Removal of disinfection by-product precursors with ozone-UV advanced oxidation process

Chin, Adeline; Bérubé, Pierre R.

doi:10.1016/j.watres.2005.03.021

Cited by 167 publications

(44 citation statements)

References 18 publications

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“…Such result suggests the complete mineralization of the organic contaminants referred as TOC, when adding UV light to ozone-based processes, since the TOC reduction indicates that the organic carbon was converted to CO 2 (Medley and Stover 1983). This positive effect on the TOC reduction by ozone associated to UV has also been previously reported (Chin and Bérubé 2005). When comparing the efficiency of Fenton and photoFenton to treat similar cleaning wastewaters, we also found the UV was a relevant factor in promoting TOC reduction (Hansson et al 2012).…”

Section: Treatment Efficiency-cod and Toc Reductionssupporting

confidence: 85%

Advanced Oxidation Treatment of Recalcitrant Wastewater from a Wood-Based Industry: a Comparative Study of O3 and O3/UV

Hansson

Kaczala

Amaro

et al. 2015

Water Air Soil Pollut

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Ozone and ozone-based advanced oxidation processes were applied for the treatment of a recalcitrant wastewater generated by wood-based industries that contains different inorganic and organic constituents and high chemical oxygen demand (COD) varying between 3,400 and 4,000 mg/L. The investigation used a tubular ozone reactor combined with an UV reactor designed for different hydraulic retention times. The dependent variables addressed to evaluate the treatment efficiency were the reduction of COD and total organic carbon (TOC) and the biodegradability of the treated effluent based on respirometric studies using activated sludge from a wastewater treatment. The results showed that even though ozonation alone at acid pH promoted COD and TOC reductions of 65 and 31 % respectively, a decrease in the biodegradability was observed. The most effective treatment (COD and TOC reductions of 93 and 43 %, respectively) was obtained when applying ozone combined with UV light at basic pH. The ozone-UV combination was capable of increasing the amount of readily available COD by 75 % with an additional reduction of TOC by 60 %. In conclusion, ozonation at low pH effectively reduces the COD content in wastewater generated by the wood-based industry; however, in order to combine advanced oxidation with biological process, ozone combined with UV is recommended.

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Section: Treatment Efficiency-cod and Toc Reductionssupporting

confidence: 85%

Advanced Oxidation Treatment of Recalcitrant Wastewater from a Wood-Based Industry: a Comparative Study of O3 and O3/UV

Hansson

Kaczala

Amaro

et al. 2015

Water Air Soil Pollut

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“…In this process, the reactant molecules (or sensitizers) absorb the light energy and are transformed into other chemical forms through activation. This process thus involves the homolytic cleavage of activated molecules to form the degradation products [17]. In fact, the prolific dividends of photo-based methods in the treatment of pesticides are diverse enough to include low cost operations, easy handling, high efficiency, etc.…”

Section: Photobased Methodsmentioning

confidence: 99%

A review of photochemical approaches for the treatment of a wide range of pesticides

Reddy

Kim

2015

Journal of Hazardous Materials

167

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“…[1][2][3][4][5] O 3 is a strong oxidant, the second strongest after chlorine, with an oxidation potential of 2.07 V. For this reason, it is a viable option as a replacement for chlorine as a water disinfectant. When using O 3 as a disinfectant, the main advantage over chlorine is that few harmful by-products are produced whereas chlorine produces halogenated complexes on reaction.…”

Section: Introductionmentioning

confidence: 99%

Insights into the mechanism of electrochemical ozone production via water splitting on the Ni and Sb doped SnO₂ catalyst

Gibson

Wang

Hardacre

et al. 2017

Phys. Chem. Chem. Phys.

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This is an Accepted Manuscript, which has been through the Royal Society of Chemistry peer review process and has been accepted for publication.Accepted Manuscripts are published online shortly after acceptance, before technical editing, formatting and proof reading. Using this free service, authors can make their results available to the community, in citable form, before we publish the edited article. We will replace this Accepted Manuscript with the edited and formatted Advance Article as soon as it is available.You can find more information about Accepted Manuscripts in the author guidelines. The H2O splitting mechanism is a very attractive alternative used in electrochemistry for the formation of O3. The most efficient catalysts employed for this reaction at room temperature are SnO2-based, in particular the Ni/Sb-SnO2 catalyst. In order to investigate the H2O splitting mechanism Density Functional Theory (DFT) was performed on a Ni/Sb-SnO2 surface with oxygen vacancies. By calculating different SnO2 facets, the (110) facet was deemed most stable, and further doped with Sb and Ni. On this surface, the H2O splitting mechanism was modelled paying particular attention to the final two steps, the formation of O2 and O3. Previous studies on β-PbO2 have shown that the final step in the reaction (the formation of O3) occurs via an Eley-Rideal style interaction where surface O2 desorbs before attacking surface O to form O3. It is revealed that for Ni/Sb-SnO2, although the overall reaction is the same the surface mechanism is different. The formation of O3 is found to occur through a Langmuir-Hinshelwood mechanism as opposed to Eley-Rideal. In addition to this the relevant adsorption energies (Eads), Gibb's free energy (ΔGrxn) and activation barriers (Eact) for the final two steps modelled in the gas phase have been shown; providing the basis for a tool to develop new materials with higher current efficiencies.

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Removal of disinfection by-product precursors with ozone-UV advanced oxidation process

Cited by 167 publications

References 18 publications

Advanced Oxidation Treatment of Recalcitrant Wastewater from a Wood-Based Industry: a Comparative Study of O3 and O3/UV

Advanced Oxidation Treatment of Recalcitrant Wastewater from a Wood-Based Industry: a Comparative Study of O3 and O3/UV

A review of photochemical approaches for the treatment of a wide range of pesticides

Insights into the mechanism of electrochemical ozone production via water splitting on the Ni and Sb doped SnO₂ catalyst

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Removal of disinfection by-product precursors with ozone-UV advanced oxidation process

Cited by 167 publications

References 18 publications

Advanced Oxidation Treatment of Recalcitrant Wastewater from a Wood-Based Industry: a Comparative Study of O3 and O3/UV

Advanced Oxidation Treatment of Recalcitrant Wastewater from a Wood-Based Industry: a Comparative Study of O3 and O3/UV

A review of photochemical approaches for the treatment of a wide range of pesticides

Insights into the mechanism of electrochemical ozone production via water splitting on the Ni and Sb doped SnO2 catalyst

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Product

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Insights into the mechanism of electrochemical ozone production via water splitting on the Ni and Sb doped SnO₂ catalyst