Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 605, Issue -, Pages 1-8Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2017.06.170
Keywords
Trihalomethanes; N-nitrosodimethylamine; Granular activated carbon; Molecular weight
Categories
Funding
- National Natural Science Foundation of China [NSFC 21577024, 50808049]
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Molecular weight (MW) distributions in source and treated water in Shanghai, China were investigated to understand the relationship between trihalomethanes formation potential/N-nitrosodimethylamine formation potential (THMFP/NDMAFP) and dissolved organic carbon (DOC) for different MW ranges (< 1 K, 1-10 K, 10-30 K, > 30 K Da). The result of MW distributions in source water indicated a relationship between THMFP/NDMAFP and DOC such that DOC for < 1 K and 1-30 K Da DOC were linearly related to THMFP and NDMAFP, respectively. In treated water, > 30 K Da THMFP was totally removed whereas < 1 K Da THMFP showed linear relationships with R-2 = 0.88 and 0.83 after sand and granular activated carbon (GAC) filtration, respectively. DOC content for 1-10 K Da tended to form NDMA according to the results for treated water between DOC and NDMAFP (R-2 = 0.94 and 0.93 for sand and GAC filtration, respectively). The results may provide researchers with targeted treatment strategies to destroy, remove, or reduce the occurrence of THMs and NDMA precursors. The findings presented in this study will be of great value in future work for selecting suitable drinking water treatment processes to minimize the formation of disinfection by-products using chlorine or chloramine disinfection. (C) 2017 Elsevier B.V. All rights reserved.
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