Drainage channel overflow weir for reducing agricultural non-point source pollution

Abstract

The invention discloses a drainage channel overflow weir for reducing the agricultural non-point source pollution. The overflow weir consists of a sandstone filtering layer, a combined sewage ecological purification device and a permeable concrete weir. The combined sewage ecological purification device is arranged between the sandstone filtering layer and the permeable concrete weir. The combined sewage ecological purification device consists of a biological filter bed and a fixing algae reaction tank. The sandstone filtering layer is arranged at the head end of a water facing surface of the overflow weir. The overflow weir is arranged in an overflow cross section of a drainage channel. The height of the overflow weir is equal to the daily water level elevation of the drainage channel. The drainage channel overflow weir is scientific and simple, is easy to implement. The overflow weir is arranged in the drainage channel, so that the drainage channel overflow weir has the effects of stopping flowing water, slowing down the flow rate, precipitating suspended matter in the water, removing substances such as nitrogen, phosphorus and the like in agricultural drained water and increasing the dissolved oxygen concentration of a water body. A purifying material has low cost and is easy to obtain. A purification facility is convenient to maintain and manage. The purifying effect on the polluted water is ensured to a certain extent, so that the agricultural non-point source pollution can be well reduced, and the water quality of the rivers and the lakes in the rural areas is improved.

Description

technical field [0001] The invention relates to a structure in which an agricultural non-point source polluted water purification device is arranged in a farmland drainage ditch, so that the farmland drainage polluted by the agricultural non-point source can be purified before flowing into lakes and rivers, and belongs to the technical field of farmland water conservancy engineering. Background technique [0002] Since the reform and opening up, China's agricultural development has achieved world-renowned achievements. With less than 10% of the world's arable land, it has basically solved the problem of feeding 22% of the world's population. In the process of developing agriculture, the use of chemical fertilizers and pesticides has played an important role in increasing grain production. However, in many areas, due to unreasonable use, a considerable degree of agricultural non-point source pollution has been caused. Agricultural non-point source pollution has accounted for ...

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Problems solved by technology

How to purify the farmland drainage polluted by agricultural non-point sources before flowing into lakes and rivers, so as to reduce agricultural non-point source pollution, has always been a problem that agricultural production, scientific research departments and environmental protection departments want to solve, but have not found a good way to solve it

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