Anaerobic treatment of gasifier effluent: Final report. [Organic carbon]
Studies have been conducted to determine the biological treatability of coal gasification effluent for removal of organic carbon and ammonia. The treatment system consisted of an anaerobic activated carbon filter for organic carbon removal followed by a single stage nitrification system followed by a biological denitrification reactor. Dilute (approx.10%) wastewater was successfully treated over an extended period of time. However, after extended operation (approx. one year) inhibition of the biological system was encountered. This inhibition could be overcome by periodic replacement of a portion of the granular activated carbon contact media. Attempts to utilize the anaerobic system to treat solvent extracted ammonia stripped coal gasification effluent to remove substituted hydantoins was of limited success. Removals of 50% of the influent hydantoins were realized but only very small amounts of gas were produced. Apparently the primary removal mechanism was by adsorption on the granular activated carbon. Batch inhibition studies showed substituted pyridines as the primary inhibitory compounds in the raw wastewater. Carbon adsorption-solvent regeneration for hydantoin removal did not appear to be a viable treatment alternative due to low adsorption capacities and incomplete regeneration of the activated carbon. 37 refs., 63 figs., 23 tabs.
- Research Organization:
- Georgia Inst. of Tech., Atlanta (USA). School of Civil Engineering
- DOE Contract Number:
- AC21-81FC10297
- OSTI ID:
- 6439734
- Report Number(s):
- DOE/FC/10297-2334; ON: DE87001099
- Country of Publication:
- United States
- Language:
- English
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ACTIVATED CARBON
ADSORBENTS
ADSORPTION
AMMONIA
ANAEROBIC CONDITIONS
AZOLES
CARBON
COAL GASIFICATION PLANTS
DATA
ELEMENTS
EXPERIMENTAL DATA
EXTRACTION
FILTERS
HETEROCYCLIC COMPOUNDS
HYDANTOINS
HYDRIDES
HYDROGEN COMPOUNDS
IMIDAZOLES
INDUSTRIAL PLANTS
INFORMATION
LIQUID WASTES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
REMOVAL
SEPARATION PROCESSES
SOLVENT EXTRACTION
SORPTION
WASTE WATER
WASTES
WATER
WATER TREATMENT