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Water 2017, 9(4), 255; doi:10.3390/w9040255

Impacts of Hydrogen Peroxide and Copper Sulfate on the Control of Microcystis aeruginosa and MC-LR and the Inhibition of MC-LR Degrading Bacterium Bacillus sp.

1
Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan
2
Global Water Quality Research Center, National Cheng Kung University, Tainan 70955, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Wilhelm Püttmann
Received: 3 February 2017 / Revised: 22 March 2017 / Accepted: 1 April 2017 / Published: 5 April 2017
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Abstract

Laboratory batch experiments were carried out to evaluate the impacts of H2O2 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·L1 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·L1 removed 99% M. aeruginosa cells, but showed negligible efficacy in removing 0.05 mg·L1 MC-LR. At a higher dosage, 20 mg·L1 H2O2 led to 40% and 95% removal, respectively for MC-LR and M. aeruginosa cells. Copper sulfate and H2O2 were both lethal to Bacillus sp. population, with mortality rate constants of k = 0.04 h1 and 0.03 h1 under 1 mg·L1 copper sulfate and 5 mg·L1 H2O2, respectively. H2O2 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. View Full-Text
Keywords: algaecides; Bacillus sp.; biodegradation; copper sulfate; hydrogen peroxide; hydroxyl radicals; microcystin; Microcystis algaecides; Bacillus sp.; biodegradation; copper sulfate; hydrogen peroxide; hydroxyl radicals; microcystin; Microcystis
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Kansole, M.M.R.; Lin, T.-F. Impacts of Hydrogen Peroxide and Copper Sulfate on the Control of Microcystis aeruginosa and MC-LR and the Inhibition of MC-LR Degrading Bacterium Bacillus sp.. Water 2017, 9, 255.

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