Cyanobacterial control in natural water bodies by commercially available ultrasound: biomass reduction and cyanotoxin degradation
Low-frequency and low-intensity commercially available ultrasound to control algal growth in natural water bodies was studied. To evaluate the efficiency of ultrasound on cyanobacteria biomass removal and microcystins release and degradation a large-scale lab experiment with 150 L of high density M...
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University of Ljubljana Press (Založba Univerze v Ljubljani)
2025-04-01
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| Series: | Acta Biologica Slovenica |
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| Online Access: | https://journals.uni-lj.si/abs/article/view/21912 |
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| author | Aleksandra Krivograd Klemenčič Tina Eleršek |
| author_facet | Aleksandra Krivograd Klemenčič Tina Eleršek |
| author_sort | Aleksandra Krivograd Klemenčič |
| collection | DOAJ |
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Low-frequency and low-intensity commercially available ultrasound to control algal growth in natural water bodies was studied. To evaluate the efficiency of ultrasound on cyanobacteria biomass removal and microcystins release and degradation a large-scale lab experiment with 150 L of high density Microcystis aeruginosa suspension simulating natural conditions was conducted at different times of ultrasonication: 0, 15 min, 1 h, 5 h, 24 h, and 48 h. The first effect of ultrasonication on biomass reduction was evident at 24 h of continuous ultrasonication with the highest removal rates of 97% and 93% for cell count and chlorophyll a, respectively, at 48 h of continuous ultrasound treatment. The growth inhibition test showed biomass reduction in the samples exposed to ultrasonication for at least one hour with increasing effect from here on. The most efficient in M. aeruginosa reduction was the longest tested ultrasound treatment of 48 h with the growth inhibition of 96%, followed by 24-h ultrasound treatment with 50%, and 5-h ultrasound treatment with 17% growth inhibition after 9 days of incubation. At five hours of ultrasonication a sharp increase in dissolved microcystins in the medium was observed as a result of ultrasound induced stress followed by drop of dissolved microcystins under detection limit at 24 h of continuous ultrasonication. This study showed that commercially available ultrasound devices are highly efficient for cyanobacterial bloom control already at relatively low times of exposure, one to two days, with no health risks due to increased dissolved toxins after continuous ultrasound treatment for 24 h or more.
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| format | Article |
| id | doaj-art-7df933d8931c4eef8fae8480e353113e |
| institution | OA Journals |
| issn | 1854-3073 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | University of Ljubljana Press (Založba Univerze v Ljubljani) |
| record_format | Article |
| series | Acta Biologica Slovenica |
| spelling | doaj-art-7df933d8931c4eef8fae8480e353113e2025-08-20T02:29:00ZengUniversity of Ljubljana Press (Založba Univerze v Ljubljani)Acta Biologica Slovenica1854-30732025-04-0168310.14720/abs.68.3.21912Cyanobacterial control in natural water bodies by commercially available ultrasound: biomass reduction and cyanotoxin degradationAleksandra Krivograd Klemenčič0Tina Eleršek1University of Ljubljana, Faculty of Civil and Geodetic Engineering, Institute for Sanitary Engineering, Hajdrihova 28, SI-1000 Ljubljana, SloveniaNational Institute of Biology, Department of Genetic Toxicology and Cancer Biology, Večna pot 121, SI-1000 Ljubljana, Slovenia Low-frequency and low-intensity commercially available ultrasound to control algal growth in natural water bodies was studied. To evaluate the efficiency of ultrasound on cyanobacteria biomass removal and microcystins release and degradation a large-scale lab experiment with 150 L of high density Microcystis aeruginosa suspension simulating natural conditions was conducted at different times of ultrasonication: 0, 15 min, 1 h, 5 h, 24 h, and 48 h. The first effect of ultrasonication on biomass reduction was evident at 24 h of continuous ultrasonication with the highest removal rates of 97% and 93% for cell count and chlorophyll a, respectively, at 48 h of continuous ultrasound treatment. The growth inhibition test showed biomass reduction in the samples exposed to ultrasonication for at least one hour with increasing effect from here on. The most efficient in M. aeruginosa reduction was the longest tested ultrasound treatment of 48 h with the growth inhibition of 96%, followed by 24-h ultrasound treatment with 50%, and 5-h ultrasound treatment with 17% growth inhibition after 9 days of incubation. At five hours of ultrasonication a sharp increase in dissolved microcystins in the medium was observed as a result of ultrasound induced stress followed by drop of dissolved microcystins under detection limit at 24 h of continuous ultrasonication. This study showed that commercially available ultrasound devices are highly efficient for cyanobacterial bloom control already at relatively low times of exposure, one to two days, with no health risks due to increased dissolved toxins after continuous ultrasound treatment for 24 h or more. https://journals.uni-lj.si/abs/article/view/21912algae controlcyanobacteriaultrasoundcyanotoxinsMicrocystis aeruginosa |
| spellingShingle | Aleksandra Krivograd Klemenčič Tina Eleršek Cyanobacterial control in natural water bodies by commercially available ultrasound: biomass reduction and cyanotoxin degradation Acta Biologica Slovenica algae control cyanobacteria ultrasound cyanotoxins Microcystis aeruginosa |
| title | Cyanobacterial control in natural water bodies by commercially available ultrasound: biomass reduction and cyanotoxin degradation |
| title_full | Cyanobacterial control in natural water bodies by commercially available ultrasound: biomass reduction and cyanotoxin degradation |
| title_fullStr | Cyanobacterial control in natural water bodies by commercially available ultrasound: biomass reduction and cyanotoxin degradation |
| title_full_unstemmed | Cyanobacterial control in natural water bodies by commercially available ultrasound: biomass reduction and cyanotoxin degradation |
| title_short | Cyanobacterial control in natural water bodies by commercially available ultrasound: biomass reduction and cyanotoxin degradation |
| title_sort | cyanobacterial control in natural water bodies by commercially available ultrasound biomass reduction and cyanotoxin degradation |
| topic | algae control cyanobacteria ultrasound cyanotoxins Microcystis aeruginosa |
| url | https://journals.uni-lj.si/abs/article/view/21912 |
| work_keys_str_mv | AT aleksandrakrivogradklemencic cyanobacterialcontrolinnaturalwaterbodiesbycommerciallyavailableultrasoundbiomassreductionandcyanotoxindegradation AT tinaelersek cyanobacterialcontrolinnaturalwaterbodiesbycommerciallyavailableultrasoundbiomassreductionandcyanotoxindegradation |