Membrane filtration can efficiently harvest microalgae from culture broth. The performances of cyclic filtration and cleaning tests on Chlorella vulgaris were evaluated with polyaluminum chloride (PACl) coagulation and with a surface-modified hydrophilic polytetrafluoroethylene (PTFE) membrane under 1 bar pressure drop. Filtration of the original algal suspension without PACl coagulation could lead to severe irreversible fouling on the PTFE membrane. Coagulation using 10 mgl-1 PACl can mitigate pore blocking but cannot enhance filtration flux. With 500 mgl-1 PACl, most fines were incorporated into large flocs to build up cakes of low resistance and protect membrane pores from severe blocking. Flux recovery all exceeded 95% with ≥10 mgl-1 PACl dosage. The PACl-coagulation and surface modified PFTE membrane are feasible to dehydrate Chlorella vulgaris ESP-6 isolate using cyclic filtration-cleaning process.Supplemental materials are available for this article. Go to the publisher's online edition of Drying Technology to view the free supplemental file.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Physical and Theoretical Chemistry