Mass transfer characteristics of single heavy metal ions in air-sparged dialysis cells

摘要

The rate of mass transfer of three heavy metal ions such as Cu, Ni, and Zn across a regenerated cellulose membrane in a batch dialysis cell was measured by conductivity method by air-sparging. Air-spargingenhanced the rate of mass transfer depending on the air velocity. The increase in mass transfer coefficient ranged from 83.3 to 125%, 149.83 to 200%, and 99.4 to 201.52% for Cu, Ni, and Zn, respectively. The exponent values of superficial velocity agreed with the values obtained in previous studies on heat and mass transfer in bubble-stirred systems. The ranges of exponents were 0.0093 < Re Fr < 0.0467, 110,584.3 ＜ Sc ＜ 240214.9,2.11e-5 ＜ St ＜ 9.45e-5. The overall mass transfer correlation came to J = 0.027 (Re Fr)~(-0.261).