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REMEDIATION OF HISTORIC WASTE ROCK BY INJECTION OF GREEN LIQUOR DREGS: RESULTS FROM A FIELD SCALE TRIAL, GLADHAMMAR, SOUTHERN SWEDEN
Sartz, L., S. Sadbom, and M. Backstrom.
11th ICARD IMWA 2018 Annual Conference, September 10-14, Pretoria, South Africa. IMWA Proceedings (Volume II):1124-1129(2018)

Mining in Gladhammar, southern Sweden, started in the 15th century, generating waste rock containing copper, cobalt, and arsenic. During remediation in 2011, some waste rock was preserved, due to its geoscientific value, and placed on a geomembrane surface. Eventually, it became apparent that it had a substantial environmental impact (pH 3.8, Cu 96 mg/L, Co 21 mg/L). In 2017, green liquor dregs were injected to increase pH and decrease trace element mobility. Ten months after injection, the pH was 8.3 and concentrations of Cu and Co 1.3 mg/L and 1.1 mg/L, respectively. Evaluation will continue for at least five years. http://imwa.info/docs/imwa_2018/IMWA2018_Sartz_1124.pdf



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