Abstract: ABS wastewater [1] is characterized by high organic matter content, containing heterocyclic organic compounds and being difficult to treat. Acrylonitrile wastewater [2] has the characteristics of complex pollutant components, containing cyanide, and high concentrations of COD and total nitrogen. Through the introduction of an ABS and acrylonitrile wastewater treatment project, this paper analyzes the applicability and advantages of the "pretreatment + double-effect combined air flotation + EBIS low-oxygen biochemical" process in such wastewater, and presents the main process parameters of relevant technologies.

Key words: ABS wastewater, acrylonitrile wastewater, double-effect combined air flotation, low-oxygen biochemical