Ferrous iron oxidation by Thiobacillus ferrooxidans: inhibition with benzoic acid, sorbic acid and sodium lauryl sulfate
Acid mine drainage is formed by the weathering or oxidation of pyritic material exposed during coal mining. The rate of pyritic material oxidation can be greatly accelerated by certain acidophilic bacteria such as Thiobacillus ferrooxidans which catalyse the oxidation of ferrous to ferric iron. A number of organic compounds, under laboratory conditions, can apparently inhibit both the oxidation of ferrous to ferric iron by T. ferrooxidans and the weathering of pyritic material by mixed cultures of acid mine drainage micro-organisms. Sodium lauryl sulphate (SLS), an anionic surfactant has proved effective in this respect. Benzoic acid, sorbic acid and SLS at low concentrations, each effectively inhibited bacterial oxidation of ferrous iron in batch cultures of T. ferrooxidans. The rate of chemical oxidation of ferrous iron in low pH, sterile, batch reactors was not substantially affected at the tested concentrations of any of the compounds.
- OSTI ID:
- 6099179
- Journal Information:
- Appl. Environ. Microbiol.; (United States), Vol. 48:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
PYRITE
OXIDATION
THIOBACILLUS FERROXIDANS
INHIBITION
ACID MINE DRAINAGE
BENCH-SCALE EXPERIMENTS
BENZOIC ACID
CATALYSIS
COAL MINING
MINERAL WASTES
SODIUM SULFATES
SORBIC ACID
SURFACTANTS
WASTE MANAGEMENT
ALKALI METAL COMPOUNDS
BACILLUS
BACTERIA
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
IRON COMPOUNDS
IRON SULFIDES
MANAGEMENT
MICROORGANISMS
MINERALS
MINING
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
SODIUM COMPOUNDS
SOLID WASTES
SULFATES
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SULFUR-OXIDIZING BACTERIA
TRANSITION ELEMENT COMPOUNDS
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
550700 - Microbiology