直接过滤-臭氧-生物活性炭工艺用于城市污水二级处理出水深度处理的研究

Advanced treatment of secondary effluent of WWPT by sand filter-ozone-biological activated carbon

采用砂滤-臭氧-生物活性炭工艺在北京市某污水处理厂开展了以污水再生回用为目的的城市污水深度处理中试研究。在臭氧消耗量5 mg/L,接触时间20 m in,生物活性炭空床停留时间(EBCT)为20 m in的条件下,出水浊度为1.5NTU左右,色度接近0,UV254从0.162 cm-1降低到0.08 cm-1,DOC和CODMn分别从10.1 mg/L和12.8 mg/L降低到6 mg/L左右。由于对生物活性炭柱进行了曝气供氧,NH4+-N从40 mg/L降低到5 mg/L左右。

Advanced treatment of secondary effluent of city sewage disposal plant was conducted for water reclamation at Beijing, with a process of sand filter,pre-ozonation followed by biological activated carbon filter in pilot scale. With an average contact time of 20 min at ozone wastage of 5 mg/L, and BAC column at EBCT of 20 min,the process achieved a remarkable effect of advanced treatment of municipal wastewater. Turbidity was below 1.5 NTU and chroma was close to 0, and UV254 remarkably declined from 0. 162 cm^-1 to 0.08 cm^-1 The average removals of DOC and CODMn were decreased from 10.1 mg/L and 12.8 mg/L to 6 mg/L. BAC filter had a high NH3-N removal which reduced it from 40 mg/L to 5 mg/L because of enough air supply.