Effect of three commercial algaecides on cyanobacteria and microcystin-LR: implications for drinking water treatment using activated carbon.

Autor: Koshigoe ASH; Department of Hydraulics and Sanitary Engineering, São Carlos School of Engineering, University of São Paulo, Av. Trabalhador São-Carlense, 400, Centro, SP, São Carlos, 13566-590, Brazil., Diniz V; Department of Analytical Chemistry, Institute of Chemistry, University of Campinas, Josué de Castro Street, Cidade Universitária, SP, Campinas, 13083-970, Brazil. viniciusdiniz994@gmail.com., Rodrigues-Silva C; Department of Analytical Chemistry, Institute of Chemistry, University of Campinas, Josué de Castro Street, Cidade Universitária, SP, Campinas, 13083-970, Brazil., Cunha DGF; Department of Hydraulics and Sanitary Engineering, São Carlos School of Engineering, University of São Paulo, Av. Trabalhador São-Carlense, 400, Centro, SP, São Carlos, 13566-590, Brazil.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2023 Feb; Vol. 30 (6), pp. 16003-16016. Date of Electronic Publication: 2022 Sep 30.
DOI: 10.1007/s11356-022-23281-5
Abstrakt: Toxic cyanobacterial blooms in aquatic ecosystems are associated to both public health and environmental concerns worldwide. Depending on the treatment technologies used, the removal capacity of cyanotoxins by drinking water treatment plants (DWTPs) is not sufficient to reach safe levels in drinking water. Likewise, controlling these blooms with algaecide may impair the efficiency of DWTPs due to the possible lysis of cyanobacterial cells and consequent release of cyanotoxins. We investigated the effects of three commercial algaecides (cationic polymer, copper sulfate, and hydrogen peroxide) on the growth parameters of the cyanobacterium Microcystis aeruginosa and the release of microcystin-LR (MC-LR). The potential interference of each algaecide on the MC-LR removal by adsorption on activated carbon (AC) was also tested through adsorption isotherms and kinetics experiments. Most algaecides significantly decreased the cell density and biovolume of M. aeruginosa, as well as increased the release of MC-LR. Interestingly, the presence of the algaecides in binary mixtures with MC-LR affected the adsorption of the cyanotoxin. Relevant adsorption parameters (e.g., maximum adsorption capacity, adsorption intensity, and affinity between MC-LR and AC) were altered when the algaecides were present, especially in the case of the cationic polymer. Also, the algaecides influenced the kinetics (e.g., by shifting the initial adsorption and the desorption constant), which may directly affect the design and operation of DWTPs. Our study indicated that algaecides can significantly impact the fate and the removal of MC-LR in DWTPs when the adsorption process is employed, with important implications for the management and performance of such facilities.
(© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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