CN110950488A - Method for treating fresh leachate of household garbage - Google Patents

Method for treating fresh leachate of household garbage Download PDF

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Publication number
CN110950488A
CN110950488A CN201811128054.0A CN201811128054A CN110950488A CN 110950488 A CN110950488 A CN 110950488A CN 201811128054 A CN201811128054 A CN 201811128054A CN 110950488 A CN110950488 A CN 110950488A
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China
Prior art keywords
tank
water
mud
separation
leachate
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CN201811128054.0A
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Inventor
藏莉莉
官章琴
胡芝伟
赵海军
程伟
张意
张利
刘永华
宋甲文
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Shanghai Xiebu Environmental Protection Technology Co Ltd
Shanghai Zizheng Environment Protection Technology Co ltd
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Shanghai Xiebu Environmental Protection Technology Co Ltd
Shanghai Zizheng Environment Protection Technology Co ltd
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Priority to CN201811128054.0A priority Critical patent/CN110950488A/en
Publication of CN110950488A publication Critical patent/CN110950488A/en
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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
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/28Treatment of water, waste water, or sewage by sorption
    • C02F1/283Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • 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
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/78Treatment of water, waste water, or sewage by oxidation with ozone
    • 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
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • 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

A method for treating fresh leachate of domestic garbage relates to the technology for treating the fresh leachate of the domestic garbage, is suitable for treating the fresh leachate of the domestic garbage in a sewage treatment station with a smaller scale, and is also suitable for treating biochemical industrial wastewater containing high-concentration suspended organic matters. The method adopts the mud-water separation screening device (5) and is provided with the primary flat membrane component (7) and the secondary flat membrane component (11), and separates the suspended organic pollutants of the fresh leachate of the domestic garbage from the sewage treatment system through multi-stage treatment, thereby ensuring the efficient and stable operation of the sewage treatment system, and further realizing that the daily treated water amount is less than 50m3The classified garbage treatment station can treat the fresh leachate of the domestic garbage according to the sewage discharge standard and then discharge the leachate through a nano pipe or directly discharge the water.

Description

Method for treating fresh leachate of household garbage
Technical Field
A method for treating fresh leachate of domestic garbage relates to the technology for treating the fresh leachate of the domestic garbage, is suitable for treating the fresh leachate of the domestic garbage in a sewage treatment station with a smaller scale, and is also suitable for treating biochemical industrial wastewater containing high-concentration suspended organic matters.
Background
In many regions of China, the climate is humid, some regions are influenced by living habits, the moisture content of wet garbage is high, high-concentration leachate is discharged in the wet garbage treatment process, the concentration of organic matters and suspended matters reaches hundreds of times of the concentration of domestic sewage, the concentration of nitrogen and phosphorus is at least dozens of times of the concentration of the domestic sewage, and the concentration of the nitrogen and phosphorus is far more than the requirement of the current national standard, namely 'the sewage is discharged into town sewer water quality standard GB/T31962-2015', so that the garbage leachate discharge of each garbage transfer station, garbage classification collection station, garbage classification treatment station and the like is in a serious overproof discharge state. The landfill leachate belongs to fresh landfill leachate and is characterized by high pollutant concentration, high suspended matter concentration, good biodegradability and easy rottenness. The existing garbage leachate treatment technology is difficult to deal with the garbage leachate of domestic garbage landfill sites and incineration sites due to extremely long process flow, high investment, complex operation and maintenance and extremely high treatment cost. The waste water treatment method is more difficult to deal with for waste water treatment which is generated by small-scale waste transfer stations and classified waste treatment stations and has less water quantity and high-concentration organic matters and suspended matters.
