CN112979065A - Garbage transfer station leachate full-treatment system - Google Patents

Garbage transfer station leachate full-treatment system Download PDF

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Publication number
CN112979065A
CN112979065A CN202110170442.0A CN202110170442A CN112979065A CN 112979065 A CN112979065 A CN 112979065A CN 202110170442 A CN202110170442 A CN 202110170442A CN 112979065 A CN112979065 A CN 112979065A
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tank
treatment system
sludge
sedimentation tank
nitrification
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周刚
王久龙
林媛媛
朱艳臣
宋婷婷
方沁舲
施佳瑾
高文郑
高桐
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Environmental Engineering Co ltd Zhejiang Province
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Environmental Engineering Co ltd Zhejiang Province
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/125Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/24Treatment of water, waste water, or sewage by flotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56Macromolecular compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06Contaminated groundwater or leachate
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00Use of specific compounds during water treatment
    • C02F2305/02Specific form of oxidant
    • C02F2305/026Fenton's reagent
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes

Abstract

The invention discloses a full-scale treatment system for percolate of a garbage transfer station, which comprises a sludge treatment system, and a pretreatment system, an efficient anaerobic system, an efficient biochemical system and an advanced treatment system which are sequentially connected; the high-efficiency anaerobic system comprises a hydrolysis acidification tank, a high-efficiency anaerobic tank and a biogas treatment system which are connected in sequence; the high-efficiency biochemical system comprises a two-stage denitrification/nitrification treatment system and an MBR separation device which are connected in sequence; the deep treatment system comprises a coagulation sedimentation tank, a multistage Fenton fluidized bed, a Fenton sedimentation tank, a biological fluidized bed and an outward discharge sedimentation tank which are sequentially connected. After the leachate of the garbage transfer station is treated by the system, the total amount of the leachate reaches the standard and is discharged outside, membrane concentrated water is not generated by the system, and the leachate does not need to be refilled to a garbage pile or subjected to other treatments such as evaporation, oxidation reduction and the like, so that the total flow of the leachate reaches the standard and is discharged.

Description

Garbage transfer station leachate full-treatment system
Technical Field
The invention relates to a full-scale treatment system for percolate of a garbage transfer station, in particular to a percolate treatment system of the garbage transfer station, which comprises a pretreatment system, a high-efficiency anaerobic system, a high-efficiency biochemical system and a deep treatment system.
Background
With the increasing production of urban garbage, most domestic towns choose a clean direct transportation-incineration power generation mode to transport and treat domestic garbage. Therefore, the original small garbage transfer/collection station in the town is gradually cancelled, and the original small garbage transfer/collection station is constructed instead of various large and medium garbage transfer stations. Large and medium-sized garbage transfer stations have large leachate production amount due to large garbage transfer amount, and have great influence on the surrounding environment.
The leachate of the garbage transfer station is mainly secondary pollution generated by compressing municipal solid wastes in the transfer station. In the compression process of the municipal solid waste in the transfer station, the water contained in the waste can be pressed out, and pollutants in the waste can be brought out by the water, so that the landfill leachate is gradually formed. The pollutant sources in the landfill leachate are mainly as follows: soluble and insoluble organic and inorganic substances contained in the garbage itself.
The garbage transfer station leachate is high-concentration special organic wastewater and has the characteristics of high pollutant concentrations such as chemical oxygen demand (not less than 30000mg/L), biochemical oxygen demand (not less than 5000mg/L), ammonia nitrogen (not less than 500mg/L), total nitrogen (not less than 1200mg/L), total phosphorus (not less than 70mg/L), large water quality and water volume change, multiple harmful and toxic pollutants and the like. In addition, the garbage transfer station is different from a garbage landfill site, and is generally built in a central area of a town. Therefore, the leachate treatment system is required to have high pollutant treatment efficiency, intensive and small occupied area of treatment facilities, no secondary pollution and the like.
The existing landfill leachate treatment technology is mainly derived from landfill leachate treatment technology, and generally adopts pretreatment, ammonia stripping, biochemical treatment system, MBR/NF/RO/DTRO membrane treatment system. The leachate can be discharged after reaching the standard after being treated by the system, but membrane concentrated water and ammonia stripping waste liquid can be generated, and the leachate is not discharged after reaching the standard in full quantity. The membrane concentrated water is generally treated by recharging to a garbage pile body and advanced oxidation or evaporation, the treatment cost is high, the standard reaching difficulty of the concentrated water is high, and dangerous waste can be generated in the treatment process. Meanwhile, the landfill leachate is treated by adopting the process of 'regulation + pretreatment + denitrification/nitrification + ultrafiltration + iron oxidation + coagulating sedimentation + filtration', although the process can also meet the requirement of full-scale treatment of the leachate, the process is only suitable for treating the landfill leachate with low concentration (CODcr is less than or equal to 10000mg/L, and total nitrogen is less than or equal to 1000mg/L), and is not completely suitable for treating the landfill leachate in a middle station of garbage. Meanwhile, the process has the problems that the nitrification/denitrification tank occupies a large area, and the sludge production amount in the iron oxidation process is large.
