UASB-two stage A/O-coagulation process for treatment of pig farm biogas slurry

Abstract

A UASB-two stage A / O-coagulation process for treatment of pig farm biogas slurry. The pig farm biogas slurry successively passes through and is treated in a regulating tank, an upstream anaerobic sludge bed reactor (UASB), a primary anoxic / oxic tank (primary A / O), a second anoxic / oxic tank (secondary A / O), a mid-sedimentation tank, a coagulation tank, a second-sedimentation tank, and a disinfecting tank, and finally is discharged after reaching standard. The two A / O process stages are connected in-series front and back, wherein in the first A / O stage, an active sludge process is employed, so that phosphorous is removed through a sludge discharge method by reducing age and hydraulic retention time of the sludge; and in the second A / O stage, a bio-membrane process is employed and a combined pack is arranged in the tank, so that denitrification is enhanced since a bio-membrane enriches denitrifying bacteria. The combined process has significant nitrogen and phosphorus removal effect and stable treatment effects, is strong in shock load resistance, has simple operation and has low operation cost. After treatment through the combined process to the pig farm biogas slurry, indices of discharged water satisfy demands in Discharge Standard of Pollutants for Livestock and Poultry Breeding (GB 18596-2001).

Description

technical field [0001] The invention relates to an improved upflow anaerobic sludge bed reactor (UASB), two-stage anoxic / aerobic (two-stage A / O) and coagulation comprehensive treatment process for pig farm biogas slurry, and belongs to the technical field of environmental protection water treatment. Background technique [0002] In recent years, my country's large-scale livestock and poultry breeding industry has developed rapidly, which has caused serious environmental pollution while increasing income and improving people's living standards. Discharge pollution from livestock and poultry breeding industry has become one of the main factors of rural non-point source pollution in my country, and also the third largest pollution source after industrial wastewater and domestic sewage. Statistics show that in 2010, the chemical oxygen demand (COD) discharged by the national livestock and poultry breeding industry has reached 12.6826 million tons, of which the high-concentration...

AI Technical Summary

Problems solved by technology

Biogas slurry from pig farms is still organic wastewater with high ammonia nitrogen, direct aerobic treatment, excessive energy consumption and high operating costs

The appropriate solution should be an anaerobic and then aerobic combined treatment process, but at this stage there is still a lack of economical, reasonable and technologically mature combined processes to treat this type of wastewater

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