Horizontal subsurface wetland system for intensifying denitrification of micro-polluted water in winter

Abstract

The invention relates to a horizontal subsurface wetland system for intensifying denitrification of micro-polluted water in winter, which effectively solves the problem that the denitrification effect of the wetland in winter is affected by low BOD5/NO<3->, dissolved oxygen, substrate clogging and the like. The method comprises the following steps: forming a water distributing room between a water distributing plate which is arranged on the inner face at the water inlet end of a substrate bed body and an inner face at the water inlet end; forming a water receiving room between a water receiving plate which is arranged on the inner face at the water outlet end and the inner face at the water outlet end; arranging a plurality of sampling tubes at the front and middle sections in the substrate bed body between the water distributing plate and the water receiving plate; forming ventilating holes in each sampling tube; arranging a corncob layer at the rear section in the substrate bed body; forming limber holes in the water distributing plate and the water receiving plate, wherein the substrate bed body between the water distributing plate and the water receiving plate is internally filled with a gravel layer, a zeolite layer and a gravel scrap iron layer from top to bottom; installing a water inlet pipe on the end face at the water inlet end of the substrate bed body; installing a water outlet pipe used for adjusting the water level on the end face at the water outlet end; and covering the surface of the wetland system with a thin film. The system provided by the invention is simple to maintain, low in substrate clogging frequency and low in operating cost, and the denitrification percent is not less than 40%.

Description

technical field [0001] The invention relates to a sewage treatment system, in particular to a horizontal subsurface flow wetland system that strengthens denitrification of slightly polluted water bodies in winter. Background technique [0002] Pollution of water sources is a common problem in the world, especially my country is one of the countries with serious shortage of water resources in the world. The per capita water resources are small, but the water pollution is very serious. In recent years, due to the continuous strengthening of the construction of sewage treatment plants, the problem of direct sewage discharge has been curbed to a certain extent. However, even if the sewage treatment plants implement the most stringent discharge standards, there is still a certain gap between the effluent indicators and the surface water environmental quality standards. As the receiving water body of various treated wastewater, rivers are often polluted by organic matter and nitro...

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Problems solved by technology

[0006] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a horizontal subsurface flow wetland system that strengthens the denitrification of slightly polluted water in winter, which can effectively solve the problem of low BOD 5 / NO 3 - , dissolved oxygen, substrate clogging and other issues that affect the denitrification effect of wetlands in winter

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