Purification method of drainage outside rice field in estuarine area

Abstract

The invention belongs to the technical fields of surface source pollution control and water pollution biological treatment and particularly discloses a purification method of drainage outside a rice field in an estuarine area. Emergent plants are planted at bottoms of drainage trenches of the rice field; floating plants are planted on trench walls; the drainage outside the rice field passes through the drainage trenches and the trench walls in sequence and then flows to a nitrogen and phosphorus prevention and control box and a plant floating bed which are arranged on rice field drainage main canals so as to be treated; and then the drainage outside the rice field is introduced to a natural wet land so as to be purified and converged to rivers. By using the purification method, the traditional conditions are fully utilized, a large amount of land is not occupied, needed materials are easy to obtain, retaining effects to nitrogen and phosphorus are good, and meanwhile, a scenery effect is good.

Description

technical field [0001] The invention belongs to the technical field of non-point source pollution control and biological treatment of water pollution, and specifically relates to a method for purifying drainage from paddy fields in an estuary area. Background technique [0002] Hekou District is an important rice production area and high-quality rice production base in the country. It has the largest contiguous area of ​​rice fields in the country of 105,000 hectares, with an annual output of 980,000 tons of rice. However, due to the dense river network in the estuary area, the nitrogen and phosphorus produced in the rice production process can enter the surface water system of the river network through leaching and runoff. It is estimated that the annual discharge of nitrogen is 3185 tons, and the annual discharge of phosphorus is 41.2 tons. Driven by the complex hydraulic transport mechanism of the river network, these pollutants eventually flow into the river, seriously a...

AI Technical Summary

Problems solved by technology

Therefore, after the existing foreign technologies are applied to my country's farmland, there are problems such as excessive reduction in yield, excessive use of farmland, and high cost, and are not completely suitable for fertilizer pollution control in rice fields in my country.

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