Authors: CB Park S Baik S Kim JW Choi SH Lee Y J Kim
Publish Date: 2017/01/09
Volume: 14, Issue: 5, Pages: 923-932
Abstract
This study is focused on the use of ultrasound to disrupt Microcystis aeruginosa growth with consideration for the gap between laboratoryscale experiment and field application Laboratoryscale sonication systems with different frequencies ie 20 584 869 and 1137 kHz for 30 min at 10min intervals were conducted to investigate their effectiveness at disrupting M aeruginosa growth The toxicological effect of sonicated M aeruginosa including microcystinLR was also evaluated using a Daphnia magna acute toxicity test High frequencies 869 and 1137 kHz resulted in more than a 60 reduction of cells after 30 min of sonication Low to middle frequencies 20 and 584 kHz only showed a 30 reduction of cells after 30 min of sonication High frequencies also led to the inactivation of cell proliferation during M aeruginosa regrowth due to cellular destruction and finally cell death However the concentration of microcystinLR and the potential adverse effects of M aeruginosa on D magna could not be controlled using ultrasonic frequencies Therefore our results suggest that ultrasonic frequencies between 869 and 1137 kHz are effective at controlling bloom formation in M aeruginosa and the regrowth of M aeruginosa after sonication but not at controlling microcystinLR concentrations and its adverse effects on D magna Consequently a combined purification technology to reduce the cyanotoxins such as microcystinLR rather than ultrasonic frequency alone will be needed to control M aeruginosa growth and its toxicity levels in the aquatic environment
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