CN217838659U

CN217838659U - Landfill leachate's processing system

Info

Publication number: CN217838659U
Application number: CN202222072799.8U
Authority: CN
Inventors: 李诗恬; 杨露
Original assignee: Shanghai Heyuan Environmental Protection Group Co ltd
Current assignee: Shanghai Heyuan Environmental Protection Group Co ltd
Priority date: 2022-08-08
Filing date: 2022-08-08
Publication date: 2022-11-18
Anticipated expiration: 2032-08-08

Abstract

The utility model provides a landfill leachate's processing system, including pretreatment unit, biochemical treatment unit, advanced treatment unit and sludge treatment unit: the pretreatment unit comprises an adjusting tank and a coagulating sedimentation tank, the biochemical treatment unit comprises an A/O biochemical tank module and an MBR reaction tank, the advanced treatment unit comprises a nanofiltration device and a reverse osmosis device, the sludge treatment unit comprises a sludge concentration tank, and the adjusting tank, the coagulating sedimentation tank, the A/O biochemical tank module, the MBR reaction tank, the nanofiltration device and the reverse osmosis device are communicated in sequence; and the coagulating sedimentation tank and the A/O biochemical tank module are communicated with the sludge concentration tank.

Description

Landfill leachate's processing system

Technical Field

The utility model belongs to the technical field of sewage treatment, especially, relate to a landfill leachate's processing system.

Background

Along with the development of the times, the nation pays considerable attention to garbage treatment, and a large amount of funds are invested to treat garbage, so that the environment is protected. The garbage disposal methods include incineration, composting, landfill and the like. The landfill leachate is liquid generated by treating garbage, is high-concentration organic wastewater with complex components, contains a large amount of organic matters, suspended matters, ammonia nitrogen and heavy metal particles, can cause serious environmental pollution to surrounding underground water and surface water, and seriously threatens the health of people. Therefore, there is a need for landfill leachate plants that reduce the impact of harmful substances on the surrounding environment.

The landfill leachate contains more organic matters (such as various aromatic compounds and humus) which are difficult to degrade and difficult to treat and inorganic matters (such as ammonium, carbonate, sulfate and the like), and the landfill leachate is complex in components and most typically characterized in that the content of pollutants is extremely high, and the fluctuation of water quality and water quantity is large, so that the landfill leachate is very difficult to treat, and if the landfill leachate is not treated properly, the landfill leachate causes great harm. The traditional activated sludge method cannot effectively remove COD in the leachate, and an advanced treatment process must be added.

The main difficulties of landfill leachate treatment are as follows: 1. has high organic content and contains a large amount of toxic and macromolecular organic matters. The standard discharge cannot be realized by adopting a single physicochemical or biochemical process; 2. the waveform of the water quality and the water quantity greatly increases the difficulty of stable standard discharge.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a landfill leachate's processing system adopts SS, COD, BOD etc. that "preliminary treatment + biochemical treatment + advanced treatment + sludge treatment" combined process adopted the biochemical effectual processing aquatic of compound mode of materialization to unite earlier, and the waste water stable treatment after handling when adopting to receive and strain + reverse osmosis is to up to standard, and this combined process has characteristics such as handle high efficiency stability, operation management convenience, treatment effect are good to landfill leachate.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

the system for treating the landfill leachate comprises a pretreatment unit, a biochemical treatment unit, an advanced treatment unit and a sludge treatment unit: the pretreatment unit comprises an adjusting tank and a coagulating sedimentation tank, the biochemical treatment unit comprises an A/O biochemical tank module and an MBR reaction tank, the advanced treatment unit comprises a nanofiltration device and a reverse osmosis device, the sludge treatment unit comprises a sludge concentration tank, and the adjusting tank, the coagulating sedimentation tank, the A/O biochemical tank module, the MBR reaction tank, the nanofiltration device and the reverse osmosis device are communicated in sequence; and the coagulating sedimentation tank and the A/O biochemical tank module are communicated with the sludge concentration tank.

Preferably, the A/O biochemical pool module comprises a plurality of stages of A/O biochemical pools which are communicated in sequence, and the A/O biochemical pools are communicated with the sludge concentration pool.

Preferably, the MBR reaction tank is also communicated with the last stage A/O biochemical tank through a reflux device.

Preferably, the A/O biochemical pool comprises a denitrification area and a nitrification area which are communicated, the denitrification area is provided with a first ORP monitoring instrument, the bottom of the nitrification area is provided with an aeration device, a partition plate is arranged between the nitrification area and the denitrification area, and combined fillers are arranged in the nitrification area and the denitrification area.

