Biological treatability of gasifier wastewater

Technical Report · Fri Jun 01 04:00:00 EDT 1979

OSTI ID:6019208

Slack, W A

Condensate from four producer runs was successfully treated by biooxidation after pre-stripping for ammonia reduction. Assuming only simple phenols in the waste, about 43% of the condensate COD was due to phenol equivalent COD. Pre-stripping with lime rather than caustic resulted in somewhat better organic removals and improved setting of the sludge making lime the stripping agent of choice. Phenol and BOD removals were over 99% and 93% respectively even at detention times as low as 0.58 days. Solids residence times of from 4.4 to 18 days were used. Foaming problems during all biological runs required the addition of small amounts of an antifoam agent. Addition of powdered activated carbon (PAC) at a level of 3000 mg/1 in the aerator allowed the biomass to function even under stressed conditions at relatively high ammonia levels. Biological and bio-PAC runs were made using full-strength stripped condensate under non-stressed conditions. Based on the results of this investigation, biological treatment of the condensate would best be accomplished at dilutions of 1:1 to 1:2. Hydraulic residence times should be 24 to 36 hours while solids residence times of 7 to 10 days appear adequate. It should be possible to achieve TOC and COD reductions of around 80%, while removal of BOD and phenol would be over 95 and 99% respectively. (LTN)

• Research Organization: West Virginia Univ., Morgantown (USA). Dept. of Civil Engineering
• OSTI ID: 6019208
• Report Number(s): METC/CR-79/24
• 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
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACTIVATED CARBON
ACTIVATED SLUDGE PROCESS
ADSORBENTS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AMMONIA
AROMATICS
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CARBON
COAL GASIFICATION PLANTS
COLLOIDS
DILUTION
DISPERSIONS
ELEMENTS
FOAMS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
INDUSTRIAL PLANTS
LIQUID WASTES
MANAGEMENT
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHENOL
PHENOLS
PROCESSING
REMOVAL
SODIUM COMPOUNDS
SODIUM HYDROXIDES
TIME DEPENDENCE
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER
WATER TREATMENT