The Study On The Operation Principles Of Submerged Membrane Bioreactors With Different Membanne-modules

Different membrane-modules would impose different influence on the operation of submerged bioreactor (SMBR). Using two sets of SMBR with three suits of membrane-modules (SL, LS, XHC) which were common in their material (PVDF) but different in their poresize, this study had investigated the differences in their anti-fouling and interception abilities from their module structure and membrane poresize.Observation of the membrane material showed that the machinery intensity of SL is greater than XHC. Study on the structure of membrane-modules indicated that anti-fouling abilities of curtain-shaped membrane-modules with membrane bag(SL/LS) is superior to the column-shaped bundled one (XHC) without it. Critical fluxs under three different sludge concentrations were investigated with the method of flux stepwise increment and were proved to be available by short-term operation. Under middle sludge concentration (10g/L), impacts of sludge concentration on critical flux is not greater. Under high sludge concentration (15g/L), critical flux of SL and LS declined, yet XHC didn't change.The differences in interception of pollutant by membrane with different poresize were studied under periodic cleaning. For intercepting organic matters and virus, the smaller the poresizes were, the more they intercepted. But the membrane contributed nothing to the interception of little inorganic atoms such as NH₃-N, TP, TN.