The role of colloids and SMPs on membrane fouling in a flatsheet/hollow fiber submerged anaerobic membrane bioreactor (SAMBR) under varying HRTs
Anaerobic membrane reactors (AnMBRs) have many advantages over aerobic MBRs in terms of energy balances and solids production.However,serious membrane fouling can be a limitation in the operation of both,resulting in lower fluxes,higher membrane areas,and higher capital costs.The effect of HRT has never been examined in much depth in AnMBRs,so this work examined its effect (12,6,2-3 hrs) on both flat sheet and hollow fibre systems.It determined their critical fluxes under both 20 min and 24 hr flux steps,and disaggregated the fouling into Soluble Microbial Products (SMPs <0.45μm),colloids (>0.45 μm,< 1 μm),and big flocs (>1 μm).The critical flux for flat sheet reactors was found to be smaller (24 LMH) under 20 min steps than 24 hrs (33 LMH).In contrast,with hollow fibres the critical flux was considerably lower (15 LMH),and this probably due mainly to the different hydrodynamics in each reactor.The composition of the fouling layer changed with HRT,and colioids/flocs were just important in fouling as SMPs were.Finally,the floc size in the flat sheet reactor was 50% bigger than the hollow fiber system,while the colloid sizes and Zeta potentials were very similar,and did not appear to change with shortening HRT.
Anaerobic digestion membranes fouling SMPs and colloids flat sheet versus hollow fiber
Zhang Q. Singh S. Stuckey D.C.
Advanced Environmental Biotechnology Centre (AEBC), Nanyang Technological University, Singapore Advanced Environmental Biotechnology Centre (AEBC), Nanyang Technological University, Singapore;Chem
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
562-565
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）