期刊
DESALINATION
卷 145, 期 1-3, 页码 265-272出版社
ELSEVIER
DOI: 10.1016/S0011-9164(02)00421-6
关键词
ultrafiltration; critical flux; air injection; immersed membrane; coagulation
The aim of this study is to determinate optimum conditions, membrane configuration, air flow, coagulation rate, permeate flux, for the ultrafiltration of surface water. Results show how coagulation is a necessary pre-treatment to remove micro-particles in aqueous suspension (i) before a conventional sedimentation, (ii) before a membrane filtration. When membranes are immersed in a contactor, configuration allow to maintain the permeate flow rate at high value (200 L/h/m(2)/bar) mainly because coagulation induces large floc size. However, when the particle concentration of the suspension is very high (2 to 5 g/L), it is important to increase the shear stresses close to the immersed membrane to minimise a deposit set up on the surface. When no high cohesion forces exist between particles, the aeration, even under weak flow rate, allows to avoid this deposit making.
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