The leachate of the refuse transfer station belongs to fresh leachate and is not fermented by a refuse dump, so the concentration of various pollutants (CODcr is more than or equal to 10000mg/L, total nitrogen is more than or equal to 2000mg/L, and TP is more than or equal to 2000mg/L) of the leachate is generally higher than that of the leachate of a refuse landfill. Meanwhile, the garbage in the transfer station contains a certain proportion of kitchen waste, so that the quality of the percolate in the transfer station is more complex, and the treatment difficulty of the percolate is higher than that of the percolate in a refuse landfill. In addition, the garbage transfer station is located in suburbs in cities and towns, if a percolate system generates concentrated water, the concentrated water cannot recharge garbage piles, if advanced oxidation or evaporation mode is adopted for treatment, the reliability of the concentrated water reaching the standard is poor, dangerous waste can be generated in the treatment process, and secondary pollution can be caused to further influence the surrounding environment. The land occupation of a common garbage transfer station is highly intensive, so that leachate treatment facilities are required to be highly intensive and occupy small land. Therefore, the development of a full-scale treatment system suitable for the leachate of the refuse transfer station is urgently needed.
The invention relates to a full-scale treatment system for percolate, which consists of a pretreatment system, a high-efficiency anaerobic system, a high-efficiency biochemical system and a deep treatment system. The efficient anaerobic system has the characteristics of small occupied area, high CODcr degradation efficiency, biodegradability improvement and the like, and can effectively reduce the occupied area of the biochemical system. And in addition, partial leachate exceeds the anaerobic tank to enter a biochemical system after being hydrolyzed and acidified, so that sufficient carbon sources are provided for denitrification of the biochemical system. The main process of the advanced treatment system consists of a Fenton fluidized bed and a biological fluidized bed, and has the characteristics of small occupied area, high CODcr removal rate, low denitrification efficiency and low high-grade sludge production.
Disclosure of Invention
The invention aims to provide a full-scale treatment system for percolate of a garbage transfer station, which consists of a pretreatment system, a high-efficiency anaerobic system, a high-efficiency biochemical system and a deep treatment system, wherein the above unit systems supplement each other and are all indispensable. The system does not produce concentrated water, does not have concentrated water treatment equipment, and has the advantages of simple system equipment, convenient operation, good treatment effect and low operation cost.
The main pollutants in the leachate are suspended matters, oils, chemical oxygen demand, biochemical oxygen demand, ammonia nitrogen, total phosphorus and the like. The pretreatment comprises a grid, a primary sedimentation tank, air floatation equipment and an adjusting tank which are connected in sequence. The pretreatment system mainly treats large impurities, suspended matters and oils of the leachate, preliminarily reduces the suspended matters, oils, chemical oxygen demand, biochemical oxygen demand and total phosphorus in the leachate, and regulates the quality and quantity of the leachate. After the leachate is pretreated, the operation stability and treatment effect of a subsequent high-efficiency anaerobic system and a high-efficiency biochemical system can be ensured.
The high-efficiency anaerobic system comprises a hydrolysis acidification tank, a high-efficiency anaerobic tank and a biogas treatment system which are connected in sequence. The chemical oxygen demand of the landfill leachate of the transfer station is generally more than or equal to 30000mg/L, the biochemical oxygen demand is generally more than or equal to 5000mg/L, but the B/C is generally less than 0.15, and the landfill leachate belongs to high-concentration refractory wastewater, and aims to ensure that the leachate can be treated in full quantity, reduce the energy consumption and load of a subsequent biochemical treatment system and ensure the treatment effect. The leachate is treated by adopting a hydrolysis acidification tank and a high-efficiency anaerobic tank, the hydrolysis acidification tank adopts an up-flow state, water distribution adopts a pulse circulating rotational flow form, an electric plate heat exchanger is adopted to heat the leachate, high-efficiency hydrolytic bacteria are adopted to improve the B/C ratio of the leachate, and organic nitrogen is hydrolyzed into ammonia nitrogen. The high-efficiency anaerobic tank adopts a UASB or EGSB form according to the characteristics of water quality, the water distribution adopts a pulse circulating rotational flow form, the anaerobic circulating stirring adopts double-effect circulation of methane and water power, and the domesticated granular sludge is adopted to ensure that the sludge and the water in the tank are fully mixed, thereby greatly reducing the chemical oxygen demand and the biochemical oxygen demand in the leachate. The operation stability and the treatment effect of a subsequent high-efficiency biochemical system can be ensured.
The high-efficiency biochemical system comprises a two-stage denitrification/nitrification treatment system and an MBR (external) membrane separation device (or secondary sedimentation tank) which are connected in sequence. Wherein a submersible stirrer or a hyperboloid stirrer is arranged in the denitrification tank for stirring, a carbon source adding device is arranged, and the total nitrogen treatment rate of the denitrification tank is more than or equal to 90 percent. And a high-efficiency jet aerator, a jet pump and a cooling device consisting of a plate heat exchanger and a cooling tower are arranged in the nitrification tank. The treatment rate of the chemical oxygen demand and the biochemical oxygen demand of the nitrification tank is more than or equal to 90 percent, and the treatment rate of the ammonia nitrogen is more than or equal to 95 percent. The effluent of the two-stage denitrification/nitrification treatment system is subjected to sludge-water separation by adopting an MBR (external) membrane separation device (or a secondary sedimentation tank), the effluent enters the advanced treatment system, and the intercepted sludge flows back to the two-stage denitrification/nitrification tank.
