Pollution control and emission reduction method for farmland drainage

Abstract

The invention discloses a pollution control and emission reduction method for farmland drainage. The pollution control and emission reduction method comprises the following steps: arranging a drainage ditch on the drainage side of the farmland, arranging a solidifying protective slope on the side slope of the drainage ditch, planting hygrophyte on the protective slope, and arranging submerged alga plants inside the drainage ditch; arranging water level control gates inside the drainage ditch in a segmented way and controlling the height of the water level of each segment inside the drainage ditch according to the field elevation change status; connecting a drainage river way at the downstream of the drainage ditch, and arranging a flow division control valve at the connected part of the drainage ditch and the drainage river way, wherein the flow division control valve comprises a water inlet, an overflow port and a water permeation hole, wherein a water permeation tube is connected to the water permeation hole; and the water permeation tube is embedded inside the bank slope of the drainage river way. Compared with the prior art, the pollution control and emission reduction method for farmland drainage effective retains and purify the draining water of the farmland, so that on one hand, the effect of precipitation is exerted and the planted hygrophyte can also sufficiently absorb nitrogen and phosphorus contaminant ions in the water, and on other hand, the rice can use part of underground water due to elevation of the underground water level to improve the utilization efficiency of the water.

Description

Technical field [0001] The present invention belongs to the field of farmland drainage and facial source pollutants, which involves a design method for controlling the separation of daily drainage and waterlogging and drainage, cutting farmland drainage and its output of facial source pollutants. Background technique [0002] Agricultural face source pollution is one of the main sources of water quality damage. The U.S. Environmental Protection Agency has listed agriculture as the first source of pollution for rivers and lakes in the United States, migration of pesticides and fertilizers in the soil, and its pollution to soil and water body pollution.Waiting for a worldwide serious ecology and environmental issue.Taihu Basin is one of the most developed areas of my country's socio -economic.Since the 1960s, with the rapid development of the economy, the water pollution of Taihu Lake has increased significantly, and the water environment has deteriorated.At present, 70%of the rive...

AI Technical Summary

Problems solved by technology

At present, the amount of fertilizer applied in the area around Taihu Lake is as high as 400-600kg / hm 2 , far exceeding the reasonable amount of fertilizer application, and due to reasons such as unreasonable management of farmland irrigation and drainage, the fertilizer utilization rate is less than 15%.

In my country, according to the characteristics of different irrigation areas, a group of scholars began to study the technology of open ditch control drainage. Although some water level control facilities at the outlet of drainage ditch have been proposed, in the actual application process, these have not yet formed a specific design method, and the means of controlling drainage facilities are still unknown. Relatively simple, some technical applications in the field of water ecology and water environment restoration have not yet begun

Images