Effect of Suspended Carriers on Extracellular Polymeric Substances in MBR

以聚丙烯无纺布为膜组件，向浸渍式膜生物反应器中投加悬浮填料处理人工废水。考察不同曝气量下MBR中污泥混合液以及膜组件表面污泥EPSS、EPSB和EPS的变化。结果表明，MBR中添加悬浮填料能增加污泥混合液中EPSS和EPSB的浓度，而对膜组件表面污泥中EPSS和EPSB影响，与曝气强度有关。在曝气量为0.10 m3/h时，添加悬浮填料能增加污泥中的EPSS和EPSB的浓度，当曝气量增大到0.25 m3/h时，添加悬浮填料的污泥中的EPSS和EPSB的浓度有所降低。曝气量对MBR污泥混合液及膜组件表面污泥EPS影响的研究结果表明，采用添加悬浮填料控制MBR膜污染时存在一个优化的曝气量，在此曝气量下，能实现有效地延缓和控制膜污染。 Suspended carriers were added into a submerged membrane bioreactor (SMBR) using polypropylene non- woven fabric (PP NWF) as membrane model to treat synthetic wastewater. The changes of EPSS, EPSB and EPS in activated sludge mixing liquid of MBR and in sludge on membrane model surface were researched at different aeration rate. The results showed that adding suspended carriers in MBR can increase the concentration of EPSS and EPSB in activated sludge mixing liquid, but the effect on EPSS and EPSB in the sludge on membrane model surface is related to aeration rate. Adding suspended carriers can increase the concentration of EPSS and EPSB in the sludge on membrane model surface at 0.10 m3/h of aeration rate; the concentration of EPSS and EPSB in the sludge with suspended carriers is reduced when aeration rate is increased to 0.25 m3/h. The study on the effect of aeration rate on EPS in sludge mixing liquid of MBR and in sludge on membrane model surface showed that an optimized aeration rate exists if suspended carriers are added to control MBR membrane fouling. At the optimized aeration rate, membrane fouling can be mitigated and controled effectively.