Generally, two indexes of chemical oxygen demand and total nitrogen in effluent water of an MBR (external) membrane separation device cannot reach the standard. The conventional process is that MBR effluent is treated by adopting a process of NF + RO/DTRO, the chemical oxygen demand and total nitrogen in percolate are intercepted in membrane concentrated water, and membrane clear water reaches the standard and is discharged outside. And the membrane concentrated water is recharged to the garbage pile body or treated by adopting the processes of advanced oxidation and evaporation. The membrane concentrated water has high treatment cost and great treatment difficulty.
Aiming at the percolate of the transfer station, the advanced treatment system adopted by the invention comprises a coagulation sedimentation tank, a multi-stage Fenton fluidized bed, a Fenton sedimentation tank, a multi-stage biological fluidized bed and an outward discharge sedimentation tank which are connected in sequence. After the total effluent of the MBR (external) membrane separation device is treated by the advanced treatment system, the total leachate can completely reach the standard of table 2 in the pollution control Standard of municipal solid waste landfill (GB 16889 + 2008), and secondary pollutants such as concentrated water, other wastewater needing to be treated again, hazardous waste and the like are not generated.
In order to realize the aim, the invention provides a landfill leachate treatment system, a pretreatment system, a high-efficiency anaerobic system, a high-efficiency biochemical system and an advanced treatment system which are connected in sequence;
the pretreatment system comprises a grating, a primary sedimentation tank, an air floatation tank and a regulating tank which are connected in sequence;
the efficient anaerobic system comprises a hydrolysis acidification tank, an efficient anaerobic tank and a biogas treatment system which are connected in sequence;
the high-efficiency biochemical system comprises a two-stage denitrification/nitrification treatment system and a tubular MBR device which are connected in sequence; the effluent of the tubular MBR device enters a coagulation sedimentation tank of the advanced treatment system;
the deep treatment system comprises a coagulation sedimentation tank, a multi-stage Fenton fluidized bed, a Fenton sedimentation tank, a biological fluidized bed and an outward discharge sedimentation tank which are connected in sequence; the sludge outlets at the bottoms of the coagulating sedimentation tank, the Fenton sedimentation tank, the biological fluidized bed and the outward discharge sedimentation tank are respectively connected with a sludge tank of a sludge outward transport system; and the clear liquid in the outward discharge sedimentation tank is discharged after reaching the standard.
Wherein, the hydrolysis acidification tank in the high-efficiency anaerobic system adopts an up-flow type, the water distribution adopts a pulse circulating rotational flow mode, and an electric plate heat exchanger is adopted to heat the percolate. The high-efficiency anaerobic tank adopts a UASB or EGSB form, the water distribution adopts a pulse circulating rotational flow form, and the anaerobic circulating stirring adopts double-effect circulation of methane and hydraulic stirring. The biogas treatment system comprises a biogas purification and combustion torch system.
The high-efficiency biochemical system comprises a two-stage denitrification/nitrification treatment system and an MBR separation device (or a secondary sedimentation tank) which are connected in sequence; the MBR separation device can be arranged internally or externally. The high-efficiency biochemical system comprises cooling equipment such as a heat exchanger, a cooling tower and the like. And the effluent of the MBR device enters an advanced treatment system.
The deep treatment system comprises a coagulation sedimentation tank, a multi-stage Fenton fluidized bed, a Fenton sedimentation tank, a multi-stage biological fluidized bed and an outward discharge sedimentation tank which are connected in sequence. Wherein the coagulating sedimentation tank, the Fenton sedimentation tank and the outward discharge sedimentation tank can adopt a vertical flow type, a horizontal flow type or an outward discharge sedimentation tank. The Fenton fluidized bed is generally in one to two stages, and adopts an upflow and circulating structure, and a catalyst carrier, a hydraulic stirring device, a gas stirring device and a catalyst separation device are contained in the Fenton fluidized bed. The biological fluidized bed generally adopts one to two stages and comprises two working conditions of denitrification and nitrification, and a sponge filler, a filler intercepting device and a filler fluidizing device such as hydraulic stirring, gas stirring and the like are arranged in the tank. The sludge outlets at the bottoms of the coagulating sedimentation tank, the primary sedimentation tank, the denitrification biological fluidized bed, the secondary sedimentation tank, the denitrification/nitrification biological fluidized bed and the outward discharge sedimentation tank are respectively connected with a sludge tank of the sludge outward transport system; and discharging the clear liquid in the discharging sedimentation tank after reaching the standard.
As an embodiment of the invention, a PAC dosing device and a PAM dosing device are respectively arranged on the primary sedimentation tank and the air floatation tank.
As an embodiment of the invention, the primary sedimentation tank and the air floatation tank are respectively provided with a sludge outlet connected with a sludge tank.
