Abstract
Laboratory experiments were conducted to compare the effectiveness of chitosan (by-product derived from shrimp and crab shells), Zetag 63 and CF 400 (hydrolyzed polyacrylamide) as flocculants to concentrate a mixed culture of chlorophyceae dominated by Chlorella sp. The algae were grown in a high-rate algal pond (HRAP) fed with dilute pig-waste. Algal sedimentation rates were measured in the laboratory. For a pH range of 6·0–9·0, flocculation efficiency of 95–100% was obtained at 20 mg/liter chitosan and 5 mg/liter Zetag 63. The optimum range of initial biomass concentration for maximum algal recovery was found to be 100–200 mg dry weight algae/liter.
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