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Subsurface wetland system capable of improving nitrogen and phosphorus removal effects of tail water in sewage plant and avoiding bioclogging

A technology for denitrification and phosphorus removal, subsurface wetlands, applied in water pollutants, biological treatment devices, sustainable biological treatment, etc., can solve the problems of insufficient effective carbon source and high nitrate content

Inactive Publication Date: 2015-05-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a technical method combining subsurface flow wetland and sulfur autotrophic denitrification to solve the problems of high nitrate content and insufficient effective carbon source in the tail water of existing sewage plants, so as to achieve effective denitrification and at the same time Can avoid the biological clogging problem common in subsurface wetlands

Method used

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  • Subsurface wetland system capable of improving nitrogen and phosphorus removal effects of tail water in sewage plant and avoiding bioclogging
  • Subsurface wetland system capable of improving nitrogen and phosphorus removal effects of tail water in sewage plant and avoiding bioclogging

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Experimental program
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Effect test

Embodiment

[0022] Improve the effect of denitrification and dephosphorization of sewage treatment plant tail water and avoid biological clogging of subsurface flow wetland system, its structure and such as Figure 1-2 As shown, it includes the water distribution area 2, the purification area 3 and the water collection area 4 arranged in sequence, the water distribution area 2 is connected to the water inlet pipe 1, the water collection area 4 is connected to the water outlet pipe 5, between the water distribution area 2 and the purification area 3, and the purification area 3 and the catchment area 4 are provided with perforated flower walls 8 for evenly distributing the water flow.

[0023] Sulfur / limestone mixed matrix 31 , gravel matrix 32 and zeolite matrix 33 are placed sequentially in the purification zone 3 according to the direction of water flow from front to back. The volume ratio of sulfur / limestone mixed matrix 31 , gravel matrix 32 and zeolite matrix 33 is 1:1:1.

[0024] W...

Embodiment 2

[0031] The experimental site is the green land on the outlet side of a sewage treatment plant, and a subsurface flow wetland system is constructed to treat the effluent of the sewage treatment plant, with a treated water volume of 2000m 3 / d, the main pollutants are nitrate, ammonia nitrogen and total phosphorus. The content of nitrate nitrogen in the influent was determined to be 6-10mg / L, the content of ammonia nitrogen was 0.3-5mg / L, and the content of total phosphorus was 0.32-0.48g / L. The design hydraulic retention time of the subsurface wetland is 12 hours, and the hydraulic retention time of the three sections are all set to 4 hours. Set up 2 groups of subsurface flow wetlands, the plane size of each group is 10x51m, and the depth is 1m;

[0032]Sulfur / limestone mixed matrix area, gravel matrix area and zeolite matrix area are set in subsurface wetland in stages, and perforated aeration tubes are set in the gravel medium area. The particle diameter of the sulfur / limes...

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Abstract

The invention relates to a subsurface wetland system capable of improving nitrogen and phosphorus removal effects of tail water in sewage plant and avoiding bioclogging. The subsurface wetland system comprises a water distribution zone, a purifying zone and a water collection zone which are sequentially arranged, wherein the water distribution zone is connected with a water inlet pipe, the water collection zone is connected with a water outlet pipe and a sulfur / limestone mixed matrix, a gravel matrix and zeolite matrix are sequentially arranged inside the purifying zone according to the water flowing direction from front to rear. Compared with the prior art, the subsurface wetland is combined with sulfur autotrophic denitrification to remove nitrate in the influent water; since thiobacillus denitrificans slowly grows and the proliferation rate of thiobacillus denitrificans is far lower than that of heterotrophic bacteria, when efficient denitrification nitrogen removal is performed in the subsurface wetland system, the clogging of the subsurface wetland system due to the mass proliferation of microbes cannot be caused and meanwhile, limestone in the mixed matrix is adopted to achieve the removal of phosphates in the influent water.

Description

technical field [0001] The invention belongs to the technical field of ecological treatment of tail water of sewage plants, and in particular relates to a wetland system for improving the denitrification and phosphorus removal effect of tail water of sewage plants and avoiding biological clogging of underflow wetlands. Background technique [0002] According to the "2012 National Economic and Social Development Statistical Bulletin" ] It shows that by the end of 2012, the daily treatment capacity of my country's urban sewage treatment plants had reached 112.55 million cubic meters, and the urban sewage treatment rate had reached 82.6%. It can be seen that the amount of sewage that needs to be treated every year is very huge. According to my country's "Discharge Standards for Urban Sewage Treatment Plants" (GB18989-2002), the first-level A standard shows: the discharge standards for total nitrogen and total phosphorus are 15 mg / L and 0.5 mg / L respectively, while the "Environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F3/30C02F3/34
CPCC02F3/30C02F3/305C02F3/327C02F3/34C02F3/345C02F2101/105C02F2103/001C02F2203/004C02F2305/023C02F2305/04Y02W10/10
Inventor 何圣兵戴谨微费翔周伟丽黄荣振陈雪初高建文
Owner SHANGHAI JIAO TONG UNIV
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