Closure objectives for water treatment
- Restoration of the water quality to the level that does not present any long-term risks to the environment or human health
- Long-term functioning
- Long-term stability of the treatment products/residues
- Integration with other water management measures (including management of tailings areas)
- Sufficient capacity for peak floods, adaptation to seasonal fluctuations
- Accordance with the regulative requirements (legislation, environmental and other permits)
One treatment objective can also be to enhance the use of the treated water by another party – on the other hand to decrease the need for the other party to abstract water from a natural water body and on the other hand to cover part of the treatment costs.
During last decades, a selection of water treatment technlologies have been developed, both passive and active methods, to fulfil the closure objectives. Closedure Chapter “Closure technologies” presents and evaluates in detail different water treatment techniques available for mine site water treatment, and “Case Studies” presents existing cases of the performance and applicability of these technologies.
General objectives of mine closure are described in Chapter “Mine Closure Objectives“.