Study of the treatability of wastewater from a coal gasification plant. Annual report, July 15, 1978-July 14, 1979

Technical Report · Sun Jul 01 04:00:00 EDT 1979

OSTI ID:5751290

Iglar, A F

The first year of the study of the treatability of wastewater from the Holston Coal Gasification Plant has been completed. Nearly all the wastewater is recycled to the scrubber-coolers; excess wastewater could not be measured directly, but was estimated at 685 gal/day. Samples were collected from the decanter. Analyses on the raw waste have included BOD (on pretreated), COD, TOC, total solids, total volatile solids, total suspended solids, volatile suspended solids, pH, temperature, ammonia nitrogen, thiocyanate, phenols, sulfide, alkalinity, and grease and oil. These data were analyzed as appropriate to yield mean, standard deviation, weight per day, weight per unit weight of coal consumed, and weight per unit of gas production. Study of pretreatment indicated that essentially any desired degree of removal of ammonia nitrogen could be accomplished by some combination of stripping pH, temperature, aeration rate, and time. A multi-variant linear regression provided an equation which summarized the effects of the four parameters. Evaluation of the removal of grease and oil indicated that gentle aeration would provide improvement over simple pH suppression. Study of biological treatment was undertaken using laboratory-scale activated sludge plants. Treatment effectiveness was over 90% reduction in BOD in early study; later, biological process upsets caused severe deterioration in treatment effectiveness. The biological process upsets appeared related in time to plant operation, especially placing gasifiers in service and out of service, as well as changing the source of coal. It appears that, at Holston and possibly other coal gasification plants, design and operation of wastewater treatment facilities should consider the possibility of upset of biological treatment processes.

• Research Organization: East Tennessee State Univ., Johnson City (USA). Dept. of Environmental Health
• OSTI ID: 5751290
• Report Number(s): PETC-0234-T3
• 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
BENCH-SCALE EXPERIMENTS
CHEMICAL COMPOSITION
COAL GASIFICATION PLANTS
DATA
DATA FORMS
EXPERIMENTAL DATA
HYDRIDES
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
INFORMATION
LIQUID WASTES
MANAGEMENT
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
OXYGEN COMPOUNDS
PROCESSING
RECYCLING
REMOVAL
TABLES
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER
WATER TREATMENT