Treatment device for leachate of garbage transfer station

Abstract

The utility model discloses a treatment device for leachate of a waste transfer station, which comprises a pretreatment system, an ABR (anaerobic baffled reactor) anaerobic reaction tank, an A / O (anaerobic / oxic) reaction system, a membrane reaction system, a sulfur autotrophic nitrogen removal filter tank, an ultraviolet catalytic oxidation tank and a tail end sedimentation tank which are sequentially connected along the flowing direction of the leachate, the pretreatment system comprises an oil separation adjusting tank, a coagulation air floatation tank and an air floatation tank water producing tank which are sequentially connected, the water outlet end of the air floatation tank water producing tank is communicated with the water inlet end of the ABR anaerobic reaction tank, the A / O reaction system comprises a first-stage A / O reaction tank and a second-stage A / O reaction tank, and the first-stage A / O reaction tank and the second-stage A / O reaction tank are sequentially connected in the percolate flowing direction. The water quality of the treated effluent meets the direct discharge standard and is far higher than the effluent standard in the prior art, the treatment effect is stable, the process is simple and reliable, operation and management are convenient, the advanced energy-saving effect is achieved, and the energy consumption and the operation cost of a sewage treatment system can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage leachate treatment, in particular to a treatment device for leachate of a garbage transfer station. Background Art

[0002] Concentrated landfill leachate is characterized by high concentration, wide fluctuations in water quality, the presence of recalcitrant substances, and large volumes of water. Patent application number 200810183668.9, entitled "Leachate Treatment Method," discloses a leachate treatment method comprising flocculation and sedimentation pretreatment, hydrolysis and pre-acidification, anaerobic treatment, aerobic treatment including short-range nitrification and denitrification and secondary denitrification and nitrification, membrane separation, and oxidative flocculation. However, this technical solution suffers from high loads and blockages during the treatment process, which in turn affect the oxygenation efficiency of the aerobic biological treatment, leading to reduced biological activity, poor effluent quality, and membrane fouling. The treated effluent can only meet the sewage pipe network standards set forth in the "GB / T31962-2015 Water Quality Standard for Wastewater Discharge into Urban Sewers." However, in some remote or rural areas, where municipal pipe networks are not available near waste transfer stations, the discharge standards set forth in the "GB / T31962-2015 Water Quality Standard for Wastewater Discharge into Urban Sewers" cannot meet direct discharge requirements. Therefore, it is necessary to develop new treatment equipment to fully treat the leachate from the garbage transfer station so that the effluent meets the direct discharge standard of Level A in the "GB18918-2002 Pollutant Discharge Standard for Urban Wastewater Treatment Plants". Utility Model Content

[0003] The purpose of the utility model is to provide a device for treating leachate from a garbage transfer station.

[0004] According to one aspect of the utility model, a device for treating leachate from a garbage transfer station is provided, comprising a pretreatment system, an ABR anaerobic reactor, an A / O reaction system, a membrane reaction system, a sulfur autotrophic denitrification filter, an ultraviolet catalytic oxidation tank, and a terminal sedimentation tank, which are sequentially connected in the direction of leachate flow. The pretreatment system comprises an oil separation regulating tank, a coagulation flotation tank, and an air flotation tank water production tank, which are sequentially connected. The water outlet of the air flotation tank water production tank is connected to the water inlet of the ABR anaerobic reactor. The A / O reaction system comprises a first-stage A / O reaction tank and a second-stage A / O reaction tank, which are sequentially connected in the direction of leachate flow.

[0005] In some embodiments, a filter grid is provided at the water inlet end of the oil separation regulating tank, and a first reaction zone and a second reaction zone connected to each other are provided in sequence in the coagulation flotation tank. Alkaline substances and polyaluminum chloride are added to the first reaction zone, and polyacrylamide is added to the second reaction zone.

[0006] In some embodiments, a plurality of baffles are provided in the ABR anaerobic reactor, and the plurality of baffles are sequentially arranged in parallel along the flow direction of the leachate.

[0007] In some embodiments, the first-stage A / O reaction tank is provided with a first anoxic section and a first aerobic section connected in sequence, and the second-stage A / O reaction tank is provided with a second anoxic section and a second aerobic section connected in sequence, and the first aerobic section is connected to the second anoxic section.

