Improved surface flow artificial wetland for treating overland runoff pollutants of farmland

Abstract

The invention relates to a surface flow artificial wetland and particularly discloses an improved surface flow artificial wetland for treating overland runoff pollutants of a farmland. The improved surface flow artificial wetland comprises a plant absorbing region and a final-settling water collecting region, wherein a water permeable wall is arranged between the final-settling water collecting region and the plant absorbing region; and the final-settling water collecting region is provided with a water inlet channel, and an openable overflow channel is communicated to the water inlet channel. The improved surface flow artificial wetland for treating the overland runoff pollutants of the farmland has the advantages that (1) the occupied area of the improved surface flow artificial wetland is reduced, and the dependence of the constructed wetland on a terrain is greatly reduced; (2) the problem that the removal rate of the pollutants is instable due to space-time non-uniformity of rainfall is solved; and (3) suspended pollutants such as silt are intensively deposited in the final-settling water collecting region, so that the silt of the whole artificial wetland does not need to be frequently removed, and the maintenance cost is greatly lowered.

Description

technical field [0001] The invention relates to a constructed wetland, in particular to a surface flow constructed wetland. Background technique [0002] At present, in addition to source control technologies such as planting system optimization, scientific fertilization, pesticide reduction, and residue control, technologies for non-point source pollution in farmland also include ecological field ridges, ecological interception belts, ecological interception ditches, front Storage technology, artificial wetland technology. [0003] The ecological field ridge is to increase the height of the existing field ridge by 10-15cm, which can effectively prevent surface runoff during 30-50mm rainfall, or reduce irrigation water in the early stage of fertilization to reduce the depth of surface water, thereby reducing most of the farmland surface runoff. Plants can be planted on both sides of the field ridge to form an isolation zone, which can effectively block the loss of nitrogen ...

AI Technical Summary

Problems solved by technology

[0013] In order to solve the problems in the prior art that the improved surface flow constructed wetland for treating farmland surface runoff pollutants occupies a large area, is difficult to desilt and maintain, and has unstable pollutant removal effects, the present invention provides a method for treating farmland surface runoff pollutants Improved Surface Flow Constructed Wetlands

[0015] In order to solve the problem that the surface flow artificial wetland occupies a large area and the treatment effect is unstable, the inventor proposes: if the shortcomings of large instantaneous flow of surface runoff, short collection time, and intermittent treatment of incoming water can be transformed into small flow, incoming water The continuous and stable characteristics can ensure that the surface runoff has enough residence time in the wetland, so that the plants can fully absorb the nitrogen and phosphorus components in the surface runoff, and the organic matter is effectively degraded, so the area occupied by the governance system can be greatly reduced.

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