As an embodiment of the invention, a mechanical stirrer and a hydraulic stirring pump are arranged in the regulating reservoir.
As an embodiment of the invention, the effluent of the regulating reservoir enters the high-efficiency anaerobic system after being lifted by the water pump.
As an embodiment of the invention, the high-efficiency anaerobic system comprises a hydrolysis acidification tank, a high-efficiency anaerobic tank and a methane treatment system which are connected in sequence.
As one embodiment of the invention, the hydrolysis acidification tank is provided with a pulse circulation rotational flow water distribution device, and the electric plate type heat exchangers are arranged on the backflow pipeline and the water inlet pipeline.
As an embodiment of the invention, the high-efficiency anaerobic tank is provided with a pulse circulating rotational flow water distribution device, a methane stirring device and a methane collecting, purifying and burning torch. The effluent of the high-efficiency anaerobic tank enters a first-stage denitrification tank of a high-efficiency biochemical system.
As an embodiment of the invention, the hydrolysis acidification tank and the high-efficiency anaerobic tank are also provided with a sludge outlet connected with the sludge tank.
As an embodiment of the invention, the two-stage denitrification/nitrification treatment system comprises a first-stage denitrification tank, a first-stage nitrification tank, a second-stage denitrification tank and a second-stage nitrification tank which are connected in sequence.
As an embodiment of the invention, the high-efficiency jet aerator is arranged in the primary nitrification tank, the jet aerator is connected with a plurality of reflux pumps arranged outside the primary nitrification tank through valves, and the reflux pumps are also connected with the primary denitrification tank.
As an embodiment of the invention, a heat exchanger is arranged outside the primary nitrification tank. The heat exchanger is connected with a return pipeline in the primary nitrification tank.
As an embodiment of the invention, a cooling tower is arranged outside the primary nitrification tank. The heat exchanger is connected with the cooling tower through a cold water taking pump.
As an embodiment of the invention, a jet aerator is arranged in the secondary nitrification tank, the jet aerator is connected with a plurality of reflux pumps arranged outside the secondary nitrification tank through valves, and the effluent of the secondary nitrification tank (through the reflux pumps) goes to an MBR (external) membrane separation device (or a secondary sedimentation tank).
As an embodiment of the invention, a carbon source adding device is arranged in the secondary nitrification tank.
As an embodiment of the invention, a mechanical stirrer is respectively arranged in the primary denitrification tank and the secondary denitrification tank.
As an embodiment of the invention, an MBR (external) membrane separation device (or a secondary sedimentation tank) is provided with a sludge outlet connected with a sludge tank, and is also provided with a sludge concentrated solution return outlet connected with the primary denitrification tank and the secondary denitrification tank.
As an embodiment of the invention, the effluent of an MBR (external) membrane separation device (or a secondary sedimentation tank) enters a coagulating sedimentation tank of an advanced treatment system.
As an embodiment of the invention, a flocculating agent dosing device and a PAM dosing device are arranged on the coagulating sedimentation tank.
As an embodiment of the present invention, a multistage Fenton fluidized bed is generally used in one or two stages. And an air-entrapping device, a sulfuric acid dosing device, a hydrogen peroxide dosing device and a ferrous sulfate dosing device are respectively arranged on the Fenton fluidized bed. And a hydraulic stirring pump and a catalyst carrier are respectively arranged on the Fenton fluidized bed.
As an embodiment of the invention, a liquid caustic soda dosing device and a PAM dosing device are respectively arranged on the Fenton sedimentation tank.
As an embodiment of the invention, the multistage biological fluidized bed consists of one-stage or two-stage denitrification biological fluidized bed and nitrification biological fluidized bed. A carbon source feeding device is arranged on the denitrification biological fluidized bed.
As an embodiment of the present invention, the biological fluidized bed is filled with sponge filler. More specifically, the denitrifying biological fluidized bed is filled with sponge filler enriched with denitrifying bacteria. The nitrifying biological fluidized bed is filled with sponge filler enriched with denitrifying bacteria.
As an embodiment of the invention, a PAC dosing device and a PAM dosing device are arranged on the sedimentation tank of the outward discharge sedimentation tank.
As an embodiment of the invention, the sludge treatment system comprises a sludge tank and a dehydrator; the sludge outlets of the pretreatment system, the high-efficiency anaerobic system, the high-efficiency biochemical MBR system and the advanced treatment system are respectively connected with a sludge tank.
As an embodiment of the invention, the dehydrator can be a horizontal screw centrifugal dehydrator, sludge is discharged into a sludge tank and is lifted into the horizontal screw centrifugal dehydrator by a sludge pump.