[0008] In some embodiments, the membrane reaction system includes an MBR membrane reaction tank and a first reflux pipe, the MBR membrane reaction tank is connected to the second aerobic section, one end of the first reflux pipe extends into the MBR membrane reaction tank, and the other end is connected to the first anoxic section, and the nitrified liquid in the MBR membrane reaction tank is refluxed to the first anoxic section through the first reflux pipe.

[0009] In some embodiments, the present invention further comprises a blower, which is connected to the first aerobic section, the second aerobic section, the MBR membrane reaction tank and the sulfur autotrophic denitrification filter tank through pipelines.

[0010] In some embodiments, the present invention further comprises a spray tower, and an air inlet of the spray tower is connected to the top of the ABR anaerobic reaction tank through a pipeline.

[0011] In some embodiments, the present invention further includes a sludge thickening tank and a sludge dewatering machine. The inlet of the sludge thickening tank is connected to the coagulation flotation tank, the MBR membrane reaction tank, and the terminal sedimentation tank. The outlet of the sludge thickening tank is connected to the sludge dewatering machine. The sludge precipitate generated by the coagulation flotation tank, the sludge precipitate generated by the terminal sedimentation tank, and the sludge precipitate generated by the MBR membrane reaction tank are all transported to the sludge thickening tank for concentration treatment.

[0012] In some embodiments, the present invention further comprises an RO membrane system, wherein the water inlet of the RO membrane system is connected to the water outlet of the terminal sedimentation tank.

[0013] In some embodiments, a sulfur autotrophic denitrification filler is provided in the sulfur autotrophic denitrification filter.

[0014] The beneficial effects of the utility model are as follows: the utility model adopts coagulation flotation pretreatment + ABR baffled anaerobic + two-stage A / O + MBR (built-in ultrafiltration) + deep denitrification filter + ultraviolet catalytic oxidation + RO reverse osmosis treatment technology to degrade the leachate generated by the garbage transfer station. The effluent water quality meets the Class A standard in the "GB18918-2002 Urban Wastewater Treatment Plant Pollutant Discharge Standard" and meets the direct discharge standard, which is much higher than the effluent standard of the existing technology. The treatment effect is stable, the process is simple and reliable, the operation and management are convenient, it has advanced energy-saving effects, can reduce the energy consumption and operating costs of the sewage treatment system, has a low failure rate, and has moderate equipment investment and operating costs, and has market promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a structural schematic diagram of a device for treating leachate from a garbage transfer station. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the embodiments.

[0017] refer to Figure 1 The utility model provides a treatment device for leachate from a garbage transfer station, comprising a pretreatment system 1, an ABR anaerobic reaction tank 2, an A / O reaction system 3, a membrane reaction system 4, a sulfur autotrophic denitrification filter 5, an ultraviolet catalytic oxidation tank 6, a terminal sedimentation tank 7, an RO membrane filtration system 8, a fan 9, a spray tower 10, a sludge thickening tank 101 and a sludge dewatering machine 102.

[0018] The pretreatment system 1 includes an oil separation and regulating tank 11, a coagulation and flotation tank 12, and a flotation tank water production tank 13, which are connected in sequence. The oil separation and regulating tank 11, the coagulation and flotation tank 12, the flotation tank water production tank 13, the ABR anaerobic reactor 2, the A / O reaction system 3, the membrane reactor system 4, the sulfur autotrophic denitrification filter 5, the ultraviolet catalytic oxidation tank 6, the terminal sedimentation tank 7, and the RO membrane filtration system 8 are connected in sequence along the leachate flow direction.

[0019] The oil separator tank 11 is equipped with a filter screen at its water inlet. The coagulation and flotation tank 12 is sequentially connected to a first reaction zone 121 and a second reaction zone 122. Alkaline substances and polyaluminum chloride are added to the first reaction zone 121, while polyacrylamide is added to the second reaction zone 122. The ABR anaerobic reactor 2 is equipped with multiple baffles 21, which are arranged in parallel along the flow direction of the leachate.

[0020] The A / O reaction system 3 includes a first-stage A / O reaction tank and a second-stage A / O reaction tank. The first-stage A / O reaction tank is provided with a first anoxic section 311 and a first aerobic section 312, which are sequentially connected along the leachate flow direction. The second-stage A / O reaction tank is provided with a second anoxic section 321 and a second aerobic section 322, which are sequentially connected along the leachate flow direction. The first aerobic section 312 is connected to the second anoxic section 321. No internal reflux pipe is provided between the first anoxic section 311, the first aerobic section 312, the second anoxic section 321, and the second aerobic section 322.

