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Improving microalgae removal efficiency using chemically-processed clays

Biotechnology and Bioprocess Engineering, ISSN: 1976-3816, Vol: 21, Issue: 6, Page: 787-793
2016
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Article Description

Chemically-processed clays (PRCs) by base and acid treatments were developed to effectively remove microalgae, and their removal efficiencies were evaluated and compared to that of natural clay. The processed clays were produced by using sodium hydroxide and different amounts of sulfuric acid, and their characteristics were analyzed. Microalgae removal efficiency of the clay was varied depending on the amount of sulfuric acid used in treatments. When adding 1 g/L of a PRC-D type (treated with 1.5 v/w sulfuric acid) to the Microcystis aeruginosa suspension (1 × 10 cells/mL), the highest removal performance (87.3 ± 1.5%) without significant pH variation of the suspension was found among tested PRCs, whereas that of natural clay was 32.1 ± 2.2%. Finally, when selected PRC-D showing best efficiency was applied to lake water taken at a local algae bloomed lake, it exhibited 77.6% removal efficiency of microalgae, indicating 1.7 times higher than the natural clay. The results suggest that processed clays in this study could contribute to effective removal of microalgae in the algal-bloomed area with minimal environmental impact.

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