关键词: 碱渣, 生物处理, 处理效率

Abstract: The high-salt content wastewater treatment system of a petrochemical company in Tianjin is a pretreatment device for refining caustic sludge. Since the treatment of ethylene caustic sludge was added in 2018, the existing activated sludge couldn’t perform effective biochemical treatment with the change of the sources and compositions of caustic sludge. In order to improve the treatment efficiency of ethylene caustic sludge, the process of caustic sludge treatment was optimized by increasing the diluted water, selecting high-efficiency biological bacteria and adjusting control parameters. Through analysis of COD, oil and sulfide removal rate and effluent water quality, it was determined that the optimization scheme could fully degrade the pollutants in caustic sludge, improve the treatment efficiency of the sewage treatment system, and provide beneficial guarantee for the stable operation of the follow-up low-salt content sewage treatment system and the sewage discharge within controlling index of national standard.

Key words: caustic sludge, biological treatment, treatment efficiency