CN112456728B - System and process for full-scale treatment of landfill leachate - Google Patents

System and process for full-scale treatment of landfill leachate Download PDF

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Publication number
CN112456728B
CN112456728B CN202011163185.XA CN202011163185A CN112456728B CN 112456728 B CN112456728 B CN 112456728B CN 202011163185 A CN202011163185 A CN 202011163185A CN 112456728 B CN112456728 B CN 112456728B
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tank
aeration
treatment
pipe
shell
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CN112456728A (en
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夏天华
王添火
雷孝进
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Yichen Environmental Protection Technology Xiamen Co ltd
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Yichen Environmental Protection Technology Xiamen Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention discloses a system and a process for full treatment of landfill leachate, belonging to the technical field of water treatment, and the system for treatment of the landfill leachate comprises a grid tank, a regulating tank, a first anoxic tank, a first aerobic tank, a second anoxic tank and a second aerobic tank which are sequentially connected through pipelines, external ultrafiltration membrane organizes ware, the electric catalytic oxidation pond, the sedimentation tank, the light catalytic oxidation pond, and the bological aerated filter, the inside protrusion in upper portion of shells inner wall forms and keeps off the ring, the inner wall coating of casing has the epoxy coating, the lateral wall that the epoxy end sealed, and the partly of lateral wall all is connected with the epoxy coating down, the upper end of many hollow fiber membrane bundles all is fixed in the epoxy end and seals, the lower extreme of many hollow fiber membrane bundles all seals the setting, and can freely swing, stoste feed liquor pipe's inside can be dismantled and inlay and be equipped with stoste filtration piece. The system and the process for treating the landfill leachate have high treatment efficiency and the hollow fiber membrane component has long service life.

Description

System and process for full-scale treatment of landfill leachate
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a system and a process for full treatment of landfill leachate.
Background
The landfill leachate is high-concentration organic wastewater which is formed by deducting the saturated water holding capacity of garbage and a soil covering layer from water contained in the garbage in a garbage landfill, rain, snow and water entering the landfill and other water and passing through the garbage layer and the soil covering layer. The landfill leachate has the characteristics of high COD, high salinity, high ammonia nitrogen, high heavy metal and the like, can change along with the landfill composition of the landfill, seasonal climate and the service life of the landfill, and becomes high-concentration organic wastewater which is difficult to treat in the water quality treatment at the present stage.
For the treatment of landfill leachate, two process paths are mainly adopted at present, one is a two-stage DTRO process, and the other is a biochemical process plus a membrane bioreactor (MBR + NF + RO) process, and both the two processes need to further treat membrane concentrated solution, so that the existing percolate concentrated solution needs to be further reduced or further concentrated and disposed, and even has urgent market demands on zero discharge of the concentrated solution.
In the treatment of the landfill leachate, the concentrated solution is required to be further treated, and the requirement on a membrane component is high. The two ends of a hollow fiber membrane bundle of the existing hollow fiber membrane component are fixedly arranged, the hollow fiber membrane bundle with the two fixed ends has poor pollution resistance in actual operation, pollutants are easy to accumulate on the hollow fiber membrane bundle and are difficult to discharge, and the cleaning and regeneration effect of the membrane is poor; the wastewater after biochemical treatment is not further filtered before entering the hollow fiber membrane component, so that membrane blockage is easily caused, the treatment efficiency is influenced, and the service life of the hollow fiber membrane component is greatly reduced; the heat resistance of the hollow fiber membrane module and the connection stability of the end seals also affect the service life of the hollow fiber membrane module.
