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Phenolic compounds are commonly found contaminants in groundwater systems. In this research the sorption and biodegradation of phenol, 2, 4-d ichlorophenol (2,4-DCP) and pentachlorophenol (PCP) were investigated. The soil materials used were characterized as fine grained sands with negligible organic carbon contents. Freundlich sorption coefficients of 0.0158 for phenol and 0.0547 for 2,4-DCP were found. Pentachlorophenol was more strongly adsorbed with an adsorption coefficient of 1.12. In multi-compound systems competitive sorption was evident, and adsorption capacities were reduced by a margin ranging from 70% for phenol to 30% for both DCP and PCP. All three compounds exhibited nonlinear sorption behavior with a range of exponent values from 0.56 to 0.7. Desorption coefficients showed little difference from adsorption for phenol and 2,4-DCP, but were significantly different for PCP, indicating hysteresis of PCP sorptions. The retardation factors were 1.03 for phenol, 1.16 for 2,4- DCP and 2.26 for PCP. In batch biodegradation studies using indigenous soil bacteria phenol degraded quickly (t., _ = 12 hours) and was completely destroyed within three days. 2,4-DCP was also complet

Author

Lin, Chen Hsin, 1953-

Publisher

1988.

Published

1988

Language

EN