期刊
WATER RESEARCH
卷 145, 期 -, 页码 453-463出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2018.08.055
关键词
Chloride; Advanced oxidation processes; Chlorinated by-products; Kinetic modeling; Sulfate radical
资金
- National Natural Science Foundation of China [21677031]
- National Key Research Development Program of China [2016YFC0400501/2016YFC0400509]
- Fundamental Research Funds for the Central Universities [CUSF-DH-D-2017095, 2232018G-11]
- Natural Science Foundation of Heilongjiang Province [B2016002]
In recent years, a significant effort has been devoted into investigating the effects of chloride on the degradation kinetics of aromatic pollutants. The impact of chloride on the decomposition of short-chain carboxylic acid intermediates from aromatics degradation has often been overlooked. In this study the roles of chloride in the oxidation of maleic acid (MA) in the Fe(II)/peroxymonosulfate (PMS) process was investigated. Degradation efficiency, reaction intermediates, adsorbable organic halogen (AOX) accumulation and mineralization were examined. The chloride ion (Cl-) was found to have an overall negative impact on MA degradation and mineralization in the Fe(II)/PMS system. The presence of Cl- led to the formation of chlorinated by-products and a high production of AOX. The mineralization of MA was decreased with increasing Cl- concentrations. Kinetic modeling demonstrated the impact of various radicals largely depended on the concentration of Cl-. The significance of Cl-2(center dot-) or Cl-2 for MA destruction was enhanced with increasing Cl- content, and overwhelmed that of SO4 center dot- when the Cl- concentration was over 5 mM. In the absence of Cl-, SO4 center dot- was the primary radical responsible for MA oxidation. A possible degradation pathway is proposed (cis-trans isomerization, decarboxylation and halogenations processes). These results may help to understand the full oxidation pathways of refractory aromatic compounds and the mechanism of chlorinated by-products formation in industrial saline wastewater treatment. (C) 2018 Elsevier Ltd. All rights reserved.
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