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Identification and assessment of water quality risks associated with sludge supernatant recycling in the presence of cyanobacteria.

Dreyfus, Jennifer; Monrolin, Yannick; Pestana, Carlos J.; Reeve, Petra J.; Sawade, Emma; Newton, Kelly; Ho, Lionel; Chow, Christopher W.K.; Newcombe, Gayle

Authors

Jennifer Dreyfus

Yannick Monrolin

Petra J. Reeve

Emma Sawade

Kelly Newton

Lionel Ho

Christopher W.K. Chow

Gayle Newcombe



Abstract

This study focussed on the fate of cyanobacteria cells and associated metabolites during the sludge management processes that follow the conventional drinking water treatment train. The topic is of importance, as the release of metabolites during sludge treatment may pose a risk to water quality if supernatant is recycled to the head of the plant. The study of the kinetics of cell damage and metabolite release into the supernatant is complicated by simultaneous and rapid natural removal processes. In this study, the release of organic material from cyanobacterial sludge was monitored simultaneously with secondary metabolites (Microcystins (MCs), cylindrosperopsin (CYN), and geosmin (GSM)) as an additional parameter to aid in understanding the range of processes occurring in sludge. Only GSM produced by Dolichospermum circinale was found to represent a low risk, as the compound is readily degraded. In contrast, the metabolites CYN and MC were shown to increase in concentration during simulated sludge treatment, suggesting that this could occur within full scale sludge treatment facilities with a range of cyanobacteria species, metabolites and water quality. A generic risk matrix was developed, incorporating the type of cyanobacteria, metabolite production, and the treatment.

Citation

DREYFUS, J., MONROLIN, Y., PESTANA, C.J., REEVE, P.J., SAWADE, E., NEWTON, K., HO, L., CHOW C.W.K. and NEWCOMBE, G. 2016. Identification and assessment of water quality risks associated with sludge supernatant recycling in the presence of cyanobacteria. Aqua: journal of water supply: research and technology [online], 65(6), pages 441-452. Available from: https://doi.org/10.2166/aqua.2016.030

Journal Article Type Article
Acceptance Date Jul 15, 2016
Online Publication Date Aug 13, 2016
Publication Date Sep 1, 2016
Deposit Date May 31, 2021
Publicly Available Date May 31, 2021
Journal Journal of Water Supply: Research and Technology-Aqua
Print ISSN 0003-7214
Electronic ISSN 1605-3974
Publisher IWA Publishing
Peer Reviewed Peer Reviewed
Volume 65
Issue 6
Pages 441-452
DOI https://doi.org/10.2166/aqua.2016.030
Keywords Cyanobacteria; Cyanotoxins; Dissolved organic carbon (DOC); Sludge storage; Water treatment
Public URL https://rgu-repository.worktribe.com/output/1148111

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