Aerobic and anaerobic microbial dissolution of toxic metals from coal residues

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5951508

Francis, A J; Dodge, C J; Krishna, C R

Aerobically, native autotrophic bacteria solubilized varying amounts of As, Cr, Cu, Mn, Ni, Pb, and Zn. Dissolution of the above metals was increased by severalfold when inorganic nutrients N and P were supplemented. Under anaerobic conditions native anaerobic bacteria solubilized significant amounts of Fe, Cr, and Mn when amended with carbon and nitrogen. Selective chemical extraction analyses of coal residues indicate the association of most trace metals with pyrite, Fe-oxide, and a soluble phase, possibly ferric sulfate. These results indicate that the predominant mechanism of microbial dissolution of metals from coal residues under aerobic conditions is direct bacterial oxidation of pyrite and acid production; under anaerobic conditions is due to direct bacterial reduction of iron and manganese oxides and release of trace metals coprecipitated with the oxides. 1 fig.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5951508
• Report Number(s): BNL-40141; CONF-870773-3; ON: DE87014284
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
010900 -- Coal
Lignite
& Peat-- Environmental Aspects
AEROBIC CONDITIONS
ANAEROBIC CONDITIONS
ARSENIC
BACTERIA
BIODEGRADATION
CHEMICAL REACTIONS
CHROMIUM
COPPER
DATA
DECOMPOSITION
DISSOLUTION
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
LEAD
MANGANESE
METALS
MICROORGANISMS
MINERAL WASTES
NICKEL
NUMERICAL DATA
OXIDATION
REDUCTION
SEMIMETALS
SOLID WASTES
TRANSITION ELEMENTS
WASTES
ZINC