The promotions on radical formation and micropollutant degradation by the synergies between ozone and chemical reagents (synergistic ozonation): A review

Wu, Qian-Yuan; Yang, Zheng-Wei; Du, Ye; Ouyang, Wan-Yue; Wang, Wenlong

doi:10.1016/j.jhazmat.2021.126327

Cited by 51 publications

(18 citation statements)

References 127 publications

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“…Carboxylic acid, hydroxyl, and aryl groups in DOM react with • OH and can act as radical promotors, through which organic radicals can form and then propagate the radical chain reactions to eventually produce another • OH. ,,, Alkyl groups in DOM act as inhibitors to interrupt radial chain reactions by rapidly scavenging • OH. Depending on DOM properties, both inhibitory and promoting effects on pollutants removal have been observed in ozonation and ozone-based AOPs. , …”

Section: Synergistic Contribution Of Dom Toward Troc Transformationmentioning

confidence: 99%

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Multiple Roles of Dissolved Organic Matter in Advanced Oxidation Processes

Yang

Rosario‐Ortiz

Lei

et al. 2022

Environ. Sci. Technol.

198

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Advanced oxidation processes (AOPs) can degrade a wide range of trace organic contaminants (TrOCs) to improve the quality of potable water or discharged wastewater effluents. Their effectiveness is impacted, however, by the dissolved organic matter (DOM) that is ubiquitous in all water sources. During the application of an AOP, DOM can scavenge radicals and/or block light penetration, therefore impacting their effectiveness toward contaminant transformation. The multiple ways in which different types or sources of DOM can impact oxidative water purification processes are critically reviewed. DOM can inhibit the degradation of TrOCs, but it can also enhance the formation and reactivity of useful radicals for contaminants elimination and alter the transformation pathways of contaminants. An indepth analysis highlights the inhibitory effect of DOM on the degradation efficiency of TrOCs based on DOM's structure and optical properties and its reactivity toward oxidants as well as the synergistic contribution of DOM to the transformation of TrOCs from the analysis of DOM's redox properties and DOM's transient intermediates. AOPs can alter DOM structure properties as well as and influence types, mechanisms, and extent of oxidation byproducts formation. Research needs are proposed to advance practical understanding of how DOM can be exploited to improve oxidative water purification.

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Section: Synergistic Contribution Of Dom Toward Troc Transformationmentioning

confidence: 99%

“…Depending on DOM properties, both inhibitory and promoting effects on pollutants removal have been observed in ozonation and ozone-based AOPs. 196,197…”

Section: Formation and Reactivity Of Transient Species Within Dommentioning

confidence: 99%

Multiple Roles of Dissolved Organic Matter in Advanced Oxidation Processes

Yang

Rosario‐Ortiz

Lei

et al. 2022

Environ. Sci. Technol.

198

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“…The degradation of compounds in wastewater treatment by advanced oxidation relies on the principle of oxidation by highly reactive hydroxyl ions. 19,20 Removal efficiencies, however, vary greatly depending on the AOP's used, or combinations thereof, and the chemical properties of the contaminants in question. 18 Biological degradation of micropollutants has also been widely investigated as a cost-effective and environmentally friendly alternative for micropollutant removal.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micropollutant transformation and toxicity: Electrochemical ozonation versus biological metabolism

