Artificial wetland treatment system for tail water of sewage treatment plant

Abstract

The invention provides a tail water artificial wetland treatment system of a sewage treatment plant, which at least includes a shallow multi-stage drop channel, an artificial combined unit wetland, an underflow wetland and a biological stabilization pond; the shallow multi-stage drop channel includes a water channel and a multi-stage drop dam , the artificial combined unit wetland includes an aerobic nitrification area, anoxic denitrification area and a sedimentation area, the subsurface flow wetland includes an inlet channel, a microbial reaction area, wetland plants and an outlet channel, and the biological stabilization pond is provided with an aquatic plant system and the aquatic animal system, the sewage sequentially passes through the shallow multi-level drop channel, the artificial combined unit wetland, the subsurface wetland and the bio-stabilization pond, and the dwarf evergreen bitter grass and emergent plants are planted in the shallow multi-level drop channel, and the The aerobic nitrification area and the anoxic denitrification area of ​​the artificial combined unit wetland are arranged with several microbial growth base units at intervals. The microbial reaction area of ​​the subsurface wetland is limestone, volcanic rock and gravel from top to bottom with particle sizes ranging from small to large.

Description

technical field [0001] The invention relates to the field of water pollution control, in particular to an artificial wetland treatment system used for tail water treatment of sewage treatment plants. Background technique [0002] The direct discharge of the tail water of the sewage treatment plant into the nearby water body will not only cause harm to the quality of the regional water environment, but also directly threaten the living environment of the people. After the construction of the tail water advanced treatment project is implemented, it is of great significance to reduce the pressure on the supply and demand of tap water in the agglomeration area and improve the quality of life of the people. [0003] The purification of pollutants in the traditional constructed wetland system is mainly degraded by the good purification effect of the stable ecosystem composed of soil, microorganisms and plants, and provided by the biofilm growing on the surface of the filler, enric...

AI Technical Summary

Problems solved by technology

[0005] (1) The load of traditional wetlands is small, the residence time is short, most of them are about 3-5 days, and the area is large;

[0006] (2) The treatment efficiency of traditional wetlands is low. The oxygen source in the wetlands is mainly through the photosynthesis of plants and the transport of roots or through the drop flow of water level height difference to enrich oxygen. Under the premise of time, the corresponding treatment effect can be achieved; when the temperature is low in autumn and winter, due to the withering of plants and the reduction of microbial activity, dissolved oxygen is often not enough to meet the oxidation of

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