Bubble column reactors for wastewater treatment. 1: Theory and modeling of continuous countercurrent solvent sublation
- Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Chemical Engineering
Solvent sublation is a nonfoaming wastewater treatment process that combines the benefits of bubble fractionation and liquid-liquid extraction in a way that does not require mixers, settlers, or subsequent downstream treatment. A review of past work on small lab-scale batch columns revealed that removal efficiencies of nonvolatile and volatile organic compounds are generally higher than those observed in bubble fractionation, air stripping, and conventional liquid-liquid extraction. In this work, the first of a three-part series, the transport mechanisms in a three-phase continuous, countercurrent sublation process are presented. Two mathematical models, namely, the series CSTR model (SCM) and the two-phase axial dispersion model (ADM2), are developed. It is shown that these two models are equivalent and can be used interchangeably with the aid of a simple expression. Nondimensional correlations, based upon simulated data obtained from the SCM, are generated to predict the steady-state fractional removal, FR, and the separation factor, {Sigma} (ratio of effluent solvent concentration to effluent water concentration), for strongly hydrophobic compounds. The effects of operational, hydrodynamic, thermodynamic, and design variables on sublation performance are discussed.
- OSTI ID:
- 253762
- Journal Information:
- Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 5 Vol. 35; ISSN IECRED; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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