Disclosure of Invention
The invention aims to provide a system and a process for full-scale treatment of landfill leachate, which are used for deeply treating concentrated solution obtained by an external ultrafiltration membrane group device, the effluent is discharged up to the standard, the treatment efficiency is high, pollutants are not easy to accumulate on a hollow fiber membrane bundle, and the service life of the hollow fiber membrane module is long.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a system for full-scale treatment of landfill leachate, which comprises a grid tank, an adjusting tank, a first anoxic tank, a first aerobic tank, a second anoxic tank, a second aerobic tank, an external ultrafiltration membrane group device, an electrocatalytic oxidation tank, a sedimentation tank, a photocatalytic oxidation tank and an aeration biological filter which are sequentially connected through pipelines, wherein membrane components of the external ultrafiltration membrane group device are hollow fiber membrane components, each hollow fiber membrane component comprises a shell, an end cover, an epoxy resin end seal, a plurality of hollow fiber membrane bundles, an epoxy resin coating, a stock solution inlet pipe, a stock solution filtering piece, a connecting pipe, a permeate liquid outlet pipe and a concentrated liquid outlet pipe, the end cover is in threaded sealing connection with the top of the shell, the side wall of the end cover is fixedly communicated with the permeate liquid outlet pipe, the upper part of the inner wall of the shell protrudes inwards to form a baffle ring, the inner wall of the shell is coated with the epoxy resin coating, and the epoxy resin end seal is arranged inside the shell, and be located the top that keeps off the ring, the lateral wall of epoxy end seal, and a part of lower lateral wall all is connected with the epoxy coating, the upper end of many hollow fiber membrane bundles all is fixed in the epoxy end seal, and communicate with the end cover, the lower extreme of many hollow fiber membrane bundles all seals the setting, and can freely swing, the fixed intercommunication of a lateral wall of casing has stoste feed liquor pipe, the fixed intercommunication of another lateral wall of casing has the concentrate drain pipe, the inside of stoste feed liquor pipe can be dismantled and inlay and be equipped with stoste filtration piece, connecting pipe thread seal connects in the feed liquor department of stoste feed liquor pipe, and support stoste filtration piece.
Preferably, the stock solution filter piece includes placing shell, filter material and gets and put the post, is equipped with the filter material in placing the shell, has seted up a plurality of water holes on the end wall of placing the shell, gets the one end of putting the post and is located placing the shell, and is fixed in placing the end wall center of shell, gets the other end of putting the post and extends outside placing the shell.
Preferably, the filter material comprises limestone and activated carbon, and the limestone and the activated carbon are sequentially laid layer by layer along the water inlet direction.
Preferably, the limestone and activated carbon are laid in a thickness ratio of 2: 3.
Preferably, the feed end of the stock solution feed pipe is provided with a step part for installing the stock solution filter.
Preferably, the inner wall of the connecting pipe is projected inwards with a butting part for butting against the stock solution filtering piece.
Preferably, the hollow fiber membrane module further comprises an air inlet pipe and an aeration disc, the air inlet pipe is fixed on the bottom wall of the shell, one end of the air inlet pipe extends to the inside of the shell and is fixed with the aeration disc, the aeration disc is located below the hollow fiber membrane bundle, a plurality of first aeration holes are formed in the top wall of the aeration disc, and the other end of the air inlet pipe is communicated with the aeration equipment.
Preferably, the top center position of aeration dish is fixed with the aeration pipe, and the aeration pipe is enclosed including a plurality of hollow fiber membrane bundles, and the top of aeration pipe extends to and is close to epoxy end seal, has seted up a plurality of second aeration holes on the aeration pipe.
Preferably, the plurality of second aeration holes are arranged along the circumferential direction of the aeration pipe at equal intervals and are arranged along the axial direction of the aeration pipe at equal intervals, and the plurality of first aeration holes are arranged outside the aeration pipe in a radioactive mode.
The invention also provides a process for the full treatment of landfill leachate, which adopts the system for the full treatment of landfill leachate as claimed in any one of the above claims to carry out the treatment, and comprises the following steps: s1: pretreatment, sending landfill leachate into the grid pond and filtering, entering the adjusting tank through the landfill leachate after the filtration of the grid pond for homogenization treatment, S2: biochemical reaction treatment, the landfill leachate after the homogenization treatment sequentially passes through a first anoxic tank, a first aerobic tank, a second anoxic tank and a second aerobic tank to carry out multistage denitrification and nitration treatment, S3: and (3) the effluent of the second aerobic tank is pressurized and sent to an external ultrafiltration membrane group device for solid-liquid separation to obtain a permeate and a concentrated solution, and the permeate is discharged and collected, S4: and (4) sending the concentrated solution obtained in the step (S3) into an electrocatalytic oxidation tank for further degrading organic matters, S5: sending the effluent of the electrocatalytic oxidation tank into a sedimentation tank for sedimentation treatment, and S6: send into the supernatant of sedimentation tank in the photocatalytic oxidation pond and carry out oxidative degradation and handle, reduce aquatic COD concentration, S7: and (3) delivering the effluent of the photocatalytic oxidation tank into an aeration biological filter for treatment, and discharging the effluent up to the standard.
