Abstract
Cyanobacterial bloom is one of the most urgent global environmental issues, which eventually could threaten human health and safety. Sonication treatment (ST) is a potential effective method to control cyanobacteria blooms in the field. Currently, the bottleneck of extensive application of ST is the difficulty to estimate the ST effect on the cyanobacterial cells and then determine suitable ST times in the field. In this study, cyanobacterial Microcystis samples sonicated at different times were first measured by a spectrophotometer to calculate the removal efficiency of Microcystis cells. Additionally, they were observed by TEM to reveal the intracellular structure changes of the cells. Then the samples were measured by an experimental setup based on polarized light scattering to measure the polarization parameters. Experimental results indicated that the polarization parameters can effectively characterize the intracellular structural changes of Microcystis cells with different ST times, which is quite consistent with the results for removal efficiency and TEM images. Further, the optimal ST time can be inferred by the polarization parameters. These results demonstrate that polarized light scattering can be a potentially powerful tool to explore suitable times for sonication treatment of cyanobacteria blooms.
Highlights
Introduction published maps and institutional affilNowadays, cyanobacterial blooms in eutrophic water bodies frequently cause deterioration of water quality [1], which can endanger the health of aquatic animals and plants as well as human beings [2], while at the same time increase the cost of water treatment [3]
We found that polarization parameters have the ability to characterize the collapse and recovery of gas vesicles of Microcystis cells after static pressure treatment or weak sonication treatment [17,21]
This study indicates that the polarized light scattering method may be a powerful tool to help sonication treatment control cyanobacterial Microcystis blooms in the field
Summary
Introduction published maps and institutional affilNowadays, cyanobacterial blooms in eutrophic water bodies frequently cause deterioration of water quality [1], which can endanger the health of aquatic animals and plants as well as human beings [2], while at the same time increase the cost of water treatment [3]. The main methods for controlling cyanobacterial blooms include shading, coagulation, filtration, algicides, and photolysis [5]. These treatment methods have played a certain role in algae removal. Some are expensive or complex, and some can cause secondary pollution [6]. The environment-friendly sonication treatment (ST) has attracted increasing attention in research of the cyanobacterial removal process, because of its special selectivity to cyanobacterial cells, simple operation, low cost, mild reaction conditions, fast reaction speed, and no secondary pollution [7].
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