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

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...

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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

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