Bröcker

Stone

Carstens

et al. 2022

Toxicology Research and Application

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Environmental water sources are constantly polluted by anthropogenic compounds, not always minimized by conventional water treatment methods to remove these compounds at the micro- and nano-range. The absolute concentrations of a suite of seven representative environmental micropollutants were compared pre- and post-treatment with both ozone and microbial biofilms, in terms of removal efficiencies and toxicity assays. Both synthetic micropollutant mixes and environmental water samples were evaluated. The study started with two representative micropollutants (carbamazepine, CBZ, and sulfamethoxazole, SMX), and broadened into a suite of pollutants, evaluating whole-sample eco-toxicological footprints. An ozone concentration of 4.24 ± 0.27 mg/L in tap water, resulted in an 87.9% and 96.5% removal of CBZ and SMX, respectively, within 1 min. Despite almost immediate removal of parent micropollutants by oxidation, endocrine disruption potential (anti-estrogenicity) of CBZ and SMX required up to 240 min of ozone treatment to show no assay effect. A broader suite of micropollutants in more complex environmental matrices showed scavenging of ozone (2.95 ± 0.17–0.25 ± 0.03 mg/L) and varying micropollutant recalcitrance to oxidation. Lower matrix pollution led to lower reduction in eco-toxicity. Microbial degradation of CBZ and SMX (56% and 70% versus 19% and 79%, respectively, in duplicate biofilms) by nutrient-limited biofilms showed less removal than ozonation, with marked variation due to the stochastic nature of biofilm sloughing. Microbial degradation of CBZ and SMX resulted in an increase of >90% in both estrogenicity and Aliivibrio inhibition. The results obtained from this study address a gap in understanding the removal efficiency of micropollutants, where the removal process often receives more attention than the comparative reduction of toxicological effects. This shift from a controlled laboratory environment to real-world scenarios also provided comparative insights into the removal of micropollutants and the eco-toxicity of the transformation by-products of each process.

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“…phenols, anilines, olefins, reduced sulphur, and deprotonated amine groups) (Figure 1.2) [60]. Radicals react fast with almost all compounds, but are normally formed to a low extent (10 8 times lower than free ozone hydrogen peroxide, peroxymonosulfate, sodium thiosulfate, or hydroxylamine) or UV light, but this directly increases the operational costs of the treatment, which makes it less attractive [63]. Ozonation has shown its potential to remove a broad range of MPs from WWTP effluents at full-scale, but in many countries further implementation is limited by the high required energy and cost inputs and the formation of potentially toxic OTPs [45,64].…”

Section: Ozonationmentioning

confidence: 99%

The BO3 process for removal of micropollutants from wastewater treatment plant effluent : exploring the synergies between biological treatment and ozonation

Gijn¹

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Wastewater treatment plant effluent is an i mportant point source for micropollutants emissions into the environment. These micropollutants can pose risks for ecosystems and humans; therefore, wastewater treatment plants should be upgraded to improve their micropollutant removal. Micropollutant removal can be improved by implementing tertiary treatment such as ozonation or activated carbon filtration. However, organic matter in the wastewater treatment plant effluent interferes with the micropollutant removal in these tertiary treatments, resulting in high energy demand and costs. To decrease the energy demand of tertiary treatment, biological pre-treatment can be introduced to remove effluent organic matter in an energy efficient manner. This biological pre-treatment was optimized by comparing three types of bioreactors; biological activated carbon, sand filter, and moving bed bioreactor. The reactors were operated at five flow rates (0.25, 0.5, 1, 2 and 4 L/h) in a continuous setup. The biological activated carbon filter achieved higher effluent organic matter removal than the sand filter and moving bed bioreactor (up to 72, 41, and 21% respectively). Additionally, effluent organic matter removal was negatively correlated to the flow rate in the biological activated carbon filter and the sand filter. The biological activated carbon filter also achieved average removal of 85% for the 18 analyzed micropollutants, although how long this high micropollutant removal can be sustained is unclear. To conclude, the biological activated carbon filter as pre-treatment can achieve high effluent organic matter removal, which would decreases the energy demand and cost of subsequent treatment for micropollutant removal.

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The promotions on radical formation and micropollutant degradation by the synergies between ozone and chemical reagents (synergistic ozonation): A review

Cited by 51 publications

References 127 publications

Multiple Roles of Dissolved Organic Matter in Advanced Oxidation Processes

Multiple Roles of Dissolved Organic Matter in Advanced Oxidation Processes

Micropollutant transformation and toxicity: Electrochemical ozonation versus biological metabolism

The BO3 process for removal of micropollutants from wastewater treatment plant effluent : exploring the synergies between biological treatment and ozonation

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