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Toxins 2014, 6(1), 152-167; doi:10.3390/toxins6010152

Fates of Microcystis aeruginosa Cells and Associated Microcystins in Sediment and the Effect of Coagulation Process on Them

1
Department of Environmental Science and Technology, Wuhan University of Technology, Wuhan 430070, China
2
State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China
*
Authors to whom correspondence should be addressed.
Received: 1 November 2013 / Revised: 21 December 2013 / Accepted: 23 December 2013 / Published: 30 December 2013
(This article belongs to the Collection Marine and Freshwater Toxins)
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Abstract

During toxic Microcystis aeruginosa blooms, large amounts of cells can enter sediment through natural settlement, and coagulation treatment used to control water blooms can enhance the accumulation of cells. However, the current understanding of the fates of these cells and associated microcystins (MCs), as well as the effect of coagulation treatment on these factors, is limited. The results of the present study show that Microcystis aeruginosa cells in sediment were steadily decomposed under experimental conditions, and that they completely disappeared within 28 days. The major MCs released from settled cells were immediately degraded in sediment, and microbial degradation may be the main mechanism involved in this process. Coagulation treatment with PAC (polyaluminium chloride) + sepiolite can efficiently remove Microcystis aeruginosa cells from the water column and prevent their re-invasion. Furthermore, coagulation treatment with PAC + sepiolite had no significant effect on the release and decomposition of MCs and, thus, will not enhance the MCs pollution. However, coagulation treatment can accelerate the nutrient cycle by enhancing the settlement of cells. More attention should be paid to the effect on nutrient cycle when coagulation treatment is used for restoration of aquatic ecosystems. View Full-Text
Keywords: Microcystis aeruginosa; microcystins; coagulation; degradation; water bloom Microcystis aeruginosa; microcystins; coagulation; degradation; water bloom
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Chen, X.; Xiang, H.; Hu, Y.; Zhang, Y.; Ouyang, L.; Gao, M. Fates of Microcystis aeruginosa Cells and Associated Microcystins in Sediment and the Effect of Coagulation Process on Them. Toxins 2014, 6, 152-167.

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