CN112266134B - Full-scale treatment system and process for landfill leachate - Google Patents
Full-scale treatment system and process for landfill leachate Download PDFInfo
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- CN112266134B CN112266134B CN202011161838.0A CN202011161838A CN112266134B CN 112266134 B CN112266134 B CN 112266134B CN 202011161838 A CN202011161838 A CN 202011161838A CN 112266134 B CN112266134 B CN 112266134B
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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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2826—Anaerobic digestion processes using anaerobic filters
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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
- C02F7/00—Aeration of stretches of water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a garbage leachate total treatment system and a process, which belong to the technical field of water treatment, and the garbage leachate total treatment system comprises a grid tank, an adjusting tank, a first anoxic tank, a first aerobic tank, a second anoxic tank, a second aerobic tank and an external ultrafiltration membrane set which are sequentially connected through a pipeline, wherein the external ultrafiltration membrane set is connected with a DTNF nanofiltration system, a permeate outlet of the DTNF nanofiltration system is connected with a first DTRO reverse osmosis system, a concentrate outlet of the first DTRO reverse osmosis system is connected with an MVR evaporator, a concentrate outlet of the DTNF nanofiltration system is connected with a second DTRO reverse osmosis system, a concentrate outlet of the second DTRO reverse osmosis system is connected with the STRO reverse osmosis system, and a concentrate outlet of the STRO reverse osmosis system is connected with the TVR evaporator. The full-scale treatment system and process for the landfill leachate have high treatment efficiency and long service life of the membrane module.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a full-scale treatment system and process for landfill leachate.
Background
The landfill leachate is high-concentration organic wastewater which is derived from water contained in garbage in a garbage landfill, rain, snow and other water entering the landfill, deducts the saturated water holding capacity of the garbage and a soil covering layer and is formed by 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 full-scale treatment system and a full-scale treatment process for 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 garbage leachate total treatment system which comprises a grid tank, an adjusting tank, a first anoxic tank, a first aerobic tank, a second anoxic tank, a second aerobic tank and an external ultrafiltration membrane group device which are sequentially connected through pipelines, wherein a concentrated solution outlet of the external ultrafiltration membrane group device is connected with the input end of a DTNF nanofiltration system through a pipeline, a permeate outlet of the DTNF nanofiltration system is connected with the input end of a first DTRO reverse osmosis system through a pipeline, a concentrated solution outlet of the first DTRO reverse osmosis system is connected with the input end of an MVR evaporator through a pipeline, a concentrated solution outlet of the DTNF nanofiltration system is connected with the input end of a second DTRO reverse osmosis system through a pipeline, a concentrated solution outlet of the second DTRO reverse osmosis system is connected with the input end of the STRO reverse osmosis system through a pipeline, and a concentrated solution outlet of the STRO reverse osmosis system is connected with the TVR evaporator through a pipeline, 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 filter part, a connecting pipe, a permeate liquid outlet pipe and a concentrated solution outlet pipe, the end cover is connected to the top of the shell in a threaded sealing manner, the 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 the epoxy resin coating, the epoxy resin end seal is arranged in the shell and is positioned above the baffle ring, the outer side wall of the epoxy resin end seal and part of the lower side wall are both connected with the epoxy resin coating, the upper ends of the hollow fiber membrane bundles are both fixed on the epoxy resin end seal and are communicated with the end cover, the lower ends of the hollow fiber membrane bundles are both sealed and can freely swing, the fixed intercommunication of a lateral wall of casing has stoste feed liquor pipe, and the fixed intercommunication of another lateral wall of casing has the concentrate drain pipe, and the inside of stoste feed liquor pipe can be dismantled to inlay and be equipped with stoste and filter the piece, and connecting pipe thread seal connects in the feed liquor department of stoste feed liquor pipe, and supports stoste and filter the 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 liquid inlet end of the stock solution liquid inlet pipe is provided with a step part for installing the stock solution filter element.
