Reduction of nitrogen discharges in mining processes and mitigating its environmental impact miNing

Reference number 2014-01134
Coordinator Sveriges Lantbruksuniversitet - Institutionen för vatten och miljö
Funding from Vinnova SEK 5 526 000
Project duration July 2014 - December 2018
Status Ongoing
Venture The strategic innovation programme for mining and metal recovery – STRIM
Call 2014-00836-en

Purpose and goal

The overall expected result of miNing is the identification of biological treatment techniques that successfully remove reactive nitrogen from mine site drainage, so recipient concentrations are maintained at levels that are in agreement with national and international legislation.

Expected results and effects

miNing is expected to result in treatment methods for mining process water that can be implemented in full scale so that nitrogen concentrations in recipients are in agreement with national and international legislation. The treatment methods are expected to be generally applicable for mining in northern areas with cold climate. Since the tests are performed at the LKAB mine in Kiruna, miNing is expected to contribute to also solve the N-problem at that mining site.

Planned approach and implementation

miNing develops a series of treatment systems that can be used independently or in combination for the purpose of removing nitrogen from mine discharge waters. The systems will involve passive or semi-passive treatment methods that require only a minimal amount of energy to maintain in operation. These systems rely on the activity of efficient microbial communities that transform nitrogen compounds to harmless nitrogen gas (N2). The systems will be evaluated in pilot scale at LKAB´s site in Kiruna.

External links

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