Compared with the prior art, the invention has the following technical effects:
1. the efficient anaerobic system of the system adopts a hydrolysis acidification tank and an efficient anaerobic tank; the hydrolysis acidification tank adopts an up-flow state, the water distribution adopts a pulse circulation rotational flow form, the electric plate heat exchanger is adopted to heat the percolate, and efficient hydrolytic bacteria are adopted to improve the B/C ratio of the percolate, thereby being beneficial to improving the treatment efficiency of the anaerobic tank, obviously improving the treatment load of the anaerobic tank and reducing the tank capacity of the anaerobic tank. In addition, part of the effluent of the hydrolysis tank enters the anaerobic tank, and part of the effluent exceeds the anaerobic tank and directly enters a subsequent biochemical system to meet the requirement of a carbon source for denitrification and denitrification of the biochemical systemThe demand and the carbon source adding amount are reduced. The anaerobic tank can adopt the forms of UASB or EGSB and the like according to the water inlet concentration and the site size; the high-efficiency anaerobic tank adopts a pulse circulating rotational flow water distribution mode, the circulating stirring adopts methane and waterpower double-effect circulation, the high-efficiency granular sludge is adopted in the tank, the biomass in a sludge bed is large, the volume load rate can reach 20-30 g/L by calculation of the reduced concentration, and the high-efficiency granular sludge can generally reach 10kgCOD/(m m.sup.3D) about, even up to 15-40 kgCOD/(m)3D) the hydraulic retention time of the waste water in the reactor is relatively short, so that the required tank volume is greatly reduced; the device is simple, the operation is convenient, a sedimentation tank and a sludge reflux device do not need to be arranged, the filling is not needed, a mechanical stirring device does not need to be arranged in the reaction area, the manufacturing cost is relatively low, the management is convenient, and the blockage problem does not exist.
2. Because the garbage transfer station adopts the high-efficiency anaerobic system to treat the percolate, the COD concentration of the effluent of the system is greatly degraded, and the COD load of a subsequent treatment unit can be reduced; the method is beneficial to improving the nitrification efficiency of ammonia nitrogen and the denitrification efficiency of total nitrogen in the two-stage denitrification/nitrification treatment system, and lays a foundation for the MBR system to reach lower water quality of effluent pollutant indexes.
3. According to the invention, in the high-efficiency biochemical system, two-stage nitrification/denitrification aims at the water quality characteristics of percolate of the garbage transfer station, aeration equipment and a reflux form are optimized, and a carbon source adding system is arranged to ensure that the system achieves the treatment effect of high-efficiency ammonia nitrogen and total nitrogen;
the MBR system in the high-efficiency biochemical system adopts a tubular MBR device, and the operating flux is large (50-120L/H); the pollution resistance is good; the membrane equipment is arranged externally, and is simple to install, maintain and operate; the structure is compact, and the occupied area is small; long membrane life (4-5 years); the membrane core can be independently disassembled, overhauled and replaced, and the membrane replacement cost is low; the energy consumption is lower than that of similar products; the method is suitable for high-concentration industrial wastewater, landfill leachate and other wastewater which are difficult to treat; the MBR system treats the full amount of percolate and then enters the advanced treatment system, the effluent ammonia nitrogen and the biochemical oxygen demand of the MBR system basically reach the standard, the chemical oxygen demand is less than 800mg/L, the total nitrogen is less than 100mg/L, no concentrated water is generated, no recharge or other treatment is needed, no secondary pollution is caused, and a foundation is laid for the effluent of the advanced treatment system to reach the standard.
4. In the advanced treatment system of the system, the coagulating sedimentation and the multistage Fenton fluidized bed mainly treat the chemical oxygen demand in the percolate through the physical and chemical action. And the multi-stage biological fluidized bed carries out biological treatment on the total nitrogen in the leachate through the heterotrophic bacteria, the denitrifying bacteria and the external carbon source which are loaded on the sponge carrier. The effluent sedimentation tank ensures that the chemical oxygen demand and suspended matters of the effluent reach the standard through the coagulating sedimentation effect of the flocculating agent; the whole advanced treatment system carries out full treatment on the percolate by adopting a physical chemistry and biological action rather than a membrane concentration mode, ensures that the full treatment reaches the standard, and does not generate concentrated water or other secondary pollutants except sludge.
5. The wastewater treated by the system disclosed by the invention does not generate concentrated water, does not need to be recharged or subjected to other treatments, and can be discharged after reaching the standard at full flow.
Drawings
FIG. 1 is a schematic process flow diagram of the system of the present invention;
FIG. 2 is a schematic diagram of the structure of a two-stage denitrification/nitrification treatment system;
FIG. 3 is a schematic diagram of an advanced treatment system;
wherein, the system comprises 1-a first-stage denitrification tank, 2-a first-stage nitrification tank, 3-a second-stage denitrification tank, 4-a second-stage nitrification tank, 5-a submersible mixer, 6-a cooling tower, 7-a plate heat exchanger, 8-a jet aerator, 9-a reflux pump, 10-a coagulating sedimentation tank, 11-a first-stage Fenton fluidized bed, 12-a first-stage Fenton sedimentation tank, 13-a denitrifying biological fluidized bed, 14-a second-stage Fenton fluidized bed, 15-a second-stage Fenton sedimentation tank, 16-a denitrifying/nitrifying biological fluidized bed and 17-an effluent sedimentation tank.
Detailed Description
The present invention will be described in detail with reference to examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be apparent to those skilled in the art that several modifications and improvements can be made without departing from the inventive concept. All falling within the scope of the present invention.
