Sahl Jason W, Munakata-Marr Junko, Crimi Michelle L, Siegrist Robert L
Colorado School of Mines/ESE division, Golden, CO 80401, USA.
Water Environ Res. 2007 Jan;79(1):5-12. doi: 10.2175/106143006x136720.
For sites contaminated with chloroethene non-aqueous-phase liquids, designing a remediation system that couples in situ chemical oxidation (ISCO) with potassium permanganate (KMnO4) and microbial dechlorination may be complicated because of the potentially adverse effects of ISCO on anaerobic bioremediation processes. Therefore, one-dimensional column studies were conducted to understand the effect of permanganate oxidation on tetrachloroethene (PCE) dechlorination by the anaerobic mixed culture KB-1. Following the confirmation of PCE dechlorination, KMnO4 was applied to all columns at a range of concentrations and application velocities to simulate varied distances from oxidant injection. Immediately following oxidation, reductive dechlorination was inhibited; however, after passing several pore volumes of sterile growth medium through the columns after oxidation, a rebound of PCE dechlorination activity was observed in every inoculated column without the need to reinoculate. The volume of medium required for a rebound of dechlorination activity differed from 1.1 to 8.1 pore volumes (at a groundwater velocity of 4 cm/d), depending on the specific condition of oxidant application.
对于受氯乙烯非水相液体污染的场地，设计一种将原位化学氧化（ISCO）与高锰酸钾（KMnO₄）和微生物脱氯相结合的修复系统可能会很复杂，因为ISCO可能会对厌氧生物修复过程产生潜在的不利影响。因此，进行了一维柱实验，以了解高锰酸盐氧化对厌氧混合培养物KB-1脱氯四氯乙烯（PCE）的影响。在确认PCE脱氯后，以一系列浓度和施加速度向所有柱中施加KMnO₄，以模拟距氧化剂注入点的不同距离。氧化后立即抑制了还原脱氯；然而，在氧化后使无菌生长培养基通过柱子几个孔隙体积后，在每个接种柱中都观察到PCE脱氯活性的反弹，而无需重新接种。脱氯活性反弹所需的培养基体积在1.1至8.1个孔隙体积之间（在地下水速度为4厘米/天的情况下），具体取决于氧化剂施加的特定条件。
