PDU scale nitrification and denitrification of Great Plains Gasification Plant's stripped gas liquor
Gasification wastewater treatment at UNDERC has focused on treating wastewater to suitable quality for reuse. Reuse criteria have centered on reduction of organic compounds; the major reuse option for these wastewaters has been for cooling water. Pilot studies at UNDERC have demonstrated that significant quantities of ammonia will be stripped in a cooling tower using stripped gas liquor as makeup, requiring further reductions in ammonia concentrations prior to reuse. Moreover, reuse can be very expensive due to the cost of chemical additives, high corrosion of construction materials and other expenses. Therefore, interest has developed in treatment of these wastewaters for discharge. Nitrogen removal to low concentrations will be required for discharge of these wastewaters and may be required for most reuse options. Biological removal of nitrogen from Great Plains Gasification Plant's stripped gas liquor (SGL), through the processes of nitrification and denitrification, are the subject of this report. Over 43,000 liters (11,360 gallons) of pretreated SGL were nitrified in 3 PDU scale reactors, and 14,500 liters (3800 gallons) of this wastewater were denitrified. The kinetics of nitrification were determined by obtaining removal data simultaneously in three activated sludge reactors operating at different solids retention times. Suspended growth (activated sludge) complete-mix, stirred-tank reactors were used for this research. Process performance data for nitrification and denitrification are reported. Essentially complete removal of ammonia, at influent concentrations of greater than 500 mg/l NH/sub 3/-N, was observed, and influent nitrate-N concentrations of greater than 750 mg/l were completely denitrified. 16 refs., 25 figs., 7 tabs.
- Research Organization:
- North Dakota Univ., Grand Forks (USA). Energy Research Center
- DOE Contract Number:
- FC21-83FE60181
- OSTI ID:
- 6084853
- Report Number(s):
- DOE/FE/60181-2002; ON: DE86008840
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL GASIFICATION PLANTS
WASTE WATER
COOLING TOWERS
WATER REQUIREMENTS
CHEMICAL COMPOSITION
DENITRIFICATION
NITRIFICATION
RECYCLING
WATER TREATMENT
ACTIVATED SLUDGE PROCESS
AMMONIA
EXPERIMENTAL DATA
REMOVAL
CHEMICAL REACTIONS
DATA
HYDRIDES
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
INFORMATION
LIQUID WASTES
MANAGEMENT
MECHANICAL STRUCTURES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
OXYGEN COMPOUNDS
PROCESSING
TOWERS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
WATER
010800* - Coal
Lignite
& Peat- Waste Management
010404 - Coal
Lignite
& Peat- Gasification