The classified collection and treatment of the urban garbage are important measures for reducing, harmlessly treating and recycling the household garbage. At present, the methodFor the treatment of high-concentration biochemical organic wastewater, the mainstream process is anaerobic biological treatment and aerobic biological treatment, the anaerobic biological treatment process can recover energy, is suitable for large-scale treatment of high-concentration organic wastewater, has high safety requirement in operation, and has a daily treated water volume of less than 50m3The classified garbage disposal station of the/d is obviously not suitable, the level of garbage classification management cannot meet the requirement, meanwhile, a plurality of garbage stations are built in residential areas, and the fire safety distance is not enough. The combined materialization, combined biochemistry and reverse osmosis processes which are frequently adopted in the landfill leachate treatment cannot meet the small-scale landfill leachate treatment, because the concentrated solution of reverse osmosis cannot solve the outlet problem. The nature of the percolate of the garbage incineration plant is closer to that of the small-scale classified garbage percolate, but various matched devices of the garbage incineration plant are complete, for example, the sludge generated by the percolate of the incineration plant is simple to go out and is directly incinerated, the configuration of the dehydrator can be strictly selected according to the specification, and the configuration condition of the high-technology device cannot be obtained when the percolate generated by the small-scale classified garbage is generated.
The fresh leachate of domestic garbage contains high-concentration organic matters and suspended matters, the biodegradability of the leachate is good, the pollutants caused by the suspended matters account for more than 50% of the total pollutant content in the wastewater, the suspended matters not only cause the problems of sludge deposition in the equipment, blockage and winding of pipelines in and out of the equipment, but also cause the difficulty of biochemical treatment of sewage. The classical sewage treatment process aims at pollutants which are mainly soluble pollutants, so a primary sedimentation tank is generally arranged for sewage plant inlet water, sludge or suspended pollutants are treated by means of composting, sludge anaerobic digestion, aerobic digestion and other devices, the difference of process parameters, design points and the like of the sludge or the suspended pollutants is large and difficult to unify, particularly, factors causing the change of the pollutants are complex due to the fact that the hydrolysis of the suspended matters is influenced, and high attention must be paid to the treatment of percolate.
The small-scale classification landfill leachate treatment work also has the following adverse factors:
1. the dehydrator is adopted, so that the investment is too large, the operation cost is very high due to the fact that the suspended solid content of the landfill leachate entering the dehydrator is low, the cost performance is too poor, the management is complex, once the equipment is damaged, very professional maintenance service is needed, and meanwhile, the selection range of the small-scale dehydrator is extremely limited.
2. The coagulating sedimentation method is selected, because the biodegradability of the leachate is good, sludge is easy to float upwards anaerobically, the solid-liquid separation effect is influenced, and meanwhile, the acidification phenomenon of the high-concentration leachate is serious, a coagulating agent is required to be added, alkali liquor is required to be added to adjust the pH value, the agent consumption is large, the salinity of the wastewater is greatly increased, and the subsequent biological treatment is influenced.
3. The air floatation process is small in scale, the problem that air floatation equipment is too complex is also faced, the cost performance is not high, meanwhile, a plurality of pollutants in percolate are not suitable for air floatation and easy to deposit at the bottom, and finally, the air floatation also has the problem of adding the medicament for coagulating sedimentation
4. The single membrane separation is adopted to face the problem of high solid content of the concentrated solution, the membrane permeation resistance of the membrane separation is increased along with the progress of the membrane concentration, the separation capacity is reduced rapidly, the concentrated solution needs additional equipment, such as a dehydrator and the like, to carry out dehydration treatment on the concentrated high solid content mixed solution, and the over high solid content of the membrane concentrated solution is avoided.
Disclosure of Invention
The invention aims to provide a treatment method capable of effectively treating fresh landfill leachate, which carries out certain interception, concentration and dehydration on suspended pollutants with larger particle sizes or certain adhesiveness in the entering leachate through a mud-water separation sieve, lightens the solid load of solid-liquid separation of a subsequent primary flat membrane module, ensures the normal performance of the flat membrane separation performance, carries out denitrification and organic matter removal on the effluent of the primary flat membrane module by utilizing an A/A/O-MBR reactor, and achieves the purposes of reaching relevant discharge standards and bringing the effluent into a municipal drainage pipe network (nano-pipe discharge) or directly discharging water.
