CN101412564B - Wet land technique for deep purification of tail water of sewage plant - Google Patents

Wet land technique for deep purification of tail water of sewage plant Download PDF

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CN101412564B
CN101412564B CN2008101951282A CN200810195128A CN101412564B CN 101412564 B CN101412564 B CN 101412564B CN 2008101951282 A CN2008101951282 A CN 2008101951282A CN 200810195128 A CN200810195128 A CN 200810195128A CN 101412564 B CN101412564 B CN 101412564B
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water
flow
filter tank
wetland
pond
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CN101412564A (en
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李文朝
冯慕华
潘继征
李爱权
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Nanjing Institute of Geography and Limnology of CAS
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Nanjing Institute of Geography and Limnology of CAS
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

The invention discloses a wetland process for deep purification of tail water of a sewage plant, which comprises the tail water of the sewage plant, a limestone filter pool, a submerged plant oxidation pond, a vertical-flow wetland, a surface-flow wetland, a composite substrate filter pool, an ecological reoxygenation pond and a receiving water body. The wetland process has the characteristics ofefficient and ecological denitrification and dephosphorization, utilizes a water head with the height of about 0.5m to automatically flow, has the hydraulic load of 200mm/d, has no energy consumptionand drug consumption, is anti-clogging, and can perpetually and steadily operate with low cost; the removal rate of nitrogen and phosphorus is higher than 95 percent, and the water quality of water output is superior to the GB3838-2002 ground surface class III water standard. The wetland process is suitable for the deep purification of the tail water of small sewage plants in cities and towns, and the treated output water can be recycled in water-deficient areas and can serve as a high-quality water source for the supply of water bodies of landscapes in the cities or residential areas. The process needs larger land area which can be merged into a whole with green areas and wetland parks of the cities. In the sewage plant of Eryuan county, Yunnan province, the process is utilized to build 2.2 hectares of wetland engineering for the deep purification of the tail water, the daily water treatment capacity is 4,000m<3>, the sewage plant has been steadily operated for 5 years, and the annual operation management cost is fifty thousand yuan.