Example 1
The embodiment provides a landfill leachate treatment system as shown in fig. 1, which comprises a pretreatment system, a high-efficiency anaerobic system, a high-efficiency biochemical system, a deep treatment system and a sludge outward transportation system which are connected in sequence.
Pretreatment system
The pretreatment system comprises a grid water collecting tank, a primary sedimentation tank, a coagulation air flotation tank and an adjusting tank which are connected in sequence; the primary sedimentation tank and the coagulation air floatation tank are respectively provided with a sludge outlet connected with the sludge tank. And a PAC dosing device and a PAM dosing device are respectively arranged on the primary sedimentation tank and the coagulation air flotation tank; an underwater stirrer and a hydraulic stirring pump are arranged in the adjusting tank.
High-efficiency anaerobic system
The high-efficiency anaerobic system comprises a hydrolysis acidification tank, a high-efficiency anaerobic tank and a methane treatment system; and the effluent of the regulating tank enters a first-stage denitrification tank of the high-efficiency biochemical system after being subjected to hydrolytic acidification and anaerobic UASB (upflow anaerobic sludge blanket) tank. The hydrolysis acidification tank and the anaerobic tank are also provided with sludge outlets connected with the sludge tank.
High-efficiency biochemical system
The high-efficiency biochemical system comprises a two-stage denitrification/nitrification treatment system and a tubular MBR device which are connected in sequence; as shown in fig. 2, the two-stage denitrification/nitrification treatment system comprises a first-stage denitrification tank 1, a first-stage nitrification tank 2, a second-stage denitrification tank 3 and a second-stage nitrification tank 4 which are connected in sequence; a submersible stirrer 5 is respectively arranged in the primary denitrification tank 1 and the secondary denitrification tank 3; a jet aerator 8 is arranged in the first-stage nitrification tank 2, the jet aerator 8 is connected with a plurality of reflux pumps 9 arranged outside the first-stage nitrification tank 2 through a valve group, and the reflux pumps 9 are also connected with the first-stage denitrification tank 1; a cooling tower 6 is arranged outside the primary nitrification tank 2, a plate heat exchanger 7 is arranged on a circulating cooling pipeline of the primary nitrification tank 2, and cold water of the plate heat exchanger 7 enters the cooling tower 6 for cooling; and a jet aerator 8 and a carbon source feeding device are arranged in the second-stage nitrification tank 4, the jet aerator 8 is connected with a plurality of reflux pumps 9 arranged outside the second-stage nitrification tank 4 through a valve group, and the reflux pumps 9 discharge water to a tubular MBR device. And the effluent of the tubular MBR device enters a coagulation sedimentation tank of the advanced treatment system. The tubular MBR device is provided with a sludge outlet connected with the sludge tank, and is also provided with a sludge concentrated solution return outlet connected with the first-stage denitrification tank 2 and the second-stage denitrification tank 4.
Advanced treatment system
As shown in fig. 3, the advanced treatment system comprises a coagulation sedimentation tank 10, a primary Fenton fluidized bed 11, a primary Fenton sedimentation tank 12, a denitrification biological fluidized bed 13, a secondary Fenton fluidized bed 14, a secondary Fenton sedimentation tank 15, a denitrification/nitrification biological fluidized bed 16 and an outward discharge sedimentation tank 17 which are connected in sequence; wherein, the sludge outlets at the bottoms of the coagulating sedimentation tank 10, the primary Fenton sedimentation tank 12, the denitrification biological fluidized bed 13, the secondary sedimentation tank 15, the denitrification/nitrification biological fluidized bed 16 and the outward discharge sedimentation tank 17 are connected with the sludge tank of the sludge outward transport system through a reflux pump 9. A flocculating agent dosing device and a PAM dosing device are arranged on the coagulating sedimentation tank 10; the primary Fenton fluidized bed 11 and the secondary Fenton fluidized bed 14 are respectively provided with an air-entrapping device, a sulfuric acid dosing device, a hydrogen peroxide dosing device and a ferrous sulfate dosing device; a liquid alkali dosing device and a PAM dosing device are respectively arranged on the primary sedimentation tank 12 and the secondary sedimentation tank 15; a carbon source adding device is arranged on each of the denitrification biological fluidized bed 13 and the denitrification/nitrification biological fluidized bed 16, and the denitrification biological fluidized bed 13 is filled with sponge filler enriched with denitrifying bacteria; and a PAC dosing device and a PAM dosing device are arranged on the outward discharge sedimentation tank 17.
Sludge outward transport system
The sludge outward transport system comprises a sludge pool and a dehydrator; the sludge outlets of the pretreatment system, the anaerobic system, the MBR system and the advanced treatment system are respectively connected with a sludge tank. The dehydrator can select horizontal spiral shell centrifugal dehydrator, and mud discharges into the sludge impoundment, promotes through the sludge pump and gets into horizontal spiral shell centrifugal dehydrator, dewaters and transports to the regulation and deal with the point in unison after the moisture content is below 80%.
