Drainage basin ditch water pollutant intercepting and purifying method

Abstract

The invention belongs to the technical field of agricultural non-point source pollution, and particularly relates to a drainage basin ditch water pollutant intercepting and purifying method which comprises the following steps: (1) constructing an ecological ditch; (2) planting plants: planting creeping plants capable of purifying water on the soil covering strips; planting herbaceous plants capable of absorbing nitrogen and phosphorus pollutants in the planting areas, wherein the herbaceous plants comprise bermuda grass, vetiver grass and pennisetum purpureum, one kind of herbaceous plants is planted in each planting area, and the varieties of the herbaceous plants in the adjacent planting areas are different. According to the method, the farmland in the drainage basin serves as a source, stepped interception is conducted through the timber pile fences on the two sides of the ditch and the plants planted on the ditch bottom partition sections, nitrogen and phosphorus pollutants lost in the farmland are absorbed, intercepted and adsorbed by the plants planted in the ditch, and the effect that the nitrogen and phosphorus pollutants in the ditch water are reduced from the source and utilized to reduce water pollution is achieved.

Description

technical field [0001] The invention belongs to the technical field of agricultural non-point source pollution, and in particular relates to a method for intercepting and purifying water pollutants in river basins and ditches. Background technique [0002] Agricultural non-point source pollution is one of the most widely distributed and important pollutions. Nitrogen and phosphorus in the agricultural planting process enter the receiving water body adjacent to the farmland through farmland infiltration, surface runoff, diffusion, and farmland drainage, making the regional receiving water body Eutrophication poses a serious threat to water quality and ecosystems. [0003] As the drainage system of farmland, ditches are not only the "regulators" of farmland water, but also the transition zone between farmland, rivers and lakes. They have the functions of farmland drainage and ecological wetlands, and not only play the role of flood drainage and waterlogging prevention, It can...

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Problems solved by technology

[0004] At present, most of the patents related to the control of agricultural non-point source pollution by ecological ditches focus on the preparation of ecological concrete, concrete slabs, laying various types of ecological bricks or cement boards in ditches, placing external pollution interceptors, and building cement sand in ditches as a whole. Filling with stone walls, zeolite, ceramsite, etc., planting absorbent aquatic plants and algae plants in ecological ditches, etc. Although these methods have achieved a certain interception effect on pollutants, they are expensive, cumbersome, easy to block, and consume consumables. Power, difficult to operate and manage

[0005] In addition, there are vegetation buffer strips, vegetation filter strips, ecological ponds, artificial wetlands and other purification measures to control agricultural non-point source pollution. However, the above methods have certain limitations and occupy too large an area, making it difficult to promote them on a large scale. It cannot be applied to agricultural areas on the watershed scale in mountains, hills and sloping cultivated land with poor soil water storage capacity.

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