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Degradation of triethanolamine and chemical oxygen demand reduction in wastewater by photoactivated periodate

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The rapid reduction of chemical oxygen demand (COD) of industrial wastewater is achieved using a novel oxidant, periodate (IO4 ), coupled with ultraviolet (UV) irradiation. The wastewater is characterized by a high COD, low total suspended solids, variable triethanolamine (TEA) concentrations, and low concentrations of iron and zinc. The use of periodate and UV irradiation with either aqueous TEA solutions or real wastewater is shown to be effective in reducing the COD to acceptable levels. The optimal pH for COD degradation is determined to be 7.6 because of the combined effects of pH on the speciation of TEA and IO4 Increasing the ratio of the initial concentrations of period ate to TEA, [IO4 ]0/[TEA]0, increased the degradation rate up to an apparent saturation value. Irradiation with a 1 000-W mercury-xenon lamp increased the COD pseudo-first-order degradation rate constant by a factor of 5.5 for synthetic TEA solutions and 2.3 for industrial wastewater, compared to irradiation with a 1 000-W xenon lamp.
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Keywords: CHEMICAL OXYGEN DEMAND; OXIDATION; PERIODATE; PHOTOLYSIS; TRIETHANOLAMINE; ULTRAVIOLET IRRADIATION

Document Type: Research Article

Publication date: 1997-09-01

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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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