Method for treating agricultural non-point source pollution in hilly areas

Abstract

The invention provides a systematic method for treating agricultural non-point source pollution in hilly areas. According to the systematic method, hilly uplands are reclaimed as counter-slope terrace lands, terrace lands per line are kept at equal height, and different lines of terrace lands are parallel mutually and are perpendicular to the inclination direction of upslope lands. The systematic method includes source reduction, runoff interception, process control and nutrient utilization, wherein source reduction refers to substitution for and reduction of chemical pesticides and chemical fertilizers; runoff interception is implemented by planting hedgerow on the external slope surfaces of the counter-slope terrace lands and planting land cover plants on the slope surfaces, dorsal furrows and terrace ridges; in process control, flood intercepting trenches, longitudinal drainage ditches and the dorsal furrows are formed and grit chambers, water-collecting wells and primary rainwater collecting devices are arranged to form a network; nutrient utilization is implemented by a pretreatment unit and a main treatment unit. The systematic method for treating the agricultural non-point source pollution in the hilly areas has the advantages that onsite terrain conditions are fully utilized, and corresponding ecological control and treatment methods are adopted in different forming phases of runoff and pollution, so that runoff nutrient cycling utilization efficiency is improved and production and discharge of the non-point source pollution are reduced.

Description

technical field [0001] The invention relates to the technical field of water pollution control, in particular to a method for controlling agricultural non-point source pollution in low mountain and hilly areas. Background technique [0002] Non-point source pollution is a serious environmental problem common in the world today. With the continuous development of intensive agriculture, agricultural non-point source pollution has become a prominent problem in agricultural development. Studies in developed countries such as the United States and the European Union have shown that agricultural activities are the largest source of non-point pollution. In our country, at present, agriculture has surpassed industry to become the largest non-point source polluting industry in our country. In recent years, China has used a large amount of chemical fertilizers and pesticides, ranking first in the world in both production and use; however, the utilization rate of chemical fertilizers ...

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Problems solved by technology

[0008] In view of this, the object of the present invention is to provide a method for controlling agricultural non-point source pollution that takes into account the benefits of both agricultural economy and ecological environment, so as to solve the eutrophication of rivers and lakes caused by the loss of agricultural non-point source nutrients along with surface runoff in low mountain and hilly areas in the south. question

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