Method and system for recycling and purifying treatment of biogas slurry

Abstract

The invention relates to a method and system for recycling and purifying treatment of biogas slurry. The method is characterized by comprising the following steps of: (1) collecting the biogas slurry through a biogas slurry pool, then starting a sewage pump, pumping liquid above a tower box at the top of a high level water tower, and carrying out upward spraying aeration; (2) dropping the liquid flowing out from the bottom of the tower box slantwise along a vacuum overflow weir, and elevating a driving water wagon upwards to further purify and aerating; (3) introducing the liquid dropping from the water wagon to a deflecting pool through a water channel, and further sedimenting to remove impurities; and (4) introducing the liquid flowing out from the deflecting pool to a solar evaporator,and then collecting purified water. The method of the invention has skillful concept, convenience for operation, energy saving, environmental protection and economic benefit, and can be widely used for the process of the purifying treatment and the recycling of the biogas slurry.

Description

technical field [0001] The invention relates to a sewage purification treatment method and system, in particular to a biogas slurry recycling and purification treatment method and system. Background technique [0002] Large-scale biogas projects discharge a large amount of biogas slurry every day. The large amount of biogas slurry after solid-liquid separation cannot be fully converted into liquid organic compound commercial fertilizers when the market has not been vigorously developed, which causes great pollution pressure on the environment. Secondary non-point source pollution leads to waste of resources; it is very difficult to meet the corresponding national emission standards, and the operating cost is very expensive. Therefore, when constructing large-scale biogas projects for livestock and poultry farms, it is necessary to seek scientific and reasonable purification treatment methods to reduce emissions, reduce investment and operation costs and treatment costs. [...

AI Technical Summary

Problems solved by technology

However, in areas without the above-mentioned conditions, it is difficult to implement in the eastern areas and suburbs with a lot of people and less land. If it is directly discharged into rivers and underground, or directly used for irrigation, since the discharged biogas slurry has not been treated, it cannot meet the national regulations. The minimum discharge standard will seriously pollute the water quality, and the water quality standard for farmland irrigation is ≤150-300mg / L, and the untreated biogas slurry cannot meet the environmental protection standard

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