| Download | - View final version: Oxidation to control cyanobacteria and cyanotoxins in drinking water treatment plants: challenges at the laboratory and full-scale plants (PDF, 3.0 MiB)
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| DOI | Resolve DOI: https://doi.org/10.3390/w14040537 |
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| Author | Search for: Jalili, FarhadORCID identifier: https://orcid.org/0000-0001-8680-623X; Search for: Trigui, Hana; Search for: Maldonado, Juan Francisco Guerra; Search for: Dorner, Sarah; Search for: Zamyadi, Arash; Search for: Shapiro, B. JesseORCID identifier: https://orcid.org/0000-0001-6819-8699; Search for: Terrat, Yves; Search for: Fortin, Nathalie1; Search for: Sauvé, SébastienORCID identifier: https://orcid.org/0000-0001-8584-1690; Search for: Prévost, Michèle |
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| Affiliation | - National Research Council of Canada. Energy, Mining and Environment
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| Funder | Search for: Genome Canada; Search for: Algal Blooms, Treatment, Risk Assessment, Prediction, and Prevention through Genomics |
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| Format | Text, Article |
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| Subject | cyanobacteria; shotgun metagenomic sequencing; sludge; drinking water treatment plant; oxidation; storage; stagnation; microcystins |
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| Abstract | The impact of oxidation on mitigation of cyanobacteria and cyanotoxins in drinking water treatment sludge was investigated at the laboratory and treatment plant scales. Two common oxidants, KMnO₄ (5 and 10 mg/L) and H₂O₂ (10 and 20 mg/L) were applied under controlled steady-state conditions. Non-oxidized and oxidized sludge was left to stagnate in the dark for 7 to 38 days. Controlled laboratory trials show that KMnO₄ and H₂O₂ decreased cell counts up to 62% and 77%, respectively. The maximum total MC level reduction achieved after oxidation was 41% and 98% using 20 mg/L H₂O₂ and 10 mg/L KMnO₄, respectively. Stagnation caused cell growth up to 2.6-fold in 8 out of 22 oxidized samples. Microcystin (MC) producer orders as Chroococcales and Synechococcales were persistent while Nostocales was sensitive to combined oxidation and stagnation stresses. In parallel, two on-site shock oxidation treatments were performed in the DWTP’s sludge holding tank using 10 mg/L KMnO₄. On-site shock oxidation decreased taxonomic cell counts by up to 43% within 24 h. Stagnation preceded by on-site shock oxidation could increase total cell counts by up to 55% as compared to oxidation alone. The increase of cell counts and mcyD gene copy numbers during stagnation revealed the impact of oxidation/stagnation on cyanobacterial cell growth. These findings show the limitations of sludge oxidation as a strategy to manage cyanobacteria and cyanotoxins in sludge and suggest that alternative approaches to prevent the accumulation and mitigation of cyanobacteria in sludge should be considered. |
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| Publication date | 2022-02-11 |
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| Publisher | MDPI |
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| Language | English |
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| Peer reviewed | Yes |
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| Identifier | w14040537 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 9e7c70ed-bc44-4531-8c67-1d67f7e87a09 |
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| Record created | 2023-07-24 |
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| Record modified | 2024-01-23 |
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