Treatment wetlands for landfill leachates - case studies from Norway
DOI:
https://doi.org/10.15626/Eco-Tech.2001.009Abstract
The paper describes operational experiences of landfill leachate treatment systems at three
Norwegian landfill sites, with emphasis on the reduction of COD, nitrogen and Fe
concentrations. The leachate systems described consist of aerated lagoons with aspirator
propeller aerators/mixers, and horizontal subsurface flow treatment wetlands. Results of
leachate monitoring and treatment efficiencies are presented. Operational data show that
leachate treatment with aerated lagoons has problems with removal of organic matter and
nitrogen, but remove Fe. Failure seems to depend on high loads (especially in winter times),
sludge erosion and toxicity. The hydraulic retention time should to be >20 days to keep the
nitrifiers in the lagoon during periods with low temperatures. Simple filtration techniques
with e.g. bark, shell or coral sand, crushed concrete and others can improve leachate quality
both during and after other treatment stages and remove nitrogen, colour, heavy metals,
organic pollutants and pesticides, and buffer pH and add other nutrients. A combination of
aeration, dams and filtering techniques probably gives the best treatment options.
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References
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