CN211521873U - Treatment system for underground water polluted by landfill leachate - Google Patents
Treatment system for underground water polluted by landfill leachate Download PDFInfo
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- CN211521873U CN211521873U CN201922362707.8U CN201922362707U CN211521873U CN 211521873 U CN211521873 U CN 211521873U CN 201922362707 U CN201922362707 U CN 201922362707U CN 211521873 U CN211521873 U CN 211521873U
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Abstract
The utility model discloses a treatment system for underground water polluted by landfill leachate, which comprises a stock solution storage tank, an inclined tube sedimentation tank and a sand filtration tank which are connected in sequence through pipelines, the device comprises a pretreatment water production tank, a low-pressure RO membrane unit and a concentrated solution storage tank, wherein a pretreatment lifting pump for pumping polluted water in the raw liquid storage tank into the inclined tube sedimentation tank and a medicament feeding device for feeding PAC (poly aluminum chloride) medicaments and PAM (polyacrylamide) medicaments into the inclined tube sedimentation tank are arranged between the inclined tube sedimentation tanks, a sludge discharge device is connected with the sand filter tank, a filter is arranged between the sand filter tank and the pretreatment water production tank, a membrane unit water inlet pump for pumping the polluted water in the pretreatment water production tank into the low-pressure RO membrane unit and an acid scale inhibitor feeding device for feeding acid and scale inhibitors into the low-pressure RO membrane unit are arranged between the pretreatment water production tank and the low-pressure RO membrane unit, the concentrated solution storage tank is connected with a concentrated solution discharge pipe, and the low-pressure RO membrane unit is connected with. The utility model has the advantages of economy, reasonability, rapidness and effectiveness.
Description
Technical Field
The utility model relates to a landfill leachate contaminated water processing system especially relates to a receive landfill leachate to pollute processing system of groundwater.
Background
The landfill leachate refers to sewage filtered out by fermentation, showering and washing of rainwater, and soaking of surface water and underground water during the stacking and landfill processes of the garbage. Landfill leachate is high-concentration organic wastewater, and due to high concentration, slow flow and long leakage duration, serious pollution is caused to surrounding underground water and surface water. The landfill is the main mode of domestic waste treatment, but at present most landfill sites can not meet the requirement of strictly preventing the regeneration pollution, the pollution severity of landfill leachate to underground water and surface water gradually appears along with the increase of the service life of the landfill sites, and if the polluted water is not collected and treated, the polluted water is discharged, and huge environmental pollution is caused.
Underground water polluted by landfill leachate mainly contains pollution sources such as SS, COD, ammonia nitrogen, total nitrogen and the like, the content of the pollution sources is far beyond the discharge standard of GB16889-2008, and the indexes of the water quality of the polluted water are shown in the first table:
water quality index of surface-polluted water
The treatment of groundwater polluted by landfill leachate mainly has two ways, one is to effectively control the pollution source, prevent the leakage of landfill leachate, fundamentally solve the problem that the groundwater is polluted, and the other is to restore the original design almost impossible once the measures such as the seepage prevention of the landfill site are gradually lost, only follow-up remedial measures can be taken for rescue, and the treatment is mainly to collect and treat the polluted water source and then discharge the polluted water source after reaching the standard. Various treatment methods are available for treating the sewage, and mainly comprise an SBR (sequencing batch reactor) sequence intermittent activated sludge treatment method, an MBR (membrane bioreactor) treatment method, a DTRO disc tube type reverse osmosis membrane treatment method and the like, but the treatment methods have the defects of complex treatment process, long construction period, overhigh treatment cost and the like. The project of leachate treatment can be matched and constructed in the engineering construction of the landfill site, the current mainstream leachate treatment process generally adopts the process of MBR + membrane deepening treatment, the design treatment capacity of the leachate treatment project can be designed according to the landfill quantity during the project construction and can give a certain margin, along with the occurrence of the condition that the landfill site pollutes the underground water, the originally designed leachate treatment capacity can not meet the requirements of the production quantity of the landfill leachate and the quantity of the underground water polluted by the landfill leachate, so a set of treatment device and process for specially treating the underground water polluted by the landfill leachate is required.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome the not enough of prior art, provide a processing system of all sorts of more economical, reasonable, quick effectual groundwater contaminated by landfill leachate.
