期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 327, 期 -, 页码 153-160出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.12.058
关键词
Microcystin-LR; Disinfection by-products; Haloacetaldehydes; Permanganate; Hydrogen peroxide; Chlorine dioxide
资金
- National Natural Science Foundation of China [51578389, 51378366, 51278351]
- National Major Science and Technology Project of China [2014ZX07405-003, 2015ZX07406-004]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRE16009]
- Research and Development Project of Ministry of Housing and Urban-Rural Development [2015-K7-028]
- Fundamental Research Funds for the Central Universities
Microcystins (MCs) in drinking water have gained much attention due to their adverse health effects. However, little is known about the impact of pre-oxidation in the formation of disinfection by-products (DBPs) during the downstream chlorination of MCs. The present study examined the formation of both carbonaceous and nitrogenous DBPs from chlorination of MC-LR (the most abundant MC species) and evaluated the impact of permanganate (PM), hydrdgen peroxide (H2O2) and chlorine dioxide (ClO2) pre-oxidation on the DBP formation in chlorination. Higher yields of chloroform (CF) (maximum 43.0%) were observed from chlorination of MC-LR than free amino acids which are included in MC-LR structure. Chloral hydrate (CH) and dichloroacetonitrile (DCAN) were also produced from the chlorination of MC-LR, and the latter one was formed probably due to the chlorination of peptide bonds. A high pH favored the production of CF and CH, but inhibited the formation of DCAN. In the presence of bromide, bromo-DBPs could be produced to pose a threat. For example, 0.58 a of tribromoacetald ehyde was produced from the chlorination of MC-LR at Br- =200 g/L. PM and ClO2 pre-oxidation could both reduce the DBP formation from MC-LR. In contrast, H2O2 appeared not to significantly control the DBP formation. (C) 2016 Elsevier B.V. All rights reserved.
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