Desorption kinetics of polycylic aromatic hydrocarbons in coal fines and coal contaminated sediments

Shorten, C V

Title: Desorption kinetics of polycylic aromatic hydrocarbons in coal fines and coal contaminated sediments

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Abstract

Batch with fluid replacement (BFR) and time resolved leaching (TRL) methods were developed to determine the desorption kinetics of polycyclic aromatic hydrocarbons (PAHs) in coal fines and coal contaminated sediments using various organic solvent/water mixtures. The two techniques were relatively comparable, with a given solvent, solid phase, and experimental time scale. TRL is the method of choice for short term (one day or less) experiments while BFR is better suited for long term desorption studies. Both phenanthrene and chrysene desorbed from coal contaminated sediments following first order kinetics. Predicted equilibrium concentrations ((C){sub eq}) and desorption rate constants (k{sub d}) were estimated using both one and two stage first order kinetic models. Acetone/water solvent mixtures induced desorption of greater amounts of phenanthrene than did more highly polar methanol/water mixtures, and desorption rate coefficients were higher in the acetone mixtures than they were in the methanol mixtures. As predicted by cosolvent theory and microscopic equilibrium, k{sub d} values increased (slightly) with increasing mole fraction cosolvent and (C){sub eq} values also increased (significantly) with increasing mole fraction cosolvent. Experimental design and period of observation of the desorption process appeared to be important in the consideration of observed desorption constants. Solids concentration in themore »« less

Authors:: Shorten, C V

Publication Date:: Sun Jan 01 00:00:00 EST 1989

Research Org.:: Clemson Univ., SC (USA)

OSTI Identifier:: 6677534

Resource Type:: Miscellaneous

Resource Relation:: Other Information: Thesis (Ph. D.)

Country of Publication:: United States

Language:: English

Subject:: 01 COAL, LIGNITE, AND PEAT; 54 ENVIRONMENTAL SCIENCES; COAL FINES; SORPTIVE PROPERTIES; POLYCYCLIC AROMATIC HYDROCARBONS; DESORPTION; SEDIMENTS; ACETONE; CHEMICAL REACTION KINETICS; CHRYSENE; EQUILIBRIUM; KINETIC EQUATIONS; LEACHING; MATHEMATICAL MODELS; MEASURING METHODS; METHANOL; ORGANIC SOLVENTS; PHENANTHRENE; QUANTITY RATIO; TIME DEPENDENCE; WATER; ALCOHOLS; AROMATICS; CONDENSED AROMATICS; DISSOLUTION; EQUATIONS; HYDROCARBONS; HYDROGEN COMPOUNDS; HYDROXY COMPOUNDS; KETONES; KINETICS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; REACTION KINETICS; SEPARATION PROCESSES; SOLVENTS; SURFACE PROPERTIES; 010900* - Coal, Lignite, & Peat- Environmental Aspects; 540220 - Environment, Terrestrial- Chemicals Monitoring & Transport- (1990-)

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                    Shorten, C V. Desorption kinetics of polycylic aromatic hydrocarbons in coal fines and coal contaminated sediments.  United States: N. p., 1989. 
        Web.

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                    Shorten, C V. Desorption kinetics of polycylic aromatic hydrocarbons in coal fines and coal contaminated sediments.  United States.

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                    Shorten, C V. 1989.  
        "Desorption kinetics of polycylic aromatic hydrocarbons in coal fines and coal contaminated sediments".  United States.

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@article{osti_6677534,

  title        = {Desorption kinetics of polycylic aromatic hydrocarbons in coal fines and coal contaminated sediments},

  author       = {Shorten, C V},

  abstractNote = {Batch with fluid replacement (BFR) and time resolved leaching (TRL) methods were developed to determine the desorption kinetics of polycyclic aromatic hydrocarbons (PAHs) in coal fines and coal contaminated sediments using various organic solvent/water mixtures. The two techniques were relatively comparable, with a given solvent, solid phase, and experimental time scale. TRL is the method of choice for short term (one day or less) experiments while BFR is better suited for long term desorption studies. Both phenanthrene and chrysene desorbed from coal contaminated sediments following first order kinetics. Predicted equilibrium concentrations ((C){sub eq}) and desorption rate constants (k{sub d}) were estimated using both one and two stage first order kinetic models. Acetone/water solvent mixtures induced desorption of greater amounts of phenanthrene than did more highly polar methanol/water mixtures, and desorption rate coefficients were higher in the acetone mixtures than they were in the methanol mixtures. As predicted by cosolvent theory and microscopic equilibrium, k{sub d} values increased (slightly) with increasing mole fraction cosolvent and (C){sub eq} values also increased (significantly) with increasing mole fraction cosolvent. Experimental design and period of observation of the desorption process appeared to be important in the consideration of observed desorption constants. Solids concentration in the BFR reactors was varied from 1000 to 100,000 mg/l. Total mas of both compounds released to the liquid phase increased significantly with increasing suspended solids concentrations, but relationship between rate constants and solids concentration were more complex.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/6677534},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sun Jan 01 00:00:00 EST 1989},

  month        = {Sun Jan 01 00:00:00 EST 1989}

}

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