Abstract: The traditional hydrolysis acidation and aerobic oxidation processes were improved. Based on analysis of wastewater from the Northeast General Pharmaceutical Factory, a complex process of pretreatment, comprehensive hydrolysis acidation and comprehensive aerobic oxidation was designed and applied in wastewater treatment engineering with capacities of 30 000 m³/d . Results of the two years operation showed that this process has property of stable efficiency and strong ability for resisting shock load. When average influent COD concentration was 3 600 mg/L, BOD₅ was 1 000 mg/L and SS was 450 mg/L. The effluent concentration of COD was below 300 mg/L, BOD₅ was below 100 mg/L, SS was below 50 mg/L. The effluent’s concentration achieves the national pharmaceutical enterprises effluent standards for grade 3.

Key words: synthetic pharmacy wastewater, engineering, comprehensive hydrolysis acidation, comprehensive aerobic oxidation