Department of Civil & Environmental Engineering, Worcester Polytechnic Institute, Worcester, MA 01609, USA.
J Hazard Mater. 2010 Jun 15;178(1-3):363-9. doi: 10.1016/j.jhazmat.2010.01.088. Epub 2010 Jan 25.
Methyl tertiary butyl ether (MTBE) has been shown to be readily removed from water with powdered zeolites, but the passage of water through fixed-beds of very small powdered zeolites produces high friction losses not encountered in flow through larger sized granular materials. In this study, equilibrium and kinetic adsorption of MTBE onto granular zeolites, a coconut shell granular activated carbon (CS-1240), and a commercial carbon adsorbent (CCA) sample was evaluated. In addition, the effect of natural organic matter (NOM) on MTBE adsorption was evaluated. Batch adsorption experiments determined that ZSM-5 was the most effective granular zeolite for MTBE adsorption. Further equilibrium and kinetic experiments verified that granular ZSM-5 is superior to CS-1240 and CCA in removing MTBE from water. No competitive adsorption effects between NOM and MTBE were observed for adsorption to granular ZSM-5 or CS-1240, however there was competition between NOM and MTBE for adsorption onto the CCA granules. Fixed-bed adsorption experiments for longer run times were performed using granular ZSM-5. The bed depth service time model (BDST) was used to analyze the breakthrough data.
甲基叔丁基醚（MTBE）已被证明可通过粉末沸石从水中轻易去除，但水在通过非常小的粉末沸石固定床时会产生高摩擦损失，而在通过较大粒径的颗粒材料时不会遇到这种损失。在这项研究中，评估了 MTBE 对颗粒沸石、椰子壳颗粒活性炭（CS-1240）和商业碳吸附剂（CCA）样品的平衡和动力学吸附。此外，还评估了天然有机物（NOM）对 MTBE 吸附的影响。批量吸附实验确定 ZSM-5 是 MTBE 吸附的最有效颗粒沸石。进一步的平衡和动力学实验证实，与 CS-1240 和 CCA 相比，颗粒 ZSM-5 更能有效地从水中去除 MTBE。对于吸附到颗粒 ZSM-5 或 CS-1240 上，未观察到 NOM 和 MTBE 之间的竞争吸附效应，但对于吸附到 CCA 颗粒上，NOM 和 MTBE 之间存在竞争。使用颗粒 ZSM-5 进行了更长运行时间的固定床吸附实验。使用床层深度时间模型（BDST）分析了穿透数据。
