Potential for natural and enhanced attenuation of sulphanilamide in a contaminated chalk aquifer

Bennett, Karen A., Kelly, Simon D., Tang, Xiangyu and Reid, Brian J. (2017) Potential for natural and enhanced attenuation of sulphanilamide in a contaminated chalk aquifer. Journal of Environmental Sciences, 62. pp. 39-48. ISSN 1001-0742

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    Abstract

    Understanding antibiotic biodegradation is important to the appreciation of their fate and removal from the environment. In this research an Isotope Ratio Mass Spectrometry (IRMS) method was developed to evaluate the extent of biodegradation of the antibiotic, sulphanilamide, in contaminated groundwater. Results indicted an enrichment in δ13C of 8.44‰ from − 26.56 (at the contaminant source) to − 18.12‰ (300 m downfield of the source). These results confirm reductions in sulphanilamide concentrations (from 650 to 10 mg/L) across the contaminant plume to be attributable to biodegradation (56%) vs. other natural attenuation processes, such as dilution or dispersion (42%). To understand the controls on sulphanilamide degradation ex-situ microcosms assessed the influence of sulphanilamide concentration, redox conditions and an alternative carbon source. Results indicated, high levels of anaerobic capacity (~ 50% mineralisation) to degrade sulphanilamide under high (263 mg/L), moderate (10 mg/L) and low (0.02 mg/L) substrate concentrations. The addition of electron acceptors; nitrate and sulphate, did not significantly enhance the capacity of the groundwater to anaerobically biodegrade sulphanilamide. Interestingly, where alternative carbon sources were present, the addition of nitrate and sulphate inhibited sulphanilamide biodegradation. These results suggest, under in-situ conditions, when a preferential carbon source was available for biodegradation, sulphanilamide could be acting as a nitrogen and/or sulphur source. These findings are important as they highlight sulphanilamide being used as a carbon and a putative nitrogen and sulphur source, under prevailing iron reducing conditions.

    Item Type: Article
    Uncontrolled Keywords: antibiotics,sulphonamide,groundwater contamination,biodegradation,stable isotope fractionation,irms
    Faculty \ School: Faculty of Science > School of Environmental Sciences
    Depositing User: Pure Connector
    Date Deposited: 17 Oct 2017 06:06
    Last Modified: 09 Apr 2019 12:41
    URI: https://ueaeprints.uea.ac.uk/id/eprint/65151
    DOI: 10.1016/j.jes.2017.08.010

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