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Optimization of flocculation condition and Chlorella biomass harvesting research by pulse bubble dissolved air flotation
Pages: 1521-1526
Year: Issue:  10
Journal: Rural Energy

Keyword:  harvestpressure dissolvingair flotationChlorella sp.pulse;
Abstract: A dissolved air flotation experiment that dissolving air with pulse bubble-liquid in a pressure tank was used to harvest biomass of Chlorella sp. In order to make the optimum addition solution of flocculation agents, orthogonal beaker experiments was carried out to investigate the effect of coagulant(FeCl3), flocculant(PAM) and pH on flocculation of Chlorella sp.. Then,the flow rates of feed and circulation water used for dissolving air and feed site were changed during the flotation experiments to understanding their effect on biomass recovery rate, while agents were added according to optimum solution offered by beaker experiment. The results showed that, when pH was adjusted from 7 to 10, flocculation rate rised with the increase amount of FeCl3 but no obvious change due to pH itself;This situation reversed when pH value up to 11, in this pH value,algae cells flocculated strongly that the flocculation rates were over 96%, and the influences of other agents could be neglected. During air flotation, feeding flow rate, circulation flow rate and feeding site constructed a certain flow pattern in the column, which determined the adhesion efficiency of flocs to bubbles and effect the flotation recovery ultimately. The results showed that a certain circulation flow rate and higher column can increase the air flotation harvesting rate.
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