Treatment and reuse of coal conversion wastewaters
This paper presents a synopsis of recent experimental activities to evaluate processing characteristics of coal conversion wastewaters. Treatment studies have been performed with high-BTU coal gasification process quench waters to assess enhanced removal of organic compounds via powdered activated carbon-activated sludge treatment, and to evaluate a coal gasification wastewater treatment train comprised of sequential processing by ammonia removal, biological oxidation, lime-soda softening, granular activated carbon adsorption, and reverse osmosis. In addition, treatment studies are in progress to evaluate solvent extraction of gasification process wastewater to recover phenolics and to reduce wastewater loading of priority organic pollutants. Biological oxidation of coal gasification wastewater has shown excellent removal efficiencies of major and trace organic contaminants at moderate loadings, addition of powdered activated carbon provides lower effluent COD and color. Gasification process wastewater treated through biological oxidation, lime-soda softening and activated carbon adsorption appears suitable for reuse as cooling tower make-up water. Solvent extraction is an effective means to reduce organic loadings to downstream processing units. In addition, preliminary results have shown that solvent extraction removes chromatographable organic contaminants to low levels.
- Research Organization:
- Carnegie-Mellon Univ., Pittsburgh, PA (USA). Dept. of Civil Engineering
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- DOE Contract Number:
- AC18-80FC10157
- OSTI ID:
- 6893634
- Report Number(s):
- CONF-8009103--1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010404 -- Coal
Lignite
& Peat-- Gasification
010800* -- Coal
Lignite
& Peat-- Waste Management
ACTIVATED CARBON
ACTIVATED SLUDGE PROCESS
ADSORBENTS
ADSORPTION
BIODEGRADATION
CARBON
CHEMICAL OXYGEN DEMAND
CHEMICAL REACTIONS
CHROMATOGRAPHY
COAL GASIFICATION PLANTS
DECOMPOSITION
ELEMENTS
EXTRACTION
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
HIGH BTU GAS
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
LIQUID WASTES
MANAGEMENT
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PROCESSING
RECYCLING
REMOVAL
SEPARATION PROCESSES
SOLVENT EXTRACTION
SORPTION
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER