臭氧催化氧化——曝气生物滤池工艺深度处理食品添加剂废水

采用臭氧催化氧化-曝气生物滤池(BAF)工艺深度处理食品添加剂生产废水,分别用MnO2、负载MnO2的陶粒作为催化剂。在废水体积200mL,加入负载MnO2的陶粒2g,O3/COD比值为0.75,调节废水pH为4,通O3时间为5min的最佳操作条件下,废水COD值由400mg/L降至220mg/L,去除率达45%。原废水含较多难生物降解有机物,经O3氧化预处理后,COD下降45%,其BOD5/COD比值由0.3升为0.44,更易于生化降解。采用催化臭氧氧化-BAF组合工艺处理食品添加剂废水,COD去除率高达85%,处理效果良好。

Advanced Treatment of Food Additives Wastewater by Catalytic Ozonization-Biological Aerated Filter Processes

The catalytic ozonization-biological aerated filter processes were used to treat food additives wastewater using MnO2, ceramsite loaded by MnO2 as catalysts respectively. The optimal operating conditions of catalytic ozonization preoxidation were as follows: the wastewater volume was 200 mL, the ceramsite loaded by MnO2 dosages were 2 g, the O3/COD ratio was 0.75, and pH value was 4, oxidation time was 5 min. The results showed that the COD of the wastewater was removed from 400 mg/L to 220 mg/L, the removal efficiency of COD was 45 %. The catalytic ozonization preoxidation could improve the biodegradability of wastewater, whose BOD5/COD ratio raised form 0.3 to 0.44 when 45 % COD was removed. The contact oxidation process treatment was followed by the catalytic ozonization. COD removal efficiency of catalytic ozonization-biological aerated filter process was more than 85 %.