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Effect of MLSS Concentration on Flux of Submerged Membrane Bioreactor with Gravitational Filtration under Various Temperature and Operating Pressure


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Effect of MLSS Concentration on Flux of Submerged Membrane Bioreactor with Gravitational Filtration under Various Temperature and Operating Pressure
LI Zheng1QI Pei-shi1CHEN Zhao-bo2
1.School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China;2.College of Material Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China
mixed liquor suspended solids concentration membrane flux temperatures operating pressures
A laboratory-scale submerged membrane bioreactor(SMBR) with gravitational fltration is tested for treating synthetic wastewater.The effect of the concentration of mixed liquor suspended solids ρ on membrane flux is investigated under various temperatures and operating pressures.The results show that the effect of ρ on the membrane flux demonstrates the same trend under various temperatures at 20 kPa operation pressure.The membrane flux declines rapidly with the increase of ρ from 0.65 to 2.7 g/L.Changes of ρ has little influence on the membrane flux at the range of ρ from 2.7 to 8.36 g/L.The membrane flux decreases slowly with the increase of ρ from 8.36 to 12.6 g/L.The membrane flux enhances with the increase of temperature.The membrane flux decreases rapidly with the increase of ρ at higher operation pressures(20 kPa and 30 kPa).However,ρ has little effect on the membrane flux at lower operating pressure(10 kPa).A model between membrane flux and ρ is developed that can be applied well at various temperatures and operating pressures.


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Last Update: 2012-12-19