Biological removal of organic constituents in quench water from a slagging, fixed-bed coal-gasification pilot plant
This study is part of an effort to assess the efficiency of activated-sludge treatment for removal of organic constituents from high-Btu coal-gasification pilot-plant quench waters. A sample of raw-gas quench water was obtained from the Grand Forks Energy and Technology Center's pilot plant, which employs the slagging, fixed-bed gasification process. The quench water generated in the processing of Indian Head lignite was pretreated to reduce ammonia and alkalinity, and then diluted and subjected to long-term biological treatment, followed by detailed characterization and analysis of organic constituents. The pretreated (influent) and treated (effluent) samples were extracted using a methylene chloride, pH-fractionation method to obtain acid, base, and neutral fractions, which were analyzed by capillary-column gas chromatography/mass spectrometry (GC/MS). Over 99% of the total extractable and chromatographable organic material in the influent acid fraction was composed of phenol and alkylated phenols. Biological treatment removed these compounds almost completely. Major components of the influent base fraction were alkylated pyridines, anilines, aminopyrroles, imidazoles and/or pyrazoles, diazines, and quinolines. Removal efficiency of these compounds ranged between 90 and 100%. The influent neutral fraction was composed mainly of cycloalkanes, cycloalkenes, naphthalene, indole, acetophenone, and benzonitrile. Alkylated benzenes were generally absent. Removal efficiencies of these compounds were generally very good, except for certain alkylated cycloalkanes and cycloalkenes. Results are compared with those of a similar study on HYGAS coal-gasification quench water.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5531569
- Report Number(s):
- ANL/PAG-1
- Country of Publication:
- United States
- Language:
- English
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Biological removal of organic constituents in quench waters from high-Btu coal-gasification pilot plants
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Related Subjects
ACTIVATED SLUDGE PROCESS
PERFORMANCE TESTING
FUEL GAS
QUENCHING
ORGANIC COMPOUNDS
REMOVAL
WASTE WATER
BIODEGRADATION
AMMONIA
ANILINE
COAL GASIFICATION
EXTRACTION
GAS CHROMATOGRAPHY
HIGH BTU GAS
MASS SPECTROSCOPY
PHENOLS
PILOT PLANTS
PYRIDINES
QUINOLINES
AMINES
AROMATICS
AZINES
CHEMICAL REACTIONS
CHROMATOGRAPHY
DECOMPOSITION
FLUIDS
FUELS
FUNCTIONAL MODELS
GAS FUELS
GASES
GASIFICATION
HETEROCYCLIC COMPOUNDS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
LIQUID WASTES
MANAGEMENT
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PROCESSING
SEPARATION PROCESSES
SPECTROSCOPY
TESTING
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
WATER
010800* - Coal
Lignite
& Peat- Waste Management
010404 - Coal
Lignite
& Peat- Gasification