Natural attenuation of herbicides: Importance of growth-based degradation

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Abstract

A field injection experiment in a sandy, aerobic aquifer showed that two phenoxy acids MCPP (mecoprop) and dichlorprop were degraded within I in downgradient of the injection wells after an apparent lag period. The plume development and microbial measurements indicated that microbial growth governed degradation. The results were satisfactorily described by a newly developed three-dimensional reactive solute transport model including growth based degradation kinetics. The model was applied at a larger scale to simulate the effect of growth kinetics on a release of phenoxy acids. The results revealed an efficient removal of phenoxy acids close to the source. However, a significant mass escaped during the initial growth phase and the resulting plume was only slowly degraded as short exposure time and low concentrations limited the growth of specific degraders and thereby degradation. The observations may be important for application of natural attenuation as a remedy in field scale systems.
Original languageEnglish
Title of host publicationGroundwater Quality 2001 : Natural and Enhanced Restoration of Groundwater Pollution. Selected papers
EditorsS. Thornton, S. Oswald
Place of PublicationOxfordshire, UK
PublisherIAHS Press
Publication date2002
Pages199-204
Publication statusPublished - 2002
Event3rd International Conference on Groundwater Quality - University of Sheffield, Sheffield, United Kingdom
Duration: 18 Jun 200121 Jun 2001
Conference number: 3

Conference

Conference3rd International Conference on Groundwater Quality
Number3
LocationUniversity of Sheffield
CountryUnited Kingdom
CitySheffield
Period18/06/200121/06/2001
SeriesIAHS Publication
Number275

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