Effects and mechanism of ozonation for degradation of sodium acetate in aqueous solution

De-min YANG; Bing WANG; Hong-yang REN; Jian-mei YUAN

doi:10.3882/j.issn.1674-2370.2012.02.004

Volume 5 Issue 2

Jun. 2012

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Article Navigation > Water Science and Engineering > 2012 > 5(2): 155-163

De-min YANG, Bing WANG, Hong-yang REN, Jian-mei YUAN. 2012: Effects and mechanism of ozonation for degradation of sodium acetate in aqueous solution. Water Science and Engineering, 5(2): 155-163. doi: 10.3882/j.issn.1674-2370.2012.02.004

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De-min YANG, Bing WANG, Hong-yang REN, Jian-mei YUAN. 2012: Effects and mechanism of ozonation for degradation of sodium acetate in aqueous solution. Water Science and Engineering, 5(2): 155-163. doi: 10.3882/j.issn.1674-2370.2012.02.004

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Effects and mechanism of ozonation for degradation of sodium acetate in aqueous solution

doi: 10.3882/j.issn.1674-2370.2012.02.004

1.
School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
2.
Chongqing Key Laboratory of Exogenic Minerallization and Mine Environment, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, P. R. China
3.
Chongqing Research Center of State Key Laboratory of Coal Resources and Safe Mining, Chongqing 400042, P. R. China

Funds: the Key Projects in the National Science and Technology Pillar Program during the Twelfth Five-Year Plan Period (Grant No. 2011BAC06B05) and the Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Grants No. PLN1126 and PLN1127).

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Corresponding author: De-min YANG
Received Date: 2011-05-06
Rev Recd Date: 2012-02-22

Abstract

Abstract

The degradation efficiencies and mechanism of ozonation for the degradation of sodium acetate in aqueous solution were investigated under atmospheric pressure at room temperature (293 K). The effects of the initial pH value, reaction time, and concentrations of, , CaCl₂, and Ca(OH)₂ on the removal rate of chemical oxygen demand (COD) were studied. The results indicated that ozonation obviously improved the degradation rate of sodium acetate when the pH value of the solution was not less than 8.5. A suitable long reaction time may be helpful in increasing the COD removal rate, and a removal rate of 36.36% can be obtained after a 30-minute treatment. The COD removal rate increased firstly and decreased subsequently with the increase of the concentration (from 0 to 200 mg/L), and under the same experimental condition it reached the optimum 34.66% at the concentration of 100 mg/L. The COD removal rate was 5.26% lower when the concentration of was 200 mg/L than when there was no . The COD removal rate decreased by 15.68% when the concentration increased from 0 to 200 mg/L. has a more obvious scavenging effect in inhibiting the formation of hydroxyl radicals than . CaCl₂ and Ca(OH)₂ could increase the degradation efficiency of sodium acetate greatly, and the COD removal rates reached 65.73% and 83.46%, respectively, after a 30-minute treatment, 29.37% and 47.10% higher, respectively, than with single ozone oxidation. It was proved that the degradation of sodium acetate in the ozonation process followed the mechanism of oxidization with hydroxyl free radicals (·OH).
- ozonation,
- sodium acetate,
- hydroxyl free radical,
- chemical oxygen demand (COD)

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References

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沈阳化工大学材料科学与工程学院沈阳 110142

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Effects and mechanism of ozonation for degradation of sodium acetate in aqueous solution

doi: 10.3882/j.issn.1674-2370.2012.02.004

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Effects and mechanism of ozonation for degradation of sodium acetate in aqueous solution

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