR tank, the outlet of the MABR tank is connected with the inlet of the MBBR tank, the outlet of the MBBR tank is connected with the MBR tank, and the first outlet of the MBR tank is connected with the inlet of the MABR tank; the sludge treatment unit comprises a sludge concentration tank and a sludge dewatering machine. The invention also discloses a method for treating the leachate of the garbage transfer station. The method adopts the MABR, MBBR and MBR combined process as a method for removing leachate organic matters, ammonia nitrogen and total nitrogen in the garbage transfer station, and is safe and efficient; the integrated processing device has the advantages of high integration degree, small occupied area and convenience in installation.
Description
Technical Field
The invention relates to the field of leachate treatment, in particular to a leachate treatment integrated device and method for a garbage transfer station.
Background
The garbage transfer station is an indispensable link in a garbage collection and transportation disposal system of urban domestic garbage, and is an important hub for garbage collection and disposal, and garbage is mechanically compressed in the transfer station and then transported to a terminal disposal system by a garbage truck. The garbage transfer station can produce a certain amount of garbage leachate in the processes of garbage filling, compression and transfer, and according to statistics, the waste water yield of the garbage transfer station is about 10% of the garbage transfer amount. The rubbish transfer station leachate pollutant composition is complicated changeable, and pollutant concentrations such as organic matter, ammonia nitrogen, grease are higher, nevertheless because rubbish dwell time is short in the transfer station, in addition there is the dilution that washes waste water, and the leachate pollutant concentration of transfer station is lower than the leachate of landfill, msw incineration power plant, and the biodegradability is better. The sewage discharge of the transfer station is discharged into an urban sewage pipe network after being pretreated according to relevant requirements or discharged after being independently treated to reach the standard, and the on-site treatment of the percolate of the garbage transfer station is urgent along with the improvement of the environmental protection requirement.
Patent application CN111762970A discloses a rubbish transfer station filtration liquid processing method, filtration liquid carries out the preliminary treatment through deoiling and coagulating sedimentation, then gets into anaerobic reactor, denitrification pond, nitrification tank and MBR pond in proper order and removes COD and total nitrogen, gets into the advanced treatment system who comprises nanofiltration membrane and reverse osmosis membrane at last. The garbage transfer station is generally located in a city area, biogas generated by anaerobic treatment belongs to flammable and explosive gas, and certain potential safety hazards and secondary pollution exist no matter the biogas is directly combusted or is recycled after being collected. The advanced treatment system adopts a double-membrane method, the investment and replacement cost of the membrane is high, the operation management is complex, a certain amount of difficultly-treated concentrated solution is generated by nanofiltration and reverse osmosis, and additional equipment and cost are required. The treatment method can meet the requirement of standard discharge of wastewater, but has potential safety hazard, large operation and maintenance workload and difficult treatment of concentrated solution.
Patent application CN111646599A discloses a system and a method for integrated treatment of leachate in a refuse transfer station, wherein different levels of produced water are obtained through a first coagulating sedimentation device, a second coagulating sedimentation device and a multi-level membrane treatment device so as to meet the discharge requirement. This system does not set up biochemical treatment, and area is less, but the preliminary treatment only sets up two-stage coagulating sedimentation, and pollutant concentrations such as organic matter, SS are still higher before getting into membrane device, and membrane pollution can be more serious during the operation, needs frequent washing, and work load is great, and membrane life can shorten, and the change cycle is shorter, and the working costs is high, produces the concentrate.
Patent CN212222739U discloses a rubbish transfer station filtration liquid handles integration equipment, including filter, little electrolysis reactor, first reaction precipitation unit, denitrification pond, nitration pond, submergence formula MBR pond, second reaction precipitation unit, fenton's reactor, this integrated device only disposes one-level denitrification/nitration pond, and there is not up to standard risk in total nitrogen of play water and ammonia nitrogen.