The invention is realized by the following steps:
the invention relates to a method for treating fresh leachate of domestic garbage, which is realized by a water collecting well, a lifting pump arranged in the water collecting well, an adjusting tank, a water inlet pump arranged in the adjusting tank, a mud-water separation screening device, a primary membrane separation tank, a primary flat membrane component and a suction pump arranged in the primary membrane separation tank, an anaerobic hydrolysis biological tank, an anoxic tank, an aerobic tank, a secondary flat membrane component, a suction pump and a dosing system, wherein the mud-water separation screening device can select screens with different meshes, intercepts, concentrates and dehydrates suspended matters with the particle size larger than the aperture of the screen mesh, enters a garbage can as garbage, and is finally reused for garbage composting or other modes for treatment, and liquid and small-particle substances with the particle size smaller than the aperture of the screen mesh can penetrate through the screens to form effluent; the first-stage flat membrane component and the second-stage flat membrane component pump water out through a suction pump, aeration devices are arranged at the bottoms of the first-stage flat membrane component and the second-stage flat membrane component and used for controlling membrane surface pollution, and a dosing system is a membrane chemical cleaning dosing pipeline system so as to ensure that membrane in-situ chemical cleaning is carried out on the membranes after the membranes are used for a certain period; the anaerobic hydrolysis biological tank, the anoxic tank, the aerobic tank and the secondary flat plate membrane component form a flat plate membrane A/A/O-MBR process, the anaerobic hydrolysis tank and the anoxic tank ensure the mass transfer effect through perforated pipe aeration stirring or mechanical stirring, the anoxic tank continuously returns sludge mixed liquor to the anaerobic hydrolysis biological tank to maintain the proper mixed liquor concentration, the membrane area of the secondary flat plate membrane component is provided with a reflux pump to continuously return the sludge mixed liquor to the anoxic tank to provide nitrate and nitrite, denitrification is realized by utilizing organic matters entering the anoxic tank, the aerobic tank plays roles in organic matter degradation and ammonia nitrogen oxidation, the secondary flat plate membrane component realizes final mud-water separation, and the effluent is discharged after reaching the standard.
For treating high-concentration organic matter suspended solids by fresh landfill leachate, the invention adopts the mud-water separation sieve for pretreatment, can greatly reduce the concentration of suspended organic matters in subsequent inlet water, avoids the phenomenon that suspended solids are easy to float upwards due to anaerobic fermentation of sludge in the conventional natural precipitation or coagulating precipitation method, and influences the solid-liquid separation effect, and also avoids the problems of complex mechanical management, high difficulty and high investment of a sludge dehydrator and an air floatation machine, and the mud-water separation sieve has multiple purposes and can simultaneously solve the problems of suspended matter concentration dehydration and MBR sludge concentration dehydration intercepted by a primary flat plate membrane component.
The effluent treated by the mud-water separation screen separator is lifted by gravity flow or a submersible pump to enter a subsequent primary membrane separation tank, solid-liquid separation is carried out in the primary membrane separation tank by utilizing a built-in primary flat membrane module, only soluble pollutants are ensured to be in the effluent, and the effluent after membrane separation enters a subsequent A/A/O-MBR, thereby creating conditions for the subsequent A/A/O-MBR water treatment to reach the standard. The suspended pollutants intercepted by the first-stage flat membrane are accumulated continuously, concentration balance is maintained through sludge discharge, membrane surface pollution control of the flat membrane is guaranteed within a reasonable range, normal operation of a system is guaranteed, high-concentration suspended matters intercepted by the first-stage flat membrane are discharged into a regulating tank, the suspended matters are separated again through a sludge-water separation screening device and finally break away from a sewage treatment system, a flocculating agent can be added into a water collecting well according to intercepting efficiency of the sludge-water separation screening device, the size of suspended particles is increased, and the removal rate of the suspended pollutants by the sludge-water separation screening device is improved.
