Biological treatment of nitrate wastewater using fluidized-bed bioreactors
- Oak Ridge National Lab., TN
Fluidized-bed bioreactors were tested as processes for denitrifying process wastewaters at flows of 23 m/sup 3//d (0.2-m-diam column) and 166 m/sup 3//d (0.5-mm-diam column). A mixed denitrifying culture obtained from garden soil was used as an inoculum for the bioreactors; films of denitrifying bacteria were allowed to form on 0.25 to 0.50-mm-diam anthracite coal particles that were fluidized in the bioreactor. As average nitrate concentrations were increased from ca. 1000 to 2500 g/m/sup 3/, denitrification rates increased from 25 to 48 kg nitrate-nitrogen/d m/sup 3/ for 11-min hydraulic retention times. These rates appeared to be independent of column diameter. Two 0.2-m-diam bioreactors operated in series on influent nitrate concentrations of 2000 g/m/sup 3/ could produce nitrate effluent concentrations less than or equal to 44 g/m/sup 3/.
- OSTI ID:
- 5267967
- Report Number(s):
- CONF-810554-
- Journal Information:
- Biotechnol. Bioeng. Symp.; (United States), Vol. 11; Conference: 3. symposium on biotechnology in energy production and conservation, Gatlinburg, TN, USA, 12 May 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
WASTE WATER
DENITRIFICATION
BACTERIA
CHEMICAL REACTORS
FLUIDIZED BED
LIQUID WASTES
NITRATES
PILOT PLANTS
CHEMICAL REACTIONS
FUNCTIONAL MODELS
HYDROGEN COMPOUNDS
MICROORGANISMS
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
WASTES
WATER
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management