Environmental Pollution ( IF 7.6 ) Pub Date : 2019-01-18 , DOI: 10.1016/j.envpol.2019.01.066
Jinyi Ge , Shan Huang , Il Han , Peter R. Jaffé
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The degradation of trichloroethylene (TCE) and tetrachloroethylene (PCE), in incubations where ammonium was oxidized while iron was being reduced indicates that these compounds can be degraded during the Feammox process by Acidimicrobiaceae sp. A6 (ATCC, PTA-122488). None of these compounds were degraded in incubations to which no ammonium was added, indicating that they were degraded during the oxidation of ammonium. Degradation of TCE and PCE (ranging between 32% and 55%) was observed in incubations with a pure Acidimicrobiaceae sp. A6 culture as well as an Acidimicrobiaceae sp. A6 enrichment culture over a 2-week period. In addition to these batch studies, a column study, with a 5-h hydraulic residence time, was conducted contrasting the degradation of TCE in iron-rich soil columns that were either seeded with a pure or an enrichment culture of Acidimicrobiaceae sp. A6 to achieve ammonium oxidation under iron reduction, and a control column that was initially not seeded and later seeded with Geobacter metallireducens. While there was ∼22% TCE removal in the columns seeded with Acidimicrobiaceae sp. A6, there was no removal in the unseeded column or the column seeded with G. metallireducens which was being operated under iron reducing conditions. Feammox is an anoxic process that requires acidic conditions. Hence, these results indicate that this process might be harnessed where other bioremediation strategies are difficult, since many require neutral or alkaline conditions, and supplying ammonium to an anoxic aquifer is relatively easy, since there are not many processes that will oxidize ammonium in the absence of dissolved oxygen.
中文翻译:

Acidimicrobiaceae sp。在铁还原条件下降解四氯乙烯和三氯乙烯。A6
在氨被还原而铁被还原的温育条件下,三氯乙烯(TCE)和四氯乙烯(PCE)的降解表明这些化合物可以在Feammox过程中被酸性微菌科菌Acidimicrobiaceae sp降解。A6(ATCC,PTA-122488)。在不添加铵的培养中,这些化合物均未降解,表明它们在铵的氧化过程中被降解。在与纯酸性丝菌科菌种孵育时,观察到TCE和PCE的降解(介于32%和55%之间)。A6培养物以及嗜酸菌科菌(Acidimicrobiaceae sp。在2周的时间内进行A6富集培养。除了这些批处理研究外,还进行了具有5小时水力停留时间的柱研究,对比了用纯铁或酸性菌种的富铁土壤种子播种的富铁土壤柱中TCE的降解情况。A6可以在铁还原下实现铵氧化,而对照柱最初没有接种,后来注入了金属还原杆菌(Geobacter metallireducens)。而在用酸性微菌科菌种接种的柱子中,TCE的去除率约为22%。A6,有在未接种的列中没有移除或与接种列G. metallireducens它是在铁还原条件下运行的。Feammox是需要酸性条件的缺氧过程。因此,这些结果表明,在其他生物修复策略较为困难的情况下,可以利用该方法,因为许多方法需要中性或碱性条件,而向缺氧含水层中供应铵则相对容易,因为在没有这种方法的情况下,没有很多方法会氧化铵溶解氧。