Abstract: The phenolic wastewater discharged from phenol and acetone plant is characterized by high salt concentration, high organic concentration and high bio-toxicity. This chemical wastewater has complex composition and is difficult to be treated. According to the characteristics of phenol/acetone wastewater, Littoral Chemical (Tianjin) Co., Ltd. has obtained special bacteria by screening and domesticating. And through the combination of MBR and Fenton technology, a field test of phenol/acetone wastewater was carried out in a chemical enterprise in Tianjin. On the basis of the field test, the treatment scheme for phenol/acetone wastewater was optimized to achieve the water saving and emission reduction goals of the enterprise. After mixing the phenol/acetone wastewater with the spent caustic wastewater from ethylene plant after wet oxidation and other production wastewater, a test was carried out in the laboratory using the combined process of MBR and Fenton. After treatment, the wastewater COD is less than 40mg/L and the ammonia nitrogen is less than 2mg/L, which meet the Grade V environmental quality standard for surface water (GB3838-2002)

Key words: phenol/acetone wastewater, special bacteria, membrane bioreactor/MBR, Fenton processing technology