Biogas slurry harmless treatment and resource utilization technology for large-scale pig farm

Abstract

The invention relates to a biogas slurry harmless treatment and resource utilization technology for a large-scale pig farm. The biogas slurry harmless treatment and resource utilization technology comprises the following steps: firstly, collecting manure in a livestock pig farm by using dry collection and carrying out solid-liquid separation; secondly, putting biogas slurry in the first step intoa special conical reactor of a pretreatment system for carrying out adsorption treatment through a sewage draining passage; thirdly, feeding the biogas slurry treated in the second step into an aerobic system for carrying out biochemical treatment; fourthly, detecting the liquid obtained in the third step; if the liquid meets the Livestock And Poultry Breeding Wastewater Discharge Standard GB18596-2001, COD is smaller than or equal to 150mg/l, BOD is smaller than or equal to 400mg/l and ammonia-nitrogen is smaller than or equal to 80mg/l, recovering the liquid for fertilizer utilization. The biogas slurry harmless treatment and resource utilization technology disclosed by the invention has the advantages that the conical reaction kettle and the aerobic system are adopted, so that the investment of facilities can be greatly reduced; meanwhile, pollution factors in the biogas slurry in the pig farm are removed through adsorption; the biogas slurry subjected to adsorption treatment undergoes biochemical treatment by the aerobic system; the treated liquid accords with the Livestock And Poultry Breeding Wastewater Discharge Standard, so that the liquid can be recovered for fertilizer utilization.

Description

technical field [0001] The invention belongs to the field of water pollution control of environmental engineering, and in particular relates to a process for harmless treatment of large-scale pig farm biogas slurry and resource utilization. Background technique [0002] With the continuous improvement of people's living standards, my country's livestock and poultry breeding industry has developed rapidly. The livestock and poultry breeding industry has become one of the pillar industries of my country's agricultural development. Among them, the number of pigs and sheep raised ranks first in the world, and the large-scale pig raising has reached more than 40%. However, the rapid development of large-scale breeding industry has caused a large increase in breeding waste (solid, liquid), and the problem of environmental pollution has become increasingly prominent. [0003] At present, the feces of large-scale poultry farms in my country are generally treated by the oxygen ferme...

AI Technical Summary

Problems solved by technology

Third, the biogas slurry contains some harmful heavy metals, antibiotics, and hormones, which will cause secondary pollution if not treated

Fifth, the coexistence of harmful and beneficial ingredients to plants brings complexity in biogas slurry treatment process and technology

However, for my country's low-profit farming industry, the construction of such manure treatment facilities requires too much investment and high operating costs.