Efficacy of activated sludge/powdered activated carbon for removal of organic constituents in wastewater from commercial-scale, high-Btu coal gasification plant

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:6400708

Harrison, W; Ford, D L

Bench-scale, activated-sludge (AS) treatability studies indicate that approximately 98 percent of total organic constituents can be removed from wastewater generated by HYGAS and slagging-type, high-Btu coal gasification pilot plants. This suggests that the most important unit of a wastewater treatment system for organics removal in commercial-scale versions of such plants will be the AS unit, augmented by powdered activated carbon (PAC) addition for control of refractory organics. The entire treatment train will probably have the configuration: API separator, phenol extraction, ammonia stripping, dissolved-air flotation, AS/PAC, and suspended solids separation. Taking the standard coal gasification plant as one producing 250 x 10/sup 6/ scfd of product gas, and the amount of quench and shift-condensate water delivered to the activated sludge unit as 2.8 MGD, the annual cost of removing organics by AS/PAC for such a commercial-scale plant is estimated at $2,500,000. The estimated annual energy impact for the equalization basin, the AS/PAC system, and for regeneration is estimated at 10.1 x 10/sup 6/ kWh(e), or 17.4 x 10/sup 3/ bbl crude oil equivalent. Together with the other process units in the overall treatment train, it is probable that the AS/PAC system can ensure environmental control of both major and trace organic constituents at acceptable levels. Additional bench-scale treatability studies should be conducted to confirm this supposition, however.

• Research Organization: Argonne National Lab., IL (USA); Engineering-Science, Inc., Austin, TX (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6400708
• Report Number(s): CONF-8006171-2; ON: DE81023575
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACTIVATED CARBON
ACTIVATED SLUDGE PROCESS
ADSORBENTS
AMMONIA
AROMATICS
CARBON
COAL GASIFICATION PLANTS
CONTROL
COST
ELEMENTS
EXTRACTION
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
HYGAS PROCESS
INDUSTRIAL PLANTS
LIQUID WASTES
MANAGEMENT
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHENOL
PHENOLS
POLLUTION CONTROL
PROCESSING
REMOVAL
SEPARATION PROCESSES
SNG PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER
WATER POLLUTION CONTROL
WATER TREATMENT