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Advanced Treatment of Sodium Acetate in Water by Ozone Oxidation

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Abstract:

ABSTRACT: 

Ozone oxidation is an advanced oxidation process for treatment of organic and inorganic wastewater. In this paper, sodium acetate (according to chemical oxygen demand [COD]) was selected as the model pollutant in water, and the degradation efficiencies and mechanism of sodium acetate in water by ozone oxidation were investigated. The results showed that the ozone oxidation was an effective treatment technology for advanced treatment of sodium acetate in water; the COD removal rate obtained the maximum value of 45.89% from sodium acetate solution when the pH value was 10.82, ozone concentration was 100 mg/L, reaction time was 30 minutes, and reaction temperature was 25 °C. The COD removal rate increased first and decreased subsequently with the bicarbonate (HCO3 -) concentration from 0 to 200 mg/L, the largest decline being 20.35%. The COD removal rate declined by 25.38% with the carbonate (CO3 2−) concentration from 0 to 200 mg/L; CO3 2− has a more obvious scavenging effect to inhibit the formation of hydroxyl free radicals than HCO3 -. Calcium chloride (CaCl2) and calcium hydroxide (Ca(OH)2) could enhance the COD removal rate greatly; they could reach 77.35 and 96.53%, respectively, after a reaction time of 30 minutes, which was increased by 31.46 and 50.64%, respectively, compared with only ozone oxidation. It was proved that the main ozone oxidation product of sodium acetate was carbon dioxide (CO2), and the degradation of sodium acetate in the ozone oxidation process followed the mechanism of hydroxyl free radicals.

Keywords: advanced oxidation process; hydroxyl free radical; mechanism; ozone oxidation; removal rate; sodium acetate

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143013X13807328849134

Affiliations: No. 177-9, No. 2 Changjiang Road, Yuzhong District, Chongqing Key Laboratory of Exogenic Mineralization and Mine Environment, Chongqing, Chongqing Institute of Geology and Mineral Resources, Chongqing Cit y, 400042, People’s Republic of China

Publication date: February 1, 2014

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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