Case studies / Water treatment

Marja Liisa Räisänen¹, Elina Merta² & Clayton Larkins, ¹Geological Survey of Finland, P.O.Box 1237, FI-7021 Finland, e-mail: marja-liisa.raisanen(at)gtk.fi, clayton.larkins(at)gtk.fi; ²VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044 VTT, Finland, elina.merta(at)vtt.fi

In these pages, case studies of water treatment have been collected to provide data on the performance of the closure technologies. Case studies presented will show both successful and unsuccessful use of various technologies. Presented technologies include both active and passive water treatment methods.

Case studies with passive water treatment methods in mine closure

• Wetland treatment in former settling pond – Enonkoski mine site
• Biological sulphate redution of mine water – Hammaslahti mine site
• Constructed wetland – Luikonlahti mine site
• Wetland treatment in former settling pond – Vihanti mine site

Case studies with active water treatment methods in mine closure

• eMalahleni water treatment plant – reverse osmosis and brine treatment
• Wellington-Oro mine water treatment plant – sulphide precipitation
• Britannia Mine, British Columbia Canada – Water management techniques and active water treatment after closure