US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Robert S. Kerr Environmental Research Center, PO Box 1198, Ada, OK 74820, United States.
J Hazard Mater. 2011 Sep 15;192(3):1484-90. doi: 10.1016/j.jhazmat.2011.06.070. Epub 2011 Jul 1.
Activated persulfate (Na(2)S(2)O(8)) regeneration of methyl tert-butyl ether (MTBE) and chloroform-spent GAC was evaluated in this study. Thermal-activation of persulfate was effective and resulted in greater MTBE removal than either alkaline-activation or H(2)O(2)-persulfate binary mixtures. H(2)O(2) may serve multiple roles in oxidation mechanisms including Fenton-driven oxidation, and indirect activation of persulfate through thermal or ferrous iron activation mechanisms. More frequent, lower volume applications of persulfate solution (i.e., the persulfate loading rate), higher solid/solution ratio (g GAC mL(-1) solution), and higher persulfate concentration (mass loading) resulted in greater MTBE oxidation and removal. Chloroform oxidation was more effective in URV GAC compared to F400 GAC. This study provides baseline conditions that can be used to optimize pilot-scale persulfate-driven regeneration of contaminant-spent GAC.
本研究评估了过硫酸盐（Na2S2O8）在激活状态下对甲基叔丁基醚（MTBE）和氯仿耗尽的颗粒活性炭（GAC）的再生作用。过硫酸盐的热激活是有效的，其对 MTBE 的去除效果优于碱性激活或 H2O2-过硫酸盐二元混合物。H2O2在氧化机制中可能发挥多种作用，包括芬顿驱动氧化和通过热或二价铁激活机制间接激活过硫酸盐。过硫酸盐溶液的更频繁、更小体积的应用（即过硫酸盐的加载率）、更高的固/液比（g GAC mL-1溶液）和更高的过硫酸盐浓度（质量加载）导致 MTBE 的氧化和去除效果更好。与 F400 GAC 相比，URV GAC 对氯仿的氧化更为有效。本研究提供了基准条件，可以用来优化用于污染物耗尽的颗粒活性炭的过硫酸盐驱动的再生的中试规模。
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