In the A/A/O-MBR tank, the water separated by the primary flat membrane flows through an anaerobic hydrolysis tank, an anoxic/denitrification tank, an aerobic aeration/nitrification tank and a flat membrane solid-liquid separation tank, and is finally separated and discharged out of the system through a secondary flat membrane component. Soluble organic matters in the water separated by the first-level flat membrane are firstly utilized as a carbon source by denitrifying bacteria to realize TN removal, then residual organic matters are thoroughly decomposed by aerobic microorganisms, meanwhile, ammonia nitrogen is decomposed and converted into nitrate nitrogen by nitrifying bacteria and continuously flows back to a denitrifying tank for denitrification, and finally, the discharged water is subjected to membrane separation to realize standard discharge.
When the concentration of the TP of the inlet water is higher and the inlet water still cannot be discharged according to the standard by virtue of a mud-water separation screen, primary flat membrane separation and A/A/O-MBR, the feeding system can be used for directly feeding the TP into the A/A/O-MBR to realize the high-efficiency removal of the TP.
A method for treating fresh leachate of household garbage comprises the following steps:
the method comprises the following steps: a treatment device for fresh leachate of household garbage is started, the fresh leachate enters a water collecting well, enters an adjusting tank through a lifting pump, and enters a mud-water separation screen separator through a water inlet pump;
step two: the mud-water separation screening device operates, the separated wastewater enters a primary membrane separation tank, and suspended particles intercepted by a screen in the mud-water separation screening device are gradually gathered, formed and dehydrated into sludge lumps, and the sludge lumps fall into a garbage collection barrel to be transported outwards for subsequent treatment;
step three: the wastewater pretreated by the mud-water separation screen continues to be deeply pretreated in the primary membrane separation tank, the concentration of suspended matters in the primary membrane separation tank is controlled within 80g/L, and the separation efficiency of the primary flat membrane module is prevented from being influenced;
separating clear liquid from the suction pump through the primary flat membrane component, wherein pollutants in the clear liquid are all composed of soluble pollutants, suspended pollutants and colloidal pollutants intercepted by the primary flat membrane component are gathered and concentrated in the primary membrane separation tank, and the concentration of the suspended pollutants is controlled within a certain reasonable range through continuous or periodic sludge discharge;
step four: high-concentration sludge mixed liquor discharged from the primary membrane separation tank enters a regulating tank, is lifted by a built-in water inlet pump to enter a mud-water separation screening device for sludge concentration and dehydration, and is transported outside after the sludge concentration and dehydration;
step five: clear liquid separated by the first-level flat plate membrane component enters a flat plate membrane A/A/O-MBR reactor formed by an anaerobic hydrolysis biological tank, an anoxic tank, an aerobic tank and a second-level flat plate membrane component subsequently, the biodegradability of wastewater is mainly promoted in the anaerobic hydrolysis biological tank, partial organic matter removal and TN removal are completed in the anoxic tank, organic matter decomposition and ammonia nitrogen oxidation are mainly performed in the aerobic tank, solid-liquid separation is mainly realized in the membrane tank, and sludge mixed liquid flows back into the anoxic tank to provide nitrate nitrogen and nitrite nitrogen, so that membrane effluent can reach the municipal pipe network and pipe standard.
Step six: when the final effluent is required to reach the discharge standard of national urban sewage plants, the membrane effluent of the MBR is subjected to ozone removal and chromaticity improvement for biodegradability, then enters a zeolite biological bed for treatment to realize further removal of COD, ammonia nitrogen and total nitrogen, and finally a small amount of residual organic matters are removed through activated carbon adsorption, so that the final effluent meets the direct discharge requirement.
