U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Robert S. Kerr Environmental Research Center, P.O. Box 1198, Ada, OK 74820, USA.
J Hazard Mater. 2012 Feb 29;205-206:55-62. doi: 10.1016/j.jhazmat.2011.12.003. Epub 2011 Dec 29.
Three columns containing granular activated carbon (GAC) were placed on-line at a ground water pump and treat facility, saturated with methyl tert-butyl ether (MTBE), and regenerated with hydrogen peroxide (H2O2) under different chemical, physical, and operational conditions for 3 adsorption/oxidation cycles. Supplemental iron was immobilized in the GAC (≈6 g/kg) through the amendment of a ferrous iron solution. GAC regeneration occurred under ambient thermal conditions (21-27 °C), or enhanced thermal conditions (50 °C). Semi-continuous H2O2 loading resulted in saw tooth-like H2O2 concentrations, whereas continuous H2O2 loading resulted in sustained H2O2 levels and was more time efficient. Significant removal of MTBE was measured in all three columns using $(USD) 0.6 H2O2/lb GAC. Elevated temperature played a significant role in oxidative treatment, given the lower MTBE removal at ambient temperature (62-80%) relative to MTBE removal measured under thermally enhanced (78-95%), and thermally enhanced, acid pre-treated (92-97%) conditions. Greater MTBE removal was attributed to increased intraparticle MTBE desorption and diffusion and higher aqueous MTBE concentrations. No loss in the MTBE sorption capacity of the GAC was measured, and the reaction byproducts, tert-butyl alcohol and acetone were also degraded.
三列颗粒状活性炭（GAC）在线放置在地下水泵和处理设施中，用甲基叔丁基醚（MTBE）饱和，并在不同的化学、物理和操作条件下用过氧化氢（H2O2）再生 3 次吸附/氧化循环。通过添加二价铁溶液将补充的铁固定在 GAC 中（≈6 g/kg）。GAC 再生在环境热条件（21-27°C）下或增强的热条件（50°C）下进行。半连续 H2O2 加载导致 H2O2 浓度呈锯齿状，而连续 H2O2 加载导致 H2O2 水平持续且更节省时间。在所有三个柱子中都测量到 MTBE 的显著去除，使用$(USD)0.6 H2O2/lb GAC。升高的温度在氧化处理中起着重要作用，因为在环境温度下 MTBE 的去除率较低（62-80%），而在增强的热条件下（78-95%）和增强的热条件下、酸预处理（92-97%）下测量到的 MTBE 去除率较低。MTBE 去除率的增加归因于颗粒内 MTBE 解吸和扩散的增加以及较高的水相 MTBE 浓度。未测量到 GAC 对 MTBE 的吸附容量损失，并且反应副产物叔丁醇和丙酮也被降解。
