Method and device for cyclically treating breeding wastewater and/or improving soil by utilizing livestock and poultry manure

Abstract

The invention discloses a method and a device for cyclically treating breeding wastewater and/or improving soil by utilizing livestock and poultry manure. The method comprises the following steps: adding a conditioner into livestock and poultry manure for mixing and conditioning; then pre-drying and dehydrating at low temperature to reduce the moisture content to be less than 10% to obtain dried livestock and poultry manure, indirectly heating the livestock and poultry manure in a pyrolysis and carbonization device, indirectly cooling the obtained charcoal powder, and adding the obtained cooled charcoal into breeding wastewater; and forming charcoal particles; the invention can be directly used for soil improvement; part of COD, ammonia nitrogen, phosphorus and other effective elements andantibiotics and other micropollutants can be pre-removed, and the biochemical treatment load of the aquaculture wastewater is reduced; or the invention is used for deep adsorption and purification ofaquaculture wastewater before tail water is discharged. According to the method and device, pollution caused by simple composting of livestock and poultry manure is avoided, comprehensive treatment of breeding waste is fully achieved, and good social benefits, economic benefits and environmental benefits are achieved.

Description

technical field [0001] The invention relates to the field of harmless treatment of solid waste, in particular to a method and a device for recycling livestock and poultry manure to treat breeding wastewater and / or soil improvement. Background technique [0002] Due to the failure of timely and harmless treatment and scientific utilization of livestock and poultry manure in key areas of my country's agriculture and animal husbandry industry, the problem of environmental pollution caused by its arbitrary discharge has become increasingly prominent. Livestock and poultry manure is an important part of "urban minerals". The total nitrogen content is 13.946 million tons, and the total phosphorus content is 3.785 million tons. It is a good organic fertilizer. However, the antibiotic residues in livestock and poultry manure can reach the concentration level of mg / kg, and the highest can even reach 200mg / kg. These livestock and poultry manures, which contain a large amount of antib...

AI Technical Summary

Problems solved by technology

During this process, the loss rate of nitrogen and phosphorus reached more than 30%, which had a long-term impact on the degradation of the water environment in the basin; at the same time, the residual antibiotics in the livestock and poultry manure would inevitably be transferred to the environment, causing a series of environmental problems and increasing environmental pollution. Antibiotic resistance gene pollution threat, affecting the ecological environment of the soil and plant growth, affecting the ecological environment of the water, etc., posing a threat to human health and environmental safety

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