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Determination of Kinetic Parameters of Ozone During Oxidations of Alachlor in Water

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Abstract:

A study of the ozonation of the herbicide alachlor in distilled and surface water was performed. The influence of variables, including pH, water type, and free-radical-inhibiting substances, on the removal rate of alachlor was investigated. Alachlor was primarily removed from water through hydroxyl radical oxidation because low pH and the presence of natural substances such as carbonates significantly reduced the alachlor removal rate. Hydrogen peroxide was formed in low concentration during ozonation. Rate constants of the reactions between alachlor and ozone and between alachlor and the hydroxyl radicals were found to be 2.8 and 3.2 × 1010 L/mol·s, respectively. Because combined UV radiation and ozonation constitute one of the possible ozonation processes to treat alachlor, the quantum yield of this herbicide was determined and found to be 0.177 mol/einstein, which is a significant value compared to others found for different herbicides.

Keywords: ALACHLOR; OZONATION KINETICS; UV-HYDROGEN PEROXIDE OXIDATION; UV-OZONE OXIDATION; WATER OZONATION

Document Type: Research Article

DOI: https://doi.org/10.2175/106143000X138300

Publication date: 2000-11-01

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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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