Effect of pre-chlorination on Microcystis aeruginosa cell integrity and microcystins removal

Autor(es)

de Souza, Alexander Ossanes ; Teramoto, Kazumi Kinoshita ; de Freitas, Paloma Nathane Nunes ; de Almeida, Eryka Costa ; Ferreira Filho, Sidney Seckler ; Pinto, Ernani

• Tipo de documento: Artigo Científico
• Fonte: URBAN WATER JOURNAL; v. 20, n. 8, p. 11-pg., 2023-06-01.

Resumo

High nutrient input into waterbodies increases potentially toxic cyanobacteria blooms. Pre-chlorination treatment is excellent for cyanobacterial cell inactivation and dissolved cyanotoxins removal in water supply sources. This study aims to evaluate the pre-chlorination effect treatment on Microcystis aeruginosa cell integrity and its hepatotoxins (microcystins, MC) release and degradation on a laboratory scale. Loss of cell integrity is observed with increasing chlorine concentration. The maximum cell permeability without cell disintegration occurs at 2.5 mg Cl-2 L-1. Degradations up to 70% and chlorophyll-a reductions over 70% are observed after 60 min exposure, with complete degradation at 2.5 and 3 mg Cl-2 L-1. However, chlorine (Cl-2) exposure over 40.66 mg min L-1 is required for microcystins MC-LR (i.e. radicals: leucine (L) and arginine (R)) and MC-RR (i.e. radicals: arginine and arginine) oxidation oxidation to concentrations below the legislation value for water potability. (AU)

• Processo FAPESP: 11/51950-3 - Prospecting volatile compounds produced by Brazilian cyanobacteria with allelopathic effects
• Beneficiário: Ernani Pinto Junior
• Modalidade de apoio: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE
• Processo FAPESP: 10/50739-4 - Remoção de interferentes endócrinos no tratamento de água para abastecimento público por processos de adsorção e nanofiltração
• Beneficiário: Sidney Seckler Ferreira Filho
• Modalidade de apoio: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE