Method for treating surface source pollutants in ecological ditch

Abstract

The invention discloses a method for treating nitrogen and phosphorus surface source pollutants in an ecological ditch. The method comprises the following steps of: A, constructing the ecological ditch: constructing the ecological ditch at the exit of a catchment area, and dividing the ecological ditch into multiple steps, wherein the slope and the bottom of the ditch are made of soil, and a water blocking bank has a brick-concrete structure; B, planting aquatic plants and breeding loaches section by section: planting the aquatic plants in the ecological ditch to digest the nitrogen and phosphorus surface source pollutants in a water body by using the intercepting and absorbing effect of the aquatic plants, and breeding the loaches on the lower middle part of the ecological ditch to increase economic benefits of the ecological ditch; C, managing the ecological ditch: periodically reaping the aquatic plants, dredging the ecological ditch in combination with harvesting of the loaches, and newly planting aquatic plants and breeding loaches; and D, managing and maintaining the ecological ditch: 1) reaping and utilizing the plants in the ditch, 2) dredging, and 3) maintaining the ecological ditch. The method is low in cost and easy to operate, is easily accepted by crowds, has an extremely good treatment effect on the nitrogen and phosphorus surface source pollutants, and has a very good popularization and application prospect in subtropical hilly regions of middle and lower reaches of the Yangtze River.

Description

technical field [0001] The present invention relates to the field of agricultural environment, and more specifically relates to a treatment method for non-point source pollutants in the downstream of small catchment areas distributed with farmland and small-scale farmers, especially suitable for the treatment of non-point source pollution in subtropical hilly areas south of the Yangtze River. Water quality improvement and standard discharge. Background technique [0002] With the increase in the input of chemical fertilizers in the planting industry and the rapid development of the small-scale breeding industry, the environmental problems caused by the discharge of agricultural non-point source pollutants in the vast rural areas have become increasingly prominent. According to the results of the 2010 National Survey of Pollution Sources, the annual discharge of major water pollutants from agricultural sources in my country is: 13.2409 million tons of chemical oxygen demand (...

AI Technical Summary

Problems solved by technology

Although the local governments of several large lakes and their surrounding areas in China have spent a lot of manpower and material resources to control eutrophication with engineering measures, they will return to the original state after 1-2 years. The overall control effect is not good. The main reason is The source of pollutants has not been effectively controlled

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