Natural attenuation of herbicides: Importance of growth-based degradation

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    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
    Publication statusPublished - 2002
    Event3rd International Conference on Groundwater Quality - University of Sheffield, Sheffield, United Kingdom
    Duration: 18 Jun 200121 Jun 2001
    Conference number: 3


    Conference3rd International Conference on Groundwater Quality
    LocationUniversity of Sheffield
    Country/TerritoryUnited Kingdom
    SeriesIAHS Publication


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