Study on the efficacy of anaerobic biological treatment of industrial wastewater

In this research, we examined the internal circulation (IC) reactor performance on fur processing wastewater and explored the optimum operation parameters of IC reactor with high concentration volatile fatty acids (VFA) by a 60d field test in middle temprature. The results showed that the wastewater can be adapted to the IC reactor and start rapidly. In steady operation stage, when the influent CODcr concentration stabilises at under 3000 mg·L-1 and the acidibility is at around 45%, there is no apparent VFA accumulation and the effluent CODcr removal rate remained stable at about 55%. When the concentration of influent CODcr exceeds 3000 mg·L-1 and fluctuations obviously, the average removal rate of CODcr is about 50%. The average removal rate of grease is 61.3%, and the HRT is 6 h. Compared with the existing hydrolysis acidification and aerobic treatment, IC reactor treatment has improved the efficiency of VFA degradation significantly, which indicates that IC reactor has great engineering applicability for treating fur processing wastewater.