[0021] The membrane reactor system 4 includes an MBR membrane reactor tank 41 and a first reflux pipe 42. The MBR membrane reactor tank 41 is connected to the second aerobic section 322. One end of the first reflux pipe 42 extends into the MBR membrane reactor tank 41, and the other end is connected to the first anoxic section 311. The nitrified liquid in the MBR membrane reactor tank 41 is returned to the first anoxic section 311 through the first reflux pipe 42.

[0022] Sulfur autotrophic denitrification filter 5 is equipped with sulfur autotrophic denitrification fillers to deeply denitrify the landfill leachate. Ultraviolet catalytic oxidation tank 6 uses a UV-catalyzed wet oxidation process, introducing high-energy ultraviolet light, hydrogen peroxide (oxidant), and ferrous ions (catalyst). At a temperature of 25-80°C and normal pressure, it thoroughly decomposes high-concentration, toxic, and difficult-to-degrade organic pollutants into harmless components such as CO2 and water. It also deodorizes, decolorizes, and sterilizes the wastewater, thereby purifying the wastewater.

[0023] The fan 9 is connected to the first aerobic section 312 , the second aerobic section 322 , the MBR membrane reaction tank 41 and the sulfur autotrophic denitrification filter 5 through pipelines, and aerates the first aerobic section 312 , the second aerobic section 322 , the MBR membrane reaction tank 41 and the sulfur autotrophic denitrification filter 5 .

[0024] The air inlet of the spray tower 10 is connected to the top of the ABR anaerobic reaction tank 2 through a pipeline, and the waste gas generated by the ABR anaerobic reaction tank 2 is sprayed and discharged after meeting the standards.

[0025] The inlet of the sludge thickening tank 101 is connected to the coagulation and flotation tank 12, the MBR membrane reactor 41, and the terminal sedimentation tank 7. The sludge sediment produced by the coagulation and flotation tank 12, the terminal sedimentation tank 7, and the MBR membrane reactor 41 is transported to the sludge thickening tank 101 for concentration. The outlet of the sludge thickening tank 101 is connected to the sludge dewatering machine 102, which dehydrates the concentrated sludge and returns the dehydrated water to the oil separator 11. The water inlet of the RO membrane filtration system 8 is connected to the water outlet of the terminal sedimentation tank 7, and reverse osmosis treatment is performed on wastewater that does not meet the standards after treatment in the terminal sedimentation tank 7.

[0026] Example 2

[0027] For example, a garbage transfer station in Hefei, Anhui Province, located in a county-level city's centralized garbage transfer center, compresses approximately 300 tons of garbage daily and produces approximately 45 tons of filtrate. Using the treatment device described in Example 1, the leachate enters the oil separator tank 11, where it undergoes degradation treatment using a combined process of "coagulation and flotation pretreatment + ABR baffled anaerobic treatment + two-stage A / O treatment + MBR (with built-in ultrafiltration) + deep denitrification filter + UV catalytic oxidation + RO reverse osmosis." See Table 1 for influent water quality indicators.

[0028] Table 1 Influent water quality index

[0029] project CODcr(mg / L) BOD5(mg / L) SS (mg / L) <![CDATA[NH3-N(mg / L)]]> Numerical 15000 8000 2300 500 project TN (mg / L) TP (mg / L) pH Animal and vegetable oils (mg / L) Numerical 1000 50 4-8 550

[0030] After treatment with the device of Example 1, the main indicators of the effluent can meet the Class A emission standards of GB18918-2002 "Pollutant Discharge Standards for Urban Wastewater Treatment Plants" and can be directly discharged. The effluent water quality discharge standards are shown in Table 2 below.

[0031] Table 2 Effluent water quality discharge standards

[0032] project CODcr(mg / L) BOD5(mg / L) SS (mg / L) <![CDATA[NH3-N(mg / L)]]> Numerical ≤50 ≤10 ≤10 ≤5 project TN (mg / L) TP (mg / L) pH (mg / L) Animal and vegetable oils (mg / L) Numerical ≤15 ≤0.5 6-9 ≤1

[0033] During the degradation treatment of landfill leachate, the actual removal rates of each process section are shown in Table 3 below. The brackets in Table 3 indicate the removal rates of the target pollutants in that process section.

