臭氧曝气沸石生物滤池处理硝基苯废水

利用臭氧曝气沸石生物滤池处理硝基苯废水,了解了该方法对废水中的硝基苯、氮和磷的去除效果,考察了水力停留时间的变化对污染物去除效果的影响。臭氧曝气沸石生物滤池与空气曝气沸石生物滤池相比,臭氧曝气生物滤池对硝基苯、COD、氨氮的去除效果优于空气曝气沸石生物滤池,对总磷的去除效果与空气曝气沸石生物滤池差别不大。当臭氧曝气沸石生物滤池的HRT=4 h、臭氧浓度为126 mg/L时,对初始浓度为100 mg/L的硝基苯污水去除率接近99%。在相同条件下,空气曝气沸石生物滤池对硝基苯的去除率仅为59%。在HRT=4 h、臭氧浓度为126 mg/L时,臭氧曝气沸石生物滤池与空气曝气沸石生物滤池对COD的去除率为94%和83%,对NH4+-N的去除率为64%和59%,对TP的去除率为42%和45%。

Ozone aerated zeolite biological filter for treating nitrobenzene wastewater

Wastewater containing nitrobenzene was treated with an ozone aerated zeolite biological filter (OAZBF), and its performance in regards to the removal of nitrobenzene, nitrogen, and phosphorus was investigated. The relationship between the hydraulic retention time and the purification performance of the OAZBF was also studied. The removal efficiencies for nitrobenzene, chemical oxygen demand (COD), and ammonia nitrogen were better for the OAZBF than for the zeolite biological filter aerated with air; however, only small differences in total phosphorous (TP) removal were detected between the two biological filters. The OAZBF achieved nearly 99% nitrobenzene removal when the hydraulic retention time was 4 h, the ozone concentration was 126 mg/L, and the initial concentration of nitrobenzene was 100 mg/L. Under the same conditions, nitrobenzene removal by the zeolite biological filter aerated with air was only 59%. When the hydraulic retention time was 4 h and the ozone concentration was 126 mg/L, the removal efficiencies of COD, NH4+-N, and TP were 94%, 64%, and 42%, respectively, for the OAZBF and 83%, 59%, and 45%, respectively, for the zeolite biological filter aerated with air.