Combined artificial wetland system and sewage treatment method thereof

Abstract

The invention discloses a combined artificial wetland system and a sewage treatment method thereof, belonging to the field of sewage treatment. A combined artificial wetland system, which includes successively connected three-level wetlands, that is, the first level adopts surface flow-subsurface flow composite flow wetlands, the second level adopts horizontal subsurface flow wetlands, and the third level adopts vertical subsurface flow wetlands; the surface flow - The subsurface composite flow wetland includes the first box, the horizontal underflow wetland includes the second box, and the vertical underflow wetland includes the third box. The first, second, and third boxes are all equipped with calcium-aluminum mixed filler layers. The type filler is made by mixing and firing aluminum-containing sludge and lime, the mass ratio of aluminum-containing sludge and lime is 1:1, and roasting at 600°C for 2 hours. The system and method of the present invention can efficiently remove CODCr, ammonia nitrogen, total nitrogen, total phosphorus and fluorine pollutants in the tail water, and the effluent indicators all reach Class IV of the Environmental Quality Standard for Surface Water (GB3838-2002).

Description

technical field [0001] The invention belongs to the field of sewage treatment, and more specifically relates to a combined subsurface flow constructed wetland system for treating tail water of a sewage treatment plant in a chemical industry park and a treatment method for waste water. Background technique [0002] According to the difference in the flow of sewage in the system, the sewage treatment system of constructed wetland can be divided into two types: surface flow (SFCW) and subsurface flow (SSFCW), and the latter is divided into two types: horizontal flow (HSSFCW) and vertical flow (VSSFCW). In the water mode, some of them design the water distribution mode as wave flow (WSSFCW). [0003] Effect of constructed wetland on BOD and COD Cr The removal rate of , SS and polluting bacteria can reach more than 90%, but the removal rate of nitrogen and phosphorus is low and unstable. At present, the main problem in the application of constructed wetlands is that it is diffi...

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Problems solved by technology

[0006] Aiming at the tail water quality and volume fluctuations, poor biodegradability and low BOD of the sewage treatment plant in the chemical industry park existing in the prior art 5 / N and other problems, the present invention provides a combined constructed wetland system and its sewage treatment method, which can efficiently remove COD in tail water Cr , ammonia nitrogen, total nitrogen, total phosphorus and fluorine pollutants, and the effluent indicators all meet the "surface water environmental quality standards" (GB3838-2002) category IV

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