Decomposition of aqueous ozone in the presence of aromatic organic solutes

Pi, Yunzheng; Schumacher, Jochen; Jekel, Martin

doi:10.1016/j.watres.2004.09.004

Cited by 75 publications

(39 citation statements)

References 16 publications

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“…At pH = 12 this ratio was 2.31 and 3.35 for CEH and CEHDED stage bleaching effluents, respectively. Actually, these results are in accordance with the results of a recent study in which acceleration of ozone decomposition by the presence of aromatic compounds was reported (Pi et al, 2005).…”

Section: Ozonation Of Bleaching Effluentssupporting

confidence: 93%

Application of Ozonation and Biotreatment for Forest Industry Wastewater

Balcıoğlu

Saraç

Kıvılcımdan

et al. 2006

Ozone: Science & Engineering

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This research is focused on the integrated process for the treatment of bleached Kraft pulp mill effluents. Preozonation of softwood and hardwood combined bleaching effluents at alkaline pH resulted in 50 and 44% COD abatement, respectively. Segregation of highly polluted streams of bleaching process can be recommended to reduce the cost of treatment since the COD removal yield of CEH effluents was higher than combined bleaching effluents. Moreover, biodegradability of CEH effluents in terms of BOD 5 /COD ratio was increased from 0.16 to 0.32. Noticeable color removal was achieved by pre-ozonation of the CEH stage and combined bleaching effluents. Preozonation enhanced the performance of subsequent algal treatment in the sequential batch reactor (SBR) and activated sludge treatment. Algae have a higher ability to degrade AOX producing compounds together with a high COD removal rate. Although pre-ozonation increased the abatement rate of COD of SBR, the AOX removal rate remained constant as 87%.

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Section: Ozonation Of Bleaching Effluentssupporting

confidence: 93%

Application of Ozonation and Biotreatment for Forest Industry Wastewater

Balcıoğlu

Saraç

Kıvılcımdan

et al. 2006

Ozone: Science & Engineering

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“…Ozone CT is used to assess disinfection during drinking water applications and can also be used to evaluate contaminant oxidation (7 (12,13). Decreases in UV 254 during the initial O 3 demand phase (t < 30 s) or after first-order O 3 decay make it a promising surrogate to evaluate oxidation after both phases of O 3 oxidation.…”

Section: Introductionmentioning

confidence: 99%

Using Ultraviolet Absorbance and Color To Assess Pharmaceutical Oxidation during Ozonation of Wastewater

Wert

Rosario‐Ortiz

Snyder

2009

Environ. Sci. Technol.

116

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The reduction of ultraviolet (UV) absorbance at 254 nm (UV 254 ) and true color were identified as appropriate surrogates to assess the oxidation of six pharmaceuticals (i.e., carbamazepine, meprobamate, dilantin, primidone, atenolol, and iopromide) during ozonation of wastewater. Three tertiary-treated wastewaters were evaluated during oxidation with ozone (O 3 ) and O 3 coupled with hydrogen peroxide (O 3 /H 2 O 2 ). The correlation between pharmaceutical oxidation and removal of UV 254 was dependent upon the reactivity of each specific compound toward ozone, as measured by the second-order rate constant (k′′ O 3 ). Oxidation of compounds with k′′ O 3 > 10 3 M -1 s -1 correlated well (R 2 > 0.73) with UV 254 reduction between 0-50%. Oxidation of compounds with apparent k′′ O 3 < 10 M -1 s -1 resulted primarily from hydroxyl radicals and correlated well (R 2 > 0.80) with the UV 254 reduction of 15-65%. The removal of true color also correlated well (R 2 > 0.85) with the oxidation of pharmaceuticals during the ozonation of two wastewaters. These correlations demonstrate that UV 254 reduction and true color removal may be used as surrogates to evaluate pharmaceutical oxidation in the presence or absence of dissolved ozone residual during advanced wastewater treatment with O 3 or O 3 /H 2 O 2 . The use of online UV 254 measurements would allow wastewater utilities to optimize the ozone dose required to meet their specific treatment objectives.

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“…Some aromatic compaunds do not react with ozone but they do react with OH-radical. This second pathway is faster than the mechanism explained above (Pi, 2005).…”

Section: Reaction Terminationmentioning

confidence: 65%