CN202849197U - Deep purification and combined denitrification system for polluted ground water - Google Patents

Deep purification and combined denitrification system for polluted ground water Download PDF

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Publication number
CN202849197U
CN202849197U CN2012202572336U CN201220257233U CN202849197U CN 202849197 U CN202849197 U CN 202849197U CN 2012202572336 U CN2012202572336 U CN 2012202572336U CN 201220257233 U CN201220257233 U CN 201220257233U CN 202849197 U CN202849197 U CN 202849197U
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China
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wetland
water
current wetland
level current
nitrogen
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CN2012202572336U
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沈来新
刘培斌
王国青
魏文侠
夏广卿
徐志刚
张琦伟
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BEIJING INSTITUTE OF WATER
Environmental Protection Institute of Light Industry
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BEIJING INSTITUTE OF WATER
Environmental Protection Institute of Light Industry
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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

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  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

The utility model relates to a deep purification and combined denitrification system for polluted ground water, comprising an aerobic biological fluidized tank, a primary subsurface wetland and a secondary subsurface wetland which are sequentially connected. According to the utility model, in the purification process, the polluted ground water is lifted to the aerobic biological fluidized tank by using a lifting pump and most ammonia nitrogen in the polluted water is directly oxidized into nitrate nitrogen in the aeration process under the action of nitrifying microorganisms; sewage enters the primary subsurface wetland and the rest ammonia nitrogen is further oxidized into the nitrate nitrogen under the aerobic condition; and then the sewage enters the secondary subsurface wetland, the denitrification is completed under the anaerobic condition and the nitrate nitrogen is reduced into nitrogen. According to the utility model, the water quality characteristic that the landfill leachate-polluted ground water is high in organic matter content and ammonia nitrogen content is utilized and the aerobic biological fluidized tank and the constructed wetland technology are combined, so that the system has the advantages that the ammonia nitrogen removing rate after the purification is up to more than 99%, the nitrate effluent concentration is less than 5mg/L and the treated polluted ground water completely meets the water quality standard of drinking water in the aspects of ammonia nitrogen concentration and nitrate concentration.

