正渗透膜生物反应器膜过滤特性研究

Study on membrane filtration characteristics in forward osmosis membrane bioreactor

以氯化钠为驱动溶质,采用正渗透膜生物反应器处理模拟生活污水,系统地考察了各因素对正渗透膜过滤性能的影响。结果表明,随着驱动液浓度增加,水通量和反向盐通量也随之增加;正渗透膜活性层朝向驱动液时(AL-DS)的水通量和反向盐通量较活性层朝向原料液(AL-FS)时大;水通量和反向盐通量与错流速率正相关,在错流速率较低时增加不明显;随着活性污泥浓度增加,水通量呈下降趋势,而反向盐通量呈上升趋势。

Using sodium chloride as driving solute,simulated domestic sewage has been treated by forward osmosis membrane bioreactor. The influences of various factors on the filtration capacity of the forward osmosis membrane is investigated systematically. The results show that with the increase of driving solution concentration,the water flux and reverse salt flux increase,too. When the active layer of forward osmosis membrane is orientating the driving solution,the water flux of AL-DS（active layer-driving solution） and the reverse salt flux are higher than the active layer is orientating the AL-FS（active layer-feeding solution）. The water flux and the reverse salt flux are positively correlated with cross-flow rate. No significant increase appears,when cross-flow rate is low. With the increase of activated sludge concentration,water flux tends to dropping down,while reverse salt flux tends to rising up.