Farmland sewage drainage and purification device

Abstract

The invention discloses a farmland sewage drainage and purification device. The device includes a pipe I, a pipe II and a pipe III connected sequentially in the direction of water flow. The diameter of the pipe II is larger than the diameter of the pipe I and the diameter of the pipe III. The pipe I is internally and sequentially provided with a filter layer cake and a flow control plate in the direction of water flow, and the pipe II is internally and sequentially provided with a pseudo grass string unit and a ball string unit in the direction of water flow, and the pipe III is internally provided with a PRB cake. The device can be buried in an outlet of a drainage ditch or in a ridge without affecting normal agricultural activities and has three-stage treatment effects of physical treatment, biological treatment and advanced treatment, so that farmland sewage can be purified to a certain extent before being discharged into a water body.

Description

technical field [0001] The invention belongs to the technical field of agricultural water pollution control, and in particular relates to a farmland drainage purification device. Background technique [0002] In agricultural production, some chemical fertilizers enter water bodies through surface runoff or soil infiltration along with farmland drainage, which can easily cause N and P eutrophication in water bodies. Farmland drainage is non-point source pollution, which has gradually attracted attention, and research on non-point source pollution caused by chemical fertilizers, pesticides, and soil erosion has become more active. It is an inevitable trend to take certain methods and measures to reduce the pollution of agricultural drainage to water bodies. [0003] Many related patents have provided great help. For example, the Chinese patent "A Method for Pollution Control and Emission Reduction of Farmland Drainage" with the patent number of 201210456740.7 is mainly to pl...

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Problems solved by technology

For example, the Chinese patent "A Method for Pollution Control and Emission Reduction of Farmland Drainage" with the patent number of 201210456740.7 is mainly to plant aquatic plants in the revetment and ditch to remove N and P in the water. High requirements, difficult plant growth management, a large number of growing plants will also lead to poor drainage, and when the plants wither and die in autumn and winter, nutrients such as N and P will be released again, causing secondary pollution and a series of problems; the patent number is The Chinese patent of 201110036371.1 "A Method for Constructing an Ecological Purification System of Farmland Drainage" This patent involves an ecological buffer area, which takes up a large amount of cultivated land resources, which is a major disadvantage; The Pollution Control Method of Farmland Drainage in Net Areas" is mainly to preliminarily sort out the drainage ditches to make ecological drainage ditches, and then reinforce the ecological drainage ditches with stone slabs or porous permeable panels. Obviously, this patented infrastructure project is relatively complicated. On-site It is not convenient to install, and it is also difficult to manage

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