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| DOI | Trouver le DOI : https://doi.org/10.3390/w14040537 |
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| Auteur | Rechercher : Jalili, FarhadIdentifiant ORCID : https://orcid.org/0000-0001-8680-623X; Rechercher : Trigui, Hana; Rechercher : Maldonado, Juan Francisco Guerra; Rechercher : Dorner, Sarah; Rechercher : Zamyadi, Arash; Rechercher : Shapiro, B. JesseIdentifiant ORCID : https://orcid.org/0000-0001-6819-8699; Rechercher : Terrat, Yves; Rechercher : Fortin, Nathalie1; Rechercher : Sauvé, SébastienIdentifiant ORCID : https://orcid.org/0000-0001-8584-1690; Rechercher : Prévost, Michèle |
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| Affiliation | - Conseil national de recherches Canada. Énergie, les mines et l'environnement
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| Bailleur de fonds | Rechercher : Genome Canada; Rechercher : Algal Blooms, Treatment, Risk Assessment, Prediction, and Prevention through Genomics |
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| Format | Texte, Article |
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| Sujet | cyanobacteria; shotgun metagenomic sequencing; sludge; drinking water treatment plant; oxidation; storage; stagnation; microcystins |
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| Résumé | 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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| Date de publication | 2022-02-11 |
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| Maison d’édition | MDPI |
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| Licence | |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Identificateur | w14040537 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 9e7c70ed-bc44-4531-8c67-1d67f7e87a09 |
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| Enregistrement créé | 2023-07-24 |
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| Enregistrement modifié | 2024-08-16 |
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