Treatment of biomass gasification wastewaters using reverse osmosis

Petty, S.E.; Eliason, S.D.; Lægreid, Marit

doi:10.2172/6037466

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…The aqueous condensates have a wide range of concentration of organic contaminants . Although the limited amount of previous research included organic carbon concentrations of 1 to 2 percent (26,27) our study shows that some aqueous byproducts will range up to 3 to 7 percent, as in the case of the Florida gasifiers (Rocky Creek and University of Florida) . Typical downdraft condensates will be in the range of one percent with the fluidized-bed condensates less than or equal to one percent depending on operating temperature (higher temperature results in less water-soluble tar and therefore less aqueous contamination) .…”

Section: Condensate Processing As Gasification Byproduct$mentioning

confidence: 66%

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Analysis and comparison of biomass pyrolysis/gasification condensates: an interim report

Elliott¹

1985

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This report provides results of chemical and physical analysis of condensates from eleven biomass gasification and pyrolysis systems. The analyses were performed in order to provide more detailed data concerning these condensates for the different process research groups and to allow a determination of the differences in properties of the condensates as a function of reactor environment. The analyses were performed on condensate samples provided by the reactor operators and are considered representative of the operating conditions given but they are not necessarily representative of optimum operating conditions in the specific reactors.The samples were representative of the various reactor configurations being researched within the Department of Energy, -Biomass Thermochemi ca 1 Conversion program. The condensates included tar phases, aqueous phases and, in some cases, both phases depending on the output of the particular reactor system. The analyses included gross compositional analysis (elemental analysis, ash, moisture), physical characterization (pour point, viscosity, density, heat of combustion, distillation),_ specific chemical analysis (gas chromatography/mass spectrometry, infrared spectrophotometry, proton and carbon-13 nuclear magnetic resonance spectrometry) and biological activity (Ames assay).These results are from the first phase of a longer term program to determine the properties, handling requirements, and utility of the condensates recovered from biomass gasification and pyrolysis. The analytical data demonstrates the wide range of chemical composition of the organics recoven!d in the condensates and suggests a direct relationship between operating temperature and chemical composition of the condensates. A continuous pathway of thermal degradation of the tar components as a function of temperature is proposed. Variations in the chemical composition of the organic components in the tars are reflected in the physical properties of tars and phase stability in relation to water in the condensate. The biological activity appears to be limited to the tars produced at high tempera"':ures as a result of formation of polycyclic aromatic hydrocarbons in high concentrations. Future studies of the time/temperature relationship to tar composition and the effect of processing atmosphere should be undertaken. Further processing of the condensates either as wastewater treatment or upgrading of the organics to useful products is also recommended.

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Section: Condensate Processing As Gasification Byproduct$mentioning

confidence: 66%

“…Earlier researchers (26,27) have concluded that neither coagulationflocculdtion treatment nor solvent extraction is possible with these aqueous streams and neither aerobic digestion nor activated carbon treatment is practical. Only anaerobic digestion or wet air oxidation were determined to be applicable.…”

Section: Aqueous Byproduct Treatment Studiesmentioning

confidence: 99%

Analysis and comparison of biomass pyrolysis/gasification condensates: an interim report

Elliott¹

1985

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“…In the process of gasification, water and some organic chemicals condense to form a wastewater having an organic strength ~100 times that of than domestic sewage. Several laboratory scale methods for treating these high strength wastewaters have been previously investigated at the U.S. Department of Energy's Pacific Northwest Laboratory (PNL) by Wakamiya, Maxham and Petty (1979); Maxham and Bell (1980); Maxham and Wakamiya (1980); Wakamiya and Maxham (1980); Bell (1981); English (1981); and Petty, Eliason and Laegreid (1981). These methods included aerobic and anaerobic biological treatment, activated carbon adsorption, coagulation/ flocculation, reverse osmosis, solvent extraction, and wet air oxidation (WAO).…”

Section: Introductionmentioning

confidence: 99%

Treatment of biomass gasification wastewater using a combined wet air oxidation/activated sludge process

English¹,

Petty²,

Sklarew³

1983

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This report is one of a series prepared by Pacific Northwest Laboratory for the U.S. Department of Energy on treatment of biomass gasification wastewaters. Other reports have dealt with biological treatment, carbon adsorption, chemical precipitation, reverse osmosis, solvent extraction, and wet air oxidation. All the reports include results of experimental work on a laboratory scale. Wastewater used in these studies came from the experimental Synthesis Gas From Manure (SGFM) biomass gasifier at Texas Tech University.

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