Preferably, the inner wall of the connecting pipe protrudes inwards to form 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 by 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 garbage leachate full treatment process, which adopts the garbage leachate full treatment system to carry out 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 permeate and concentrated solution, and the permeate is discharged and collected, S4: and (2) sending the concentrated solution obtained in the step (S3) into a DTNF nanofiltration system, sending the permeate obtained by the DTNF nanofiltration system into a first DTRO reverse osmosis system, sending the concentrated solution obtained by the DTNF nanofiltration system into a second DTRO reverse osmosis system, discharging and collecting the permeate obtained by the first DTRO reverse osmosis system and the permeate obtained by the second DTRO reverse osmosis system, sending the concentrated solution obtained by the first DTRO reverse osmosis system into an MVR evaporator for treatment, discharging and collecting the obtained condensed water, sending the concentrated solution obtained by the second DTRO reverse osmosis system into the STRO reverse osmosis system, discharging and collecting the obtained permeate, sending the obtained concentrated solution into the TVR evaporator for treatment, and discharging and collecting the obtained condensed liquid.
The invention has the beneficial effects that:
1. the concentrated solution obtained by the external ultrafiltration membrane module is treated by adopting a DTNF (draw texturing yarn) process, the permeate generated by the DTNF process is subjected to advanced treatment through a DTRO + MVRD process, the concentrated solution generated by the DTNF process is subjected to advanced treatment through a DTRO + STRO + TVR process, 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 service life of the hollow fiber membrane module is long.
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. The setting through stoste filtration piece is to intaking filtration treatment, avoids microorganism to adhere to in hollow fiber membrane bundle and causes 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 external 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 set up along aeration pipe circumference equidistance interval, and set up 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 a landfill leachate total treatment system 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 stock solution inlet pipe, the stock solution filter 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 grating pool, 2-a regulating 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 stepped part, 87-a stock solution filter piece, 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 liquid outlet pipe, 811-a retaining ring, 812-an air inlet pipe, 813-an aeration disc, 814-first aeration hole, 815-aeration pipe, 816-second aeration hole, 9-DTNF nanofiltration system, 10-first DTRO reverse osmosis system, 11-MVR evaporator, 12-second DTRO reverse osmosis system, 13-STRO reverse osmosis system and 14-TVR evaporator.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and 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 fig. 6, the system for treating the total amount 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, and an external ultrafiltration membrane module 7, which are sequentially connected by pipes, wherein a concentrated solution outlet of the external ultrafiltration membrane module is connected to an input end of a DTNF nanofiltration system 9 by a pipe, a permeate outlet of the DTNF nanofiltration system is connected to an input end of a first DTRO reverse osmosis system 10 by a pipe, a concentrated solution outlet of the first DTRO reverse osmosis system is connected to an input end of an MVR evaporator 11 by a pipe, a concentrated solution outlet of the DTNF nanofiltration system is connected to an input end of a second DTRO reverse osmosis system 12 by a pipe, a concentrated solution outlet of the second DTRO reverse osmosis system is connected to an input end of a strro system 13 by a pipe, a concentrated solution outlet of the STRO reverse osmosis system is connected to a TVR evaporator 14 by a pipe, the membrane component of the external ultrafiltration membrane component 7 is a hollow fiber membrane component 8, the hollow fiber membrane component 8 comprises a shell 81, an end cover 82, an epoxy resin end seal 8483, a plurality of hollow fiber membrane bundles, an epoxy resin coating 85, a stock solution inlet pipe 86, a stock solution filter piece 87, a connecting pipe 88, a permeate liquid outlet pipe 89 and a concentrated solution outlet pipe 810, the shell 81 is made of stainless steel, and the end cover 82 is in threaded sealing connection with the top of the shell 81, so that the disassembly is convenient. 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 of the shell 81 is coated with an epoxy resin coating 85, the epoxy resin end seal 8483 is arranged inside the shell 81 and located above the baffle ring 811, the outer side wall of the epoxy resin end seal 8483 and a part of the lower side wall are connected with the epoxy resin coating 85, the arrangement of the epoxy resin coating 85 not only improves the heat resistance of the hollow fiber membrane module 8, but also can form more stable connection with the epoxy resin end seal 8483, the connection stability of the epoxy resin end seal 8483 is further improved, and the service life of the hollow fiber membrane module 8 is prolonged. 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, DTNF nanofiltration treatment, DTRO + MVRD and DTRO + STRO + TVR to carry out full treatment on the landfill leachate, and the produced water reaches the discharge standard.
