Biological sulfate reduction using gas-lift reactors fed with hydrogen and carbon dioxide as energy and carbon source
- Wageningen Agricultural Univ. (Netherlands). Dept. of Environmental Technology
Feasibility and engineering aspects of biological sulfate reduction in gas-lift reactors were studied. Hydrogen and carbon dioxide were used as energy and carbon source. Attention was paid to biofilm formation, sulfide toxicity, sulfate conversion rate optimization, and gas-liquid mass transfer limitations. Sulfate-reducing bacteria formed stable biofilms on pumice particles. Biofilm formation was not observed when basalt particles were used. However, use of basalt particles led to the formation of granules of sulfate-reducing biomass. The sulfate-reducing bacteria, grown on pumice, easily adapted to free H[sub 2]S concentrations up to 450 mg/L. Biofilm growth rate then equilibrated biomass loss rate. These high free H[sub 2]S concentrations caused reversible inhibition rather than acute toxicity. When free H[sub 2]S concentrations were kept below 450 mg/L, a maximum sulfate conversion rate of 30 g SO[sub 4][sup 2[minus]]/L [center dot] d could be achieved after only 10 days of operation. Gas-to-liquid hydrogen mass transfer capacity of the reactor determined the maximum sulfate conversion rate.
- OSTI ID:
- 7145371
- Journal Information:
- Biotechnology and Bioengineering; (United States), Vol. 44:5; ISSN 0006-3592
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
HYDROGEN SULFIDES
TOXICITY
SULFATE-REDUCING BACTERIA
GROWTH
SULFATES
BIODEGRADATION
BIOREACTORS
REMEDIAL ACTION
SOLID WASTES
TECHNOLOGY ASSESSMENT
BACTERIA
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
HYDROGEN COMPOUNDS
MICROORGANISMS
OXYGEN COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
WASTES
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)
560300 - Chemicals Metabolism & Toxicology