Compared with the prior art, the invention has the following advantages:
1) the pretreatment equipment adopts a mud-water separation screening device, so that the problem of pretreatment of inlet water is solved, various pollutants with the particle size larger than 0.4mm are completely separated out of a system, the operation and maintenance faults such as blockage and deposition of subsequent equipment are avoided, the solid load of subsequent advanced pretreatment equipment is reduced, the most favorable condition is created for standard treatment of high-concentration organic wastewater, and meanwhile, the screening device also has the functions of concentration and dehydration of intercepted organic particles, does not need medicament conditioning, and provides conditions for the recycling treatment of final solid organic matters;
2) the adopted primary flat membrane separation not only can be suitable for solid-liquid separation of wastewater under ultrahigh particle concentration, and has good membrane pollution resistance, but also is very convenient for in-situ/off-line cleaning after membrane pollution, and effluent can completely ensure the influence of suspended pollutants, is clear and transparent, and reduces water quality pressure for the following up-to-standard operation of MBR;
3) the sludge-water separation screening device or the flat membrane separation device is the efficient separation equipment with the smallest occupied area, and the combined fresh landfill leachate standard treatment technology has the characteristic of small occupied area and is particularly suitable for classified collection treatment stations of garbage in residential areas;
4) the integral treatment process equipment is a self-forming system, comprises sewage treatment and complex pretreatment, and also has the functions of sludge concentration and dehydration without complex dehydration machinery, coagulating sedimentation or air floatation and other equipment;
5) the whole system is compact in structure, complete in function, good in water quality of discharged water, capable of greatly guaranteeing operability of managers, fully automatic in operation, high in standard-reaching stability and free of professional management in daily life.
Drawings
The attached drawing is a schematic diagram of the treatment method of the fresh leachate of the domestic garbage, wherein:
FIG. 1 and FIG. 2 are schematic views of the process for treating fresh leachate of domestic garbage according to the present invention, wherein the treated effluent meets the requirements of the existing national "Water quality Standard for Sewage discharge into urban sewer GB/T31962-;
fig. 3 and 4 are schematic diagrams of a process for treating fresh leachate of domestic garbage, the treated effluent meets the requirements of the existing national pollutant discharge standard GB18918-2002 of urban sewage treatment plants, and the water can be directly discharged.
In the figure, a water collecting well 1, a lifting pump 2, an adjusting tank 3, a water inlet pump 4, a mud-water separation screen 5, a primary membrane separation tank 6, a primary flat membrane component 7, an anaerobic hydrolysis biological tank 8, an anoxic tank 9, an aerobic tank 10, a secondary flat membrane component 11, a dosing system 12, an ozone oxidation tank 13, a zeolite biofilter 14 and an activated carbon adsorption tank 15 are arranged.
Detailed Description
The method for treating fresh leachate of domestic garbage is further described with reference to the accompanying drawings and specific examples. Respectively treating the fresh leachate of the domestic garbage according to the standard discharge standard of nano-tubes and the standard of direct discharge water body: fig. 1 and 2 show that the method for treating the fresh leachate of the domestic garbage comprises a water collecting well 1, a lifting pump 2, a regulating tank 3, a water inlet pump 4, a mud-water separation and screening device 5, a primary membrane separation tank 6, a primary flat membrane component 7, an anaerobic hydrolysis biological tank 8, an anoxic tank 9, an aerobic tank 10, a secondary flat membrane component 11 and a dosing system 12. Wherein the anaerobic hydrolysis biological tank 8, the anoxic tank 9, the aerobic tank and the secondary flat membrane component form a flat membrane A/A/O-MBR treatment process.
Referring to fig. 1 and fig. 2, the process of treating the fresh leachate of the domestic garbage according to the method for treating the fresh leachate of the domestic garbage comprises the following steps:
the method comprises the following steps: in the water collecting well 1, when the liquid level reaches the starting liquid level of the lifting pump 2, the lifting pump 2 pumps the wastewater into the regulating tank 3, and after homogenization and uniform amount, the wastewater is pumped into the mud-water separation screening device 5 through the water inlet pump 4;
step two: when the mud-water separation screen 5 operates, the effluent enters a primary membrane separation tank 6 by gravity flow or is lifted by a water pump, and the intercepted suspended matters on the screen of the mud-water separation screen 5 are concentrated, dehydrated and dropped into a garbage can;
step three: when the liquid level of the treated water entering the primary membrane separation tank 6 reaches the starting liquid level of a suction pump, the suction pump starts to operate, the effluent of the primary flat membrane component 7 is lifted to an anaerobic hydrolysis biological tank 8 through the suction pump, and when the sludge concentration of the primary membrane separation tank 6 is too high, the residual suspended organic sludge is discharged into the regulating tank 3 by gravity flow and is treated by the sludge-water separation sieve 5 again;
step four: the wastewater entering the anaerobic hydrolysis biological tank 8 is biologically treated by an anoxic tank 9 and an aerobic tank 10, is finally subjected to solid-liquid separation by a secondary flat membrane component 11 and is finally discharged by a nano tube reaching the standard, a return pump in the area of the secondary flat membrane component returns a membrane sludge mixed solution to the anoxic tank 9, meanwhile, residual sludge is discharged into the regulating tank 3, and the sludge mixed solution is continuously returned to the anaerobic hydrolysis biological tank 8 by the anoxic tank 9.
