Effects of physical parameters of a gravel bed on the activity of sulphate-reducing bacteria in the presence of acid mine drainage

  • Lyew D
  • Sheppard J
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Abstract

he use of sulphate-reducing bacteria (SRB) in the passive treatment of acid mine drainage (AMD) requires the presence of a sediment, such as gravel bed, in which the bacteria can establish microenvironments conducive to their survival in the presence of oxygen and acidity. The characterization of relation- ships between the physical environment and SRB activity would be useful in the sizing of passive treatment systems using SRB. The e†ects of physical parameters of a gravel bed (i.e. void volume, total surface area of gravel, type of gravel) on SRB activity while in the presence of varying loads of fresh AMD was investi- gated. SRB activity was expressed as the proportion of sulphate removed after 7 days. The study was accomplished in a series of column reactors containing beds comprising di†erent types and size classes of gravel. SRB were established in the beds and metal and sulphate removal were monitored. QuantiÐable relationships were found to exist between SRB activity and the physical parameters of the bed

Author-supplied keywords

  • Acid mine drainage
  • Gravel bed
  • Physical parameters
  • Sizing
  • Sulphate-reducing bacteria

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Authors

  • Darwin Lyew

  • John D. Sheppard

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