Description

A kind of wet land technique that is used for deep purification of tail water of sewage plant
Affiliated technical field:
Deep purification of waste water and reuse project technology.The present invention relates to a kind of constitution wetland technology, be used for the deep purifying of Sewage Plant tail water, water outlet reaches GB ground Table III class water, without any energy consumption and medicine consumption, and ton water treatment expense<0.10 yuan.This engineering is applicable to samll cities and towns' deep purification of tail water of sewage plant, reaches targets such as water-deficient area reusing sewage, extremely sensitive regional water prevention and cure of pollution.
Background technology:
In the drought and water shortage area, Sewage Plant tail water is a class water yield and all more stable water resources of water quality, and is higher through reuse value ratio behind the deep purifying; In extremely sensitive zone, Sewage Plant tail water then is important pollution sources, carries out deep purifying, prevents that its pollution to river, lake is very necessary.Deep purification of tail water of sewage plant is no lack of modern technique, but the expense that adopts these modern techniquies to produce generally is not less than the sewage disposal expense.For those less-developed drought and water shortage areas, perhaps the relatively more outstanding developing region of those water pollution problemss is more craved for economical and practical deep purification of tail water of sewage plant technology.
Entrusted by state, Dali, Yunnan Province Bureau for Environmental Protection, Eryuan County, upstream, Erhai sewage treatment plant tail water is implemented wetland deep purifying, water yield 4000m 3/ d requires water outlet to reach GB3838-2002 ground Table III class water quality.We have researched and developed the present invention in view of the above, a kind of wet land technique that is used for deep purification of tail water of sewage plant, and successfully built experimental project, reached water quality objective.
Summary of the invention:
Target of the present invention is: research and development deep purification of tail water of sewage plant wet land technique, realize the dephosphorization of no energy consumption ecological wetland advanced nitrogen, and water outlet reaches ground Table III class water quality standard, and can lasting stability move, and mainly comprises following content.
1. gravity flow advanced nitrogen dephosphorization wet land technique
At becoming these characteristics of key problem, researched and developed following wetland purification technology through active organic carbon scarcity, advanced nitrogen dephosphorization in the sewage of secondary biochemical treatment:
Wingdale filter tank → submerged plant oxidation pond → vertical-flow wetland → surface-flow → composite interstitial substance filter tank → ecological reoxygenation pond
As shown in Figure 1: Sewage Plant tail water enters cloth ditch, Wingdale filter tank (2) via underground aqueduct (1), Wingdale filter tank water distributor (3) by the bottom enters the Wingdale filter tank, rise to the free water layer in Wingdale filter tank (5) at Wingdale filter tank filter material layer (4), fall into adjacent submerged plant oxidation pond (7) through Wingdale filter tank overflow crest of weir (6) again; Horizontal flow is to the other end of pond body in the submerged plant oxidation pond, enter vertical-flow wetland packing layer (9) via vertical-flow wetland water distributor (8), rise to the free water layer of vertical-flow wetland (10) at packing layer, fall into adjacent surface-flow cloth ditch (12) through vertical-flow wetland overflow crest of weir (11) again; Current pass through surface-flow water distribution crest of weir (13) again and enter surface-flow (14), and horizontal flow falls into adjacent surface-flow collecting gutter (16) through surface-flow overflow crest of weir (15) again to the other end in surface-flow; Composite interstitial substance filter tank water distributor (17) by the bottom enters composite interstitial substance filter tank filter material layer (18) again, rise to the free water layer in composite interstitial substance filter tank (19) at filter material layer, fall into adjacent ecological reoxygenation pond (21) through composite interstitial substance filter tank overflow crest of weir (20) again, pass through water outlet culvert pipe (22) at last and efflux.
The major function in Wingdale filter tank is that solid pollutant and phosphorus are removed in absorption, the superpower well-oxygenated environment that the submerged plant oxidation pond then utilizes the submerged plant photosynthetic oxygen evolution to produce is realized the nitrated and dephosphorization of ammonia nitrogen, in vertical-flow wetland, finish denitrification denitrogenation, in surface-flow, utilize adsorption by soil-wetland plant sorption further to remove nitrogen, phosphorus, in the composite interstitial substance filter tank, utilize composite interstitial substance absorption-wetland plant sorption further to remove nitrogen, phosphorus, finish the recovery of current nature physical attribute in ecological reoxygenation pond.Finish the whole residence time of scavenging process needs more than 10 days, wherein the residence time in the submerged plant oxidation pond needed more than 7 days, and the pond body degree of depth can reach about 2m.
2. the submerged plant oxidation pond replenishes active organic carbon
The active organic carbon scarcity is the key constraints of restriction micro-organisms denitrogenation in the Sewage Plant tail water, generally will realize through the artificial active organic carbon that adds.The present invention utilizes the submerged plant oxidation pond, when finishing bio-oxidation, in water body, replenish active organic carbon by submerged plant and periphyton thereof, not only make nitrifying process smooth, also, ensured the thoroughness of denitrogenation for follow-up denitrification process provides carbon source.But general Sewage Plant tail water is relatively more muddy, contains a certain amount of suspended solid and microorganism, becomes the limiting factor of submerged plant existence; The present invention utilizes the Wingdale filter tank that Sewage Plant tail water is carried out adsorption filtration, has clarified water quality, has brought up the life condition of submerged plant in the submerged plant oxidation pond.
