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The University of Southampton

Research project: Treatment, Extraction and Reuse of Chemically Complex Alkaline Leachates from Landfills

Currently Active: 

Landfill Tax Credit Scheme

The research aimed to

  • determine the factors limiting conventional methods of extracting complex alkaline leachates from landfills
  • develop possible treatment methods for complex alkaline leachates
  • investigate the potential of complex alkaline leachates to accelerate the degradation of MSW and to purify landfill gas
Leachate treatment

The effect of different dose concentrations of FeCl3 on the performance of a mesophilic anaerobic digester treating the leachate was tested. The result indicated that sulphate reduction was the predominant reaction: as a consequence dissolved sulphide concentration reached 500 mg/l and methanogenic processes were entirely inhibited. Dosing with FeCl3 restored some methanogenic activity and also improved the rates of sulphate reduction. A combination of sulphate reduction and methanogenic activity resulted in up to 75% COD removal and 80% sulphate removal. Sulphate reduction remained the principle mechanism by which COD removal took place with a methane yield of only between 0.14 and 0.18 litres CH4 /kg/ COD removed being achieved. The process was however stable and offered advantages for the further treatment of the leachate.



Related research groups

Water and Environmental Engineering Group
Investigating a leachate well on site
Investigating a leachate well
Lab scale reactors for leachate treatment trails
Lab scale reactors for leachate
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