Henry And Mass Transfer Coefficients In The Ozonation Of Wastewaters

Beltrán, Fernando J.; García‐Araya, Juan F.; Encinar, J.M.

doi:10.1080/01919519708547307

Cited by 29 publications

(14 citation statements)

References 20 publications

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“…The influence of pH in radical reactions is a well‐known phenomenon, but, in most cases, the effect of the initial pH on the degradation rate has not been clearly determined. In this regard, the analysis of the degradation of azo‐dye Red X‐GRL conducted by Zhao et al finds no significant influence of pH, which is explained by the occurrence of a double‐opposing effect.…”

Section: Resultsmentioning

confidence: 99%

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Oxidizing efficiency analysis of an ozonation process to degrade the dye rhodamine 6G

Rodríguez

Lombraña

Luis

et al. 2016

J. Chem. Technol. Biotechnol

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BACKGROUND Advanced oxidation includes a number of technologies, all of them appropriate to achieve environmental remediation. One of them is the organic compounds degradation by ozonation. The ozonation of rhodamine 6G (R6G) was investigated to study the effect of pH and subsequent predominance of the control stage, whether mass transfer from gas to liquid phase or chemical reaction, during oxidation. Several pH conditions are studied to achieve greater efficiency of the process. RESULTS A mathematical model enables analysis of the controlling stage. It was satisfactorily verified, showing that, initially, the process is controlled by the G‐L mass transfer stage but, as the R6G ozonation progresses the process becomes controlled by the kinetic reaction. While 99% of the rhodamine dye is removed during the mass transfer control stage regardless of the pH value, the percentage of TOC removal is increased only during the kinetic reaction control stage. CONCLUSION The most favourable pH, given the mass transfer characteristics of this case, was found to be an intermediate value around 6.0 where a minimum value for coefficient for R6G mineralization zav of about 23 mol O3 mol−1 R6G mineralized, and near its theoretical value, was obtained. © 2016 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

“…In summary, many papers cited above and similar, analyze transfer efficiency of ozone in the absence of chemical reaction . Many articles focus study on dye ozonation regardless of mass transfer .…”

Section: Introductionmentioning

confidence: 99%

Oxidizing efficiency analysis of an ozonation process to degrade the dye rhodamine 6G

Rodríguez

Lombraña

Luis

et al. 2016

J. Chem. Technol. Biotechnol

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“…Equation. [6] is slightly better in terms of statistics when analysis of the residues is performed. With a few exceptions the experimental data of different authors deviate from the IOA standard line max.…”

Section: Ozone Solubility In Watermentioning

confidence: 97%

“…Determination of ozone solubility in wastewaters is of great practical importance. A procedure that enables determining the apparent Henry's law constant together with the mass transfer coefficients for such systems was presented by Beltra´n et al (1997). From their data one can conclude that the values of H app for the tomato wastewater are higher by 20% than those for ultrapure water (I = 0.01 M, pH = 7, buffering agent sodium phosphate).…”

Section: Ozone Solubility In Aqueous Systemsmentioning

confidence: 98%

Ozone Solubility in Liquids

Biń

2006

Ozone: Science & Engineering

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“…Removal of Lipopliilic Wood Extractives from Paper RIill Water by Ozone 591 A convenient method for estimation of volumetric mass transfer and Henry's coefficient has been presented by Beltran et al (1997). In this method both parameters can be estimated simultaneously from semi-batch ozonation experiments.…”

Section: Parameter Estimationmentioning

confidence: 99%

Selective Removal of Lipophilic Wood Extractives from Paper Mill Water Circulations by Ozonation

Лаари¹,

Korhonen²,

Kallas³

et al. 2000

Ozone: Science & Engineering

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Printed in the U.S.A. 0191-951m63.00+ .a) lntcrnntiond Ozone Assmintion AbstractCirculation waters from paper mills and TMP production were treated by selective ozonation to remove lipophilic wood extractives (LWE's). In the reaction model, ozone was assumed to react with overall organic matter measured as COD with one global reaction rate coefficient. The target compounds, LIVE'S, are a part of the overall organic matter and they react with ozone with a specific reaction rate coefficient. Reaction selectivity, defined as the ratio of reaction rate coefficients of the reactions of ozone with the LWE's and COD, describes how efficiently ozone is used to remove the LIVE'S compared to removal of COD. The reaction selectivity was determined from experimental results and it was found to vary from 3 to 20 for different sets of water and for different fractions of LWE's. However, the ozone dose needed for removal of extractives was found to be rather high, about 100 -300 ms/dm3 for 50 % removal. The reason is the high concentration of organic matter in the waters leading to excessive usage of ozone despite the high selectivity of the reaction. A reactor model was developed to predict the behavior of industrial ozonation reactors. The reactor model takes into account the variation in the rate coefficient with respect to the reaction extent.

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Henry And Mass Transfer Coefficients In The Ozonation Of Wastewaters

Cited by 29 publications

References 20 publications

Oxidizing efficiency analysis of an ozonation process to degrade the dye rhodamine 6G

Oxidizing efficiency analysis of an ozonation process to degrade the dye rhodamine 6G

Ozone Solubility in Liquids

Selective Removal of Lipophilic Wood Extractives from Paper Mill Water Circulations by Ozonation

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