Artificial paddy wetland system and method for controlling the non-point source pollution of paddy field

Abstract

The invention belongs to the technical field of non-point source pollution control, and discloses a method for controlling the non-point source pollution of paddy field, artificial paddy wetland system, and a paddy field wetland system for improving the P and N utilization rate of paddy field. The system structure uses the paddy field as the upper stream, and a paddy field wetland is constructed in the drainage downstream of the paddy field along the river. The surface of the paddy field wetland soil is 25-32cm lower than surface of the paddy field soil, and the area of the paddy field wetland is 3%-5% of the paddy field; the paddy filed wetland and paddy field are separated by the isolation ridge; paddy field ridges are around the paddy field, and paddy field wetland ridges are around the paddy field wetland; an irrigation ditch is arranged along one side of the paddy field and the paddy field wetland, and a drainage ditch is arranged on the other side. The method uses the paddy field to block, absorb and utilize the pollutant substances in the water, in order to reduce the pollutant substances in the output water; the paddy rice planted in the paddy field wetland uses the N, P and other elements in the drain away water from upstream paddy field as the source of nutrients, so as to increase the utilization rate of N and P in the paddy field.

Description

technical field [0001] The invention belongs to the technical field of non-point source pollution control, and particularly relates to a paddy field wetland system for controlling non-point source pollution of paddy fields and improving the utilization rate of N and P in paddy fields, and is suitable for areas where N and P are easily lost. Background technique [0002] Constructed wetland technology is widely used in my country because of its low investment, low energy consumption, and low treatment cost. However, traditional constructed wetland systems are commonly used in the treatment of sewage with high COD, BOD and SS values. For example, CN104261635A discloses a constructed wetland for efficient purification of domestic sewage. CN104291445A discloses a plant carbon source heterotrophic-sulfur autotrophic polytrophic denitrification artificial wetland for sewage treatment with a high proportion of NOX and a low C / N ratio. CN104211262A discloses a sewage ecological tre...

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Problems solved by technology

CN103708624A discloses a constructed wetland system aimed at problems such as insufficient oxygen supply and low purification efficiency in the prior art of sewage treatment

[0003] However, almost all constructed wetland systems include inlet and outlet water treatment devices and stabilization ponds, which are not the most suitable choice for the control of non-point source pollution in farmland where the loss of nutrients such as N and P is the main source.

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