In order to solve the technical problem, the utility model discloses a following technical scheme:
a treatment system for underground water polluted by landfill leachate comprises a stock solution storage tank, an inclined tube settling tank, a sand filter tank, a pretreatment water production tank, a low-pressure RO (reverse osmosis) membrane unit and a concentrated solution storage tank which are sequentially connected through pipelines, wherein a pretreatment lifting pump for pumping the polluted water in the stock solution storage tank into the inclined tube settling tank and a medicament feeding device for feeding PAC (polyaluminium chloride) and PAM (polyacrylamide) medicaments into the inclined tube settling tank are arranged between the stock solution storage tank and the inclined tube settling tank, the sand filter tank is connected with a sludge discharge device, a filter is arranged between the sand filter tank and the pretreatment water production tank, a water inlet pump of the low-pressure RO membrane unit for pumping the water in the pretreatment water production tank into the low-pressure RO membrane unit and an acid scale inhibitor feeding device for adding acid and scale inhibitor into the low-pressure RO membrane unit are arranged between the pretreatment water production tank and the low-pressure RO membrane unit, the concentrated solution storage tank is connected with a concentrated solution discharge, and the low-pressure RO membrane unit is connected with a clear water discharge pipe.
As a further improvement of the above technical solution:
the treatment system further comprises a cleaning device for cleaning the sand filtration tank, the cleaning device comprises a cleaning tank and a cleaning pump, the cleaning pump is used for pumping cleaning water in the cleaning tank into the sand filtration tank, and the sand filtration tank is connected with an adjusting tank for collecting cleaning sewage.
The clear water delivery pipe divide into two way branch pipes, is cyclic utilization branch road all the way, and another way is direct discharge branch road, the cyclic utilization branch road is connected with the washing jar.
The sludge discharge device comprises a sludge collection tank and a sludge discharge pump, wherein the sludge discharge pump is used for pumping sludge in the inclined tube sedimentation tank into the sludge collection tank.
The medicament feeding device comprises a PAC medicament tank, a PAC medicament feeding pump, a PAM medicament tank, a PAM medicament feeding pump and a coagulation device, wherein the PAC medicament feeding pump is used for feeding PAC medicaments into the coagulation device, the PAM medicament feeding pump is used for feeding the PAM medicaments into the coagulation device, and the coagulation device is used for feeding the medicaments into the inclined tube settling tank according to a certain proportion.
The pretreatment lift pump is arranged at the upstream of the medicament feeding device, and a pretreatment water inlet flow meter is arranged between the pretreatment lift pump and the medicament feeding device.
The acid scale inhibitor feeding device comprises an acid storage tank, an acid adding pump, a scale inhibitor storage tank and a scale inhibitor adding pump, wherein the membrane unit water inlet pump is arranged at the upstream of the acid scale inhibitor feeding device, and a membrane unit water inlet flow meter is arranged between the membrane unit water inlet pump and the acid scale inhibitor feeding device.
And the clear water discharge pipe is provided with a clear water flow meter of the film unit.
And the concentrated solution discharge pipe is provided with a membrane set concentrated solution flowmeter and a concentrated solution lift pump for pumping the concentrated solution into the landfill operation area.
The filter is a bag filter.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses a receive landfill leachate to pollute processing system of groundwater, economy, reasonable, quick effective need not a large amount of reconstructions and enlargement on former filtration liquid treatment plant basis, only need purchase modular device to carry out the field installation and can realize a whole set of sewage treatment function, the existing facility of utilization that moreover can be reasonable.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of the processing flow of the processing system of the present invention.
