Treatment of waste containing EDTA by chemical oxidation |
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| Authors: | M D Tucker L L Barton B M Thomson B M Wagener A Aragon |
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| Institution: | 1. Sandia National Laboratories, Albuquerque, NM 88185, USA;2. Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA;3. Department of Civil Engineering, University of New Mexico, Albuquerque, NM 87131, USA;1. Department of Environmental Science, School of Earth and Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, India;2. Plant Ecology and Environmental Science Division, National Botanical Research Institute (NBRI), Lucknow, India;1. Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131, Padova, Italy;2. Acque Del Chiampo S.p.a, Servizio Idrico Integrato, Via Ferraretta, 20, 36071, Arzignano (Vi), Italy;1. School of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan, 410083, China;2. Suzhou Dongfang Environmental Engineering Co., Ltd., Suzhou, Jiangsu, 215110, China;3. Key Laboratory of Hunan Province for Comprehensive Utilization of Complex Copper-Lead Zinc Associated Metal Resources, Hunan Research Institute for Nonferrous Metals, Changsha, 410100, China;4. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming, 650093, China;1. Department of Chemical Engineering, Khalifa University of Science and Technology – Masdar Institute, P.O. Box 54224, Abu Dhabi, United Arab Emirates;2. Center for Membrane and Advanced Water Technology, Khalifa University of Science and Technology – Masdar City, P.O. Box 54224, Abu Dhabi, United Arab Emirates;3. Department of Chemical and Environmental Technology, ESCET, Rey Juan Carlos University, C/ Tulipán s/n, 28933, Mostoles, Madrid, Spain |
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| Abstract: | Ethylenediaminetetraacetic acid (EDTA) is a chelating agent that has been extensively used to enhance the solubilization of heavy metal cations and release of EDTA contributes to environmental problems. EDTA is recalcitrant to microbial metabolism and chemical oxidation is considered a possible method of remedial treatment. The use of the commercially available process of MIOX Corporation generates mixed oxidants on site and this solution is markedly effective in the destruction of the chelating characteristic and the decarboxylation of EDTA. When measuring the release of C-14 from carboxyl labeled EDTA, the mixed oxidant solution was comparable to the Fenton's reaction over a broad pH range. The presence of Mn2+, Cr3+, or Fe3+ at levels equal to that of EDTA stimulated the rate of EDTA decomposition; however, the rate of EDTA breakdown was inhibited when the concentration of Cr3+ or Mn2+ exceeded the concentration of EDTA. The treatment of Co2+–EDTA or Cu2+–EDTA with mixed oxidants in the presence of ultra violet light resulted in the loss of chelation ability of EDTA. In the absence of chelated metals, over 75% of the chelation property of a 70 mM EDTA solution was destroyed in 45 min. The reaction products resulting from the use of mixed oxidants added to EDTA were non-toxic to bacteria and should not contribute to additional environmental problems. |
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| Keywords: | EDTA Fenton's reaction Mixed waste |
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