In view of the above method and system for treating leachate in a refuse transfer station, the following problems exist in the current treatment of leachate in a refuse transfer station: an anaerobic treatment unit is mostly adopted for higher COD, the generated biogas belongs to flammable and explosive gas, no matter the biogas is directly combusted or is recycled after being collected, certain potential safety hazards and secondary pollution exist, and the anaerobic device is larger in size; the A/O process is adopted for higher total nitrogen and ammonia nitrogen, the retention time of the wastewater is long, the occupied area is large, the nitrogen removal effect is unstable, and the risk that the total nitrogen and the ammonia nitrogen do not reach the standard exists; the existing advanced treatment processes such as nanofiltration, reverse osmosis and the like are adopted, the operation management is complex, the operation cost is high, the water yield is not high, and the produced membrane concentrated solution is difficult to treat and has high cost; the treatment process is complex, the occupied area of the device is large, and the device is not suitable for the built garbage transfer station with short occupied area.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems, the invention aims to provide an integrated device for treating percolate in a garbage transfer station, which is used for removing SS, high COD and high ammonia nitrogen by combining MABR, MBBR and MBR and meeting the requirement of standard discharge after the percolate in the garbage transfer station is treated. The invention also aims to provide a method for treating the percolate of the garbage transfer station.
The technical scheme is as follows: the invention discloses a garbage transfer station leachate treatment integrated device which comprises a pretreatment unit, a biochemical treatment unit and a sludge treatment unit, wherein the pretreatment unit comprises an adjusting tank, a reaction tank and an air floatation tank, an outlet of the adjusting tank is connected with an inlet of the reaction tank, and an outlet of the reaction tank is connected with an inlet of the air floatation tank; the biochemical treatment unit comprises an MABR tank, an MBBR tank and an MBR tank, wherein the outlet of the air floatation tank is connected with the inlet of the MABR tank, the outlet of the MABR tank is connected with the inlet of the MBBR tank, the outlet of the MBBR tank is connected with the MBR tank, and the first outlet of the MBR tank is connected with the inlet of the MABR tank; the sludge treatment unit comprises a sludge concentration tank and a sludge dewatering machine, a first outlet of the MBR tank is connected with an inlet of the sludge concentration tank, and a second outlet of the MBR tank is connected with an inlet of a discharge water tank.
Further, a membrane assembly is arranged in the MABR tank and comprises an air inlet pipeline, a membrane frame, a non-porous hollow fiber membrane and an exhaust pipeline which are sequentially arranged.
Furthermore, a suspension carrier is added into the MBBR tank, the suspension carrier is multi-surface hollow ball seasoning or combined porous ring packing, an aeration system is arranged at the bottom of the MBBR tank body, a mud film composite system is arranged in the tank, and a biological film is attached to the packing.
Further, the MBR tank adopts an embedded immersed membrane or an external membrane, and the reflux ratio of the sludge to the MABR tank is set to be 0.5-2.
Furthermore, a grid is arranged at the inlet of the regulating tank, and the percolate passes through the grid and then enters the regulating tank.
Further, a water pump is arranged between the regulating tank and the reaction tank, and the percolate in the regulating tank is lifted to the reaction tank through the water pump.
Further, the reaction tank comprises a first reaction tank and a second reaction tank, and the first reaction tank and the second reaction tank are internally provided with a stirrer.
Further, a dissolved air tank and a dissolved air pump are arranged outside the air flotation tank, and the air flotation tank is connected with the dissolved air tank through the dissolved air pump.
Further, the integrated percolate treatment device adopts a skid-mounted structure.
The invention also aims to provide a method for treating the percolate of the garbage transfer station, which utilizes the integrated percolate treatment device to treat the percolate reaching the standard and comprises the following steps:
(1) the leachate is pretreated
The method comprises the following steps of enabling leachate to pass through a grid, enabling the leachate to enter a wastewater adjusting tank after larger solid impurities are filtered and intercepted by the grid, homogenizing and equalizing the leachate, then lifting the leachate in the adjusting tank to a reaction tank, putting alkali liquor NaOH, a coagulant PAC and a flocculant PAM into the reaction tank, enabling small particles to form large floccules by arranging a stirrer, enabling the leachate after flocculation reaction to flow into an air flotation tank through an outlet of the reaction tank, and removing suspended matters in the leachate through air flotation in the air flotation tank;
(2) performing biochemical treatment on the percolate
The percolate after passing through the air floatation tank flows into an MABR tank, and a membrane assembly is arranged in the MABR tank to realize synchronous nitrification and denitrification; effluent of the MABR tank flows into an MBBR tank, a suspended carrier with the specific gravity close to that of water is added into the MBBR tank, a sludge-membrane composite system is arranged in the MBBR tank, organic matters in percolate are treated, and synchronous nitrification and denitrification are realized; the effluent of the MBBR tank enters an MBR tank, SS and COD in the percolate are removed through an internal or external membrane of the MBR tank, and the sludge flows back to the MABR tank;
(3) sludge treatment of leachate
The percolate after passing through the MBR tank flows into a drainage tank and is drained by a drainage pump; and discharging the sludge in the MBR tank to a sludge concentration tank, concentrating the sludge, pumping the concentrated sludge into a sludge dewatering machine through a sludge pump for dewatering, transporting the dewatered sludge outside along with the garbage, and refluxing supernatant and dewatering liquid of the sludge concentration tank to the regulating tank.
