Resource utilization method for pig farm biogas slurry

Abstract

The invention relates to a resource utilization method for pig farm biogas slurry. Fermented biogas slurry of a pig farm is sequentially subjected to links as follows: multi-stage aeration and filtration, inoculation and culture of photosynthetic bacteria, inoculation of cladoceran filter-feeding photosynthetic bacteria, collection of cladocerans, filtrate inoculation and culture of unicellular algae, inoculation of cladoceran filter-feeding unicellular algae, collection and treatment of the cladocerans, and recycling or emission of water up to the standard. In the treatment process, the photosynthetic bacteria are utilized to degrade organic matters in the biogas slurry and generate thalli firstly, then nutritive salts containing nitrogen, phosphorus and the like in water are absorbed by microalgae to generate algae, and eventually, the cladocerans are utilized for filter-feeding thalli and algae in the water in a non-selective manner. According to the resource utilization method for the pig farm biogas slurry, the photosynthetic bacteria, the unicellular algae and the cladocerans generated in the biogas slurry treatment process can be used for aquaculture and bait, and resource utilization of contaminants in the biogas slurry is achieved by the aid of the food chain; the method has the characteristics of low investment and energy consumption and capability of producing apparent economic and ecological benefits.

Description

technical field [0001] The invention relates to the technical field of pig farm biogas slurry treatment, in particular to a method for resource utilization of pig farm biogas slurry. Background technique [0002] With the growth of population, the improvement of people's living standards and the rapid development of social economy, the human demand for animal protein is also gradually increasing. The key to solving the shortage of human animal protein depends on breeding, and the development of livestock and aquaculture is an important measure to solve the shortage of animal protein. The waste gas, waste liquid and waste residue produced in the process of large-scale livestock and poultry breeding often cause great pressure on the surrounding ecological environment protection. Breeding pollution has become the main source of agricultural and rural environmental pollution. Breeding sewage and liquid excrement are the difficulties in the harmless treatment of pollutants in i...

AI Technical Summary

Problems solved by technology

Existing experimental studies have shown that different microalgae have different tolerance, absorption and utilization capabilities to different forms of nitrogen, phosphorus and other nutrients in water bodies.

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