An economic analysis of leachate purification through willow-coppice vegetation filters

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Abstract

In this study an economic analysis of the purification of integrated solid waste treatment facility leachates through a willow-coppice (Salix) vegetation filter in southern Sweden was carried out. Calculations were based on the use of two computer models that were initially used in estimating a pump-and-pipe irrigation system for a 36-ha willow-coppice plantation to purify an average annual quantity of 195,000 m(3) of leachate with an average nitrogen content of 24 g/m(3). Results showed that facility leachates could be purified at US$0.34/m(3) compared with US$0.62/m(3) for that of conventional leachate treatment at a wastewater treatment plant. Furthermore, results revealed that the increased income from willow growing and sale of the biomass chips represented only a small factor in the overall cost of the purification technique - decreasing purification costs to US$0.326/m(3). Sensitivity analyses also demonstrated that, because of the large leachate holding pond expense, only a fraction of facility leachate should be treated through a vegetation filter.

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Subject classification (UKÄ) – MANDATORY

  • Social Sciences Interdisciplinary

Keywords

  • economic calculations, Salix, willow-coppice crops, vegetation filter, landfill leachates, leachate purification
Original languageEnglish
Pages (from-to)321-329
JournalBioresource Technology
Volume94
Issue number3
Publication statusPublished - 2004
Publication categoryResearch
Peer-reviewedYes