Reduction of dissolved organic matter and trihalomethane formation potential during laboratory-scale soil-aquifer treatment

Authors: Xue, S.; Zhao, Q. L.; Wei, L. L.; Wang, L. N.

Source: Water and Environment Journal, Volume 22, Number 2, June 2008 , pp. 148-154(7)

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Abstract:

Dissolved organic matter (DOM) in recovered groundwater from soil-aquifer treatment (SAT) has the potential to generate harmful disinfection by-products. This study investigated the reduction of mass and trihalomethane formation potential (THMFP) of DOM fractions from secondary effluent during laboratory-scale SAT. Using XAD-8 and XAD-4 resins, DOM was fractionated into three fractions: hydrophobic acid (HPO-A), transphilic acid (TPI-A) and hydrophilic fraction (HPI). HPO-A was removed by 61.1%, TPI-A by 54.9% and HPI by 75.0% as dissolved organic carbon (DOC) during the laboratory-scale SAT, respectively. The reduction of THMFP from HPO-A, TPI-A and HPI was 27.24, 26.24 and 36.08%, respectively. Specific THMFP for each DOM fraction increased across the soil columns. HPO-A was found to be the major precursor of THMs. THMFP was strongly correlated to ultraviolet light at 254 nm (UV-254) for HPO-A and HPI, while the relationship between THMFP and UV-254 for TPI-A was significantly poor.

Keywords: biodegradability; dissolved organic matter; fraction; soil-aquifer treatment; trihalomethane formation potential

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1747-6593.2007.00093.x

Affiliations: 1: School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin, China

Publication date: 2008-06-01