The invention has the beneficial effects that:
1. the concentrated solution obtained by the external ultrafiltration membrane module is subjected to advanced treatment by adopting the processes of electrocatalytic oxidation, precipitation, photocatalytic oxidation treatment and aeration biological treatment, the effluent is discharged up to the standard, the treatment efficiency is high, pollutants are not easy to accumulate on the hollow fiber membrane bundle, and the hollow fiber membrane module has long service life.
2. The arrangement of the epoxy resin coating not only improves the heat resistance of the hollow fiber membrane component, but also can form more stable connection with the epoxy resin end seal, further improves the connection stability of the epoxy resin end seal, and prolongs the service life of the hollow fiber membrane component.
3. The connection surface of the epoxy resin end seal is improved through the arrangement of the baffle ring, and then the connection stability of the epoxy resin end seal is improved.
4. The lower extreme of many hollow fiber membrane bundles all seals the setting, and can freely swing for the pollutant is difficult for piling up on hollow fiber membrane bundle, and the discharge pollutant of being convenient for, antipollution ability is strong, and the washing regeneration of membrane is respond well.
5. Through the setting of dope filtering piece to intaking filtration treatment, avoid the microorganism to adhere to in hollow fiber membrane bundle and cause the jam to can the deodorization, detach harmful gas, get rid of soluble organic matter, be favorable to subsequent processing, improve the treatment effeciency.
6. Through the setting of connecting pipe not only be convenient for with outside pipe connection, filter the piece to the stoste moreover and play limiting displacement.
7. Through the setting that the aeration dish combines the aeration pipe, realize horizontal and vertical aeration and combine to the aeration scope is wider, and is better to the disturbance effect of water.
8. A plurality of second aeration holes are arranged along aeration pipe circumference equidistance interval, and are arranged along aeration pipe axial equidistance interval, and a plurality of first aeration holes are the radioactivity and arrange outside the aeration pipe for the aeration is better even.
Drawings
Fig. 1 is a system block diagram of the system for landfill leachate total treatment of the present invention.
Fig. 2 is a schematic front view of the hollow fiber membrane module of the present invention.
FIG. 3 is a schematic diagram of the matching structure of the raw liquid inlet pipe, the raw liquid filter element and the connecting pipe according to the present invention.
Fig. 4 is a left side view of the structure of the placing shell of the invention.
Fig. 5 is a schematic front view of the filter material of the present invention.
Fig. 6 is a schematic top view of the aeration disk and the aeration pipe according to the present invention.
The labels in the figures are: 1-a grid pool, 2-an adjusting pool, 3-a first anoxic pool, 4-a first aerobic pool, 5-a second anoxic pool, 6-a second aerobic pool, 7-an external ultrafiltration membrane group device, 8-a hollow fiber membrane component, 81-a shell, 82-an end cover, 83-an epoxy resin end seal, 84-a hollow fiber membrane bundle, 85-an epoxy resin coating, 86-a stock solution inlet pipe, 861-a step part, 87-a stock solution filter part, 871-a placing shell, 872-a filter material, 8721-limestone, 8722-activated carbon, 873-a taking and placing column, 874-a water hole, 88-a connecting pipe, 881-a resisting part, 89-a permeate liquid outlet pipe, 810-a concentrated solution outlet pipe, 811-a retaining ring, 812-an air inlet pipe, 813-an aeration disc, 814-a first aeration hole, 815-an aeration pipe, 816-a second aeration hole, 9-an electrocatalytic oxidation tank, 10-a sedimentation tank, 11-a photocatalytic oxidation tank and 12-an aeration biological filter.
Detailed Description
The invention will now be further described with reference to the drawings and the detailed description.
