MBR的临界膜通量及其影响研究.pdfVIP

3 9 环境 工程学 报 Vol. 3, No. 9 2 0 0 9 9 Ch inese Journal of Environm entalEngineering Sep . 2 0 0 9 MBR 李顺义 位红卫 吕斯濠 李 伟 王 岩 ( , 45000 ) MBR, , MBR, , 2 2 019 m /s 18 m /s, 2~ 4 L / (m # h) 6~ 8 L /(m # h), , 01997, 2: , 72% , , 6815% MBR X703 A 673-9 08( 2009) 09- 585-04 Research of criticalmembrane flux and its factors inMBR Li Shunyi W eiHongw ei L™Sihao LiW ei W ang Y an ( Departm ent of Env ironm ental Science, College ofChem ical Engineering, ZhengzhouU niversity, Zhengzhou 45000 , China) Abstract The critical flux ofMBR in treating landfill leachate was determ ined using the flux-step method in the expermi ent, and the influence of the velocity of gas liquid tw o phase flow at themembrane surface on crit-i cal flux w as investigated1 The result indicated that the tw o phase flow velocity cou ld affect the critical flux dra- matically1Wh ile the two phase flow velocity w as increased from 019 m /s to 18m /s, the critical flux would in- 2 2 crease from 2~ 4 L /( m # h) to 6~ 8 L /(m # h) 1 Their correlation presented linearly because of the coef- ficient of 019971 The operation characteristics under sub- critical flux revealed that themembrane fouling could be d ivided into wt o stages1 The first stage w as irreversible period, in wh ich the gel fouling was the dom inant process and caused 72% of the total resistance1 The second stagew as reversible period, in wh ich the cake for- mationw as the control factor and caused 6815 % of the total resistance1 Key words M BR; membrane fouling; critical flux; sub-critical flux