The reference numerals in the figures denote:
1. a stock solution storage tank; 2. pre-treating a lift pump; 3. pre-treating the water inlet flowmeter; 4. a PAC dosing pump; 5. the medicament adding device comprises a PAC medicament tank; 6. a PAM medicament tank; 7. a PAM dosing pump; 8. a coagulation device; 9. a sludge collection tank; 10. a sludge discharge pump; 11. an inclined tube settling tank; 12. cleaning the tank; 13. cleaning the pump; 14. a sand filtration tank; 15. a regulating tank; 16. a filter; 17. pretreating a water production tank; 18. a water inlet pump of the film unit; 19. a film unit clean water flowmeter; 20. the acid scale inhibitor adding device comprises an acid storage tank; 21. adding an acid pump; 22. a low-pressure RO membrane unit; 23. a water inlet flow meter of the film unit; 24. adding a scale inhibitor pump; 25. a scale inhibitor storage tank; 26. a membrane unit concentrated juice flowmeter; 27. a concentrated solution storage tank; 28. a concentrate lift pump; 29. pumping the concentrated liquid into a landfill operation area; 30. a concentrate discharge pipe; 31. a clear water discharge pipe; 32. a branch is recycled; 33. directly discharging the branch.
Detailed Description
The invention is described in further detail below with reference to the drawings and specific examples.
As shown in fig. 1 and fig. 2, the system for treating groundwater polluted by landfill leachate of this embodiment includes a stock solution storage tank 1, an inclined tube precipitation tank 11, a sand filtration tank 14, a pretreatment water production tank 17, a low-pressure RO membrane unit 22 and a concentrated solution storage tank 27 which are connected in sequence by a pipeline, a pretreatment lift pump 2 for pumping polluted water in the stock solution storage tank 1 into the inclined tube precipitation tank 11 and a medicament adding device for adding PAC medicament and PAM medicament to the inclined tube precipitation tank 11 are disposed between the stock solution storage tank 1 and the inclined tube precipitation tank 11, the sand filtration tank 14 is connected with a sludge discharge device, a filter 16 is disposed between the sand filtration tank 14 and the pretreatment water production tank 17, a membrane unit water inlet pump 18 for pumping water in the pretreatment water production tank 17 into the low-pressure RO membrane unit 22 and an acid scale inhibitor adding device for adding acid and scale inhibitor to the low-pressure RO membrane unit 22 are disposed between the pretreatment water production tank 17 and the low-pressure RO membrane unit 22, the concentrated solution storage tank 27 is connected with a concentrated solution discharge pipe 30, and the low-pressure RO membrane unit 22 is connected with a clear water discharge pipe 31.
The stock solution storage tank 1 collects polluted water, the polluted water enters the inclined tube settling tank 11 through the pretreatment lifting pump 2, meanwhile, the PAC medicament and the PAM medicament are thrown into the inclined tube settling tank 11 according to a certain proportion by the medicament feeding device, the settled water overflows and enters the sand filtration tank 14, sludge is periodically discharged to a designated position by the sludge discharge device, the sand-filtered water finally enters the pretreatment water production tank 17 through the filter 16, and the pretreatment stage treatment is completed. The pre-treatment water is lifted to a low-pressure RO membrane unit 22 by a membrane unit water inlet pump 18, and simultaneously acid and scale inhibitor are put into the low-pressure RO membrane unit 22 by an acid scale inhibitor adding device according to a certain proportion, clear liquid of the membrane unit can be directly discharged through a clear water discharge pipe 31, and concentrated solution is discharged through a concentrated solution discharge pipe 30 after being collected, mainly discharged to a landfill operation area 29. The treatment system for the underground water polluted by the landfill leachate is economical, reasonable, rapid and effective, does not need to be reconstructed and expanded on the basis of the original leachate treatment plant, can realize the whole set of sewage treatment function only by purchasing modular equipment and carrying out field installation, and can reasonably utilize the existing facilities (a sludge pond, an adjusting tank, a landfill and the like).
In this embodiment, the filter 16 is preferably a bag filter.
In this embodiment, the treatment system further includes a cleaning device for cleaning the sand filtration tank 14, the cleaning device includes a cleaning tank 12 and a cleaning pump 13, the cleaning pump 13 is used for pumping cleaning water in the cleaning tank 12 into the sand filtration tank 14, and the sand filtration tank 14 is connected to a regulating reservoir 15 for collecting cleaning sewage. Wherein, the back flushing of the sand filtration tank 14 is regularly flushed according to the water inflow, the flushing water is discharged to the regulating tank 15, and the regulating tank 15 is a standard structure for constructing a percolate treatment plant and belongs to the existing facility.