Those not described in detail in this specification are within the skill of the art. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 to 6, the system for the total treatment of landfill leachate provided in this embodiment includes a grid tank 1, an adjusting tank 2, a first anoxic tank 3, a first aerobic tank 4, a second anoxic tank 5, a second aerobic tank 6, an external ultrafiltration membrane module 7, an electrocatalytic oxidation tank 9, a sedimentation tank 10, a photocatalytic oxidation tank 11, and an aeration biological filter 12, which are sequentially connected by a pipeline, membrane modules of the external ultrafiltration membrane module 7 are hollow fiber membrane modules 8, each hollow fiber membrane module 8 includes a housing 81, an end cap 82, an epoxy resin end seal 8483, a plurality of hollow fiber membrane bundles, an epoxy resin coating 85, a raw liquid inlet pipe 86, a raw liquid filter 87, a connecting pipe 88, a permeate outlet pipe 89, and a concentrated liquid outlet pipe 810, the housing 81 is made of stainless steel, and the end cap 82 is hermetically connected to the top of the housing 81 by a thread seal, which is convenient to disassemble. A permeate outlet pipe 89 is fixedly communicated with the side wall of the end cover 82, a baffle ring 811 is formed by inward projection of the upper part of the inner wall of the shell 81, the connecting surface of the epoxy resin end seal 8483 is improved by the baffle ring 811, and the connecting stability of the epoxy resin end seal 8483 is further improved. The inner wall coating of casing 81 has epoxy coating 85, epoxy end seal 8483 sets up in the inside of casing 81, and be located the top that keeps off ring 811, epoxy end seal 8483's lateral wall, and a part of lower lateral wall all is connected with epoxy coating 85, epoxy coating 85's setting not only improves hollow fiber membrane module 8's heat resistance, but also can form more firm connection with epoxy end seal 8483, further improves epoxy end seal 8483's connection stability, improves hollow fiber membrane module 8's life. The upper end of many hollow fiber membrane bundles all is fixed in epoxy end seal 8483, and communicates with end cover 82, and the lower extreme of many hollow fiber membrane bundles all seals the setting, and can freely swing for the pollutant is difficult for piling up on hollow fiber membrane bundles, and the discharge pollutant of being convenient for, the antipollution can the reinforce, and the washing of membrane is regenerated effectually. Casing 81's the fixed intercommunication of left side wall has stoste feed liquor pipe 86, casing 81's the fixed intercommunication of right side wall has 2 concentrate drain pipes 810, stoste feed liquor pipe 86's inside can be dismantled and inlay and be equipped with stoste and filter piece 87, connecting pipe 88 thread sealing connects in the inlet end department of stoste feed liquor pipe 86, and support stoste and filter piece 87, filter the setting of piece 87 through stoste and filter the processing of intaking, avoid the microorganism to adhere to in hollow fiber membrane bundle and cause the jam, and can the deodorization, detach harmful gas, get rid of soluble organic matter. The arrangement of the connecting pipe 88 not only facilitates the connection with an external pipeline, but also plays a role in limiting the primary liquid filter member 87. The invention adopts the processes of pretreatment, external MBR treatment, electrocatalytic oxidation, precipitation, photocatalytic oxidation treatment and aeration biological treatment (BAF) to carry out full treatment on the landfill leachate, and the produced water reaches the standard and is discharged.
Further, the raw liquid filter 87 comprises a placing shell 871, a filter material 872 and a taking and placing column 873, the filter material 872 is arranged in the placing shell 871, a plurality of water holes 874 are formed in the end wall of the placing shell 871, one end of the taking and placing column 873 is positioned in the placing shell 871 and is fixed in the center of the end wall of the placing shell 871, and the other end of the taking and placing column 873 extends out of the placing shell 871. A stepped portion 861 for mounting the dope filter 87 is provided at the liquid inlet end of the dope liquid inlet pipe 86. The inner wall of the connection pipe 88 projects inward with a butting portion 881 for butting against the dope filter 87. Get setting up of putting post 873 and be convenient for get of placing shell 871 and put, when needing to change filter material 872, take off connecting pipe 88, toward extracting out and get post 873, will put the shell 871 and take off from stoste feed liquor pipe 86 through getting post 873, change filter material 872, the filter material 872 finishes the back, will put the shell 871 and fill in stoste feed liquor pipe 86 until contacting with step 861, then lock connecting pipe 88, support portion 881 this moment and just in time with place shell 871 left end contact, will put the shell 871 spacing in stoste feed liquor pipe 86. So that the filter material 872 can be replaced and the replacement speed is fast.
