Inhibition and recovery in a fixed microbial film leachate treatment system subject to shock loading of copper and zinc

John Scullion, Michael K. Winson, Richard Matthews

Research output: Contribution to journalArticlepeer-review

27 Citations (SciVal)

Abstract

The impacts of shock loadings of copper and zinc (up to 50 mg l−1) on the treatment efficiency of a mesoscale-fixed microbial film landfill leachate treatment system were investigated. Treatment inhibition and recovery were monitored in sequence over two 36 h experimental runs. The fate of added metals was also investigated. Copper, and to a lesser extent zinc, added to the treatment systems accumulated on the biofilm media. Increasing copper inputs (>10 mg l−1) progressively inhibited biological treatment of ammoniacal-nitrogen and carbon; this inhibition persisted into the recovery phase for nitrogen but not for carbon. Only the highest input of zinc affected media metal contents and carbon treatment rates; the latter inhibitory effect did not persist into the recovery phase. A small proportion of the metals accumulated on the biofilm media during the inhibition phase was released into the bulk leachate during the recovery experiment. These findings suggest a need to manage metal inputs into leachate treatment systems in order to ensure their continued efficacy.
Original languageEnglish
Pages (from-to)4129-4138
Number of pages10
JournalWater Research
Volume41
Issue number18
Early online date03 Jun 2007
DOIs
Publication statusPublished - Oct 2007

Keywords

  • Landfill leachate treatment
  • inhibition-recovery
  • fixed biofilm
  • copper-zinc

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