C-MBR系统处理冬季校园污水的中水回用中试

APPLICATION OF C-MBR PROCESS FOR MAKING RECYCLE WATER OF CAMPUS SEWAGE IN WINTER

采用C-MBR组合工艺对校园污水的再生回用处理进行了研究,考察了系统对有机物、TN、TP、色度等的去除效果。结果表明,在有机物含量相对较低的校园污水中,COD、TN、TP的去除率分别达到了82.4%、76.8%及46.5%,平均出水COD和TN、TP的质量浓度分别为44.8 mg/L和13.5、2.8 mg/L;由于陶瓷平板膜的高效截留作用,出水中的色度、浊度及TSS的质量浓度平均分别在34度、0.4 NTU和3.8 mg/L以下,浊度、TSS含量达到了GB/T 18920-2002的要求;延长反冲洗时间和控制曝气量能有效抑制滤饼层的形成,采用次氯酸钠定期清洗膜组件可维持MBR系统的稳定运行,缓解膜污染。

C-MBR process was used for treating campus sewage in order to make recycle water. The removal performances of organism, total nitrogen, total phosphorus, and chroma were investigated. The results indicated that, the removal efficiencies of COD, total nitrogen, and total phosphorus reached 82.4%, 76.8%, 46.5%, respectively, with the average mass concentrations of effluent COD, total nitrogen and total phosphorus were 44.8 mg/L, 13.5 mg/L, and 2.8 mg/L, respectively. Owing to the high interception performance of ceramic membrane, the average values of ehroma, turbidity, and TSS were below 34 degrees, 0.4 NTU, and 3.8 mg/L, respectively. The turbidity and TSS met the requirement of the reuse of urban recycling water-water quality standard for urban miscellaneous water consumption. It is acceptable to restrain the formation of cake layer by prolonging the backwashing time and controlling the aeration rate. In order to keep the MBR system in steady operation and relieve the membrane fouling, sodium hypochlorite can be applied in cleaning the membrane module regularly.