In this embodiment, the clean water discharge pipe 31 is divided into two branch pipes, one branch pipe is a recycling branch 32, the other branch pipe is a direct discharge branch 33, the recycling branch 32 is connected with the cleaning tank 12, and the clean water collected from the low-pressure RO membrane unit 22 is used for washing the sand filtration tank 14. The clear water discharge pipe 31 is provided with a membrane unit clear water flow meter 19.
In this embodiment, the sludge discharge device includes a sludge collection tank 9 and a sludge discharge pump 10, and the sludge discharge pump 10 is used for pumping the sludge in the inclined tube settling tank 11 into the sludge collection tank 9. The sludge collecting tank 9 is a standard structure for constructing a percolate treatment plant and belongs to the existing facilities.
In this embodiment, the medicament feeding device includes a PAC medicament tank 5, a PAC medicament feeding pump 4, a PAM medicament tank 6, a PAM medicament feeding pump 7, and a coagulation device 8, the PAC medicament feeding pump 4 is used to feed PAC medicaments into the coagulation device 8, the PAM medicament feeding pump 7 is used to feed PAM medicaments into the coagulation device 8, and the coagulation device 8 is used to feed medicaments into the inclined tube settling tank 11 according to a certain proportion. The pretreatment lift pump 2 is arranged at the upstream of the medicament feeding device, and a pretreatment water inlet flow meter 3 is arranged between the pretreatment lift pump and the medicament feeding device.
In this embodiment, the acid scale inhibitor feeding device includes an acid storage tank 20, an acid adding pump 21, a scale inhibitor storage tank 25 and a scale inhibitor adding pump 24, the membrane set water inlet pump 18 is arranged at the upstream of the acid scale inhibitor feeding device, and a membrane set water inlet flow meter 23 is arranged between the two.
In this embodiment, a membrane module concentrate flow meter 26 and a concentrate lift pump 28 for pumping the concentrate into a landfill site 29 are provided on the concentrate discharge pipe 30.
In the embodiment, the sludge collection tank 9, the adjusting tank 15 and the landfill operation area 29 are all existing equipment, and existing facilities are reasonably utilized, so that the cost of the whole treatment system is reduced.
According to the water quality analysis of the polluted water, the method adopts the processes of inclined tube precipitation, sand filtration, ultrafiltration and low-pressure RO to carry out treatment, wherein the inclined tube precipitation, sand filtration and ultrafiltration are mainly used for removing SS in water, so that qualified water quality is provided for the subsequent processes, the removal rate is more than or equal to 95 percent, the SS content of the effluent is less than or equal to 5mg/L, and the water inlet requirement of a low-pressure RO membrane unit 22 is met. On the formula surface of the RO membrane machine, according to the interception characteristics, the operating pressure and the economical efficiency of various membrane elements, the SW seawater desalination membrane is used (the detailed characteristics of the membrane are shown in the table II), and the underground water polluted by the garbage percolate can reach the discharge standard of the GB16889-2008 table II after being treated by the processes of inclined tube precipitation, sand filtration, ultrafiltration and low-pressure RO. The specific process flow is shown in the second table:
relevant indexes of seawater desalination reverse osmosis membrane
It should be noted that, in the present invention, the MBR refers to a membrane biochemical reactor, which is a novel water treatment technology combining a membrane separation unit and a biological treatment unit. SBR refers to a sequential batch activated sludge treatment process. PAC refers to polyaluminum chloride (inorganic flocculant). PAM refers to polyacrylamide (organic flocculant). The SW membrane is a novel seawater desalination reverse osmosis membrane element with high desalination rate and high yield (low energy consumption).