Description

Polluted Groundwater deep purifying combined denitrification system
Technical field
The utility model relates to a kind of Polluted Groundwater deep purifying treatment technology, particularly relates to employing ABFT-Combination System of Constructed Wetland improvement and is subjected to Landfill Leachate Pollution underground water.
Background technology
Along with the develop rapidly in city, percolate groundwater pollution problem is constantly aggravated.For example total refuse tip, 14 districts, Beijing is 1005, takes in 4,674 ten thousand tons in rubbish.Wherein, the informal quantity of refuse of not doing strict antiseepage is 3,233 ten thousand tons, accounts for 69.2%, and percolate becomes one of primary pollution source of Beijing's shallow ground water.To the underground water that has polluted, the developed countries such as America and Europe have developed many Pollution abatement technology since 20 century 70s, such as permeable reactive grid technology, biology in situ recovery technique, waterpower isolation technology, chemical treatment, curing technology and vacuum extraction etc.
The organism fluidization pond is the immobilization technology of employing biological enzyme and carrier carries out treatment and purification to polluted-water technique.Microbe carrier is a kind of cancellated high molecular synthetic material in space that has, this material is with amino, carboxyl, epoxy group(ing) isoreactivity group, in sewage, have satisfactory stability and physical and chemical performance, its voidage is more than 96%, because the characteristics of its structure, can make sewage, air obtains abundant blending with microbial film and contacts exchange, microbial film can not only be mounted the throne in microbe carrier in large quantities, keep good activity and space mutability, and in operational process gas under the sewage of triflux drives, the microbe carrier that runs foul of each other and be in the wriggling state constantly cuts into less bubble, increased the utilization ratio of oxygen, can reduce aeration rate, thereby reach energy-conservation purpose.
Microorganism is fixed on filling surface in a large number with biomembranous form, the part microorganism forms the mud particle in void among particles simultaneously, thereby obtain the high concentration microorganism amount, and guarantee that organic matter is evenly distributed in the medium, thereby make the system realize best mass transfer, solved ideally the difficult problem that system and microorganism fully contact.Adopted the particulate filler of high-specific surface area as bio-carrier, and used targetedly effectively compound microbial bacterial classification enforcement biofilm, realized that required bacterial classification becomes the purpose of dominant microflora, has significantly improved the removal effect to target contaminant; Ammonia nitrogen in the sewage, TN there is preferably removal effect.
Artificial wet land system is removed the purification of nitrogen and is mainly jointly finished by physics, chemistry and biological number of ways by plant, matrix and microorganism etc., and wherein the removal with the wetland microorganism act as the master.Microbial denitrogenation is carried out in two steps, and the first step ammonia nitrogen is oxidized to nitric nitrogen, i.e. nitrification, and nitrification is aerobic processes, is mainly finished under good batten spare by nitrite bacteria and nitrobacteria.Second step makes nitrate-nitrogen reduction become nitrogen, i.e. denitrification, and denitrification process is to be finished under anoxia condition by denitrifying bacterium,
Because the ammonia nitrogen concentration in the former water of Landfill Leachate Pollution is up to dozens or even hundreds of mg/L, and the water quality standard that satisfies drinking water standard requires to reach 0.5mg/L, rely on individual event biology/materialization treatment process in the application of Polluted Groundwater, undesirable to organic pollutant and total nitrogen treatment effect, therefore the deficiency that also has simultaneously the aspects such as working cost is too high, complex process needs research and development badly for refining plant and the technique of awarding Landfill Leachate Pollution quality of groundwater characteristics.
The utility model content
The purpose of this utility model is to overcome existing individual event biological process/physico-chemical process technique and is processing the technical deficiency of serious pollution ground water cleaning, for being subjected to organism and the high water quality characteristics of ammonia-nitrogen content in the Landfill Leachate Pollution underground water, a kind of Polluted Groundwater deep purifying combined denitrification system that comprises ABFT-artificial wetland combination system is provided, thereby guarantees the efficient removal of ammonia nitrogen, nitrate.
For achieving the above object, the utility model comprises following technical scheme:
A kind of Polluted Groundwater deep purifying combined denitrification system comprises the ABFT, one-level current wetland and the secondary current wetland that connect successively.
Aforesaid system, preferably, described ABFT bottom arranges micro-pore aeration system, and filling proportion in the pond is 0.8g/cm 3～0.95g/cm 3The porous polymer filler as microbe carrier, packed height is 0.5m～2.5m.
Aforesaid system, preferably, described porous polymer filler is the polyurethane sponge.
Aforesaid system, preferably, described one-level current wetland and secondary current wetland consist of by wetland body of wall, impervious barrier, wetland medium layer, insulation plantation layer and wetland plant;
Wherein, this insulation plantation layer, wetland medium layer and impervious barrier are stacked settings from top to bottom;
The mixture that this insulation plantation layer is comprised of the peat composed of rotten mosses and thick river sand, both proportionings are 0.5～1: 1; Mixture filling thickness is 150mm～250mm, the upper plantation of insulation plantation layer wetland plant;
This wetland dielectric material is selected from Wingdale, gravel, vermiculite, volcanics and/or the haydite that diameter is 5mm～120mm, and filling thickness is 800mm～1400mm;
This one-level current wetland and secondary current wetland periphery arrange respectively the wetland body of wall; The one side wall body bottom of this one-level current wetland arranges water-in, and opposite side body of wall on the other side top sets out the mouth of a river; The one side wall body bottom of this secondary current wetland arranges water-in, and opposite side body of wall on the other side top sets out the mouth of a river; The water-in of this one-level current wetland is connected with described ABFT water outlet, and the water outlet of this one-level current wetland is connected with the water-in of this secondary current wetland.
