Combined type multifunctional deep nitrogen and phosphorus removal artificial wetland system for tail water

Abstract

The invention discloses a combined type multifunctional deep nitrogen and phosphorus removal artificial wetland system for tail water. The system includes a hydrolyzed acidification zone (1), a biomass filling material placement zone (2), a denitrification wetland area (3), a nitrification wetland area (4), a denitrification wetland area (5) and an enhanced phosphorus removal zone (6). Tail waterenters the hydrolyzed acidification zone (1) to be in contact with a biofilm colonization combined filling material, so that the nitrogen and phosphorus elements in the tail water can be effectively utilized; the tail water enters the biomass filling material placement zone (2) through a diversion groove, and the filling material can release organic matters to provide favorable conditions for follow-up denitrification; the denitrification wetland area (3) and (5) adopt enclosed top covers which can provide anoxic environments for microorganisms; and the high calcium fly ash ceramsite and ferro-iron composite filling material in the enhanced phosphorus removal zone (6) can effectively remove phosphorus. The system can effectively solve the contradiction of the demands of the removing of phosphorus and nitrogen in tail water on carbon sources; the system is not easy to block, and is good in effluent water quality and less in investment; and effects of beautifying landscapes can be achieved by cooperatively planting water plants.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a combined multifunctional artificial wetland system for deep denitrification and dephosphorization of tail water. Background technique [0002] At present, the effluent water quality of my country's sewage treatment plants generally implements the first-class A or B standard in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002). However, due to the unreasonable sewage treatment process and treatment equipment in many urban sewage plants, the efficiency of sewage treatment is low, the energy consumption is high, and a large amount of tail water from sewage plants is directly discharged to receiving water bodies. Although most of the tail water of the sewage treatment plant can meet the discharge standard, it still has a lot of pollutants. Taking the third class water on the surface as an example, the concentration of the effluent from th...

AI Technical Summary

Problems solved by technology

However, the treatment efficiency of a single constructed wetland is not high, the treatment effect is unstable, and it is greatly affected by temperature

The organic content of pollutants in the tail water is relatively small, and the growth of microorganisms requires the use of carbon sources, so the constructed wetland as a tail water treatment unit often cannot fully exert its treatment capacity

[0004] The Chinese invention patent with the application number 201510680367.7 discloses a composite gravel bed for constructed wetlands. The composite gravel bed of the invention is composed of a growth matrix layer and a filler layer, and the removal rate of COD is higher than 50%, and the removal rate of total nitrogen and phosphorus is also average. It is more than 60%, but when the hydraulic load and impact load of the influent are large, a single composite gravel bed cannot meet the water quality requirements of the effluent

[0005] The Chinese invention patent with application number 201610419636.9 discloses a combined artificial subsurface flow wetland treatment system for enhanced nitrogen and phosphorus removal. The invention removes suspended pollutants in sewage through a screen, and uses microorganisms, plants, and substrates to absorb nitrogen and phosphorus. , but when the organic matter in the sewage influent is insufficient, it is difficult to carry out denitrification and denitrification, resulting in the deterioration of the effluent quality

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