The Law of the Residual COD in Distilled Spirit Wastewater after Two Stages of Biochemical Treatment

摘要

Based on the tests of the high concentration organic wastewater from the sampling of Maotai flavor liquor enterprises in Chishui River Basin after two stages of biochemical treatment, this study found out the residue COD concentration range and investigated the rules of its formation. Under anaerobic conditions, the inert COD (SI) were measured. The experimental results showed that: the anaerobic retention time was 48 hours and the COD concentration of the effluent after aerobic biological treatment was about 300～350mg/L, the residual BOD_5 accounted for 1～2%, the difficult to degrade in raw water COD accounted for 28～33% and SMP accounted for 65～73%. In conclusion, the research findings can provide a scientific justification for the depth treatment process of liquor wastewater to reach the standard.