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  • Effect of temperature, pH and illumination on abiotic degradation of oxytetracycline in sterilized swine manure

    Author(s)
    Ratasuk, Nopawan
    Boonsaner, Maliwan
    Hawker, Darryl W
    Griffith University Author(s)
    Hawker, Darryl W.
    Year published
    2012
    Metadata
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    Abstract
    Tetracyclines such as oxytetracycline (OTC) are widely used veterinary chemicals. They are often poorly absorbed with a significant fraction being excreted in manure that can subsequently result in environmental contamination. In many countries throughout South East Asia swine manure is not composted, but sun-dried. Using sunlight to heat manure has been suggested as an effective and low-cost strategy to reduce OTC contamination, but this has previously been unexplored. Such conditions have also been shown to reduce bacterial numbers inmanuremeaning abioticOTC degradation processesmay become more significant. This work ...
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    Tetracyclines such as oxytetracycline (OTC) are widely used veterinary chemicals. They are often poorly absorbed with a significant fraction being excreted in manure that can subsequently result in environmental contamination. In many countries throughout South East Asia swine manure is not composted, but sun-dried. Using sunlight to heat manure has been suggested as an effective and low-cost strategy to reduce OTC contamination, but this has previously been unexplored. Such conditions have also been shown to reduce bacterial numbers inmanuremeaning abioticOTC degradation processesmay become more significant. This work investigated for the first time, the role of temperature, illumination and pH in the abiotic degradation of OTC in sterilized swine manure. OTC loss from laboratory-based experiments simulating conditions likely to be experienced in sun-drying were assessed using simple first order and availability-adjusted loss models. ANOVA results suggested that neither model was superior to the other. In addition, pH and light had little influence. Temperature was shown to be the main factor influencing OTC loss. Kinetic results showed reductions in OTC concentrations of 65 % after 100 h at 40?C based on the availability-adjusted loss model, regardless of pH and illumination. Such temperatures are likely to be attained during the process of sun-drying. Therefore this may be a useful and practical means of reducing OTC contamination in manure.
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    Journal Title
    Journal of Environmental Science and Health. Part A: Toxic/Hazardous Substances and Environmental Engineering
    Volume
    47
    Issue
    11
    DOI
    https://doi.org/10.1080/10934529.2012.687274
    Subject
    Atmospheric composition, chemistry and processes
    Publication URI
    http://hdl.handle.net/10072/47584
    Collection
    • Journal articles

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