Biological manganese removal from acid mine drainage in constructed wetlands and prototype bioreactors

Mine drainage waters vary considerably in the range and concentration of heavy metals they contain. Besides iron, manganese is frequently present at elevated concentrations in waters draining both coal and metal mines. Passive treatment systems (aerobic wetlands and compost bioreactors) are designed...

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Bibliographic Details
Published in:The Science of the total environment 2005-02, Vol.338 (1), p.115-124
Main Authors: Hallberg, Kevin B., Johnson, D. Barrie
Format: Article
Language:English
Subjects:
Acid mine drainage
Bacteria - metabolism
Bioreactors
Bioremediation
Ecosystem
Environmental Microbiology
Filtration
Iron - metabolism
Manganese
Manganese - isolation & purification
Manganese - metabolism
Manganese-oxidizing bacteria
Mining
Oxidation-Reduction
Pilot Projects
United Kingdom
Waste Management - methods
Water Pollutants, Chemical - isolation & purification
Water Pollutants, Chemical - metabolism
Wetland
Wheal Jane
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Summary:Mine drainage waters vary considerably in the range and concentration of heavy metals they contain. Besides iron, manganese is frequently present at elevated concentrations in waters draining both coal and metal mines. Passive treatment systems (aerobic wetlands and compost bioreactors) are designed to remove iron by biologically induced oxidation/precipitation. Manganese, however, is problematic as it does not readily form sulfidic minerals and requires elevated pH (>8) for abiotic oxidation of Mn (II) to insoluble Mn (IV). As a result, manganese removal in passive remediation systems is often less effective than removal of iron. This was found to be the case at the pilot passive treatment plant (PPTP) constructed to treat water draining the former Wheal Jane tin mine in Cornwall, UK, where effective removal of manganese occurred only in one of the three rock filter components of the composite systems over a 1-year period of monitoring. Water in the two rock filter systems where manganese removal was relatively poor was generally
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2004.09.011