Impacts of Hydrogen Peroxide and Copper Sulfate on the Control of <em>Microcystis aeruginosa</em> and MC-LR and the Inhibition of MC-LR Degrading Bacterium <em>Bacillus </em>sp
2017
Kansole, Michelline M. R. | Lin, Tsair-Fuh
Laboratory batch experiments were carried out to evaluate the impacts of H<inf>2</inf>O<inf>2</inf> and copper sulfate on M. aeruginosa PCC7820, microcystin-LR (MC-LR) and its degrading bacteria Bacillus sp., previously isolated from Hulupi Lake in Taiwan. The study shows that 3 mg·L−1 hydrogen peroxide removed only 9% M. aeruginosa within seven days of exposure, from an initial cell concentration of 2 × 106 cells/mL. With copper sulfate, a concentration of 2 mg·L−1 removed 99% M. aeruginosa cells, but showed negligible efficacy in removing 0.05 mg·L−1 MC-LR. At a higher dosage, 20 mg·L−1 H<inf>2</inf>O<inf>2</inf> led to 40% and 95% removal, respectively for MC-LR and M. aeruginosa cells. Copper sulfate and H<inf>2</inf>O<inf>2</inf> were both lethal to Bacillus sp. population, with mortality rate constants of k = 0.04 h−1 and 0.03 h−1 under 1 mg·L−1 copper sulfate and 5 mg·L−1 H<inf>2</inf>O<inf>2</inf>, respectively. H<inf>2</inf>O<inf>2</inf> is competitive in terms of cost, with a capability of degrading organic compounds with the assistance of ultraviolet (UV) light, and it may be considered as an alternative algaecide to copper sulfate in reservoirs for algae growth control.
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