Comparison of different algicides on growth of <i>Microcystis aeruginosa</i> and microcystin release, as well as its removal pathway in riverways

doi:10.1007/s11783-017-0940-8

Front. Environ. Sci. Eng.

2017, Vol. 11

Issue (6) : 3 https://doi.org/10.1007/s11783-017-0940-8

RESEARCH ARTICLE

Comparison of different algicides on growth of Microcystis aeruginosa and microcystin release, as well as its removal pathway in riverways

Naiyu Wang, Kai Wang, Can Wang(

)

School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China

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Abstract

Aluminum silicate is the most effective algicide on Microcystis aeruginosa control.

Algicides increased MC-LR concentration by disrupting M. aeruginosa cells.

Acute biotoxicity and extracellular MC-LR concentration were positively correlated.

MC-LR was mainly removed by benthal sludge and UV-rays under natural conditions.

Eutrophication with a large number of Microcystis aeruginosa commonly occurs worldwide, thereby threatening the aquatic ecosystem and human health. In this study, four kinds of algicides were tested to explore their influence on cell density and chlorophyll-a of M. aeruginosa. Results showed that aluminum silicate agent, which inhibited more than 90% cell growth compared with the control group, demonstrated the strongest inhibition effect immediately on M. aeruginosa growth. Furthermore, the production and release of microcystin (MC)-LR were investigated. Aluminum silicate, CuSO₄, and Emma-11 were more effective than pyrogallic acid in disrupting the cells of M. aeruginosa, thereby increasing the extracellular MC-LR concentration. Aluminum silicate caused the highest extracellular MC-LR concentration of more than 45 mg·L⁻¹. Biotoxicity was also detected to evaluate the environmental risks of MC-LR release, which were related to the usages of different algicides. Extracellular MC-LR concentration mostly increased when the biotoxicity of algae solution increased. The experiments were also designed to reveal the effects of physical conditions in riverways, such as natural sunlight, aeration and benthal sludge, on MC-LR degradation. These findings indicated that UV rays in sunlight, which can achieve a MC-LR removal efficiency of more than 15%, played an important role in MC-LR degradation. Among all the physical pathways of MC-LR removal, benthal sludge adsorption presented the optimal efficiency at 20%.

Keywords Microcystis aeruginosa MC-LR release Algicides MC-LR degradation Biotoxicity

Corresponding Author(s): Can Wang

Issue Date: 10 May 2017

Cite this article:

Naiyu Wang,Kai Wang,Can Wang. Comparison of different algicides on growth of Microcystis aeruginosa and microcystin release, as well as its removal pathway in riverways[J]. Front. Environ. Sci. Eng., 2017, 11(6): 3.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-017-0940-8
https://academic.hep.com.cn/fese/EN/Y2017/V11/I6/3

Fig.1 Variation tendency of cell density of M. aeruginosa after the treatment of different algicides

Fig.2 Influence of different algicides on chlorophyll-a

Fig.3 Variation of total MC-LR (a) and extracellular MC-LR (b)

Fig.4 Effect of different algicides on biological toxicity and extracellular MC-LR concentration

Fig.5 Degration of MC-LR by natural sunlight (a), UV-rays (b), aeration (c) and benthal sludge (d)

Fig.6 Removal pathways of MC-LR in riverways under natural conditions

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