电凝聚膜生物反应器膜过滤特性

以模拟印染废水为研究对象，考察了ECMBR和MBR系统中的膜污染和污泥混合液特性.结果表明:两系统膜过滤阻力均以沉积阻力为主，MBR和ECMBR中沉积阻力分占总阻力的99%和9334%，但ECMBR总阻力仅为普通MBR污泥总阻力的1/4，电凝聚可有效降低沉积层阻力.对比分析两系统中的混合液特性，ECMBR中污泥平均粒径大，Zeta电位绝对值小，胞外聚合物和溶解性微生物产物浓度低，污泥相对疏水性较高.电凝聚通过改变混合液特性，从而有效改善膜生物反应器过滤性能，增加膜通量，减少膜过滤阻力.

Membrane Filtration Characteristics in Electro Coagulation Membrane Bioreactor

As simulated dyeing and printing wastewater was taken as the research object， the membrane fouling and sludge mixed liquor properties in ECMBR and conventional MBR pilot systems were investigated. The results showed embrane filtration resistance were dominated by cake resistance， the cake resistance makes up 99% and 9334% of total resistance in MBR and ECMBR， respectively. However， the total resistance in ECMBR is 1/4 in MBR， which means electro coagulation can effectively reduce cake resistance. Bigger particle size diameter(PSD)， smaller absolute value of Zeta potential， lower concentration of extracellular polymeric substances (EPS) and soluble microbial products (SMP) and higher relative hydrophobic (RH) of sludge are found in ECMBR than those in MBR by comparing the difference of sludge mixed liquor properties. The electro coagulation is effective to improve the filtration performance of membrane bioreactor， increase membrane flux and decrease the membrane resistance by changing the sludge mixed liquor properties.