Biological treatment of Hygas coal gasification wastewater

Technical Report · Fri Dec 01 04:00:00 EST 1978

OSTI ID:5291460

Luthy, R G; Tallon, J T

An 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. A literature review showed that there are differences in wastewater characteristics between coke plant weak ammonia liquors and high strength coal gasification process effluents. The available data base for design of coke plant biological treatment facilities is deficient; therefore, it is not possible to transfer other than general observations on biological treatment of coke plant effluents to biological treatment of coal gasification process effluents.

• Research Organization: Carnegie-Mellon Univ., Pittsburgh, PA (USA). Dept. of Civil Engineering
• DOE Contract Number: EX-76-S-01-2496
• OSTI ID: 5291460
• Report Number(s): FE-2496-43
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
010800* -- Coal
Lignite
& Peat-- Waste Management
ACTIVATED SLUDGE PROCESS
AMMONIA
AROMATICS
BORON
CARBONIC ACID DERIVATIVES
CHEMICAL EFFLUENTS
COAL GASIFICATION
COKING PLANTS
CYANIDES
DATA
DATA FORMS
ELEMENTS
EXPERIMENTAL DATA
FUNCTIONAL MODELS
GASIFICATION
GRAPHS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
HYGAS PROCESS
INDUSTRIAL PLANTS
INFORMATION
LIQUID WASTES
MANAGEMENT
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PHENOL
PHENOLS
PHOSPHORUS
PILOT PLANTS
PROCESSING
RECOMMENDATIONS
REMOVAL
SEMIMETALS
SNG PROCESSES
TABLES
TESTING
THERMOCHEMICAL PROCESSES
THIOCYANATES
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER
WATER TREATMENT