Abstract：As most clay minerals are negatively charged, they need to be modified to improve the algae removal capacity, which, however, leads to increased cost and secondary pollution. Therefore, this paper explores the feasibility to use positively charged clay minerals for algae removal. Mg/Al hydrotalcite (Mg/Al-LDH) was synthesized by co-precipitation method and its calcination product (Mg/Al-LDO) was prepared by heating Mg/Al-LDH at 400℃. To know the practical applicability, a detailed study of Microcystis aeruginosa removal was carried out. The influences of sorbent concentration, stirring time, solution pH, and initial Microcystis aeruginosa concentration were investigated. The results indicate that the removal of Microcystis aeruginosa was the highest using 1 g/L of Mg/Al-LDO under pH 6-11 with stirring time of 1.5 h. Mg/Al-LDO had relatively high removal capacities at the initial Microcystis aeruginosa concentration range of 0.5~3.0 mg/L.
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2014, Vol. 32 