Further, the filter material 872 comprises limestone 8721 and activated carbon 8722, the limestone 8721 and the activated carbon 8722 are sequentially layered and paved along the water inlet direction, and the paving thickness ratio of the limestone 8721 to the activated carbon 8722 is 2: 3. The influent water is treated by limestone 8721 to remove microorganisms in the water, so that the microorganisms are prevented from being attached to the hollow fiber membrane bundle to cause blockage, and then the effluent water is deodorized and harmful gas is removed by the activated carbon 8722, and the activated carbon 8722 can remove soluble organic matters, so that the subsequent treatment is facilitated, and the treatment efficiency is improved.
Further, the hollow fiber membrane module 8 further comprises an air inlet pipe 812 and an aeration disc 813, the air inlet pipe 812 is fixed on the bottom wall of the shell 81, the top end of the air inlet pipe 812 extends to the inside of the shell 81 and is fixed with the aeration disc 813, the aeration disc 813 is located below the hollow fiber membrane bundle, a plurality of first aeration holes 814 are formed in the top wall of the aeration disc 813, and the bottom end of the air inlet pipe 812 is communicated with aeration equipment. The disturbance of aeration to water can effectively improve the swing of the hollow fiber membrane bundle, further reduce the attachment of pollutants to the hollow fiber membrane bundle and prolong the service life.
Further, the top central point of aeration dish 813 puts and is fixed with aeration pipe 815, including aeration pipe 815 is surrounded by a plurality of hollow fiber membrane bundles, make the aeration effect better, aeration pipe 815's top extends to and seals 8483 near epoxy end, the distance between aeration pipe 815 top and the epoxy end seals 8483 diapire in this embodiment is 2cm, a plurality of second aeration holes 816 have been seted up on aeration pipe 815, combine aeration pipe 815's setting through aeration dish 813 combination, realize horizontal and vertical aeration and combine, and the aeration scope is wider, the disturbance effect to water is better.
Further, the plurality of second aeration holes 816 are equidistantly arranged along the circumferential direction of the aeration pipe 815 and are equidistantly arranged along the axial direction of the aeration pipe 815, and the plurality of first aeration holes 814 are radially arranged outside the aeration pipe 815, so that aeration is better and uniform.
The invention also provides a process for the total treatment of landfill leachate, which adopts the system for the total treatment of the landfill leachate as claimed in any one of the above claims to carry out the treatment, and comprises the following steps: s1: pretreatment, send landfill leachate into grid pond 1 in and filter, detach floater, suspended solid, granule, carry out the homogeneity processing in landfill leachate after grid pond 1 filters gets into equalizing basin 2, S2: biochemical reaction handles, and landfill leachate after the homogeneity handles passes through first oxygen deficiency pond 3, first good oxygen pond 4, second oxygen deficiency pond 5 and second good oxygen pond 6 in proper order, carries out multistage denitrification and nitration and handles, carries out nitrogen and phosphorus removal, gets rid of organic matters such as most COD, ammonia nitrogen, S3: and (3) the effluent of the second aerobic tank 6 is pressurized and sent to an external ultrafiltration membrane group device 7 for solid-liquid separation to obtain a permeate and a concentrated solution, and the permeate is discharged and collected, S4: and (5) sending the concentrated solution obtained in the step S3 into an electrocatalytic oxidation tank 9 for further degrading organic matters, S5: and (3) sending the effluent of the electrocatalytic oxidation tank 9 into a sedimentation tank 10 for sedimentation treatment, and S6: sending the supernatant of the sedimentation tank 10 into a photocatalytic oxidation tank 11 for oxidative degradation treatment, further reducing the COD concentration in water, S7: the effluent of the photocatalytic oxidation tank 11 is sent into a biological aerated filter 12 for treatment, SS, COD, BOD, nitrification, denitrification, dephosphorization and AOX (harmful substances) removal are further carried out, and the effluent is discharged after reaching the standard.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art; the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (4)

1. The utility model provides a system for landfill leachate volume is handled which characterized in that:
comprises a grating tank, an adjusting tank, a first anoxic tank, a first aerobic tank, a second anoxic tank, a second aerobic tank, an external ultrafiltration membrane group device, an electrocatalytic oxidation tank, a sedimentation tank, a photocatalytic oxidation tank and an aeration biological filter tank which are sequentially connected through pipelines;
the membrane component of the external ultrafiltration membrane component is a hollow fiber membrane component;