Fig. 3 and 4 show that the method for treating the fresh leachate of the domestic garbage comprises a water collecting well 1, a lifting pump 2, a regulating tank 3, a water inlet pump 4, a mud-water separation and screening device 5, a primary membrane separation tank 6, a primary flat membrane component 7, an anaerobic hydrolysis biological tank 8, an anoxic tank 9, an aerobic tank 10, a secondary flat membrane component 11, a dosing system 12, an ozone oxidation tank 13, a zeolite biological filter bed 14 and an active carbon adsorption tank 15. Wherein the anaerobic hydrolysis biological tank 8, the anoxic tank 9, the aerobic tank 10 and the secondary flat membrane component 11 form a flat membrane A/A/O-MBR treatment process.
The invention relates to a method for treating fresh leachate of household garbage, which comprises the following steps:
the method comprises the following steps: in the water collecting well 1, when the liquid level reaches the starting liquid level of the lifting pump 2, the lifting pump 2 pumps the wastewater into the regulating tank 3, and after homogenization and uniform amount, the wastewater is pumped into the mud-water separation screening device 5 through the water inlet pump 4;
step two: the mud-water separating and screening device 5 operates simultaneously, the effluent enters a primary membrane separation tank 6 through gravity flow or lifting by a water pump, and the intercepted suspended matters on the screen of the mud-water separating and screening device 5 are concentrated, dehydrated and dropped into a garbage can;
step three: when the liquid level of the primary membrane separation tank 6 reaches the starting liquid level of a suction pump, the suction pump starts to operate, the effluent of the primary flat membrane component 7 is lifted to the anaerobic hydrolysis biological tank 8 through the suction pump, and when the sludge concentration of the primary membrane separation tank 6 is too high, the residual suspended organic sludge is discharged into the regulating tank 3 by gravity flow and is treated by the sludge-water separation sieve 5 again; step four: the wastewater entering the anaerobic hydrolysis biological tank 8 is biologically treated by an anoxic tank 9 and an aerobic tank 10, and finally water is separated by solid-liquid separation of a secondary flat membrane component 11, a membrane area sludge mixed liquor is simultaneously returned to the anoxic tank 9 by a return pump in the area where the secondary flat membrane component is located, residual sludge is discharged into the regulating tank 3, and the sludge mixed liquor is continuously returned to the anaerobic hydrolysis biological tank 8 by the anoxic tank 9.
Step five: the decolorized wastewater treated by the ozone oxidation tank 13 enters a zeolite biological filter bed 14 for treatment, so that ammonia nitrogen is further removed, partial denitrification is carried out simultaneously, and the concentration of ammonia nitrogen and TN in the effluent is reduced;
step six: the wastewater passing through the zeolite biological filter bed 14 can be directly discharged according to a nano-tube discharge standard under most conditions, and when the COD of the inlet water is too high, the COD of the outlet water exceeds 50mg/L, the outlet water of the zeolite biological filter bed 14 is treated by an activated carbon adsorption tank (15) and finally reaches the standard to be discharged.
Example of the implementation
1. Embodiment 1
The scale of the fresh leachate of the household garbage to be treated is 8m3D, COD load 1kg/m3D, after the treatment of the fresh leachate of the domestic garbage by the method, the effluent COD and NH3The concentration of N, TN and TP is 41-60 mg/L, 0.5-3.3 mg/L, 9-14 mg/L and 0.4-0.5 mg/L.