Further, a membrane component is arranged in the MABR tank, and the synchronous nitrification and denitrification are realized by the following steps: the aeration molecular oxygen permeates from the inner side to the outer side of the membrane, microorganisms are attached to and grow on the outer side of the membrane, a formed biological layer is sequentially provided with an aerobic zone, an anoxic zone and an anaerobic zone from near to far away from the aeration membrane, nitrifying bacteria enriched in the aerobic zone of the inner layer fully utilize molecular oxygen to realize nitrification, the anoxic zone of the middle layer utilizes nitrate nitrogen and a carbon source generated by the aerobic zone to perform denitrification, and the anaerobic zone of the outer layer performs hydrolytic acidification on organic matters in percolate.
Has the advantages that: compared with the prior art, the invention has the advantages that:
1. the method for treating the percolate of the refuse transfer station adopts the MABR, MBBR and MBR combined process as a method for removing organic matters, ammonia nitrogen and total nitrogen in the percolate of the refuse transfer station, is safe and efficient, realizes synchronous nitrification and denitrification through the MABR tank, and has high nitrogen removal efficiency; one MABR tank can replace two tank bodies of A/O in the conventional process, so that the floor area is greatly saved, and the oxygen utilization rate is as high as 14kgO2The/kwh can save more than 50% of aeration, save 50-60% of aeration energy consumption, do not need to supplement carbon source in the nitrogen removal process, and have extremely low sludge yield which is about 50% of the traditional A/O; the MBBR tank has high organic load and strong impact resistance, can treat high-concentration wastewater, has high organic matter removal efficiency, and can further remove ammonia nitrogen and total nitrogen;
2. the integrated device of the invention has simple process for treating the percolate of the garbage transfer station, can meet the requirement of discharging into an urban sewage pipe network, does not adopt anaerobic treatment and concentration membrane treatment procedures, does not generate combustible gas, avoids the risk of methane leakage and explosion, and does not generate concentrated solution;
3. the integrated treatment device provided by the invention has the advantages of high integration degree, small occupied area, convenience in installation, low operation cost and simplicity in operation management, and is not only suitable for newly-built garbage transfer stations, but also suitable for built garbage transfer stations with short occupied areas.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a plan view of the structure of the present invention;
fig. 3 is a flow chart of a leachate treatment method in a refuse transfer station.
Detailed Description
As shown in fig. 1-2, the integrated device for treating leachate in a garbage transfer station in this embodiment includes a pretreatment unit, a biochemical treatment unit, and a sludge treatment unit, where the pretreatment unit includes an adjusting tank 2, a reaction tank, and an air flotation tank 6, an outlet of the adjusting tank 2 is connected to an inlet of the reaction tank, and an outlet of the reaction tank is connected to an inlet of the air flotation tank 6; the biochemical treatment unit comprises an MABR tank 8, an MBBR tank 9 and an MBR tank 10, wherein the outlet of the air floatation tank 6 is connected with the inlet of the MABR tank 8, the outlet of the MABR tank 8 is connected with the inlet of the MBBR tank 9, the outlet of the MBBR tank 9 is connected with the MBR tank 10, and the first outlet of the MBR tank 10 is connected with the inlet of the MABR tank 8; the sludge treatment unit comprises a sludge concentration tank 11 and a sludge dewatering machine 12, wherein a first outlet of the MBR tank 10 is connected with an inlet of the sludge concentration tank 11, and a second outlet of the MBR tank 10 is connected with an inlet of a discharge water tank 13. This leachate treatment integrated device adopts sled dress structure.
2 entrances of equalizing basin set up grid 1, and the filtration liquid waste water that the rubbish transfer produced passes through grid 1 through collecting, filters and intercepts behind the great solid impurity, gets into waste water equalizing basin 2, to the waste water homogeneity volume of equalling, and grid 1 and equalizing basin 2 set up in the rubbish transfer station.