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A receive processing system of landfill leachate polluted groundwater which characterized in that: including stoste storage tank (1), pipe chute gunbarrel (11), sand filtration jar (14), preliminary treatment product water pitcher (17), low pressure RO membrane unit (22) and concentrate storage tank (27) that connect gradually through the pipeline, be equipped with between stoste storage tank (1), pipe chute gunbarrel (11) and be used for the contaminated water pump in stoste storage tank (1) go into preliminary treatment elevator pump (2) in pipe chute gunbarrel (11) and be used for adding the medicament of PAC medicament and PAM medicament to pipe chute gunbarrel (11) and throw with the device, a row's mud device is connected to sand filtration jar (14), be equipped with filter (16) between sand filtration jar (14) and preliminary treatment product water pitcher (17), be equipped with between preliminary treatment product water pitcher (17) and low pressure RO membrane unit (22) and be used for carrying out the acid that adds in preliminary treatment product water pitcher (17) and add the acid scale inhibitor of low pressure RO membrane unit (22) and throw with acid scale inhibitor and throw with the dirt membrane unit and put with the dirt agent The device is characterized in that the concentrated solution storage tank (27) is connected with a concentrated solution discharge pipe (30), and the low-pressure RO membrane unit (22) is connected with a clear water discharge pipe (31).
2. The system of claim 1, wherein the system is configured to treat groundwater contaminated with landfill leachate: the treatment system further comprises a cleaning device for cleaning the sand filtering tank (14), the cleaning device comprises a cleaning tank (12) and a cleaning pump (13), the cleaning pump (13) is used for pumping cleaning water in the cleaning tank (12) into the sand filtering tank (14), and the sand filtering tank (14) is connected with a regulating tank (15) for collecting cleaning sewage.
3. The system of claim 2, wherein the system is further configured to: clear water discharge pipe (31) divide into two way branch pipes, is cyclic utilization branch road (32) all the way, and another way is direct discharge branch road (33), cyclic utilization branch road (32) are connected with washing jar (12).
4. The system for the treatment of groundwater contaminated with landfill leachate according to any of claims 1 to 3, wherein: the sludge discharge device comprises a sludge collection tank (9) and a sludge discharge pump (10), wherein the sludge discharge pump (10) is used for pumping sludge in the inclined tube settling tank (11) into the sludge collection tank (9).
5. The system for the treatment of groundwater contaminated with landfill leachate according to any of claims 1 to 3, wherein: the drug adding device comprises a PAC drug tank (5), a PAC drug adding pump (4), a PAM drug tank (6), a PAM drug adding pump (7) and a coagulation device (8), wherein the PAC drug adding pump (4) is used for adding PAC drugs into the coagulation device (8), the PAM drug adding pump (7) is used for adding PAM drugs into the coagulation device (8), and the coagulation device (8) is used for adding drugs into an inclined tube settling tank (11) according to a certain proportion.
6. The system for the treatment of groundwater contaminated with landfill leachate according to any of claims 1 to 3, wherein: the pretreatment lift pump (2) is arranged at the upstream of the medicament feeding device, and a pretreatment water inlet flow meter (3) is arranged between the pretreatment lift pump and the medicament feeding device.
7. The system for the treatment of groundwater contaminated with landfill leachate according to any of claims 1 to 3, wherein: the acid scale inhibitor feeding device comprises an acid storage tank (20), an acid adding pump (21), a scale inhibitor storage tank (25) and a scale inhibitor adding pump (24), wherein a membrane unit water inlet pump (18) is arranged at the upstream of the acid scale inhibitor feeding device, and a membrane unit water inlet flow meter (23) is arranged between the acid scale inhibitor feeding device and the membrane unit water inlet pump.
8. The system for the treatment of groundwater contaminated with landfill leachate according to any of claims 1 to 3, wherein: and a clear water flow meter (19) of the film unit is arranged on the clear water discharge pipe (31).
9. The system for the treatment of groundwater contaminated with landfill leachate according to any of claims 1 to 3, wherein: and a membrane unit concentrated solution flowmeter (26) and a concentrated solution lift pump (28) for pumping the concentrated solution into a landfill operation area (29) are arranged on the concentrated solution discharge pipe (30).
10. The system for the treatment of groundwater contaminated with landfill leachate according to any of claims 1 to 3, wherein: the filter (16) is a bag filter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113105079A (en) * | 2021-05-19 | 2021-07-13 | 浙江九达环保科技有限公司 | Polluted underground water remediation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113105079A (en) * | 2021-05-19 | 2021-07-13 | 浙江九达环保科技有限公司 | Polluted underground water remediation method |
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