Department of Civil and Environmental Engineering, University of Waterloo, 200 University Ave. W., Waterloo, Ontario N2L 3G1, Canada.
J Contam Hydrol. 2013 Jul;150:35-44. doi: 10.1016/j.jconhyd.2013.03.007. Epub 2013 Apr 15.
One pore volume of unactivated sodium persulfate was delivered into an emplaced gasoline residual source zone at CFB Borden. Concentrations of inorganic species (S2O8(2-), SO4(2-), Na(+), dissolved inorganic carbon (DIC)) and selected gasoline compounds (benzene, toluene, ethylbenzene, xylenes, trimethylbenzenes and naphthalene) were monitored across a transect equipped with 90 multilevel sampling points for >10months post-injection. Mass loading (M˙) of compounds constructed from the transect data was used for assessment purposes. Breakthrough of inorganic species was observed when the injection slug crossed the monitoring transect. An increase in [Formula: see text] indicated persulfate consumption during oxidation of gasoline compounds or degradation due to the interaction with aquifer materials. M˙DIC increased by >100% suggesting some mineralization of gasoline compounds during treatment. Mass loading for all the monitored gasoline compounds reduced by 46 to 86% as the inorganic slug crossed the monitoring transect. The cumulative mass discharge across the monitoring transect was 19 to 58% lower than that expected without persulfate injection. After the inorganic injection slug was flushed from the source zone a partial rebound (40 to 80% of baseline levels) of mass discharge of the monitored gasoline compounds was observed. The ensemble of data collected provides insight into the fate and transport of the injected persulfate solution, and the accompanying treatment of a gasoline the source zone.
在 CFB Borden，将一个孔隙体积的未活化过的过硫酸钠注入到一个已安置的汽油残留源区。在注入后超过 10 个月的时间里，在一个配备了 90 个多层次采样点的横截面上监测了无机物种（S2O8(2-), SO4(2-), Na(+), 溶解无机碳（DIC））和选定的汽油化合物（苯、甲苯、乙苯、二甲苯、三甲苯和萘）的浓度。从横截面上获得的化合物的质量负荷（M˙）用于评估目的。当注入的段塞穿过监测横截面时，观察到无机物质的突破。[Formula: see text]的增加表明在汽油化合物的氧化过程中过硫酸盐的消耗或由于与含水层材料的相互作用而导致的降解。DIC 的 M˙增加了>100%，表明在处理过程中部分汽油化合物发生了矿化。随着无机段塞穿过监测横截面，所有监测的汽油化合物的质量负荷减少了 46%至 86%。与没有过硫酸盐注入时相比，监测横截面上的累积质量排放量降低了 19%至 58%。在无机注入段塞从源区冲洗干净后，监测到汽油化合物的质量排放出现部分反弹（基线水平的 40%至 80%）。收集的整套数据提供了对注入过硫酸盐溶液的命运和运移以及伴随的汽油源区处理的深入了解。
