Treatment of biomass gasification wastewaters using liquid-liquid extraction
Pacific Northwest Laboratory (PNL) investigated liquid-liquid extraction as a treatment method for biomass gasification wastewaters (BGW). Distribution coefficients for chemical oxygen demand (COD) removal were determined for the following solvents: methylisobutyl ketone (MIBK), n-butyl acetate, n-butanol, MIBK/n-butyl acetate (50:50 vol), MIBK/n-butanol (50:50 vol), tri-butyl phosphate, tri-n-octyl phosphine oxide (TOPO)/MIBK (10:90 wt), TOPO/kerosene (10:90 wt), kerosene, and toluene. The best distribution coefficient of 1.3 was given by n-butanol. Chemical analysis of the wastewater by gas chromatography (GC) showed acetic acid and propionic acid concentrations of about 4000 mg/1. Methanol, ethanol, and acetone were identified in trace amounts. These five compounds accounted for 45% of the measured COD of 29,000 mg/1. Because of the presence of carboxylic acids, pH was expected to affect extraction of the wastewater. At low pH the acids should be in the acidic form, which increased extraction by MIBK. Extraction by n-butanol was increased at high pH, where the acids should be in the ionic form.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6228543
- Report Number(s):
- PNL-4016; ON: DE82000711
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
09 BIOMASS FUELS
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
BIOMASS
GASIFICATION
BIOMASS CONVERSION PLANTS
WASTE PROCESSING
MANURES
WASTE WATER
CHEMICAL ANALYSIS
ACETIC ACID
ACETONE
BUTANOLS
CARBOXYLIC ACIDS
CHEMICAL OXYGEN DEMAND
ETHANOL
EXPERIMENTAL DATA
GAS CHROMATOGRAPHY
METHANOL
PH VALUE
PROPIONIC ACID
QUANTITY RATIO
REMOVAL
SOLVENT EXTRACTION
AGRICULTURAL WASTES
ALCOHOLS
CHROMATOGRAPHY
DATA
ENERGY SOURCES
EXTRACTION
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
KETONES
LIQUID WASTES
MANAGEMENT
MONOCARBOXYLIC ACIDS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC WASTES
OXYGEN COMPOUNDS
PROCESSING
RENEWABLE ENERGY SOURCES
SEPARATION PROCESSES
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
WASTES
WATER
520200* - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)
140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management