The system during operation of this embodiment, filtration liquid passes through the elevator pump and goes into the grid catch basin, and the purpose of playing the degritting simultaneously keeps in the pond, sets up the elevator pump in the pond and goes into the primary sedimentation pond with sewage pump, and the clear water after the primary sedimentation pond carries out coagulating sedimentation gets into coagulation air supporting pond, and the setting of primary sedimentation pond is before coagulating air supporting pond, can reduce the load of air supporting, avoids the releaser to block up. After the waste water in the coagulation air floatation tank is mixed and reacted, some particulate matters, floating materials, floating slag and floating oil are separated from the water. The water from the air floatation tank flows into the regulating tank to regulate the water quantity and the water quality. Set up in the equalizing basin under water mixer and carry out water quality control, set up hydraulic power agitator pump simultaneously and carry out hydraulic power stirring in order to prevent that the equalizing basin surface of water from piling up the dross and forming the scum layer to waste water.
Waste water passes through the water pump and goes into anaerobic system in the equalizing basin, carries out anaerobic fermentation to the waste water of high concentration, gets rid of most organic pollutant. Effluent of an anaerobic system enters a two-stage MBR system, sequentially flows through a first-stage denitrification tank, a first-stage nitrification tank, a second-stage denitrification tank and a second-stage nitrification tank, is degraded by microorganisms, and simultaneously, by setting multiple points of water inlet of the denitrification tank, large-proportion internal reflux, large-proportion external sludge reflux and other multiple functions, organic matters, ammonia nitrogen and total nitrogen in leachate are degraded and removed under alternate anoxic and aerobic conditions, the leachate treated by a biochemical system unit is subjected to sludge-water separation by ultrafiltration of an external tubular MBR, clear liquid enters an advanced treatment unit for further treatment, and sludge concentrated solution flows back to the nitrification tank or the denitrification tank.
And (3) enabling the effluent of the tubular MBR device to enter a coagulation sedimentation tank, and carrying out coagulation reaction on the wastewater and the poly-iron in the tank to precipitate humic acid in the wastewater, so that CODcr in the wastewater is reduced. The effluent of the coagulating sedimentation tank enters a first-stage Fenton fluidized bed, and H is added2O2、FeSO4And the strong oxidation effect of the Fenton reagent is utilized to oxidize and degrade the organic matters which are difficult to degrade in the wastewater and improve the biodegradability of the wastewater. The effluent of the first-stage Fenton fluidized bed enters a first-stage sedimentation tank, and the wastewater reacts with liquid caustic soda and PAM to form Fe (OH)3The iron ions and other heavy metal ions in the wastewater are precipitated by precipitation. The effluent of the first-stage sedimentation tank enters a denitrification biological fluidized bed, and special sponge filler is filled in the tank, can enrich rich denitrifying bacteria, and utilizes the denitrification effect and an external carbon source to carry out denitrification on TN in the wastewater. The effluent of the denitrification biological fluidized bed sequentially enters a secondary Fenton fluidized bed, a secondary sedimentation tank and denitrification/nitrification biological fluidized bedThe bed is used for treating CODcr and TN in the wastewater through advanced oxidation and biochemical action. The effluent of the denitrification/nitrification biological fluidized bed flows into an external discharge sedimentation tank for further sedimentation so as to ensure that the effluent suspended matters reach the standard.
Sludge generated by the pretreatment system, the anaerobic system, the MBR system and the advanced treatment system is discharged into a sludge tank, is lifted by a sludge pump to enter a horizontal screw centrifugal dehydrator, and is uniformly conveyed to a specified disposal point after being dehydrated to the water content of below 80%.
The design scale of a percolate treatment station of a certain large-scale refuse transfer station (refuse transfer capacity is 2000t/d) is 500m3And d, designing the water quality of inlet water and outlet water according to the following table.
Table 1 design water quality schedule
Serial number Contaminants Design of quality of inlet water
1 Chemical oxygen demand (CODcr) (mg/L) 40000
2 Biochemical Oxygen Demand (BOD)5)(mg/L) 20000
3 Suspended substance (mg/L) 3000
4 Total nitrogen (mg/L) 1500
5 NH3-N(mg/L) 800
6 TP(mg/L) 20
The effluent of the landfill leachate treatment station is discharged to urban sewers, CODcr and BOD5Pollutants such as ammonia nitrogen, TN, TP and SS execute the concentration limit value specified in the pollution control standard of the domestic garbage landfill (GB 16889 and 2008) in the table 2. The specific effluent quality is shown in the following table.
Table 2 design water quality schedule
Figure BDA0002938814600000101
Figure BDA0002938814600000111
The actual water inlet indexes of the project are all within the designed water inlet quality range, and after the project is debugged and tried, the actual water outlet indexes of the percolate treatment station are detailed in the following table.
