Comparison of the activated sludge and rotating biological contactor processes for treatment of Great Plains Gasification Plant's stripped gas liquor: Final report for the period ending June 30, 1986

Technical Report · Mon Sep 01 04:00:00 EDT 1986

OSTI ID:7249027

Mayer, G G; Gallagher, J R; Shockey, R E; Moe, T A; Wentz, C A

Fixed film (rotating biological contactor, RBC) and suspended growth (activated sludge) biological treatment processes were used to treat gasification wastewater from the Great Plains Gasification Plant. This report contains the results of the study, including a comparison of the two processes. The wastewater used was a condensate from Lurgi dry-ash gasification of lignite. The condensate was pretreated at Great Plains by solvent extraction and steam stripping to reduce phenols and ammonia, respectively. This pretreated wastewater is known as stripped gas liquor (SGL). At the University of North Dakota Energy Research Center, this wastewater was treated by both methods at the process development unit (PDU) scale. The RBC was a three stage unit that was tested at four organic loadings, ranging from 0.9 to 3.4 lbs BOD/1000 ft/sup 2/-day. The activated sludge treatment was a completely mixed system with the following operating parameters: a hydraulic retention time of 1 to 4 days, solids retention times of 2 to 13.6 days, and flow rates from 170 to 1500 liters per day (45 to 405 gpd). Process performance data were obtained and the kinetics of treatment were estimated for both treatment units. This report also includes preliminary design data for the RBC and activated sludge processes at the design wastewater flow rate for the Great Plains Gasification Plant. This comparison indicates that for a single process, the activated sludge would probably be the most cost effective. However, the advantages inherent in each process can be realized using the RBC as a pretreatment and the activated sludge process as the polishing step. 22 refs., 36 figs., 17 tabs.

• Research Organization: North Dakota Univ., Grand Forks (USA). Energy and Mineral Research Center
• DOE Contract Number: FC21-83FE60181
• OSTI ID: 7249027
• Report Number(s): DOE/FE/60181-2165; ON: DE87001018
• 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
BIOREACTORS
COAL GASIFICATION PLANTS
COMPARATIVE EVALUATIONS
DATA
EXPERIMENTAL DATA
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INDUSTRIAL PLANTS
INFORMATION
LIQUID WASTES
MANAGEMENT
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHENOLS
PROCESSING
REMOVAL
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER
WATER TREATMENT