PAH degradation and redox control in an electrode enhanced sediment cap.
PAH degradation and redox control in an electrode enhanced sediment cap.
复制标题
DOI：
10.1002/jctb.3767
复制
发表时间：
2012-09
影响因子：
3.4
通讯作者：
Reible, Danny D.
中科院分区：
文献类型：
--
作者：
Yan, Fei;Reible, Danny D.
关键词：
封盖通常用于控制污染物从底层沉积物中释放出来。然而，传统沉积物盖的存在往往会消除或减缓表面沉积物可能发生的自然退化。本研究的目的是探索一种新型活性封盖的潜力，一种用于修复多环芳烃污染沉积物的电极增强封盖。电极强化生物降解浆料中多环芳烃的研究表明，在4 d内，电生物反应器中萘浓度从~1000 μg/L降至~50 μg/L，菲浓度从~150 μg/L降至~30 μg/L，多环芳烃降解基因拷贝数增加了近2个数量级。在帽微观世界中，两个碳电极被放置在沉积物帽内，外加电位为2v。阳极被放置在沉积物-帽界面促进氧化条件。氧化还原电位（ORP）曲线显示，施加电压后，沉积物-盖层界面处的氧化还原电位比控制组高约60-100 mV。通过pdms包覆纤维获得了孔水中菲浓度的垂直分布曲线，结果表明，在10周内，在阳极下方0 ~ 0.5 cm深度处的菲被降解至初始浓度的70%左右。在相同深度，多环芳烃降解基因增加了约1个数量级。无电源组无多环芳烃降解。这些发现表明，电极增强封盖可用于控制氧化还原电位，提供微生物电子受体，并刺激多环芳烃的降解。
Capping is typically used to control contaminant release from the underlying sediments. However, the presence of conventional sediment caps will often eliminate or slow natural degradation that might otherwise occur at the surface sediment. The objective of this study was to explore the potential of a novel reactive capping, an electrode enhanced cap for the remediation of PAH contaminated sediment. The study on electrode enhanced biodegradation of PAH in slurries showed that naphthalene concentration decreased from ~1000 μg/L to ~50 μg/L, and phenanthrene decreased from ~150 μg/L to ~30 μg/L in ElectroBioReactor within 4 days, and the copy numbers of PAH degrading genes increased by almost 2 orders of magnitude. In a cap microcosm, two carbon electrodes were emplaced within a sediment cap with an applied potential of 2 V. The anode was placed at the sediment-cap interface encouraging oxidizing conditions. Oxidation and Reduction Potential (ORP) profiles showed redox potential approximately 60-100 mV higher at the sediment-cap interface with the application of voltage than in controls. Vertical profiles of phenanthrene porewater concentration were obtained by PDMS-coated fiber, and results showed that phenanthrene at the depth of 0-0.5 cm below the anode was degraded to ~70% of the initial concentration within 10 weeks. PAH degrading genes showed an increase of approximately 1 order of magnitude at the same depth. The no power controls showed no degradation of PAH. These findings suggest that electrode enhanced capping can be used to control redox potential, provide microbial electron acceptor, and stimulate PAH degradation.
登录
查看更多内容
影响因子：
11.4
作者：
Gent, David B.;Wani, Altaf H.;Alshawabkah, Akram
通讯作者：
Alshawabkah, Akram
影响因子：
4.1
作者：
Lu, Xiaoxia;Skwarski, Alison;Reible, Danny D.
通讯作者：
Reible, Danny D.
影响因子：
2
作者：
Reible, D;Hayes, D;Teal, J
通讯作者：
Teal, J
影响因子：
13.6
作者：
ACAR, YB;GALE, RJ;PARKER, R
通讯作者：
PARKER, R
影响因子：
11.4
作者：
ACAR, YB;ALSHAWABKEH, AN
通讯作者：
ALSHAWABKEH, AN