Table 3 list of actual effluent quality
Serial number Controlling contaminants Emission concentration limit
1 Chroma (dilution multiple) 20~40
2 Chemical oxygen demand (CODcr) (mg/L) 70~90
3 Biochemical Oxygen Demand (BOD)5)(mg/L) 10~20
4 Suspended substance (mg/L) ≤20
5 Total nitrogen (mg/L) 25~40
6 Ammonia nitrogen (mg/L) ≤15
7 Total phosphorus (mg/L) ≤3
8 pH 6.5-9
9 Petroleum products ≤15
10 Animal and vegetable oil ≤100
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims (10)

1. A landfill leachate treatment system is characterized by comprising a sludge outward transportation system, and a pretreatment system, a high-efficiency anaerobic system, a high-efficiency biochemical system and an advanced treatment system which are sequentially connected;
the pretreatment system comprises a grating, a primary sedimentation tank, an air floatation tank and a regulating tank which are connected in sequence;
the efficient anaerobic system comprises a hydrolysis acidification tank, an efficient anaerobic tank and a biogas treatment system which are connected in sequence;
the high-efficiency biochemical system comprises a two-stage denitrification/nitrification treatment system and a tubular MBR device which are connected in sequence; the effluent of the tubular MBR device enters a coagulation sedimentation tank of the advanced treatment system;
the deep treatment system comprises a coagulation sedimentation tank, a multi-stage Fenton fluidized bed, a Fenton sedimentation tank, a biological fluidized bed and an outward discharge sedimentation tank which are connected in sequence; the sludge outlets at the bottoms of the coagulating sedimentation tank, the Fenton sedimentation tank, the biological fluidized bed and the outward discharge sedimentation tank are respectively connected with a sludge tank of a sludge outward transport system; and the clear liquid in the outward discharge sedimentation tank is discharged after reaching the standard.
2. The landfill leachate treatment system of claim 1, wherein the two-stage denitrification/nitrification treatment system comprises a first-stage denitrification tank, a first-stage nitrification tank, a second-stage denitrification tank and a second-stage nitrification tank which are connected in sequence.
3. The landfill leachate treatment system of claim 2, wherein the primary nitrification tank is internally provided with a jet aerator, the jet aerator is connected with a plurality of reflux pumps arranged outside the primary nitrification tank through valves, and the reflux pumps are also connected with the primary denitrification tank; and a cooling tower is arranged outside the primary nitrification tank.
4. The landfill leachate treatment system of claim 2, wherein the secondary nitrification tank is internally provided with a jet aerator and a carbon source feeding device, the jet aerator is connected with a plurality of reflux pumps arranged outside the secondary nitrification tank through valves, and the effluent of the reflux pumps goes to a tubular MBR device.
5. The landfill leachate treatment system of claim 2, wherein the tubular MBR unit is provided with a sludge outlet connected to a sludge tank, and further provided with a sludge concentrate return outlet connected to the primary denitrification tank and the secondary denitrification tank.
6. The landfill leachate treatment system of claim 1, wherein the primary sedimentation tank and the air flotation tank are respectively provided with a sludge outlet connected with a sludge tank; and a PAC dosing device and a PAM dosing device are respectively arranged on the primary sedimentation tank and the air floatation tank.
7. The landfill leachate treatment system of claim 1, wherein the effluent of the conditioning tank enters the primary denitrification tank of the high efficiency biochemical system after passing through the hydrolysis acidification tank and the high efficiency anaerobic tank; the hydrolysis acidification tank and the high-efficiency anaerobic tank are also provided with sludge outlets connected with the sludge tank.
8. The landfill leachate treatment system of claim 1, wherein the coagulating sedimentation tank is provided with a flocculant dosing device and a PAM dosing device; and a liquid caustic soda dosing device and a PAM dosing device are respectively arranged on the Fenton sedimentation tank.
9. The landfill leachate treatment system of claim 1, wherein the Fenton fluidized bed is respectively provided with an air-entrapping device, a sulfuric acid dosing device, a hydrogen peroxide dosing device and a ferrous sulfate dosing device; and carbon source adding devices are arranged on the biological fluidized beds.
10. The landfill leachate treatment system of claim 1, wherein the biological fluidized bed is filled with sponge filler.
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Publication number Priority date Publication date Assignee Title
CN113664023A (en) * 2021-09-10 2021-11-19 无锡时代桃源环保设备有限公司 System and process for purifying sewage by using kitchen waste hydrolysis as denitrification carbon source
CN113860637A (en) * 2021-09-24 2021-12-31 物产中大公用环境投资有限公司 Method and system for treating leachate of refuse transfer station in southern region
CN114560553A (en) * 2021-12-30 2022-05-31 扬州博依特环保科技发展有限公司 Membrane bioreactor using membrane pool backflow as jet aeration power water flow
CN114620887A (en) * 2022-02-24 2022-06-14 重庆昆顶环保科技有限公司 Landfill leachate treatment system and process
CN114590969A (en) * 2022-03-25 2022-06-07 湖南子宏生态科技股份有限公司 Livestock and poultry breeding wastewater treatment system
CN114590969B (en) * 2022-03-25 2023-11-28 湖南子宏生态科技股份有限公司 Livestock and poultry breeding wastewater treatment system
CN115974300A (en) * 2022-11-16 2023-04-18 长沙绿荫科技研究院有限公司 Garbage leachate full-quantitative treatment combined process
CN115974300B (en) * 2022-11-16 2023-11-10 长沙绿荫科技研究院有限公司 Combined process for full quantization treatment of landfill leachate
CN116199394A (en) * 2023-04-10 2023-06-02 广东广深环保科技股份有限公司 Leachate treatment device and method for garbage transfer station

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