Aforesaid system preferably, arranges distributing flue in the middle of described one-level current wetland and the secondary current wetland, and the water outlet of one-level current wetland connects distributing flue by upflow tube, and the distributing flue bottom arranges and is connected with the water-in of secondary current wetland communicating pipe.
The beneficial effects of the utility model are: for the composition characteristic that is subjected to Landfill Leachate Pollution underground water, the sewage disposal technology reasonable combination that the utility model will have difference in functionality forms high-efficient purification combined denitrification system.Wherein, ABFT is nitric nitrogen with the direct oxidation in aeration process of the most ammonia-nitrogen in the polluted water, and ammonia nitrogen concentration is reduced to about 5mg/L.Subsequently, the one-level current wetland is further oxidized to nitric nitrogen with remaining ammonia nitrogen under aerobic condition.The aerobic environment of one-level current wetland is mainly derived from dissolved oxygen entrained in the ABFT water outlet (more than the 5mg/L).By the aeration intensity of control ABFT and the hydraulic detention time of one-level current wetland the water outlet dissolved oxygen concentration of one-level current wetland is reduced to below the 0.5mg/L, thereby guarantees the anaerobic environment of secondary current wetland.The secondary current wetland is under anaerobic finished denitrification, and nitrate-nitrogen reduction becomes nitrogen.Experimental result shows, use the sewage of system purification of the present utility model, the clearance of ammonia nitrogen reaches more than 98%, and ammonia nitrogen goes out water concentration less than 0.5mg/L, nitrate goes out water concentration less than 10mg/L, and the underground water of pollution satisfies water quality standard for drinking water fully by processing rear ammonia nitrogen and nitrate concentration.
Description of drawings
Fig. 1 is the structural representation of the Polluted Groundwater deep purifying combined denitrification system of a kind of preferred implementation of the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is further elaborated.
Embodiment 1 Polluted Groundwater deep purifying combined denitrification system
As shown in Figure 1, in a kind of preferred implementation of the present utility model, Polluted Groundwater deep purifying combined system mainly comprises ABFT 1, one-level current wetland 2 and the secondary current wetland 3 that connects successively.
ABFT 1 is brick mix structure, and specification is 12m * 1.0m * 1.5m (long * wide * dark).The ABFT bottom arranges micro-pore aeration system.Filling proportion in the pond is 0.8g/cm 3～0.95g/cm 3The porous polymer filler as microbe carrier.Native system can use the conventional microbial carrier material that is used for ABFT, as long as it is to have the cancellated macromolecular material in space, and in the structure with amino, carboxyl, epoxy group(ing) isoreactivity group.Porous polymer filler in the present embodiment is the polyurethane sponge filler.Packed height is 1.0m.Can adopt conventional biological domestication method that filler is carried out the biofilm of microorganism, adopt in the present embodiment to add complex microorganism bacterial classification (available from the prompt sunshine bioenvironmental engineering in Lanzhou company limited) in the ABFT and carry out vexed mode of exposing to the sun and realize.ABFT 1 has adopted micro-pore aeration system, and aeration is even, has cancelled the protective belt (0.5m～0.7m) on conventional ABFT top.Water outlet enters the artificial swamp advanced treatment, only at water outlet the carrier catch net is set, cancelled mud collection area (0.5m～0.8m), thus make pond body virtual height increase 1.0m～1.5m, reduced the construction investment of ABFT.
One-level current wetland 2 and secondary current wetland 3 from top to bottom are cascading and are incubated plantation layer 21, wetland medium layer 22, back fill course 23 and impervious barrier 24.The mixture that insulation plantation layer 21 is comprised of the peat composed of rotten mosses and thick river sand, both weight ratios are 1: 1, filling thickness is 200mm, the upper plantation of insulation plantation layer wetland plant 27.One-level current wetland 2 can be the mixed or native pond seepage prevention of skeleton construction, brick, it is brick mix structure in the present embodiment, specification is 22m * 12m * 1.2m (long * wide * dark), the filler of wetland medium layer 22 is that haydite and Wingdale weight ratio are 1: 1 mixture, and filling thickness is 900mm～1000mm.Secondary current wetland 3 can be the mixed or native pond seepage prevention of skeleton construction, brick, it is brick mix structure in the present embodiment, specification is 25m * 12m * 1.2m (long * wide * dark), the filler of wetland medium layer 22 is that haydite and volcanics weight ratio are 1: 1 mixture, and filling thickness is 900mm～1000mm.
The one side wall body bottom of one-level current wetland 2 arranges water-in 25, and opposite side body of wall on the other side top sets out the mouth of a river 26.The one side wall body bottom of secondary current wetland 3 arranges water-in 35, and opposite side body of wall on the other side top sets out the mouth of a river 36.The water-in 25 of one-level current wetland is connected with ABFT water outlet 11.Distributing flue 4 is set in the middle of one-level current wetland and the secondary current wetland, and the water outlet 26 of one-level current wetland connects distributing flue 4 by upflow tube 41, and the distributing flue bottom arranges and is connected with secondary current wetland water-in 35 communicating pipe 42.
Embodiment 2 Polluted Groundwater cleaning tests
Contaminated water source is near the underground water the refuse landfill of Beijing area, former water ammonia nitrogen concentration is 21.5mg/L～30.5mg/L, Application Example 1 described system disposes of sewage, promote polluted underground water by lift pump and deliver to ABFT, hydraulic detention time is 2.4h, and volumetric loading is 0.5kgTN/ (m 3D), gas-water ratio is 5: 1, and ammonia nitrogen concentration is reduced to 4.2mg/L～5.5mg/L after processing.
Thereafter, sewage enters the one-level current wetland by the ABFT water outlet, and hydraulic detention time is 25h, and surface load is 0.45m 3/ (m 3D), process rear ammonia nitrogen concentration and reduce most 0.5mg/L～1.2mg/L.
Sewage after the one-level current wetland is processed enters the secondary current wetland, and hydraulic detention time is 29h, and surface load is 0.4m 3/ (m 3D), process rear ammonia nitrogen concentration and reduce most 0.2mg/L～0.4mg/L.
Through the underground water that above-mentioned steps is processed, the clearance of ammonia nitrogen is 99%, and it is 4.9mg/L～8.6mg/L that nitrate goes out water concentration, satisfies water quality standard for drinking water.

