就可反洗平板浸没式膜生物反应器和传统平板浸没式膜生物反应器处理园区生活污水的效果进行比较研究,发现在水力停留时间同为9.6h的条件下,两者几无区别,COD和NH3-N的去除率同样分别为90%和95%,浊度均降至0.7NTU以下,也均无SS检出,出水水质都达到国家生活杂用水水质标准(GB/T18920-2002);但前者因膜具可反洗性,可以延缓膜污染,延长系统稳定运行周期,减少化学清洗频率,既降低运行成本,延长膜使用寿命,又减少化学清洗剂对环境的污染.
A pilot plant with a backwashable flat sheet MBR module and a conventional flat sheet MBR module was set up for treatment of domestic sewage. The performance of simultaneous removal of organics and nitrogen was examined. The degradation of wastewater at a hydraulic retention (HRT) time of 9. 6 h was studied. The results showed that both modules mostly had the same treatment performance. The removal of COD and NH_3-N was 90% and 95% .respectively. Effluent from either treatment was free of SS,and the turbidity was under 0. 7 NTU. The quality of effluent was found to meet the National Miscellaneous Domestic Water Quality Standard (GB/T18920-2002). However,the backwashable MBR module can retard membrane fouling,which prolongs the stable running period of MBR system and reduces the frequency of chemical cleaning due to its backwashable characteristic. The backwashable MBR not only needs less operating cost than the conventional MBR modules,but also protects the environment from the pollution of chemical cleaning agent.
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