A water pump is arranged between the adjusting tank 2 and the reaction tank, and the percolate in the adjusting tank 2 is lifted to the first reaction tank 3 through the water pump. The reaction tank comprises a first reaction tank 3 and a second reaction tank 5, wherein an alkali liquor NaOH and a coagulant PAC are added into the first reaction tank 3, a flocculant PAM is added into the second reaction tank 5, and stirring machines 4 are arranged in the first reaction tank 3 and the second reaction tank 5 to enable small particles to form large floccules so as to facilitate subsequent air floatation.
The filtration liquid after flocculation flows into air supporting pond 6 through 5 exports of second reaction tank, and the air supporting effect through the microbubble makes suspension and colloidal particles come-up in the filtration liquid in air supporting pond 6, and the dross is scraped the sediment through scraping the sediment machine and is got into the dross groove, utilizes buoyancy to get rid of most solid matter of filtration liquid. The external gas pitcher 7 and the dissolved air pump of dissolving of air supporting pond 6, air supporting pond 6 is connected through the dissolved air pump and is dissolved gas pitcher 7, and the dross is outward transported and is dealt with.
The percolate from which suspended matters are removed flows into an MABR tank 8, a plurality of membrane component assemblies are arranged in the MABR tank 8, and each membrane component assembly comprises an air inlet pipeline, a membrane frame, a non-porous hollow fiber membrane and an exhaust pipeline which are sequentially arranged. The aeration molecular oxygen permeates from the inner side to the outer side of the membrane, microorganisms are attached to and grow on the outer side of the membrane, the concentration of dissolved oxygen is gradually reduced outwards, a formed biological layer is sequentially provided with an aerobic zone, an anoxic zone and an anaerobic zone from near to far away from the aeration membrane, nitrifying bacteria enriched in the inner aerobic zone fully utilize molecular oxygen to realize nitrification, the middle anoxic zone utilizes nitrate nitrogen and a carbon source generated by the aerobic zone to perform denitrification, and the outer anaerobic zone performs hydrolysis acidification to organic matters in sewage to a certain degree, so that the removal efficiency of the organic matters in subsequent units is improved. In the embodiment, the system is started for 2 weeks, the concentration of dissolved oxygen in the tank is maintained to be less than 0.5mg/L, the denitrification load of each group of membrane piles can reach 8-10 kgN/d, and the quantity and the parameter design of the membrane piles are carried out according to the water quantity and the water quality of the transfer station. The whole system can realize synchronous nitrification and denitrification, and because oxygen can not directly oxidize the carbon source in the percolate, a large amount of carbon source is saved in the denitrification process, the carbon source does not need to be supplemented, and the nitrogen removal efficiency is high.
MABR pond 8 goes out the water flow and flows into MBBR pond 9, throw the suspension carrier that a certain amount of proportion is close to water in the MBBR pond 9, the filling volume generally selects 50% ~ 60%, visual quality of water condition adjusts, the suspension carrier chooses multiaspect clean shot condiment or combination formula porous ring to pack for use, start the biofilm formation time and be about 1 ~ 2 weeks, 9 cell body bottoms in MBBR pond set up aeration systems, pack collision and the shearing action in aqueous, make the air bubble more tiny, the utilization ratio of oxygen has been increased, and oxygen utilization efficiency receives the pond volume degree of depth to influence lessly. The system maintains the concentration of dissolved oxygen at 1.5-2.5 mg/L, and the organic load can reach 5-8 kgCOD/m3d. The sludge-film composite system is arranged in the tank, and can treat wastewater with high organic matter concentration due to higher sludge concentration, the organic matter removal efficiency is higher, the impact load resistance is high, aerobic, anoxic and anaerobic environments are respectively formed by the attached biological film on the filler from far to near according to the distance from the filler, the nitrification reaction and the denitrification reaction coexist, and the total nitrogen and ammonia nitrogen in the leachate are removed.
The effluent of the MBBR tank 9 enters an MBR tank 10, SS and COD in the percolate are removed, the effluent is ensured to meet the requirement of nano-tube discharge standard, and the MBR tank 10 adopts a built-in immersed membrane or an external membrane. In this embodiment, taking an example of a built-in MBR membrane, sludge is returned to the MABR tank 8, and the return ratio is set to 0.5-2. Sludge in the MBR tank 10 is periodically discharged to a sludge concentration tank 11. The effluent from the MBR tank 10 flows into a drain tank 13 and is drained by a drain pump. Sludge in the sludge concentration tank 11 is concentrated and then pumped into the sludge dewatering machine 12 through a sludge pump for dewatering, the dewatered sludge is transported and disposed along with garbage, and supernatant and dewatering liquid in the sludge concentration tank 11 flow back to the regulating tank 2.