Claims (5)

1. a Polluted Groundwater deep purifying combined denitrification system is characterized in that, it comprises ABFT, one-level current wetland and the secondary current wetland that connects successively.
2. the system as claimed in claim 1 is characterized in that, described ABFT bottom arranges micro-pore aeration system, and filling proportion in the pond is 0.8g/cm 3～0.95g/cm 3The porous polymer filler as microbe carrier, packed height is 0.5m～2.5m.
3. system as claimed in claim 2 is characterized in that, described porous polymer filler is the polyurethane sponge.
4. the system as claimed in claim 1 is characterized in that, described one-level current wetland and secondary current wetland consist of by wetland body of wall, impervious barrier, wetland medium layer, insulation plantation layer and wetland plant;
Wherein, this insulation plantation layer, wetland medium layer and impervious barrier are stacked settings from top to bottom;
This insulation plantation layer thickness is 150mm～250mm, the upper plantation of insulation plantation layer wetland plant;
This wetland dielectric material is selected from Wingdale, gravel, vermiculite, volcanics and/or the haydite that diameter is 5mm～120mm, and filling thickness is 800mm～1400mm;
This one-level current wetland and secondary current wetland periphery arrange respectively the wetland body of wall; The one side wall body bottom of this one-level current wetland arranges water-in, and opposite side body of wall on the other side top sets out the mouth of a river; The one side wall body bottom of this secondary current wetland arranges water-in, and opposite side body of wall on the other side top sets out the mouth of a river; The water-in of this one-level current wetland is connected with described ABFT water outlet, and the water outlet of this one-level current wetland is connected with the water-in of this secondary current wetland.
5. system as claimed in claim 4, it is characterized in that, in the middle of described one-level current wetland and the secondary current wetland distributing flue is set, the water outlet of one-level current wetland connects distributing flue by upflow tube, and the distributing flue bottom arranges and is connected with the water-in of secondary current wetland communicating pipe.
CN2012202572336U 2012-06-01 2012-06-01 Deep purification and combined denitrification system for polluted ground water Expired - Lifetime CN202849197U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102775005A (en) * 2012-06-01 2012-11-14 北京市水利规划设计研究院 Polluted underground water deep purification combined denitrification system and process method
CN103739081A (en) * 2014-01-13 2014-04-23 上海交通大学 Subsurface flow wetland device for enhanced nitrogen removal of low-pollution water
CN111777263A (en) * 2020-06-05 2020-10-16 成都工业学院 Resourceful treatment method for aquaculture wastewater

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102775005A (en) * 2012-06-01 2012-11-14 北京市水利规划设计研究院 Polluted underground water deep purification combined denitrification system and process method
CN103739081A (en) * 2014-01-13 2014-04-23 上海交通大学 Subsurface flow wetland device for enhanced nitrogen removal of low-pollution water
CN103739081B (en) * 2014-01-13 2015-10-14 上海交通大学 A kind of current wetland device for low-pollution water strengthened denitrification
CN111777263A (en) * 2020-06-05 2020-10-16 成都工业学院 Resourceful treatment method for aquaculture wastewater

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Granted publication date: 20130403