Robust evaluation of performance monitoring options for ozone disinfection in water recycling using Bayesian analysis

Carvajal, Gustavo; Branch, Amos; Philipp, Michel; Sisson, Scott A.; Roser, David; Drewes, Jörg E.; Khan, Stuart J.

doi:10.1016/j.watres.2017.07.079

Cited by 14 publications

(4 citation statements)

References 24 publications

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“…The trend in WW matched that reported for different WWs by Gamage et al (2013) (SI, Figure S5) (Gamage et al, 2013). In previous studies (Carvajal et al, 2017;Gamage et al, 2013;Gerrity et al, 2012), the relationship between UV 254 abatement and the specific ozone dose was described by a power function, and such a function also fits the data reported herein.…”

Section: Resultssupporting

confidence: 88%

“…Detection limits were determined according to the maximal measurable inactivation in each individual experiment. Parameter estimates were assumed to be normally distributed, and prior knowledge of mean values and standard deviations obtained from literature, were included (Carvajal et al, 2017;Gamage et al, 2013). When no prior knowledge was available, a noninformative normal prior or flat prior were used for the mean, and a uniform flat prior for the standard deviation.…”

Section: Experiments With Proxies Experiments With Proxies Experiment...mentioning

confidence: 99%

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Proxies to monitor the inactivation of viruses by ozone in surface water and wastewater effluent

et al. 2019

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Section: Resultssupporting

confidence: 88%

Section: Experiments With Proxies Experiments With Proxies Experiment...mentioning

confidence: 99%

Proxies to monitor the inactivation of viruses by ozone in surface water and wastewater effluent

et al. 2019

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“…Lee et al (2016) applied FCM analysis with fluorescence staining to analyze the membrane damage or DNA damage of bacteria caused under different O 3 /DOC mass ratios, but the effect of • OH on DNA damage at higher O 3 /DOC mass ratios was not studied yet. It should be noted that the online measurements of O 3 and DOC concentrations require expensive instruments, and the consumed O 3 calculated from the differential O 3 concentration between inlet and outlet gas might have a higher value than the true consumed O 3 (Carvajal et al, 2017).…”

Section: ; Vonmentioning

confidence: 99%

“…In comparison with extensive studies focusing on the oxidation performance, few studies have applied the spectroscopic indicator frameworks for estimation of disinfection efficiency. Gerrity et al (2012), Gamage et al (2013) and Carvajal et al (2017) evaluated the ΔUVA254 or ΔTF as indicators for predicting inactivation of seeded or autochthonous E. coli, MS2 Bacteriophage and Bacillus subtilis Spores using cultivation-based methods, respectively. However, the information on the correlations between spectroscopic indicators and inactivation of autochthonous bacterial communities or damage of DNA is not available yet.…”

Section: ; Vonmentioning

confidence: 99%

Applying UV absorbance and fluorescence indices to estimate inactivation of bacteria and formation of bromate during ozonation of water and wastewater effluent

Cheng

Cai

et al. 2018

Water Research

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Ozone is an effective oxidant and disinfectant commonly used for elimination of micropollutants and inactivation of resistant microbes. However, undesirable oxidation/disinfection byproducts such as bromate might form during ozonation. In this study, the UV absorbance and fluorescence indices were applied as surrogate indicators for predicting the inactivation of bacteria and formation of bromate during ozonation of water and wastewater effluents. The inactivation efficiencies of lab-cultured Escherichia coli (E. coli) and autochthonous bacteria were measured by plating (for E. coli only) and flow cytometry with fluorescence staining. During ozonation of E. coli spiked into wastewater effluents (∼10 cell/mL), the priority of inactivation efficiency determined by different cell viability methods were in the order of CFU > membrane damage > DNA damage. Approximately, 99% membrane damage and/or 90% DNA damage are conservatively supposed as an indicator for sufficient bacterial inactivation as well as degradation of antibiotic resistance genes. The related required O dosing thresholds for sufficient inactivation of E. coli and autochthonous bacteria refer to ∼0.6 O/DOC (g/g), ∼50% decrease of UVA254, ∼60% decrease of UVA280, or ∼80% decrease of humic-like fluorescence. Within the range of 10-10 cell/mL, the bacterial concentration did not have significant effects on the required thresholds of the specific O doses or spectroscopic indicators required for bacterial inactivation. The addition of 50 mM tert-BuOH as ·OH scavenger increased the required specific ozone doses but decreased the losses of spectroscopic indicators necessary for sufficient bacterial inactivation, and also suggested that the membrane/DNA damages for bacterial inactivation were mainly attributed to the direct O attacks. The bromate concentration was determined using ion chromatography with MS/MS detection. The results showed that when O was dosed at the required thresholds for sufficient bacterial inactivation, bromate formation could usually be suppressed below 10 μg/L. The present work supports that it is possible to reach a balance between bacterial inactivation and bromate formation.

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Sustainable Desalination and Water Reuse

Hoek

Jassby

Kaner

et al. 2021

Synthesis Lectures on Sustainable Development

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Robust evaluation of performance monitoring options for ozone disinfection in water recycling using Bayesian analysis

Cited by 14 publications

References 24 publications

Proxies to monitor the inactivation of viruses by ozone in surface water and wastewater effluent

Proxies to monitor the inactivation of viruses by ozone in surface water and wastewater effluent

Applying UV absorbance and fluorescence indices to estimate inactivation of bacteria and formation of bromate during ozonation of water and wastewater effluent

Sustainable Desalination and Water Reuse

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