Effect of low-frequency ultrasound on growth inhibition and cell structure of cyanobacteria
Cyanobacterial blooms is a prominent water environmental problem worldwide.Ultrasonic algae control technology has advantages of simple operation,cost efficiency and no secondary pollution,among which low frequency ultrasonic is the main application direction.To explore the optimal operating parameters of low-frequency ultrasound for algal control and its impact on water quality safety,the inhibitory effect of low-frequency ultrasound on Microcystis aeruginosa at different frequency ranges,treatment times,and action modes were studied.The sensitivity of different cyanobacterial species to low-frequency ultrasound treatment was compared,and the changes in cellular morphology,structure,and the release of microcystin after low-frequency ultrasound treatment were analyzed.The results showed that for M.aeruginosa,the optimal frequency range was 20～35 kHz(power density of 0.008 W·mL-1),with action mode of 2 times,each time lasting for 3 min with a 24-hour interval,the removal rate was approximately 93.55%.Spherical unicellular cyanobacterial species(Chroococcus sp.)was more sensitive to low-frequency sonication compared to filamentous cyanobacterial species(Phormidium sp.and Oscillatoria sp.).After ultrasonic treatment,the surface of M.aeruginosa cells became wrinkled,and the intracellular photosynthetic lamellae were damaged,but the cell remained intact,and the release of microcystin was not detected.The above results showed that low-frequency ultrasound could effectively control algae and ensure water quality safety at the same time.
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