Small-watershed water body non-point source pollution recovery and control system and construction method thereof

Abstract

The invention provides a small-watershed water body non-point source pollution recovery and control system and a construction method thereof. The small-watershed water body non-point source pollutionrecovery and control system comprises a water retaining dam for intercepting divided river water, a silt sedimentation pond for settling silt in the river water, a planting and breeding pond for purifying the water and obtaining economic benefits, and a constructed wetland. The water retaining dam is used for intercepting the divided water flow, the silt sedimentation pond, the planting and breeding pond and the constructed wetland are arranged in the water flow direction in sequence, aquatic plants are planted in the planting and breeding pond, and / or aquatic animals are bred in the plantingand breeding pond. According to the rural small-watershed water body non-point source pollution recovery and control system, through overall planning, a planting structure is adjusted; through physical, chemical and biological treatment, the hazards of pollutants to the environment are removed, nutrient substance in the pollutants is fully utilized, economic benefits are obtained, and an all-win effect is achieved.

Description

technical field

[0001] The invention belongs to the field of river engineering, and in particular relates to a treatment method for water bodies in small watersheds. Background technique

[0002] Rural non-point source pollution refers to dissolved or solid pollutants in rural life and agricultural production activities, such as organic or inorganic substances such as soil particles, nitrogen, phosphorus, pesticide heavy metals, rural poultry manure and domestic garbage in farmland , from a non-specific area, under the action of precipitation and runoff erosion, through farmland surface runoff, farmland drainage and underground seepage, a large amount of pollutants enter the receiving water body (rivers, lakes, reservoirs, bays) caused by pollution. The COD, total N, and total P of organic matter produced by rural non-point sources are the main sources of pollutant load, and rural domestic sewage, rural solid waste, farmland pesticides and fertilizers, soil erosion and storm...

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