the hollow fiber membrane component comprises a shell, an end cover, an epoxy resin end seal, a plurality of hollow fiber membrane bundles, an epoxy resin coating, a stock solution inlet pipe, a stock solution filtering piece, a connecting pipe, a permeate liquid outlet pipe and a concentrated liquid outlet pipe;
the end cover is in threaded sealing connection with the top of the shell, and a permeate liquid outlet pipe is fixedly communicated with the side wall of the end cover;
the upper part of the inner wall of the shell protrudes inwards to form a baffle ring, the inner wall of the shell is coated with an epoxy resin coating, the epoxy resin end seal is arranged inside the shell and is positioned above the baffle ring, and the outer side wall and part of the lower side wall of the epoxy resin end seal are connected with the epoxy resin coating;
the upper ends of the hollow fiber membrane bundles are fixed to the epoxy resin end seals and communicated with the end covers, and the lower ends of the hollow fiber membrane bundles are sealed and can freely swing;
a stock solution inlet pipe is fixedly communicated with one side wall of the shell, and a concentrated solution outlet pipe is fixedly communicated with the other side wall of the shell;
a stock solution filtering piece is detachably embedded in the stock solution inlet pipe, and the connecting pipe is in threaded sealing connection with the liquid inlet end of the stock solution inlet pipe and abuts against the stock solution filtering piece;
the stock solution filter element comprises a placing shell, a filter material and a taking and placing column;
the placing shell is internally provided with a filter material;
a plurality of water holes are formed in the end wall of the placing shell;
one end of the taking and placing column is positioned in the placing shell and fixed in the center of the end wall of the placing shell, and the other end of the taking and placing column extends out of the placing shell;
the filter material comprises limestone and activated carbon, and the limestone and the activated carbon are sequentially laid layer by layer along the water inlet direction;
the laying thickness ratio of the limestone to the activated carbon is 2: 3;
the hollow fiber membrane component also comprises an air inlet pipe and an aeration disc;
the air inlet pipe is fixed on the bottom wall of the shell, one end of the air inlet pipe extends into the shell and is fixedly provided with an aeration disc, the aeration disc is positioned below the hollow fiber membrane bundle, the top wall of the aeration disc is provided with a plurality of first aeration holes, and the other end of the air inlet pipe is communicated with aeration equipment;
an aeration pipe is fixed at the center of the top of the aeration disc, the aeration pipe is surrounded by a plurality of hollow fiber membrane bundles, the top end of the aeration pipe extends to a position close to the epoxy resin end seal, and a plurality of second aeration holes are formed in the aeration pipe;
the plurality of second aeration holes are arranged along the circumferential direction of the aeration pipe at equal intervals and are arranged along the axial direction of the aeration pipe at equal intervals;
the plurality of first aeration holes are arranged outside the aeration pipe in a radiation mode.
2. The system for landfill leachate total volume treatment according to claim 1, wherein:
the feed liquor department of stoste feed liquor pipe is equipped with and is used for the installation the step portion of stoste filtration piece.
3. The system for landfill leachate total volume treatment according to claim 1, wherein:
the inner wall of the connecting pipe is inwards protruded with a propping part used for propping against the stock solution filtering piece.
4. A process for the full treatment of landfill leachate is characterized in that:
the system for the full treatment of landfill leachate according to any one of claims 1 to 3 is used for the treatment, comprising the following steps:
s1: pre-treatment, namely feeding the landfill leachate into a grid pond for filtering, and feeding the landfill leachate filtered by the grid pond into an adjusting pond for homogenizing treatment;
s2: performing biochemical reaction treatment, wherein the garbage leachate after the homogenization treatment sequentially passes through a first anoxic tank, a first aerobic tank, a second anoxic tank and a second aerobic tank to perform multistage denitrification and nitrification treatment;
s3: the effluent of the second aerobic tank is pressurized and sent to an external ultrafiltration membrane group device for solid-liquid separation to obtain permeate and concentrated solution, and the permeate is discharged and collected;
s4: sending the concentrated solution obtained in the step S3 into an electrocatalytic oxidation tank to further degrade organic matters;
s5: sending the effluent of the electrocatalytic oxidation tank into a sedimentation tank for sedimentation treatment;
s6: sending the supernatant of the sedimentation tank into a photocatalytic oxidation tank for oxidative degradation treatment to reduce the COD concentration in the water;
s7: and (3) delivering the effluent of the photocatalytic oxidation tank into a biological aerated filter for treatment, and discharging the effluent up to the standard.
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