| Removal and transformation of organic matter during soil-aquifer treatment |
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| 基金项目： | Project (No. 2004CB418505) supported by the National Basic Research Program (973) of China |
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| 摘 要： | This study investigated the removal and transformation of organic matter through laboratory-scale soil-aquifer treatment (SAT) soil columns over a 110-day period. Reductions in total organic carbon (TOC), dissolved organic carbon (DOC), biodegradable dissolved organic carbon (BDOC), nonbiodegradable dissolved organic carbon (NBDOC) and absorbance of ul-traviolet light at 254 nm (UV-254) averaged 71.46%, 68.05%, 99.31%, 33.27% and 38.96% across the soil columns, respectively. DOC/TOC ratios increased slightly with depth while BDOC/DOC ratios showed a converse trend. DOC exiting the soil-column system contained only a very small biodegradable fraction. SAT decreased the concentration of DOC present in feed water but increased its aromaticity, as indicated by specific ultraviolet light absorbance (SUVA), which increased by 50%～115% across the soil columns, indicating preferential removal of non-aromatic DOC during SAT. Overall, laboratory-scale SAT reduced triha-lomethane formation potential (THMFP), although specific THMFP increased. THMFP reduction was dominated by removal in chloroform. All samples exhibited a common general relationship with respect to weight: chloroform>dichlorobromomethane >dibromochloromethane>bromoform.
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| 收稿时间： | 19 December 2006 |
| 修稿时间： | 5 January 2007 |
Removal and transformation of organic matter during soil-aquifer treatment |
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| Authors: | ZHAO Qing-liang XUE Shuang YOU Shi-jie WANG Li-na |
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| Institution: | (1) School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, China |
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| Abstract: | This study investigated the removal and transformation of organic matter through laboratory-scale soil-aquifer treatment (SAT)
soil columns over a 110-day period. Reductions in total organic carbon (TOC), dissolved organic carbon (DOC), biodegradable
dissolved organic carbon (BDOC), nonbiodegradable dissolved organic carbon (NBDOC) and absorbance of ultraviolet light at
254 nm (UV-254) averaged 71.46%, 68.05%, 99.31%, 33.27% and 38.96% across the soil columns, respectively. DOC/TOC ratios increased
slightly with depth while BDOC/DOC ratios showed a converse trend. DOC exiting the soil-column system contained only a very
small biodegradable fraction. SAT decreased the concentration of DOC present in feed water but increased its aromaticity,
as indicated by specific ultraviolet light absorbance (SUVA), which increased by 50%∼115% across the soil columns, indicating
preferential removal of non-aromatic DOC during SAT. Overall, laboratory-scale SAT reduced trihalomethane formation potential
(THMFP), although specific THMFP increased. THMFP reduction was dominated by removal in chloroform. All samples exhibited
a common general relationship with respect to weight: chloroform>dichlorobromomethane >dibromochloromethane>bromoform.
Project (No. 2004CB418505) supported by the National Basic Research Program (973) of China |
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| Keywords: | Soil-aquifer treatment (SAT) Organic matter Dissolved organic matter Trihalomethane formation potential Biodegradable dissolved organic carbon (BDOC) Specific trihalomethane formation potential |
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