Efficient composite wetland system for reducing rainfall runoff pollutants

Abstract

The invention provides an efficient composite wetland system for reducing rainfall runoff pollutants. The efficient composite wetland system comprises a settling zone, a surface flow wetland, a deep purification unit and a water collecting well. Large-particle impurities such as silt in rainfall runoff are settled in the settling zone so as to reduce blockage of a wetland filler. The surface flow wetland plays a role of hydraulic regulation through a winding up-and-down shape, and a certain landscape water surface is formed, when rainwater flows, organic pollutants in water are removed through submerged plants and the like; ammonia nitrogen and phosphorus in the water are removed through the deep purification unit, and the fully purified rainwater is discharged through a gate on the water collecting well. The liquid level is controlled through a water level control device, rainfall runoff can stay in the wetland system for a long time, the purpose of sufficient purification is achieved, the water level of the wetland system can be adjusted according to needs, and the problems that an existing traditional constructed wetland is poor in decontamination effect and low in decontamination efficiency due to the fact that no water level control function exists are solved.

Description

technical field [0001] The invention relates to the technical field of constructed wetlands, in particular to an efficient composite wetland system for reducing rainfall runoff pollutants. Background technique [0002] Generally speaking, water pollution sources are divided into two categories: point source pollution and non-point source pollution, which are controlled by different treatment methods. Point source pollution has a clear discharge point (such as domestic sewage and industrial wastewater discharged from residential areas or industries), which can be easily collected through the pipe network and sent to the sewage treatment plant for treatment. The non-point source pollution has a large distribution range, including pollutants that have been deposited in farmland planting areas, land, grassland, forest land, construction sites, and roads. The runoff enters the natural water body, which is difficult to treat and control. Common treatment methods used to reduce n...

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Problems solved by technology

[0004] Aiming at the above-mentioned problems in the prior art, the present invention provides a high-efficiency composite wetland system for reducing rainfall runoff pollutants, which solves the problem of poor decontamination effect and decontamination caused by the lack of water level control function of existing traditional constructed wetlands. The problem of low pollution efficiency

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