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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2008, Vol. 9 Issue (7): 994-1003    DOI: 10.1631/jzus.A071508
Materials Science and Chemical Engineering     
Removal and transformation of dissolved organic matter in secondary effluent during granular activated carbon treatment
Liang-liang WEI, Qing-liang ZHAO, Shuang XUE, Ting JIA
State Key Laboratory of Urban Water Resources and Environments (SKLUWRE), School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China
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Abstract  This paper focused on the removal and transformation of the dissolved organic matter (DOM) in secondary effluent during the granular activated carbon (GAC) treatment. Using XAD-8/XAD-4 resins, DOM was fractionated into five classes: hydrophobic acid (HPO-A), hydrophobic neutral (HPO-N), transphilic acid (TPI-A), transphilic neutral (TPI-N) and hydrophilic fraction (HPI). Subsequently, the water quality parameters of dissolved organic carbon (DOC), absorbance of ultraviolet light at 254 nm (UV-254), specific ultraviolet light absorbance (SUVA) and trihalomethane formation potential (THMFP) were analyzed for the unfractionated and fractionated water samples. The results showed that the order of the DOC removal with respect to DOM fractions was observed to be HPI>HPO-A>HPO-N>TPI-A>TPI-N. During the GAC treatment, the THMFP of the unfractionated water samples decreased from 397.4 µg/L to 176.5 µg/L, resulting in a removal efficiency of 55.6%. The removal order of the trihalomethanes (THMs) precursor was as follows: HPO-A>TPI-A>TPI-N>HPO-N>HPI. By the GAC treatment, the specific THMFP of HPO-A, TPI-A, TPI-N and the original unfractionated water samples had a noticeable decrease, while that of HPO-N and HPI showed a converse trend. The Fourier transform infrared (FTIR) results showed that the hydroxide groups, carboxylic acids, aliphatic C–H were significantly reduced by GAC treatment.

Key words： Dissolved organic matter (DOM)      Fractionation      Trihalomethane formation potential (THMFP)      Specific THMFP      Fourier-transform infrared (FTIR)     
Received: 23 September 2007     
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Liang-liang WEI
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Shuang XUE
Ting JIA
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Liang-liang WEI, Qing-liang ZHAO, Shuang XUE, Ting JIA. Removal and transformation of dissolved organic matter in secondary effluent during granular activated carbon treatment. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2008, 9(7): 994-1003.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A071508     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2008/V9/I7/994

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