3. anti-block vertical flow wetland structure
Among the present invention, in the Wingdale filter tank, vertical-flow wetland and composite interstitial substance filter tank all adopt no block vertical flow wetland structure (Fig. 1), its principle such as Fig. 2 show.That water distributor (23) two ends of pond body bottom all are exposed to is outer, and (Fig. 2-a), the water distributor feed-water end lead directly to cloth ditch (24), and the other end is exposed to bottom the adjacent pool body (26) after with spiral plug (25) shutoff.If water distributor 23 takes place to stop up or current are not smooth, can open spiral plug (25), utilize the pressure reduction at water distributor (23) two ends to form the flushing current, what plug thing is gone out (Fig. 2-b); If packing layer (27) stops up, can connect submersible pump (28) at water distributor (23) feed-water end and wash (Fig. 2-c).So vertical flow wetland structure can prevent to stop up by routine cleaning, ensures the lasting stability operation.
4. big section low resistance does not have the energy consumption operation
Take the flow process miniaturized design, wherein vertical current is all adopted in Wingdale filter tank, vertical-flow wetland and composite interstitial substance filter tank, submerged plant oxidation pond, surface-flow and ecological reoxygenation pond are water-carrying section with body transverse section, pond then, reduced and crossed water resistance, the head loss of each grade wetland has only 0.10m, has realized utilizing the no energy consumption operation of nature head.
The present invention has perfect wetland purification technology and structure, mainly contains following advantage:
(1) advanced nitrogen dephosphorization reaches more than 95% the clearance of nitrogen, phosphorus in the Sewage Plant tail water.
(2) no energy consumption, no medicine consumption, low cost movement, whole wet land system gravity flow, and rely on natural, ecological to purify fully, ton water purifying treatment expense<0.10 yuan.
(3) technology maturation has realized the through engineering approaches application, and " the Eryuan County deep purification of tail water of sewage plant wetland technology demonstration project " built up in 2004 moved 5 years, and be reliable and stable.
Description of drawings:
Fig. 1---deep purification of tail water of sewage plant wet land technique synoptic diagram
Fig. 2---anti-block vertical flow wetland structure synoptic diagram
Among the figure: 1. aqueduct, 2. Wingdale filter tank cloth ditch, 3. Wingdale filter tank water distributor, 4. Wingdale filter tank filter material layer, the 5. free water layer in Wingdale filter tank, 6. Wingdale filter tank overflow crest of weir, 7. submerged plant oxidation pond, 8. vertical-flow wetland water distributor, 9. vertical-flow wetland packing layer, 10. the free water layer of vertical-flow wetland, 11. vertical-flow wetland overflow crests of weir, 12. surface-flow cloth ditches, 13. surface-flow water distribution crest of weir, 14. surface-flow, 15. surface-flow overflow crests of weir, 16. surface-flow collecting gutters, 17. composite interstitial substance filter tank water distributor, 18. composite interstitial substance filter tank filter material layer, the free water layer in 19. composite interstitial substance filter tanks, 20. composite interstitial substance filter tank overflow crests of weir, 21. ecological reoxygenation pond, 22. the water outlet culvert pipe, 23. cloth ditches, 24. water distributors, 25. plug, 26. filler, 27. adjacent pool bodies, 28. submersible pumps.
Embodiment:
The present invention carries out engineering according to following steps and uses:
1. the pond body is built by laying bricks or stones
(1) to grout free stone masonry pond body.
(2) doing the antiseepage of the ridge, pond with sand-cement slurry handles.
(3) do at the bottom of the pond antiseepage and handle to roll trinity mixture fill.
2. pipeline laying
(1) in the Wingdale filter tank, vertical-flow wetland, composite interstitial substance filter tank bottom lays water distribution pipe with interval 0.5m.
(2) bury the aqueduct that causes cloth ditch, Wingdale filter tank from the Sewage Plant discharge outlet underground.
(3) bury the water outlet culvert pipe that causes the admittance river course from ecological reoxygenation pond underground.
3. matrix is filled
(1) filled stone lime stone rubble in the Wingdale filter tank, particle diameter 20~30mm.
(2) in vertical-flow wetland, fill gravel, particle diameter 20~30mm.
(3) in the composite interstitial substance filter tank, fill composite interstitial substance.
(4) silty loam of laying 0.2m thickness in submerged plant oxidation pond and ecological reoxygenation pond.
4. vegetation is set up
(1) whole wet land system water-filling.
(2) in Wingdale filter tank, vertical-flow wetland and composite interstitial substance filter tank, plant emergent.
(3) in submerged plant oxidation pond and ecological reoxygenation pond, plant planting submerged plant.
5. operation and management
(1) wet land system water inlet operation.
(2) muskeg is managed in good time.
Applicating example:
The present invention is able to successful Application in the sewage treatment plant tail water deep purifying wetland technology demonstration project of Eryuan County, state, Dali, Yunnan Province.This project was built up in 2004,2.2 hectares of floor spaces (33 mu), and water yield 4000m is handled in 3,900,000 yuan of construction investments 3/ d, nitrogen, tp removal rate, nitrogen, phosphorus content are well below GB3838-2002 ground Table III class water quality standard (seeing the following form) in the water outlet.This project is stable over 5 years, and latch up phenomenon did not take place.
The Cai Shui place Total nitrogen (mg/L) Ammonia nitrogen (mg/L) Total phosphorus (mg/L)
Sewage Plant tail water 7.94±0.26 4.01±0.51 0.503±0.123
The water outlet of Wingdale filter tank 6.23±0.07 3.16±0.04 0.384±0.122
The water outlet of submerged plant oxidation pond 3.93±0.58 0.50±0.11 0.119±0.048
The vertical-flow wetland water outlet 0.41±0.01 0.13±0.00 0.066±0.016
The surface-flow water outlet 0.19±0.06 0.08±0.04 0.064±0.050
The water outlet of composite interstitial substance filter tank 0.17±0.03 0.08±0.02 0.038±0.017
Ecological reoxygenation pond water outlet 0.10±0.02 0.05±0.02 0.022±0.008
The total clearance of pollutent 99.9% 98.8% 95.6%
The highest the limiting the quantity of of ground Table III class water 1 0.2