To further verify the treatment effect of the integrated leachate treatment device in the embodiment, the following example is used for analysis. The COD of the percolate inlet water of a certain refuse transfer station is 40000mg/L, the BOD5 is 22000mg/L, the total nitrogen is 1600mg/L, the ammonia nitrogen is 1500mg/L, and the SS is 5000mg/L, and after passing through the integrated device, the COD and the BOD5The total removal rate can reach more than 99 percent, the total removal rates of ammonia nitrogen and total nitrogen are respectively 98.8 percent and 97.2 percent, the removal efficiency of each pollutant is high, the effluent index meets the requirement of the nano-tube discharge standard, and the prediction of the effect of each treatment unit in the device for removing the main pollutants in the landfill leachate is shown in the following table 1.
TABLE 1 prediction table (unit: mg/L) of the effect of each treatment unit on the removal of main pollutants
The embodiment also provides a method for treating leachate in a refuse transfer station, the flow is shown in fig. 3, and the leachate treatment integrated device is used for performing standard treatment on the leachate, and the method comprises the following steps:
(1) the leachate is pretreated
The method comprises the following steps of enabling percolate to pass through a grid 1, enabling the percolate to enter a wastewater adjusting tank 2 after large solid impurities are filtered and intercepted by the grid 1, homogenizing and equalizing the percolate, lifting the percolate of the adjusting tank 2 to a reaction tank, adding alkali liquor NaOH, a coagulant PAC and a flocculant PAM into the reaction tank, enabling small particles to form large floccules by arranging a stirrer 4, enabling the percolate after flocculation reaction to flow into an air floatation tank 6 through an outlet of the reaction tank, and removing suspended matters in the percolate through air floatation in the air floatation tank 6;
(2) performing biochemical treatment on the percolate
The percolate passing through the air floatation tank 6 flows into an MABR tank 8, and a membrane assembly is arranged in the MABR tank 8 to realize synchronous nitrification and denitrification; the effluent of the MABR tank 8 flows into an MBBR tank 9, a suspended carrier with the specific gravity close to that of water is added into the MBBR tank 9, a sludge-membrane composite system is arranged in the MBBR tank 9, and organic matters in the percolate are treated to realize synchronous nitrification and denitrification; the effluent of the MBBR tank 9 enters an MBR tank 10, SS and COD in the percolate are removed through an internal or external membrane of the MBR tank 10, and the sludge flows back to the MABR tank 8;
(3) sludge treatment of leachate
The percolate after passing through the MBR tank 10 flows into a drainage tank 13 and is drained by a drainage pump; sludge in the MBR tank 10 is discharged to a sludge concentration tank 11, the sludge is concentrated and then pumped into a sludge dewatering machine 12 through a sludge pump for dewatering, the dewatered sludge is transported and disposed along with garbage, and supernatant and dewatering liquid of the sludge concentration tank 11 flow back to the regulating tank 2.
Claims (10)
1. The integrated device for treating the percolate in the garbage transfer station is characterized by comprising a pretreatment unit, a biochemical treatment unit and a sludge treatment unit, wherein the pretreatment unit comprises an adjusting tank (2), a reaction tank and an air floatation tank (6), the outlet of the adjusting tank (2) is connected with the inlet of the reaction tank, and the outlet of the reaction tank is connected with the inlet of the air floatation tank (6); the biochemical treatment unit comprises an MABR tank (8), an MBBR tank (9) and an MBR tank (10), wherein the outlet of the air floatation tank (6) is connected with the inlet of the MABR tank (8), the outlet of the MABR tank (8) is connected with the inlet of the MBBR tank (9), the outlet of the MBBR tank (9) is connected with the MBR tank (10), and the first outlet of the MBR tank (10) is connected with the inlet of the MABR tank (8); the sludge treatment unit comprises a sludge concentration tank (11) and a sludge dewatering machine (12), wherein a first outlet of the MBR tank (10) is connected with an inlet of the sludge concentration tank (11), and a second outlet of the MBR tank is connected with an inlet of a discharge water tank (13).
2. The integrated leachate treatment device according to claim 1, wherein a membrane set module is arranged in the MABR tank (8), and the membrane set module comprises an air inlet pipeline, a membrane frame, a non-porous hollow fiber membrane and an exhaust pipeline which are arranged in sequence.
