Metagenomic study to evaluate functional capacity of a cyanobacterial bloom during oxidation

Moradinejad, Saber; Trigui, Hana; Maldonado, Juan; Shapiro, Ben; Terrat, Yves; Sauvé, Sébastien; Fortin, Nathalie; Zamyadi, Arash; Dorner, Sarah; Prévost, Michèle

doi:10.1016/j.ceja.2021.100151

Cited by 5 publications

(4 citation statements)

References 87 publications

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“…However, this confirms that post-chlorination was not always effective in reducing CB cells as shown by recent work. 34 Turbidity in lake water can be associated with inorganic non-algal sources (resuspension of sediments, runoff, etc.) and phytoplankton associated turbidity caused by both algae and cyanobacteria.…”

Section: Resultsmentioning

confidence: 99%

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Evidence-based framework to use in situ phycocyanin readings for cyanobacterial risk assessment within drinking water treatment plants

Ma,

Dorner,

Prévost

2024

Environ. Sci.: Water Res. Technol.

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Section: Resultsmentioning

confidence: 99%

“…However, this confirms that post-chlorination was not always effective in reducing CB cells as shown by recent work. 34…”

Section: Resultsmentioning

confidence: 99%

Evidence-based framework to use in situ phycocyanin readings for cyanobacterial risk assessment within drinking water treatment plants

Ma,

Dorner,

Prévost

2024

Environ. Sci.: Water Res. Technol.

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“…Primers for the detection of the mcyD gene (microcystin production) were: mcyD(KS)F1: 5 -TGG GGATGGACTCTCTCACTTC-3 and mcyD(KS)R1:5 GGCTTCAACATTCGGAAAACG-3 [47]. The details of the analysis are presented in Moradinejad et al [48].…”

Section: Droplet Digital Pcr (Ddpcr)mentioning

confidence: 99%

Oxidation to Control Cyanobacteria and Cyanotoxins in Drinking Water Treatment Plants: Challenges at the Laboratory and Full-Scale Plants

Jalili

Trigui

Maldonado

et al. 2022

Water

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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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“…However, it is reported that pre-oxidation may cause cyanobacteria cell damage (decrease in cell viability) and cell-bound cyanotoxin release [35][36][37]. The level of cell lysis/damage and cyanotoxin degradation/release following pre-oxidation depends on the oxidation exposure (CT as residual concentration x contact time), and it is the driver to find the best pre-oxidation practice against cyanobacteria and cyanotoxins [38,39].…”

Section: Introductionmentioning

confidence: 99%

Evidence-Based Framework to Manage Cyanobacteria and Cyanotoxins in Water and Sludge from Drinking Water Treatment Plants

Jalili

Moradinejad

Zamyadi

et al. 2022

Toxins

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Freshwater bodies and, consequently, drinking water treatment plants (DWTPs) sources are increasingly facing toxic cyanobacterial blooms. Even though conventional treatment processes including coagulation, flocculation, sedimentation, and filtration can control cyanobacteria and cell-bound cyanotoxins, these processes may encounter challenges such as inefficient removal of dissolved metabolites and cyanobacterial cell breakthrough. Furthermore, conventional treatment processes may lead to the accumulation of cyanobacteria cells and cyanotoxins in sludge. Pre-oxidation can enhance coagulation efficiency as it provides the first barrier against cyanobacteria and cyanotoxins and it decreases cell accumulation in DWTP sludge. This critical review aims to: (i) evaluate the state of the science of cyanobacteria and cyanotoxin management throughout DWTPs, as well as their associated sludge, and (ii) develop a decision framework to manage cyanobacteria and cyanotoxins in DWTPs and sludge. The review identified that lab-cultured-based pre-oxidation studies may not represent the real bloom pre-oxidation efficacy. Moreover, the application of a common exposure unit CT (residual concentration × contact time) provides a proper understanding of cyanobacteria pre-oxidation efficiency. Recently, reported challenges on cyanobacterial survival and growth in sludge alongside the cell lysis and cyanotoxin release raised health and technical concerns with regards to sludge storage and sludge supernatant recycling to the head of DWTPs. According to the review, oxidation has not been identified as a feasible option to handle cyanobacterial-laden sludge due to low cell and cyanotoxin removal efficacy. Based on the reviewed literature, a decision framework is proposed to manage cyanobacteria and cyanotoxins and their associated sludge in DWTPs.

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Metagenomic study to evaluate functional capacity of a cyanobacterial bloom during oxidation

Cited by 5 publications

References 87 publications

Evidence-based framework to use in situ phycocyanin readings for cyanobacterial risk assessment within drinking water treatment plants

Evidence-based framework to use in situ phycocyanin readings for cyanobacterial risk assessment within drinking water treatment plants

Oxidation to Control Cyanobacteria and Cyanotoxins in Drinking Water Treatment Plants: Challenges at the Laboratory and Full-Scale Plants

Evidence-Based Framework to Manage Cyanobacteria and Cyanotoxins in Water and Sludge from Drinking Water Treatment Plants

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