催化臭氧化-曝气生物滤池深度处理柠檬酸废水

Advanced treatment of citric acid wastewater by catalytic ozonization-biological aerated filter(BAF) process

针对柠檬酸生产废水二级生化出水色度高、难生化降解的特点,采用催化臭氧化-曝气生物滤池组合工艺对其进行深度处理。结果表明,该组合工艺可实现废水脱色和降解有机物的目的。当催化臭氧化接触氧化时间为30 min,臭氧投加量为22.5 mg/L;BAF气水比为3∶1,水力停留时间为3 h时,出水COD降至60 mg/L以下,色度维持在10~15倍,处理出水达到《城市污水再生利用工业用水水质》（GB/T 19923—2005）的标准。

Since secondary bio-treated citric acid wastewater is characterized by high colority and difficult biochemical degradation,the combined process,catalytic ozonation-biological aerated filter（BAF）,has been used for its advanced treatment. The results show that the combined process could achieve the goals of wastewater decoloration and organic substance degradation. Under the following conditions：catalytic ozonation reaction time is 30 min,ozone dosage 22.5 mg/L,BAF gas-water ratio 3 ∶1,and hydraulic retention time 3 h,the effluent COD can be reduced to lower than 60 mg/L,and effluent colority is kept at 10-15 times. The treated effluent reaches the standard specified in ＂Reclaimed Utilization of Urban Sewage-Water Quality for Industrial Use＂（GB/T 19923—2005）.