Artificial mangrove wetland system for deep treatment of sewage

Abstract

The invention provides an artificial mangrove wetland system for deep treatment of sewage, and the artificial mangrove wetland system comprises a sedimentation tank, a horizontal subsurface flow wetland bed, an oxygen-increasing wetland bed, a vertical flow wetland bed and a horizontal surface flow wetland bed which are sequentially connected. The sedimentation tank is filled with nano silica gravel. The bottoms of the horizontal subsurface flow wetland bed and the vertical flow wetland bed are both provided with a filler layer and a sea sand layer, the filler layer comprises a nano-silica gravel layer, the sea sand layer is positioned above the nano-silica gravel layer, and mangrove plants are planted in the horizontal subsurface flow wetland bed and the vertical flow wetland bed. The wall of the oxygen-increasing wetland bed is a honeycomb-shaped rough surface, and the honeycomb-shaped rough surface is provided with gravel blocks containing nano silicon oxide. An S-shaped dam is arranged in the horizontal surface flow wetland bed. By adopting the artificial mangrove wetland system, the removal efficiency of pollutants such as nitrogen and phosphorus in a water body is increased,the removal efficiency of the nitrogen and the phosphorus and the degradation efficiency of toxic and harmful substances are further improved, and the deep purification efficiency of the sewage is ensured.

Description

technical field [0001] The invention belongs to the technical fields of ecological restoration, environmental protection engineering and sewage treatment, and in particular relates to an artificial mangrove wetland system for deep treatment of sewage. Background technique [0002] At present, urban sewage is collected by pipelines, concentrated in sewage treatment plants and then directly discharged into nearby rivers after being purified, and then discharged into the ocean after being collected by rivers. According to the national comprehensive sewage discharge standard, even if the tail water standard reaches the highest level (Class A standard), the total nitrogen content in it is still higher than 15mg.L -1 , Moreover, because the effluent standard does not clearly stipulate the content of other harmful trace elements and pathogenic microorganisms, a large amount of tail water directly flows into the sea from the river, which is likely to cause disease and death of sensi...

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Problems solved by technology

[0005] However, most of the current tail water flows directly into the river or offshore, and there is a lack of biological deep purification steps in the middle. On the one hand, the toxic and harmful substances in the tail water may endanger the coastal ecosystem (including native mangrove vegetation) and destroy the ecological balance. The functions of mangroves in pollution purification and offshore ecological balance maintenance have not been fully utilized

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