Impact of chlorination and pre-ozonation on disinfection by-products formation from aqueous suspensions of cyanobacteria: Microcystis aeruginosa, Anabaena aequalis and Oscillatoria tenuis

Bernat-Quesada, Francisco; Álvaro, Mercedes; Garcı́a, Hermenegildo; Navalón, Sergio

doi:10.1016/j.watres.2020.116070

Cited by 14 publications

(2 citation statements)

References 43 publications

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“…Legionella prevalent in MLS and MDS encompasses approximately 60 species, half human pathogens . Reusing such reclaimed water elevates the risk of Legionnaires’ disease. , Additionally, algal blooms triggered by light exposure introduce supplementary biosecurity risks and intensify disinfection challenges . The utilization of reclaimed water stored in open-air conditions (mainly Pseudomonas and Chlamydia ) and at high temperatures (mainly Sphingomonas , Klebsiella , and Acinetobacter ) presents a potential hazard to human health. − This may induce inflammation and lesions, resulting in substantial medical and social burdens, leading to economic losses, and posing a significant challenge to public health.…”

Section: Discussionmentioning

confidence: 99%

Reconsidering the Rationality of Ultrafiltration as the Ultimate Safeguard for Reclaimed Water Biosafety: Unexpected Risks Arise under Different Storage Conditions

Cui,

Ding,

et al. 2024

ACS EST Water

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Ultrafiltration, an advanced process for producing biologically safe reclaimed water, has confronted challenges from bacterial regrowth. We conducted a comprehensive investigation into the biosafety risks of ultrafiltration-treated reclaimed water under five distinct storage conditions, considering temperature variations, airborne bacterial invasion, and light. Although ultrafiltration removed over 97% of the bacterial load, bacterial regrowth occurred during storage. Elevated temperatures resulted in the highest heterotrophic plate count (HPC), while lower temperatures favored increased total cell count (TCC). Notably, lower temperatures facilitated a surge in the number of potential pathogenic bacteria. Light exposure also elevated the potential pathogenic bacteria. Surprisingly, high temperatures posed minimal biosafety risk. While airborne bacterial invasion insignificantly affected potential pathogenic bacterial count, it constituted 67 ± 4% of total regrowth bacteria, with membrane breakthrough bacteria comprising the remaining 33 ± 4%, as revealed by SourceTracker. The impact of storage conditions on the bacterial community structure varied, with temperature exerting the most significant effect. Correlation analysis affirmed the potential of UV254 and total fluorescence intensity as alternative indicators for HPC, and polysaccharide content emerged as a suitable substitute indicator for potential pathogenic bacterial count. Future endeavors should prioritize the development of integrated ultrafiltration processes designed to inhibit pathogen regrowth in reclaimed water treatment.

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Section: Discussionmentioning

confidence: 99%

Reconsidering the Rationality of Ultrafiltration as the Ultimate Safeguard for Reclaimed Water Biosafety: Unexpected Risks Arise under Different Storage Conditions

Cui,

Ding,

et al. 2024

ACS EST Water

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“…Pre-oxidation is usually applied to intensify the coagulation process. The pre-oxidation process can remove part of the organic matter in water, thereby changing the structural characteristics of the NOM [ 18 , 19 ]. KMnO 4 is a conventional chemical for pre-oxidation that is effective in removing trace organic contaminants and TCM precursors [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Correlation Analysis of the Carboxyl and Carbonyl Groups of Natural Organic Matter and the Formation Potential of Trihalomethanes and Chloral Hydrate

Zhu

Shen

et al. 2022

Molecules

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Natural organic matter (NOM) has always been considered the main precursor of disinfection by-products (DBPs) during the chlorine disinfection of drinking water. This research focuses on investigating the correlation between the functional group (carboxyl and carbonyl groups) content of NOM and the formation of trichloromethane (TCM) and chloral hydrate (CH). The quantitative determination of carboxyl groups, carbonyl groups, TCM, and CH were conducted during the drinking water treatment processes with different coagulant dosages and with/without pre-oxidation by KMnO4 or NaClO. The most appropriate coagulant for the removal of conventional components was polyaluminum chloride (PAC), and the dosage was 110 mg/L. Up to 43.7% and 14.5% of the carboxyl and carbonyl groups, respectively, were removed through the coagulation and sedimentation processes, which can be enhanced by increasing PAC dosage. The filtration process further increased the removal rates of these two functional groups to 59.8% and 33.5%, respectively. The formation potential of the TCM and CH decreased as the PAC dosage increased. Pre-oxidation by KMnO4 (0.8–1.0 mg/L) effectively controlled the formation of DBPs while increasing the carboxyl and carbonyl group content. Pre-oxidation by NaClO decreased the formation of TCM rather than CH, and a suitable amount (0.5–1.0 mg/L) decreased the carboxyl and carbonyl groups. It was found that there was a good linear correlation between carboxyl groups and TCM and CH. The linear fit R2 values of the carboxyl groups to TCM and CH were 0.6644 and 0.7957, respectively. The linear fit R2 values of the carbonyl groups to TCM and CH were 0.5373 and 0.7595, respectively.

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Advances and challenges in the technologies for cyanobacterial cells removal in drinking water treatment

Xu,

Yang,

Pang

et al. 2024

Chemosphere

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Impact of chlorination and pre-ozonation on disinfection by-products formation from aqueous suspensions of cyanobacteria: Microcystis aeruginosa, Anabaena aequalis and Oscillatoria tenuis

Cited by 14 publications

References 43 publications

Reconsidering the Rationality of Ultrafiltration as the Ultimate Safeguard for Reclaimed Water Biosafety: Unexpected Risks Arise under Different Storage Conditions

Reconsidering the Rationality of Ultrafiltration as the Ultimate Safeguard for Reclaimed Water Biosafety: Unexpected Risks Arise under Different Storage Conditions

Correlation Analysis of the Carboxyl and Carbonyl Groups of Natural Organic Matter and the Formation Potential of Trihalomethanes and Chloral Hydrate

Advances and challenges in the technologies for cyanobacterial cells removal in drinking water treatment

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