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 mgL-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 mgL-1 removed 99% M. aeruginosa cells, but showed negligible efficacy in removing 0.05 mgL-1 MC-LR. At a higher dosage, 20 mgL-1 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 h-1 and 0.03 h-1 under 1 mgL-1 copper sulfate and 5 mgL-1 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.
All Science Journal Classification (ASJC) codes
- Geography, Planning and Development
- Aquatic Science
- Water Science and Technology