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. An abutting portion 881 for abutting against the dope filter 87 is projected inwardly from the inner wall of the connection pipe 88. 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 microorganisms in the water are removed through the limestone 8721 in the water inlet process, the microorganisms are prevented from being attached to the hollow fiber membrane bundle to cause blockage, then the activated carbon 8722 is used for deodorization and harmful gas removal, 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 garbage leachate full treatment process, which adopts the garbage leachate full treatment system as in any one of the above claims to carry out treatment and comprises the following steps: s1: pretreatment, sending the landfill leachate into a grid pond 1 for filtering, removing floating objects, suspended matters and particles, and enabling the landfill leachate filtered by the grid pond 1 to enter an adjusting tank 2 for homogenization treatment, 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 (2) sending the concentrated solution obtained in the step (S3) into a DTNF nanofiltration system 9, sending the permeate obtained by the DTNF nanofiltration system into a first DTRO reverse osmosis system 10, sending the concentrated solution obtained by the DTNF nanofiltration system into a second DTRO reverse osmosis system 12, discharging and collecting the permeate obtained by the first DTRO reverse osmosis system 10 and the permeate obtained by the second DTRO reverse osmosis system 12, sending the concentrated solution obtained by the first DTRO reverse osmosis system 10 into an MVR evaporator 11 for treatment, discharging and collecting the obtained condensed water, sending the concentrated solution obtained by the second DTRO reverse osmosis system 12 into an STRO reverse osmosis system 13, discharging and collecting the obtained permeate, sending the obtained concentrated solution into a TVR evaporator 14 for treatment, and discharging and collecting the obtained condensed liquid.
The above examples are only intended to illustrate the technical solution of the present invention, and 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 skilled 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 (5)
1. The utility model provides a landfill leachate gross processing system 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 and an external ultrafiltration membrane group device which are sequentially connected through pipelines;
the system comprises an external ultrafiltration membrane group device, a DTNF (deep draw negative ion) nanofiltration system, a first DTRO (reverse osmosis) system, an MVR (mechanical vapor recompression) evaporator, a DTNF (transient voltage negative ion) evaporator, a second DTRO reverse osmosis system, a TVR evaporator and a TVR evaporator, wherein a concentrated solution outlet of the external ultrafiltration membrane group device is connected with an input end of the DTNF nanofiltration system through a pipeline;
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 solution 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 active 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 the 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.
2. The landfill leachate total treatment system of claim 1, wherein:
the feed liquor end department of stoste feed liquor pipe is equipped with the step portion that is used for installing stoste filters.
3. The landfill leachate total treatment system of 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. The landfill leachate total treatment system of claim 1, wherein:
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 first aeration holes are arranged outside the aeration pipe in a radial mode.
5. The full-scale treatment process of the landfill leachate is characterized by comprising the following steps of:
the full-scale treatment system for the landfill leachate according to any one of claims 1 to 4 is adopted for treatment, and comprises 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: and (2) sending the concentrated solution obtained in the step (S3) into a DTNF nanofiltration system, sending the permeate obtained by the DTNF nanofiltration system into a first DTRO reverse osmosis system, sending the concentrated solution obtained by the DTNF nanofiltration system into a second DTRO reverse osmosis system, discharging and collecting the permeate obtained by the first DTRO reverse osmosis system and the permeate obtained by the second DTRO reverse osmosis system, sending the concentrated solution obtained by the first DTRO reverse osmosis system into an MVR evaporator for treatment, discharging and collecting the obtained condensed water, sending the concentrated solution obtained by the second DTRO reverse osmosis system into the STRO reverse osmosis system, discharging and collecting the obtained permeate, sending the obtained concentrated solution into the TVR evaporator for treatment, and discharging and collecting the obtained condensed liquid.
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