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- Title
Laboratory-Scale Bio-Treatment of Real Arsenic-Rich Acid Mine Drainage.
- Authors
Battaglia-Brunet, Fabienne; Casiot, Corinne; Fernandez-Rojo, Lidia; Hery, Marina; Le Pape, Pierre; Tris, Hafida; Morin, Guillaume; Touzé, Solène; Joulian, Catherine
- Abstract
Acid mine drainage (AMD) still represents a huge environmental problem. Technical and scientific breakthroughs are still needed to decrease environmental damages, treatment cost, and waste production associated with AMD. The feasibility of combining continuously fed anaerobic sulfate-reducing bioreactor with downstream iron oxidation step was tested, at a laboratory scale, with two types of real arsenic-rich AMD waters from the site of Carnoulès (France), that differed in acidity (pH 3.3 and 4.0), arsenic (As, 18 and 174 mg.L−1), and metal concentrations. Iron remained in solution, while up to 99% of As was precipitated as amorphous orpiment in the anaerobic sulfate-reducing bioreactor. Zinc (Zn) precipitation was also observed, up to 99%; however, the efficiency of Zn precipitation was less stable than that of As. The anaerobic bioreactor presented a stable bacterial community including a Desulfosporosinus-related sulfate reducer. When the effluents from the anaerobic process step were treated in a laboratory aerobic bioreactor, iron was oxidized efficiently. The feasibility of efficient orpiment bio-precipitation coupled with downstream iron oxidation was shown, thus opening the perspective of a low-cost combination of treatment steps for the removal of arsenic, zinc, and iron in As-rich AMDs.
- Subjects
ACID mine drainage; ANAEROBIC reactors; ARSENIC removal (Water purification); IRON oxidation; ENVIRONMENTAL degradation; IRON removal (Water purification); BACTERIAL communities
- Publication
Water, Air & Soil Pollution, 2021, Vol 232, Issue 8, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-021-05276-z