Journal of Water Supply: Research and Technology—AQUA Vol 57 No 4 pp 253–258 © IWA Publishing 2008 doi:10.2166/aqua.2008.041
Molecular weight distribution variation of assimilable organic carbon during ozonation/BAC process
Shu Shi-hu, He Wen-Jie, Yan Min and Gao Nai-yun
School of Municipal and Environmental Engineering, 209 Mail box, Second Campus of Harbin Institute of Technology, No. 202, Hai He Road, Harbin, Heilongjiang, 150090, China Tel.: +86-451-86284615 Fax: +86-451-86283086 E-mail: ssh314@126.com
College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, 310014, China
State Key Lab of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China
ABSTRACT
Assimilable organic carbon (AOC) was measured combined with molecular weight (MW) distribution during a long time operation of a pilot scale ozonation/BAC (biological activated carbon) process in a water treatment plant in China. The AOC measurement was done on different samples: raw water, water samples after sedimentation, sand filtration, ozonation and BAC filtration. MW distribution variation of AOC during ozonation/BAC process was evaluated. Results showed that AOC was mainly related to the NOM (natural organic matter) with MW < 1 kDa. The fraction of the NOM with MW < 1 kDa corresponds to 53–67% of the dissolved organic carbon (DOC) to all the samples while AOC corresponds to 2.7–5.9% of DOC. So just a small part of the fraction with MW < 1 kDa was AOC. This indicates that ozonation/BAC process removing a large part of DOC will not necessarily result in a great reduction in AOC.
Keywords: AOC; MW; NOM; ozonation/BAC process
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