Culture tail water recycling aquatic rice farming method

Abstract

The invention relates to a culture tail water recycling aquatic rice farming method, and belongs to the technical field of the treatment of culture wastewater. According to the culture tail water recycling aquatic rice farming method, wastewater from a culture pond is purified through a water-collecting well, a filter tank and a modifying pool, and then is reused again; the wastewater in a purification process can be used for carrying out the plantation of paddy rice; a solid particle in the wastewater is adsorbed and intercepted through a developed root system of the paddy rice; an aerobiotic / anoxic zone is formed at a root segment of the paddy rice to promote the reaction processes of nitrification and denitrification; by using the culture tail water recycling aquatic rice farming method, the characteristics that an aerated biological filter tank is high in the volumetric load of an organic matter, high in hydraulic load and short in hydraulic retention time, and the like, are combined; the investment, running and maintenance costs are relatively reduced; the purification effect on the wastewater is improved. According to the culture tail water recycling aquatic rice farming method, through introducing the wastewater from the culture pond into a planting tank, not only is the water quality purified, but also a nutrient substance is provided for the growth of the paddy rice in the planting tank at the same time; the purification of the water quality and the plantation of a commercial crop are organically combined together; the mutualism relation among different organisms is realized; the nutrient substance is circulated.

Description

technical field [0001] The invention relates to a method for growing rice on water for regeneration and utilization of aquaculture tail water, and belongs to the technical field of aquaculture wastewater treatment and reuse. Background technique [0002] As an ecological water treatment technology, constructed wetland has been widely used in sewage treatment and ecological restoration. Studies have shown (Sun Wenwen, 2014) that when the hydraulic load is 0.33m / d, the highest removal rate of COD, TAN, and TP is 84%, 69%, and 68% by increasing the dissolved oxygen content of the wetland matrix; For biogas slurry wastewater, when the hydraulic load is 0.1m / d, the constructed wetland has the highest removal rate of COD, TAN, and TP, which are 90%, 85%, and 98% respectively (Li Meiling, 2014). The load is below 0.5m / d (He Liping, 2014). However, polluted surface water and rural domestic sewage often have the characteristics of low concentration of N, P and other pollutants and l...

AI Technical Summary

Problems solved by technology

The filter material of the biological aerated filter is generally made of synthetic fibers, polystyrene balls, corrugated plates and other materials. Due to the clogging of the filter material during operation, the water treatment characteristics must be restored by backwashing. The commonly used backwashing method is air Combined backwashing with water, that is, flushing with air first, then flushing with air and water, and finally rinsing with water. Therefore, the construction, use and maintenance of the aeration tank are too expensive.

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