附着性胞外多聚物对HMBR膜污染控制性能的影响

Effect of bond extracellular polymeric substances on membrane fouling control property of a HMBR

采用复合式膜生物反应器(HMBR)处理城市生活污水,对附着性胞外多聚物影响HMBR膜污染控制性能的作用机理进行了研究。实验结果表明,HMBR中附着性胞外多聚物、松散附着性胞外多聚物和紧密附着性胞外多聚物的浓度比常规膜生物反应器分别降低了10.0%、43.6%和2.1%。附着性胞外多聚物与膜表面滤饼层污泥比阻的关系较为密切,随着其浓度逐渐降低,滤饼层污泥比阻相应减小。与紧密附着性胞外多聚物相比,松散附着性胞外多聚物对滤饼层污泥比阻的影响程度更深。因此,随着反应器中附着性胞外多聚物特别是松散附着性胞外多聚物浓度的降低,HMBR的膜污染控制性能增强,反应器中膜表面的滤饼层阻力比常规膜生物反应器降低了56.9%。

An experiment was conducted to study the effect of bond extracellular polymeric substances （B-EPS） on the membrane fouling control property of a hybrid membrane bioreactor （HMBR）. Results showed that the B-EPS, the loosely bond extracellular polymeric substances （LB-EPS） and the tightly bond extracellular polymeric substances （TB-EPS） in the HMBR decreased by 10.0% , 43.6% and 2.1%, respectively, compa- ring with the conventional membrane bioreactor （CMBR）. The B-EPS had a significant correlation with the spe- cific resistance to filtration of the cake layer, the lower the former was, the smaller the latter became. Otherwise, the LB-EPS affected the specific resistance to filtration of the cake layer more strongly than the TB-EPS. As a re- sult, with the B-EPS especially the LB-EPS decreasing, the HMBR showed a good property of membrane fouling control and the cake laver resistance in which decreased by 56.9% comoaring with tha CMBR.