[0034]

[0035]

[0036] As can be seen from Table 3, the pretreatment system 1 of the present invention has a SS removal rate of 90% for the leachate in the process section, the ABR anaerobic reaction tank 2 has a CODCr and BOD5 removal rate of 80% for the leachate in the process section, the MBR membrane reaction tank 41 has a CODCr, BOD5, ammonia nitrogen, TN, and YP removal rate of 80% to 99% for the leachate in the process section, the sulfur autotrophic denitrification filter 5 has a TN removal rate of 82% for the leachate in the process section, and the ultraviolet catalytic oxidation tank 6 has a CODCr, BOD5, TP, and SS removal rate of 70% to 92% for the leachate in the process section, which solves the problems of easy clogging, high load, and membrane pollution in the degradation treatment, and ensures that the effluent meets the direct discharge standard.

[0037] The above are only some embodiments of the present invention. For ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A device for treating leachate from a garbage transfer station, characterized in that: The invention comprises a pretreatment system, an ABR anaerobic reaction tank, an A / O reaction system, a membrane reaction system, a sulfur autotrophic denitrification filter, an ultraviolet catalytic oxidation tank and a terminal sedimentation tank which are sequentially connected along the flow direction of the leachate. The pretreatment system comprises an oil separation regulating tank, a coagulation flotation tank and an air flotation tank water production tank which are sequentially connected. The water outlet of the air flotation tank water production tank is connected to the water inlet of the ABR anaerobic reaction tank. The A / O reaction system comprises a first-stage A / O reaction tank and a second-stage A / O reaction tank which are sequentially connected along the flow direction of the leachate.

2. The device for treating leachate from a garbage transfer station according to claim 1, characterized in that: The water inlet end of the oil separation regulating tank is provided with a filter grid, and the coagulation flotation tank is provided with a first reaction zone and a second reaction zone connected in sequence. Alkaline substances and polyaluminum chloride are added to the first reaction zone, and polyacrylamide is added to the second reaction zone.

3. The device for treating leachate from a garbage transfer station according to claim 1, characterized in that: A plurality of baffles are arranged in the ABR anaerobic reaction tank, and the baffles are arranged in parallel in sequence along the flow direction of the leachate.

4. The device for treating leachate from a garbage transfer station according to claim 1, characterized in that: The first-stage A / O reaction tank is provided with a first anoxic section and a first aerobic section which are connected in sequence, and the second-stage A / O reaction tank is provided with a second anoxic section and a second aerobic section which are connected in sequence, and the first aerobic section is connected to the second anoxic section.

5. The device for treating leachate from a garbage transfer station according to claim 4, characterized in that: The membrane reaction system includes an MBR membrane reaction tank and a first reflux pipe. The MBR membrane reaction tank is connected to the second aerobic section. One end of the first reflux pipe extends into the MBR membrane reaction tank, and the other end is connected to the first anoxic section. The nitrified liquid in the MBR membrane reaction tank is refluxed to the first anoxic section through the first reflux pipe.

6. The device for treating leachate from a garbage transfer station according to claim 5, characterized in that: The system further comprises a blower, which is connected to the first aerobic section, the second aerobic section, the MBR membrane reaction tank and the sulfur autotrophic denitrification filter tank through pipelines.

7. The device for treating leachate from a garbage transfer station according to claim 1, characterized in that: The system also includes a spray tower, wherein the air inlet of the spray tower is connected to the top of the ABR anaerobic reaction tank through a pipeline.

8. The device for treating leachate from a garbage transfer station according to claim 5, characterized in that: It also includes a sludge thickening tank and a sludge dewatering machine. The inlet of the sludge thickening tank is connected to the coagulation flotation tank, the MBR membrane reaction tank, and the terminal sedimentation tank. The outlet of the sludge thickening tank is connected to the sludge dewatering machine. The sludge precipitate generated by the coagulation flotation tank, the sludge precipitate generated by the terminal sedimentation tank, and the sludge precipitate generated by the MBR membrane reaction tank are transported to the sludge thickening tank for concentration treatment.

9. The device for treating leachate from a garbage transfer station according to claim 8, characterized in that: It also includes an RO membrane system, and the water inlet end of the RO membrane system is connected to the water outlet end of the terminal sedimentation tank.

10. The device for treating leachate from a garbage transfer station according to claim 1, characterized in that: Sulfur autotrophic denitrification filler is provided in the sulfur autotrophic denitrification filter tank.

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