Farmland nitrogen and phosphorous non-point source pollution control and recycle system, and method thereof

Abstract

The invention relates to a farmland nitrogen and phosphorous non-point source pollution control and recycle system, and a method thereof. The system comprises a water collector, an adsorption unit and a water store which are sequentially arranged from the upstream to the downstream according to farmland surface runoff and underground runoff paths. The water collector, the adsorption unit and the water store are sequentially transversely arranged according to the farmland surface runoff and underground runoff paths, so when rain falls or irrigation is carried out, the farmland water is surplus, meets in the water collector through the farmland surface runoff and underground runoff, the water in the collector continuously downward flows and goes through the adsorption unit, nitrogen (N) and phosphorous (P) are adsorbed, the purified farmland drainage enters the water store, and the superfluous purified drainage is discharged to a river and a lake; and when farmland recharging is carried out, the water which reversely flows goes through the adsorption unit for the N and P desorption, and the desorbed N and P enter the water collector with the water flow, afresh enter the farmland and are adsorbed and utilized by crops. Compared with the prior art, the method has the advantages of pollution control, recycle, fertilizing cost saving and the like.

Description

technical field

[0001] The invention relates to the field of agricultural environmental protection, in particular to a technology for controlling and recycling agricultural nitrogen and phosphorus non-point source pollution. Background technique

[0002] With the effective control of point source pollution such as industrial wastewater and urban domestic sewage, agricultural non-point source pollution has become an important source of water environment pollution. Among them, nitrogen (N) and phosphorus (P) pollution is a typical type of agricultural non-point source pollution, which is the main substance causing eutrophication of water bodies. The survey shows that in European and American countries, N and P pollution have become the largest pollution sources of rivers and lakes. In Sweden, the Netherlands, and Finland, 60% to 87%, 40% to 60%, and more than 50% come from agricultural non-point source pollution. The situation of N and P pollution in my country's water bodies ...

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