2. Example II
The scale of the fresh leachate for treating the household garbage is designed to be 3m3D, COD load 3.5kg/m3D, treating the fresh leachate of the domestic garbage by using the treatment method of the invention on the COD and NH of the inlet water3When the concentration of-N, TN and TP is 53900-72900, 1158-1511, 1373-2231 and 262-556 mg/L, the treated effluent water is COD and NH3The concentration of N, TN and TP is 43-54 mg/L, 0.3-0.4 mg/L, 3.3-23 mg/L and 0.64-0.82 mg/L.

Claims (4)

1. A method for treating fresh leachate of household garbage comprises a water collecting well (1), a lifting pump (2), a regulating tank (3), a water inlet pump (4), a mud-water separation sieve (5), a primary membrane separation tank (6), a primary flat membrane component (7), an anaerobic hydrolysis biological tank (8), an anoxic tank (9), an aerobic tank (10), a secondary flat membrane component (11) and a dosing system (12); ozone oxidation pond (13), zeolite biological filter bed (14), active carbon adsorption pond (15), its characterized in that:
the treatment process of the fresh leachate of the domestic garbage is as follows:
the method comprises the following steps: fresh landfill leachate to be treated enters a water collecting well (1), enters a regulating tank (3) through a lifting pump (2), and enters a mud-water separation screening device (5) through a water inlet pump (4);
step two: the mud-water separation screening device (5) operates, the separated wastewater enters the primary membrane separation tank (6), and suspended particles intercepted by the screen in the mud-water separation screening device (5) are gradually gathered, formed and dehydrated into sludge clusters, and the sludge clusters fall into the garbage collection barrel to be transported outside for subsequent treatment.
Step three: the wastewater pretreated by the mud-water separation screen (5) is continuously subjected to advanced pretreatment in a primary membrane separation tank (6), solid-liquid separation is realized by a suction pump through a primary flat membrane component (7) to separate clear liquid, pollutants of the clear liquid are all composed of soluble pollutants, suspended pollutants and colloidal pollutants intercepted by the primary flat membrane component (7) are gathered and concentrated in the primary membrane separation tank (6), and the concentration of the suspended pollutants is controlled within 80g/L by continuous or periodic mud discharge;
step four: high-concentration sludge mixed liquor discharged from a primary membrane separation tank (6) enters an adjusting tank (3), is lifted by a water inlet pump (4) and enters a mud-water separation screening device (5) for sludge concentration and dehydration, and the sludge is transported outside after the sludge concentration and dehydration;
step five: clear liquid separated by the first-stage flat membrane component (7) enters a flat membrane A/A/O-MBR reactor formed by an anaerobic hydrolysis biological tank (8), an anoxic tank (9), an aerobic tank (10) and a second-stage flat membrane component (11) in a follow-up manner, the biodegradability of wastewater is improved in the anaerobic hydrolysis biological tank (8), partial organic matter removal and TN removal are completed in the anoxic tank (9), and organic matter decomposition and ammonia nitrogen oxidation are carried out in the aerobic tank (10).
2. The method for treating fresh leachate of domestic garbage according to claim 1, wherein the method comprises the following steps: adopting a mud-water separation screen (5), treating the fresh landfill leachate to be treated by the mud-water separation screen (5) and then entering a primary membrane separation tank (6).
3. The method for treating fresh leachate of domestic garbage according to claim 1, wherein the method comprises the following steps: redundant sludge in the primary membrane separation tank (6) is discharged into the adjusting tank (3) and is lifted by the water inlet pump (4) again to enter the mud-water separation screening device (5) for solid-liquid separation.
4. The method for treating fresh leachate of domestic garbage according to claim 1, wherein the method comprises the following steps: the effluent of the first-stage membrane separation tank (6) is subjected to solid-liquid separation by a first-stage flat membrane module (7), so that only soluble pollutants are contained in the effluent, and conditions are created for the subsequent water treatment of A/A/O-MBR to reach the standard.
CN201811128054.0A 2018-09-27 2018-09-27 Method for treating fresh leachate of household garbage Pending CN110950488A (en)

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Citations (8)

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