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Concentration of Single-Cell Dunaliella in Solution and Recycle of Nutrient Components from Algal Residue by Uf

Chunhui Hao1, Mingde Yang1, Ranil Wickramasinghe2, and Zhen Chen1. (1) Division of Green Chemistry and Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, China, (2) Colorado State University, Department of Chemical Engineering, Fort Collins, CO 80523-1370

Dunaliella contains many nutrients, such as glycerin, proteins etc. Dunaliella could be grown under non-sterile cultivation conditions at high saline concentrations. However, the dispersed cells are difficult to harvest because of their fragility In this study, we tried to use dead-end flat sheet membrane filtration set and cross flow hollow fiber filtration set to concentrate Dunaliella cell solutions and to recycle nutrient components from algal residue solutions. Fouling mechanisms of Dunaliella algae on the UF membrane were studied by analyzing flat sheet membrane flux data at different membrane washing conditions. The effects of temperature, pressure and backwash conditions on hollow fibers separation performance were measured. As predicted, most of the cells are broken during cross flow hollow fiber filtration, and the residual mass collected by centrifugation decreases after condensation. However, total loss of some nutrient components from the permeate stream such as proteins, amyloses and chlorophyls was observed. As these components are rejected by the membrane they could be recovered by a hybrid proves.