3. The integrated device for treating percolate according to claim 1, wherein a suspension carrier is added into the MBBR tank (9), the suspension carrier is selected from multi-surface hollow sphere seasonings or combined porous ring packing, an aeration system is arranged at the bottom of the MBBR tank (9), a mud-film composite system is arranged in the tank, and a biological film is attached to the packing.
4. The integrated percolate treatment device according to claim 1, wherein the MBR tank (10) is provided with an internal submerged membrane or an external membrane.
5. The integrated percolate treatment device according to claim 1, wherein a grating (1) is arranged at the inlet of the regulating reservoir (2), and the percolate passes through the grating (1) and then enters the regulating reservoir (2).
6. The integrated percolate treatment device according to claim 1, wherein a water pump is arranged between the regulating reservoir (2) and the reaction reservoir, and the percolate of the regulating reservoir (2) is lifted to the reaction reservoir by the water pump.
7. The integrated percolate treatment device according to claim 1, wherein the reaction tank comprises a first reaction tank (3) and a second reaction tank (5), and a stirrer (4) is arranged in each of the first reaction tank (3) and the second reaction tank (5).
8. The integrated percolate treatment device according to claim 1, wherein a dissolved air tank (7) and a dissolved air pump are arranged outside the floatation tank (6), and the floatation tank (6) is connected with the dissolved air tank (7) through the dissolved air pump.
9. The method for treating the percolate in the garbage transfer station is characterized in that the percolate treatment integrated device of any one of claims 1 to 8 is used for carrying out standard treatment on the percolate, and comprises the following steps:
(1) the leachate is pretreated
The method comprises the following steps of enabling leachate to pass through a grid (1), enabling the leachate to enter a wastewater adjusting tank (2) after being filtered and intercepted by the grid (1), homogenizing and equalizing the leachate, lifting the leachate in the adjusting tank (2) to a reaction tank, adding an alkali liquor NaOH, a coagulant PAC and a flocculant PAM into the reaction tank, enabling small particles to form large floccules by arranging a stirrer (4), enabling the leachate after flocculation reaction to flow into an air flotation tank (6) through an outlet of the reaction tank, and removing suspended matters in the leachate through an air flotation effect in the air flotation tank (6);
(2) performing biochemical treatment on the percolate
The percolate passing through the air floatation tank (6) flows into an MABR tank (8), and a membrane assembly is arranged in the MABR tank (8) to realize synchronous nitrification and denitrification; effluent of the MABR tank (8) flows into an MBBR tank (9), a suspended carrier with the specific gravity close to that of water is added into the MBBR tank (9), a sludge-membrane composite system is arranged in the MBBR tank (9), and organic matters in percolate are treated to realize synchronous nitrification and denitrification; the effluent of the MBBR tank (9) enters an MBR tank (10), SS and COD in the percolate are removed through a built-in or external membrane of the MBR tank (10), and the sludge flows back to the MABR tank (8);
(3) sludge treatment of leachate
The percolate after passing through the MBR tank (10) flows into a drainage tank (13) and is drained by a drainage pump; and sludge in the MBR tank (10) is discharged to a sludge concentration tank (11), the sludge is concentrated and then pumped into a sludge dewatering machine (12) through a sludge pump for dewatering, the dewatered sludge is transported and disposed along with garbage, and supernatant and dewatering liquid of the sludge concentration tank (11) flow back to the regulating tank (2).
10. The method for treating percolate from a refuse transfer station according to claim 9, wherein a membrane assembly is arranged in the MABR tank (8) to realize the synchronous nitrification and denitrification, comprising: the aeration molecular oxygen permeates from the inner side to the outer side of the membrane, microorganisms are attached to and grow on the outer side of the membrane, a formed biological layer is sequentially provided with an aerobic zone, an anoxic zone and an anaerobic zone from near to far away from the aeration membrane, nitrifying bacteria enriched in the aerobic zone of the inner layer fully utilize molecular oxygen to realize nitrification, the anoxic zone of the middle layer utilizes nitrate nitrogen and a carbon source generated by the aerobic zone to perform denitrification, and the anaerobic zone of the outer layer performs hydrolytic acidification on organic matters in percolate.
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| CN115140900A (en) * | 2022-07-20 | 2022-10-04 | 青岛尚禹环保设备科技有限公司 | MABR (moving anaerobic biofilm reactor) process rural sewage treatment equipment |
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| CN209872690U (en) * | 2019-04-12 | 2019-12-31 | 浙江慧丰环保科技有限公司 | Leachate treatment process device for garbage transfer station |
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