Formation of haloacetamides during chlorination of dissolved organic nitrogen aspartic acid |
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| Authors: | Wen-hai Chu Nai-yun Gao Yang Deng |
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| Affiliation: | 1. State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, PR China;2. Department of Civil Engineering and Surveying, University of Puerto Rico, P.O. Box 9041, Mayaguez, Puerto Rico, 00681-9041, USA;1. State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China;2. Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China;3. La Verne, CA, 91750, United States;4. Department of Civil, Environmental, and Architectural Engineering, University of Colorado, Boulder, Boulder, CO, 80303, United States;1. State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China;2. Department of Civil and Environmental Engineering, University of Surrey, Guildford, GU2 7XH, UK;3. School of Life and Environmental Science, Wenzhou University, Wenzhou, Zhejiang province, 325035, China;4. School of Environmental and Safety Engineering, Changzhou University, Changzhou, Jiangsu province, 213164, China |
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| Abstract: | The stability of haloacetamides (HAcAms) such as dichloroacetamide (DCAcAm) and trichloroacetamide (TCAcAm) was studied under different experimental conditions. The yield of HAcAms during aspartic acid (Asp) chlorination was measured at different molar ratio of chlorine atom to nitrogen atom (Cl/N), pH and dissolved organic carbon (DOC) mainly consisted of humic acid (HA) mixture. Ascorbic acid showed a better capacity to prevent the decay of DCAcAm and TCAcAm than the other two dechlorinating agents, thiosulfate and sodium sulfite. Lower Cl/N favored the DCAcAm formation, implying that breakpoint chlorination might minimize its generation. The pH decrease could lower the concentration of DCAcAm but favored dichloroacetonitrile (DCAN) formation. DCAcAm yield was sensitive to the DOC due to higher chlorine consumption caused by HA mixture. Two possible pathways of DCAcAm formation during Asp chlorination were proposed. Asp was an important precursor of DCAN, DCAcAm and dichloroacetic acid (DCAA), and thus removal of Asp before disinfection may be a method to prevent the formation of DCAcAm, DCAN and DCAA. |
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