Department of Environmental Science and Engineering, Tunghai University, P.O. Box 181, Taichung 407, Taiwan.
Water Res. 2012 Jun 1;46(9):2869-80. doi: 10.1016/j.watres.2012.02.041. Epub 2012 Mar 13.
High gravity rotating packed bed (HGRPB) reactor possesses the property of high mass transfer rate, which is expected to promote the adsorption rate for the process. In this study, HGRPB has been applied on adsorption removal of methomyl from solution, adopting the adsorbent of activated carbon F400. The influence of operating parameters of HGRPB on mass transfer such as the rotating speed (N(R)), the flow rate of solution (F(L)) and initial concentration of methomyl (C(b0)) were examined. The traditionally internal mass transfer models combined with Freundlich isotherm were used to predict the surface and effective diffusion coefficients. In addition, the results have also been compared with those obtained from the traditional basket stirred batch reactor (BBR). The results showed that the larger values of N(R) and F(L) enhanced the effective intraparticle diffusion and provided more accessible adsorption sites so as to result in lower equilibrium concentration in HGRPB system when compared to SBR system. The results of adsorption kinetics demonstrated that surface and effective diffusions were both significantly greater in HGRPB system instead of BBR system. Furthermore, the values of Bi(S) also manifested less internal mass transfer resistance in HGRPB system. The contribution ratio (R(F)) of the surface to pore diffusion mass transport showed that the larger contribution resulted from the surface diffusion in HGRPB system. Therefore, the results reasonably led to the conclusion that when the HGRPB system applied on the adsorption of methomyl on F400, the lower equilibrium concentration and faster internal mass transfer can be obtained so as to highly possess great potential to match the gradually stricter environmental standard.
高重力旋转填充床（HGRPB）反应器具有传质速率高的特点，有望提高该过程的吸附速率。在这项研究中，采用活性炭 F400 作为吸附剂，将 HGRPB 应用于溶液中甲胺磷的吸附去除。考察了 HGRPB 的操作参数（转速 N(R)、溶液流量 F(L)和甲胺磷初始浓度 C(b0)）对传质的影响。采用传统的内扩散模型与 Freundlich 等温线相结合，预测了表面扩散系数和有效扩散系数。此外，还将结果与传统的篮式搅拌间歇反应器（BBR）进行了比较。结果表明，较大的 N(R)和 F(L)值增强了有效内扩散，提供了更多可及的吸附位点，从而使 HGRPB 系统的平衡浓度低于 SBR 系统。吸附动力学结果表明，HGRPB 系统中的表面扩散和有效扩散都显著大于 BBR 系统。此外，Bi(S)值也表明 HGRPB 系统内部传质阻力较小。表面到孔扩散传质的贡献比（R(F)）表明，HGRPB 系统中表面扩散的贡献更大。因此，结果合理地得出结论，当 HGRPB 系统应用于 F400 对甲胺磷的吸附时，可以获得较低的平衡浓度和更快的内部传质，从而具有很大的潜力来满足日益严格的环境标准。
