Compound constructed wetland tail water treatment system

Abstract

The invention discloses a compound constructed wetland tail water treatment system, which belongs to the field of sewage treatment technology. The system mainly includes a pretreatment and a constructed wetland system. The pretreatment portion comprises an aeration oxidation pool and an ecological gravel bed; The constructed wetland system fuses a design of stabilization lagoon, which combines a vertical current constructed wetland and a surface flow constructed wetland, and a stabilization lagoon is arranged in step in series; the tail water to be treated passes the aeration oxidation pool, the ecological gravel bed, the vertical current constructed wetland, the stabilization lagoon in order, and finally passes the surface flow constructed wetland and flows out. The system combines physical, chemical and biological means organically, thereby effectively improving the tail water quality, and the water quality of water outlet basically reaches the surface water environment standard III grade, and the water outlet can directly returns to river ecological environment for supplementing water and can be used as city miscellaneous water; the invention has the advantages of low investment, simple operation, low energy consumption, high environment benefit and ecological benefit, etc.

Description

technical field [0001] The invention relates to a composite artificial wetland tail water treatment system, in particular to a tail water treatment system based on pretreatment-vertical flow-stabilizing pond-surface flow wetland, and belongs to the technical field of sewage treatment. Background technique [0002] With the growth of population and the rapid development of social economy, the discharge of industrial wastewater and domestic sewage is increasing day by day. In order to ensure the coordinated development of economic construction and environmental protection, a large number of sewage treatment plants have been built in various places to conduct centralized treatment of sewage and wastewater. Water is generally discharged directly into the body of water. The construction and operation of sewage treatment plants have reduced the pollution load of surface water to a certain extent, and effectively guaranteed the environmental quality and function of surface water. ...

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Problems solved by technology

Therefore, there are problems such as high investment, operation and maintenance costs, high energy consumption for system operation, and poor landscape effects in sewage treatment plants.

In general, the investment and operating costs of sewage treatment plants are as high as 2 to 10 times that of biological-ecological treatment systems

[0007] The current constructed wetland technology mainly uses a single wetland as the main treatment unit, which is limited by factors such as large area, easy to be blocked, and the treatment effect is greatly affected by seasonal effects. High rural domestic sewage, the treatment scale is small, the application range is limited, and the treatment effect is not stable

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