Multi-stage stabilization pond-constructed wetland combined system

Abstract

The invention discloses a multistage stabilization pond-constructed wetland combined system which comprises a water inlet, a water outlet and a sewage treatment structure arranged between the water inlet and the water outlet, the sewage treatment structure is an integral pond body, the pond body is divided into a plurality of branch pond bodies, and anti-seepage cloth is arranged at the bottoms and the side walls of the pond body and the branch pond bodies; the plurality of sub-pond bodies comprise n stages of constructed wetland units and n-1 stages of stabilization pond units, and n is greater than or equal to 2; wherein the water inlet is communicated with the first-stage constructed wetland unit, the water outlet is communicated with the nth-stage constructed wetland unit, the constructed wetland units and the stabilization pond units are alternately connected, and sewage is alternately treated between the adjacent communicated sub-pond bodies in an ascending underflow mode and a descending underflow mode respectively. The system disclosed by the invention not only can better resist hydraulic impact load, but also is higher in removal rate of BOD, COD, TN and TP in water flowing through the system, low in effluent bacteria and algae concentration and more stable in water quality, and only needs shorter hydraulic retention time.

Description

technical field [0001] The invention relates to a sewage treatment system, in particular to a multi-stage stabilization pond-artificial wetland combined system. Background technique [0002] At present, my country is actively carrying out the construction of domestic sewage treatment facilities and supporting sewage collection pipe networks in agglomerated areas including rural areas, so as to effectively control the pollution of rural water environment. However, some areas are relatively scattered, which is not conducive to the construction of pipeline networks, and is prone to the problem of inadequate control of water environmental pollution. Therefore, there is an urgent need for a treatment system with low construction costs, low operating costs, convenient management and maintenance, and good treatment effects and ecological landscape effects. Common ecological sewage treatment processes include constructed wetlands, soil infiltration, oxidation ponds, etc. However, d...

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Problems solved by technology

[0003] The general multi-level stable pond-constructed wetland combination system is likely to cause the pond body to be too long and occupy a large area, resulting in difficult site selection and low land use efficiency.

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