Komlos John, Moon Hee Sun, Jaffé Peter R
Dep. of Civil and Environmental Engineering, Villanova Univ., Villanova, PA 19085, USA.
J Environ Qual. 2008 Oct 23;37(6):2058-62. doi: 10.2134/jeq2007.0665. Print 2008 Nov-Dec.
The biogeochemistry related to iron- and sulfate-reducing conditions influences the fate of contaminants such as petroleum hydrocarbons, trace metals, and radionuclides (i.e., uranium) released into the subsurface. An understanding of these processes is imperative to successfully predict the fate of contaminants during bioremediation scenarios. A series of flow-through sediment column experiments were performed to determine if the commencement of sulfate-reducing conditions would occur while bioavailable Fe(III) was present and to determine how the bioreduction of a contaminant (uranium) was affected by the switch from iron-dominated to sulfate-dominated reducing conditions. The results presented herein demonstrated that, under biostimulation, sulfate reduction can commence even though a significant pool of bioavailable Fe(III) is present. In addition, the rate of U(VI) reduction was not negatively affected by the commencement of sulfate-reducing conditions.
与铁还原和硫酸盐还原条件相关的生物地球化学影响着诸如石油烃、痕量金属和释放到地下的放射性核素（即铀）等污染物的归宿。了解这些过程对于成功预测生物修复情景中污染物的归宿至关重要。进行了一系列流通式沉积物柱实验，以确定在存在生物可利用的Fe(III)时是否会开始硫酸盐还原条件，并确定从以铁为主的还原条件转变为以硫酸盐为主的还原条件如何影响污染物（铀）的生物还原。本文给出的结果表明，在生物刺激下，即使存在大量生物可利用的Fe(III)，硫酸盐还原也可以开始。此外，硫酸盐还原条件的开始对U(VI)还原速率没有负面影响。
