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Now showing 1 - 3 of 3
  • Thumbnail Image
    Item type:Item,
    A refined model for ozone mass transfer in a bubble column
    (1998-01-01)
    Huang, WH
    ;
    Chang, CY
    ;
    Chiu, CY
    ;
    Lee, SJ
    ;
    Yu, YH
    The mathematical model proposed by Marinas et ai. (1993) for a bubble column gas-liquid contactor is refined to described the mass transfer of ozone absorption and decomposition in the aqueous solution with the decomposition rate expression of general reaction orders (not necessarily integers). Three system equations are employed to describe the ozone concentrations in the bulk liquid (C-ALb), the hold-up gas (C-AGb), and the superficial gas rise velocity (u(G)), respectively. The variation of u(G) and the effect of ozone decomposition on the mass transfer, which is reflected by the enhancement factor (E-r) defined as the ratio of chemical to pure physical mass fluxes according to the film model of gas liquid absorption, are considered in the refined model. This analysis thus extends the applicability of the model of Marinas et al. (1993) and is of special importance for the ozone mass transfer in the cases of basic solutions and of low mass transfer coefficients, in which the effect of decomposition on absorption is significant. An example of such case is the cyanide wastewater treatment in the strong basic condition.
  • Thumbnail Image
    Item type:Item,
    Modeling ozone mass transfer with combined effects of ozone decomposition and reaction with pollutants in a bubble column
    (2001-09-01)
    Huang, WH
    ;
    Chang, CY
    ;
    Chiu, CY
    ;
    Chen, YH
    ;
    Yu, YH
    This paper analyzes the countercurrent single-stage bubble column reactor (BCR) for gas-liquid ozonation systems. The effects of system variables on ozonation performance are examined. The aspects of ozonation performance considered include the efficiency of ozone utilization, the efficiency of pollutant removal, and the emission concentration of ozone gas. This analysis takes into account the effects of ozone decomposition and the ozonation of pollutants on the ozone mass transfer (i. e., enhancement factror, E-r), the variation of pressure (P) and of gas velocity (U-G) along the column, and dispersion effects (Pe(G), Pe(L)). The obtained detailed single-stage BCR model may be used in further development of multi-stage BCR model in the future. The results of this study can provide useful information for rational design of a BCR ozonation contactor, and are important with respect to the treatment of pollutants via ozonation. For the simplified case without ozonation of pollutants, this analysis reduces to that of Huang et al. (1998).
  • Thumbnail Image
    Item type:Item,
    A refined model for ozone mass transfer in a bubble column
    (1998-01-01)
    Huang, WH
    ;
    Chang, CY
    ;
    Chiu, CY
    ;
    Lee, SJ
    ;
    Yu, YH
    The mathematical model proposed by Marinas et ai. (1993) for a bubble column gas-liquid contactor is refined to described the mass transfer of ozone absorption and decomposition in the aqueous solution with the decomposition rate expression of general reaction orders (not necessarily integers). Three system equations are employed to describe the ozone concentrations in the bulk liquid (C-ALb), the hold-up gas (C-AGb), and the superficial gas rise velocity (u(G)), respectively. The variation of u(G) and the effect of ozone decomposition on the mass transfer, which is reflected by the enhancement factor (E-r) defined as the ratio of chemical to pure physical mass fluxes according to the film model of gas liquid absorption, are considered in the refined model. This analysis thus extends the applicability of the model of Marinas et al. (1993) and is of special importance for the ozone mass transfer in the cases of basic solutions and of low mass transfer coefficients, in which the effect of decomposition on absorption is significant. An example of such case is the cyanide wastewater treatment in the strong basic condition.