Claims (2)

1. the wet land technique that is used for deep purification of tail water of sewage plant, it is characterized in that, purification process is: Wingdale filter tank → submerged plant oxidation pond → vertical-flow wetland → surface-flow → composite interstitial substance filter tank → ecological reoxygenation pond, water flow mode is: Sewage Plant tail water enters cloth ditch, Wingdale filter tank (2) via underground aqueduct (1), Wingdale filter tank water distributor (3) by the bottom enters the Wingdale filter tank, rise to the free water layer in Wingdale filter tank (5) at Wingdale filter tank filter material layer (4), fall into adjacent submerged plant oxidation pond (7) through Wingdale filter tank overflow crest of weir (6) again; Horizontal flow is to the other end of pond body in the submerged plant oxidation pond, enter vertical-flow wetland packing layer (9) via vertical-flow wetland water distributor (8), rise to the free water layer of vertical-flow wetland (10) at packing layer, fall into adjacent surface-flow cloth ditch (12) through vertical-flow wetland overflow crest of weir (11) again; Current pass through surface-flow water distribution crest of weir (13) again and enter surface-flow (14), and horizontal flow falls into adjacent surface-flow collecting gutter (16) through surface-flow overflow crest of weir (15) again to the other end in surface-flow; Composite interstitial substance filter tank water distributor (17) by the bottom enters composite interstitial substance filter tank filter material layer (18) again, rise to the free water layer in composite interstitial substance filter tank (19) at filter material layer, fall into adjacent ecological reoxygenation pond (21) through composite interstitial substance filter tank overflow crest of weir (20) again, pass through water outlet culvert pipe (22) at last and efflux.
2. according to the described technology of claim 1, it is characterized in that, the wetland flow field ensures that with big section low resistance flow process minimizes, the vertical water stream mode is all adopted in Wingdale filter tank, vertical-flow wetland and composite interstitial substance filter tank, and submerged plant oxidation pond, surface-flow and ecological reoxygenation pond are water-carrying section with body transverse section, pond then.
CN2008101951282A 2008-11-06 2008-11-06 Wet land technique for deep purification of tail water of sewage plant Active CN101412564B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101746933B (en) * 2009-12-14 2012-02-08 竹溪创艺皂素有限公司 Process of ecological pond- sheet current wetland complex system for deeply processing saponin waste water
CN102107982A (en) * 2009-12-23 2011-06-29 中国科学院生态环境研究中心 Ecological engineering combination technology for deep purification of nutritive salts in reclaimed water
CN104961288B (en) * 2014-08-12 2017-06-06 上海水生环境工程有限公司 The sewage disposal system that ecological oxidation ditch is combined with ecological box wetland
CN105645561A (en) * 2014-11-14 2016-06-08 重庆大学 A biomembrane deep denitrification and phosphorus removal reactor for a tail-water pressure conveying pipeline and a tail water deep-treatment method therefore
CN104591396B (en) * 2015-01-31 2017-01-04 青岛水务集团有限公司科技中心 Recycled water Wetland ecological cleaning system
CN110054369B (en) * 2019-05-31 2020-05-12 山东大学 Method for achieving standard operation in winter by ecological configuration of oil extraction high-salinity sewage constructed wetland

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