Experimental analysis of biological oxidation characteristics of Hygas coal gasification wastewater. [Including pretreatment]
An eight month experimental study was performed to assess biological treatability characteristics of Hygas coal gasification process pilot plant wastewater comprised of cyclone and quench condensates. The study evaluated treatability characteristics of ammonia-stripped and unstripped wastewater at full strength and at 1:1 dilution. It was determined that minimum pretreatment required for biological oxidation consisted of reducing wastewater alkalinity, and decreasing raw ammonia concentration by dilution or by stripping. Kinetic studies with stripped Hygas wastewater showed the waste could be processed at mean cell residence times varying from 10 to 40 days with hydraulic residence times of 2 to 3 days; the bacteriological yield coefficient was 0.11 (COD basis), and the decay coefficient was 0.02/day. The study also determined correlations for dissolved oxygen uptake, the effect of COD removal rate on zone settling velocity and sludge volume index, removal efficiencies for various constituents, and adsorption isotherms for biological effluent COD on activated carbon and process char. Nitrification was completely inhibited in this study; it was suspected that this was due to high wastewater boron concentration (80 to 110 mg/l), however additional testing at lower loadings is required to confirm this observation. Hygas wastewater seemed to inhibit bacteriological growth because mean cell residence times less than 10 days do not appear feasible and because apparently higher yield coefficients were observed with diluted wastewater.
- Research Organization:
- Carnegie-Mellon Univ., Pittsburgh, PA (USA). Environmental Studies Inst.
- DOE Contract Number:
- EX-76-S-01-2496
- OSTI ID:
- 6559744
- Report Number(s):
- FE-2496-27
- Country of Publication:
- United States
- Language:
- English
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54 ENVIRONMENTAL SCIENCES
ACTIVATED SLUDGE PROCESS
AMMONIA
BENCH-SCALE EXPERIMENTS
BIODEGRADATION
BORON
CHARS
CHEMICAL REACTIONS
COAL GASIFICATION
COAL GASIFICATION PLANTS
DECOMPOSITION
ELEMENTS
FUNCTIONAL MODELS
GASIFICATION
GROWTH
HYDRIDES
HYDROGEN COMPOUNDS
HYGAS PROCESS
INDUSTRIAL PLANTS
INHIBITION
LIQUID WASTES
MANAGEMENT
MATHEMATICAL MODELS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PILOT PLANTS
POLLUTION CONTROL
PROCESSING
PYROLYSIS PRODUCTS
REMOVAL
SEMIMETALS
SNG PROCESSES
SORPTIVE PROPERTIES
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER
WATER POLLUTION CONTROL
WATER TREATMENT