Preferably, the coagulation sedimentation tank comprises a flocculation zone, a coagulation zone and a sedimentation zone which are communicated in sequence, the flocculation zone and the coagulation zone are respectively provided with a dosing device and a stirring device, the sedimentation zone is provided with an inclined plate sedimentation device, and the sedimentation zone is communicated with the sludge concentration tank.

Preferably, an MBR membrane module is arranged in the MBR reaction tank.

Preferably, a second ORP monitor meter and a first conductivity analyzer are arranged in the nanofiltration device.

Preferably, a second conductivity analyzer is arranged in the reverse osmosis device.

Preferably, the nanofiltration device and the reverse osmosis device are communicated to a landfill.

Preferably, the sludge concentration tank is communicated with a landfill.

Compared with the prior art, the utility model discloses there are following technological effect:

1. considering that the landfill leachate has more water inlet impurities, the coagulating sedimentation tank can be used for reducing the turbidity, the chromaticity and the like of raw water, removing various harmful pollutants and providing biodegradability for a back-end biochemical treatment system;

2. in consideration of the water quality characteristics of the landfill leachate, in order to further remove ammonia nitrogen and COD, an A/O biochemical tank is used for denitrification, and an MBR reaction tank is used for obtaining better biochemical effluent;

3. the method considers that the water quality of the inlet water entering the nanofiltration and reverse osmosis system after the front-end treatment is slightly influenced, and the method is particularly used for the advanced treatment of the percolate, and can effectively ensure that the water quality of the outlet water reaches the standard.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages simultaneously.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts. In the drawings:

fig. 1 is a schematic structural diagram of a system for treating landfill leachate according to a preferred embodiment of the present invention;

fig. 2 is a schematic structural diagram of a coagulating sedimentation tank provided in a preferred embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a first stage A/O biochemical pool according to a preferred embodiment of the present invention;

fig. 4 is a schematic structural diagram of the second stage a/O biochemical tank and the MBR reaction tank according to the preferred embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to specific embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention. All of which belong to the protection scope of the present invention.

Referring to fig. 1 to 4, a system for treating landfill leachate includes a pretreatment unit 1, a biochemical treatment unit 2, a deep treatment unit 3, and a sludge treatment unit: the pretreatment unit 1 comprises an adjusting tank 11 and a coagulating sedimentation tank 12, the biochemical treatment unit 2 comprises an A/O biochemical tank module and an MBR reaction tank 23, the advanced treatment unit 3 comprises a nanofiltration device 31 and a reverse osmosis device 32, the sludge treatment unit comprises a sludge concentration tank 4, and the adjusting tank 11, the coagulating sedimentation tank 12, the A/O biochemical tank module, the MBR reaction tank 23, the nanofiltration device 31 and the reverse osmosis device 32 are communicated in sequence according to the sewage treatment direction; the coagulating sedimentation tank 12 and the A/O biochemical tank module are communicated with the sludge concentration tank 4, and the sludge concentration tank 4, the nano-filtration device 31 and the reverse osmosis device 32 are communicated to a landfill site.

In this embodiment, referring to fig. 2, the coagulation sedimentation tank 12 includes a flocculation area 121, a coagulation area 122 and a sedimentation area 123 which are sequentially communicated, the flocculation area 121 and the coagulation area 122 have the same internal structure, and are both provided with a chemical adding device and a stirring device, the sedimentation area 123 is provided with an inclined plate sedimentation device, and the sedimentation area 123 is communicated with the sludge concentration tank 4. When the device works, the oxidizing agent and the coagulant are added into the percolate through the dosing device, so that pollutants such as colloid components, organic matters, hardness, carbonate, heavy metals and the like in the percolate can be effectively removed, then the percolate enters the inclined plate sedimentation device for mud-water separation treatment, and the generated sediment enters the sludge concentration tank 4.

The sludge concentration tank 4 is used for receiving sludge generated by the operation of the coagulation sedimentation tank 12 and the A/O biochemical tank module and recharging the treated sludge to a landfill.

The utility model discloses it is right the biochemical pond module of AO specifically includes that the biochemical pond of several grades of AO does not do the restriction, in this embodiment, biochemical pond module of AO includes the biochemical pond 21 of first order AO and the biochemical pond 22 of second level AO that are linked together in order according to the sewage treatment direction, biochemical pond 21 of first order AO and the biochemical pond 22 of second level AO all with sludge concentration tank 4 is linked together, and MBR reaction tank 23 still communicates through reflux unit and the biochemical pond 22 of second level AO.

In this embodiment, the first stage a/O biochemical pool 21 and the second stage a/O biochemical pool 22 both include a denitrification area and a nitrification area communicated with each other, the denitrification area is provided with a first ORP monitoring instrument, and ORP can indicate denitrification processing capability, and when ORP is low, it indicates that denitrification capability is strong, and real-time monitoring and management are convenient, and an aeration device is provided at the bottom of the nitrification area. The denitrification area and the nitrification area are connected in series, a partition plate is arranged between the nitrification area and the denitrification area, the sewage flows to the nitrification area automatically after denitrification treatment, and BOD and phosphorus are removed by full aeration in the nitrification area. The nitrification region and the denitrification region are internally provided with combined fillers, the combined fillers are plastic rings serving as frameworks, the combined fillers are loaded with vinylon wires, the vinylon wires are fastened on the plastic rings, and the tows are uniformly distributed in the sewage. The function of the combined filler is as follows: the membrane can be hung, bubbles can be effectively cut, the transfer rate and the utilization rate of oxygen are improved, the water-gas biomembrane is fully exchanged, and organic matters in water are efficiently treated.

Referring to fig. 3, when the first stage a/O biochemical tank 21 is in operation, the wastewater is denitrified in the denitrification tank 211 of the first stage a/O biochemical tank 21, and denitrified in the nitrification tank 212 of the first stage a/O biochemical tank 21. The mixed liquid in the nitrification area 212 of the first-stage A/O biochemical tank 21 flows back to the denitrification area 211 of the first-stage A/O biochemical tank 21 to carry out denitrification and denitrogenation.

Referring to fig. 4, when the second stage a/O biochemical tank 22 is in operation, the wastewater is denitrified in the denitrification tank 221 of the second stage a/O biochemical tank 22, and denitrified in the nitrification tank 222 of the second stage a/O biochemical tank 22. The second stage a/O biochemical tank 22 is combined with the MBR reaction tank 23, and the sludge mixed liquid in the MBR reaction tank 23 is filtered by the nanofiltration device 31 to obtain effluent.

The MBR membrane module 231 is arranged in the MBR reaction tank 23, because denitrifying bacteria are easy to expand and run off, the nitrifying area 222 of the second-stage A/O biochemical tank 22 is supposed to adopt the MBR membrane to enrich the concentration of the denitrifying bacteria, so that the denitrifying efficiency is improved, and the water quality treatment effect is improved.

Nanofiltration is a membrane separation technology between ultrafiltration and reverse osmosis, nanoscale substances are intercepted through screening and separation, and pollutants (chemical oxygen demand (COD) refers to the amount of oxygen consumed when substances capable of being oxidized in a water body are subjected to chemical oxidation, namely chemical oxygen demand), BOD (BOD is a comprehensive index representing the content of aerobic pollutants such as organic matters in water, namely biochemical oxygen demand), SS (SS refers to suspended matters in water) and the like (chemical oxygen demand (COD), biochemical Oxygen Demand (BOD) and suspended matters (SS) all represent important indexes of water pollution degree, the higher the numerical value, the higher the concentration of the pollutants in the water body, the more serious the water body pollution) are removed, so that the water quality of effluent is effectively improved, and the produced concentrated water is recycled to a landfill. A second ORP monitor meter and a first conductivity analyzer are arranged in the nanofiltration device 31.

The reverse osmosis device 32 is a DTRO disc tube type device which is strong in stability, simple to maintain and low in energy consumption, and a DTRO membrane component effectively avoids scaling of a membrane, so that membrane pollution is reduced, and the service life of the reverse osmosis membrane is prolonged. A second conductivity analyzer is disposed within the reverse osmosis unit 32.

The utility model discloses a theory of operation does:

the garbage leachate is collected and converged into a regulating tank 11, the leachate in the regulating tank 11 is lifted to a coagulating sedimentation tank 12 through a pump, a medicament is added into the coagulating sedimentation tank 12 to enable sludge to be settled and remove part of pollutants, then the sludge enters a first-stage A/O biochemical tank 21, the first-stage A/O biochemical tank 21 is divided into two stages of denitrification and nitrification, sewage is subjected to denitrification in a denitrification region 211, nitrogen is removed in a nitrification region 212, and a mixed solution in the nitrification region 212 flows back to the denitrification region 211 to be subjected to denitrification and nitrogen removal. In this embodiment, the first stage A/O biochemical pool 21 and the second stage A/O biochemical pool 22 are two identical A/O biochemical pools connected in series, and the second stage A/O biochemical pool 22 and the MBR reaction pool 23 have an internal circulation pipe for water outlet, which can improve the biochemical reaction efficiency. The sludge mixed liquid in the second-stage A/O biochemical pool 22 is filtered by an MBR membrane to obtain effluent. The sewage is further denitrified and dephosphorized in the second-stage A/O biochemical pool 22 (in the anaerobic pool, phosphorus-accumulating bacteria release phosphorus and absorb organic matters which are easy to degrade, such as low-grade fatty acid, and in the aerobic pool, the phosphorus-accumulating bacteria excessively absorb phosphorus and remove the phosphorus through the discharge of residual sludge), so that the removal rate of pollutants is effectively improved, and a certain protection effect is achieved on the membrane. Due to the efficient interception of the membrane, a high sludge concentration can be maintained in the second stage a/O biochemical tank 22. The indexes of the ammonia nitrogen of the effluent of the MBR reaction tank 23 (the MBR reaction tank 23 has the effect of removing the ammonia nitrogen) are basically up to the standard, but part of the organic matters which are difficult to degrade cannot be removed, and in order to ensure that the water quality meets the water quality requirement of the discharge standard, the effluent of the MBR reaction tank 23 needs to enter the nanofiltration device 31 for further advanced treatment. Nanofiltration is a membrane separation technology between ultrafiltration and reverse osmosis, and is used for intercepting nanoscale (0.001 micron) substances through sieving and separation, removing pollutants such as COD, BOD, SS and the like in water, effectively improving the quality of effluent water, and recharging the produced concentrated water to a landfill. The water discharged from the nanofiltration device 31 enters the existing reverse osmosis device 32, and organic matters which cannot be biochemically treated are removed by the existing reverse osmosis device 32, so that indexes of COD, BOD, NH3-N, SS, heavy metals, coliform group, chromaticity and the like of the discharged water are further reduced, and the discharged water reaches the discharge standard after the standard is improved. The excess sludge generated by the coagulating sedimentation tank 12 and the biochemical system enters the sludge concentration tank 4 and is directly refilled with the filtrate to the landfill site.

The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. The system for treating the landfill leachate is characterized by comprising a pretreatment unit, a biochemical treatment unit, a deep treatment unit and a sludge treatment unit: the pretreatment unit comprises an adjusting tank and a coagulating sedimentation tank, the biochemical treatment unit comprises an A/O biochemical tank module and an MBR reaction tank, the advanced treatment unit comprises a nanofiltration device and a reverse osmosis device, the sludge treatment unit comprises a sludge concentration tank, and the adjusting tank, the coagulating sedimentation tank, the A/O biochemical tank module, the MBR reaction tank, the nanofiltration device and the reverse osmosis device are communicated in sequence; and the coagulating sedimentation tank and the A/O biochemical tank module are communicated with the sludge concentration tank.

2. The landfill leachate treatment system of claim 1, wherein the A/O biochemical tank module comprises a plurality of stages of A/O biochemical tanks in serial communication, and the A/O biochemical tanks are in communication with the sludge concentration tank.

3. The system for treating landfill leachate according to claim 2, wherein the MBR reaction tank is further communicated with the last stage A/O biochemical tank through a reflux device.

4. The landfill leachate treatment system according to claim 2, wherein the A/O biochemical tank comprises a denitrification zone and a nitrification zone which are communicated with each other, the denitrification zone is provided with the first ORP monitoring instrument, the bottom of the nitrification zone is provided with the aeration device, a partition plate is arranged between the nitrification zone and the denitrification zone, and combined packing is arranged in the nitrification zone and the denitrification zone.

5. The system for treating landfill leachate according to claim 1, wherein the coagulation sedimentation tank comprises a flocculation zone, a coagulation zone and a sedimentation zone which are sequentially communicated, the flocculation zone and the coagulation zone are respectively provided with a dosing device and a stirring device, the sedimentation zone is provided with an inclined plate sedimentation device, and the sedimentation zone is communicated with the sludge concentration tank.

6. The landfill leachate treatment system of claim 1, wherein an MBR membrane module is arranged in the MBR reaction tank.

7. The landfill leachate treatment system according to claim 1, wherein a second ORP monitor meter and a first conductivity analyzer are disposed in the nanofiltration device.

8. The landfill leachate treatment system of claim 1, wherein a second conductivity analyzer is disposed in the reverse osmosis unit.

9. The landfill leachate treatment system of claim 1, wherein the nanofiltration device and the reverse osmosis device are both connected to a landfill.

10. The landfill leachate treatment system of claim 1, wherein the sludge concentration tank is in communication with a landfill.