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Transport and biodegradation of creosote compounds in clayey till, a field experiment
Journal article   Peer reviewed

Transport and biodegradation of creosote compounds in clayey till, a field experiment

K Broholm, B Nilsson, Roy C Sidle and E Arvin
Journal of Contaminant Hydrology, Vol.41(3-4), pp.239-260
2000
DOI: https://doi.org/10.1016/S0169-7722(99)00082-0
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https://doi.org/10.1016/S0169-7722(99)00082-0View
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Abstract

field experiment creosote compounds biodegradation transport fractured clayey till
The transport and biodegradation of 12 organic compounds (toluene, phenol, o-cresol, 2,6-, 3,5-dimethylphenol, naphthalene, 1-methylnaphthalene, benzothiophene, dibenzofuran, indole, acridine, and quinoline) were studied at a field site located on the island of Funen, Denmark, where a clayey till 10-15 m deep overlies a sandy aquifer. The upper 4.8 m of till is highly fractured and the upper 2.5 m contains numerous root and worm holes. A 1.5-2 m thick sand lens is encountered within the till at a depth of 4.8 m. Sampling points were installed at depths of 2.5 m, 4 m, and in the sand lens (5.5 m) to monitor the downward migration of a chloride tracer and the organic compounds. Water containing organic compounds and chloride was infiltrated into a 4 m x 4.8 m basin at a rate of 8.8 m3 day-1 for 7 days. The mass of naphthalene relative to chloride was 0.39-0.98 for the sampling points located at a depth of 2.5 m, 0.11-0.61 for the sampling points located at a depth of 4 m, and 0-0.02 for the sampling points located in the sand lens. A similar pattern was observed for eight organic compounds for which reliable results were obtained (toluene, phenol, o-cresol, 2,6-, 3,5- dimethylphenol, 1-methylnaphthalene, benzothiophene, and quinoline). This shows that the organic compounds were attenuated during the downward migration through the till despite the high infiltration rate. The attenuation process may be attributed to biodegradation.

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Environmental Sciences
Geosciences, Multidisciplinary
Water Resources
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