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Harmful cyanobacterial blooms have occurred worldwide over the past several decades, these blooms cause a series of problems not only on drinking water supplies, food webs, but also on the sustainability of freshwater ecosystems. In this study, we constructed a liquid-phase high voltage discharge system to evaluate the effect of high voltage discharge on the growth of Microcystis aeruginosa. Experimental results showed that when the algae initial concentration was 1×10 cells/ml, there was almost no change in optical density immediately after the electrical discharge, which presents the cell concentration of Microcystis aeruginosa was not changed immediately. While during the cell cultivating time after the discharge for five days, the cell concentration was gradually decreased along with the cultivating days compared with the control group. And among the treated groups, the 5kV group and the 4kV groups  ́effect was superior than the 3kV groups(P<0.05), but there was no differences between the 5kV groups and the 4kV groups(P>0.05). While the microcystin-LR(MC-LR) content was different between the 5kV groups and the 4kV groups(P<0.05) after discharge for 5days detected by high performance liquid phase (HPLC). These results implicated that the growth inhibition of M. aeruginosa was mainly caused by electrical discharge process, and it made the algal cells lose ability to survive, demonstrating the considerable potential of such an alternative process for efficient water purification.

Inactivation of Microcystis Aeruginosa by High Voltage Electrical Discharges