Properties of CaO 2 for H 2 O 2 release and phosphate removal and its feasibility in controlling Microcystis blooms
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RESEARCH ARTICLE
Properties of CaO2 for H2O2 release and phosphate removal and its feasibility in controlling Microcystis blooms Yiwei Hu 1 & Liang Shen 1 & Xuanqi Ren 1 & Yonghong Bi 2 & Baowei Hu 1 & Binliang Wang 1 Received: 27 November 2019 / Accepted: 15 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Calcium peroxide (CP) has been widely applied in environmental remediation, but few studies have reported its application in controlling Microcystis blooms. To recognize its feasibility for mitigating Microcystis blooms, the properties of CP in terms of hydrogen peroxide (HP) release and phosphate removal were investigated at different CP doses, temperatures, and initial pH values. HP release kinetics followed the Higuchi model. Batch experiments conducted in this study suggested that the HP yield and release rate were positively correlated with the CP dose. Increasing temperature decreased the HP yield but accelerated the HP release rate. The phosphate removal kinetics were well simulated by the pseudo-second-order model. The batch experiments suggested that an increased CP dose enhanced the phosphate removal capacity, but it did not affect the phosphate removal rate. Moreover, increased temperature accelerated both phosphate removal capacity and rate. However, the initial pH of low-buffer-capacity solutions did not notably affect HP release and phosphate removal. According to laboratory experiments, HP released from CP could impair photosynthetic activity, resulting in Microcystis mortality. Furthermore, the reduced phosphate concentration in the solutions suggested that CP could facilitate the control of eutrophication, which directly reduced bloom formation. Hence, our results confirmed CP as a promising algicide for Microcystis bloom control, and it is worthwhile to develop novel methods for bloom mitigation based on CP. Keywords Calcium peroxide . Hydrogen peroxide . Phosphate removal . Microcystis bloom . Photosynthesis
Introduction Microcystis aeruginosa (M. aeruginosa) is the most common freshwater cyanobacterium. Climate change and anthropogenic activities promote the formation of M. aeruginosa blooms globally (Paerl and Otten 2013; Visser et al. 2016). The adverse effects of Microcystis blooms, including reduced irradiance, increased turbidity, elevated pH, and depleted oxygen, threaten the health of freshwater ecosystems (Francy et al. Responsible Editor: Vitor Manuel Oliveira Vasconcelos Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-09738-5) contains supplementary material, which is available to authorized users. * Binliang Wang [email protected] 1
School of Life Science, Shaoxing University, Shaoxing, Zhejiang 312000, China
2
State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
2016; Havens 2008; Otten et al. 2017; Shi et al. 2015; Xu et al. 2017). In addition, some Microcystis species contain variants of hepatotoxic mi
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