Artificial wetland treatment system for tail water of sewage treatment plant

Abstract

The invention provides an artificial wetland treatment system for tail water of a sewage treatment plant. The artificial wetland treatment system at least comprises a shallow water multi-stage water falling channel, an artificial combination unit wetland, an underflow wetland and a biological stabilizing pond; the shallow water multi-stage water falling channel comprises a water channel and a multi-stage water falling dam; the artificial combination unit wetland comprises an aerobic nitrification area, an anoxic denitrification area and a settling area; the underflow wetland comprises a waterinlet channel, a microbial reaction area, wetland plants and a water outlet channel; the biological stabilizing pond is provided with an aquatic plant system and an aquatic animal system; sewage sequentially passes through the shallow water multi-stage water falling channel, the artificial combination unit wetland, the underflow wetland and the biological stabilizing pond sequentially; dwarf vallisneria longipedunculata and emergent aquatic plants are planted in the shallow water multi-stage water falling channel; a plurality of microbial growth based units are arranged in the aerobic nitrification area and the anoxic denitrification area of the artificial combination unit wetland at intervals; and the microbial reaction area of the underflow wetland consists of limestone, volcanic and gravel from top to bottom, and the grain size is from small to big.

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...

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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 organic matter and the nitrification of ammonia nitrogen. , the wetland does not have enough carbon sources to realize the denitrification reaction of nitrogen, the wetland treatment efficiency will drop significantly, it cannot effectively purify the pollutants, the effluent quality cannot be stably up to the standard, and the wetland is also difficult to achieve the treatment effect of the tail water of the sewage plant Surface Class IV standard;

[0007] (3) The treatment efficiency of traditional wetlands is reduced due to the withering and decay of plants in autumn and winter, and the decay of plants may lead to the re-release of pollutants

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