Villatoro-Monzón W R, Mesta-Howard A M, Razo-Flores E
Instituto Mexicano del Petróleo, Programa de Biotecnología, Eje Central Lázaro Cárdenas 152, C.P. 07730, México DF.
Water Sci Technol. 2003;48(6):125-31.
Anaerobic BTEX biodegradation was tested in batch experiments using an anaerobic sediment as inoculum under Fe(III) and Mn(IV) reducing conditions. All BTEX were degraded under the conditions tested, specially under Mn(IV) reducing conditions, where benzene was degraded at a rate of 0.8 micromol l(-1) d(-1), significantly much faster than Fe(III) reducing conditions. Under Fe(III) reducing conditions, ethylbenzene was the compound that degraded at the faster rate of 0.19 micromol l(-1) d(-1). Mn(IV) reducing conditions are energetically more favourable than Fe(III), therefore, BTEX were more rapidly degraded under Mn(IV) reducing conditions. These results represent the first report of the degradation of benzene with Mn(IV) as the final electron acceptor. Amorphous manganese oxide is a natural widely distributed metal in groundwater, where it can be microbiologically reduced, leading to the degradation of monoaromatic compounds.
在批次实验中，以厌氧沉积物作为接种物，在铁（III）和锰（IV）还原条件下测试了厌氧BTEX生物降解情况。在测试条件下，所有BTEX均被降解，特别是在锰（IV）还原条件下，苯的降解速率为0.8微摩尔/升·天，明显快于铁（III）还原条件。在铁（III）还原条件下，乙苯是降解速率较快的化合物，为0.19微摩尔/升·天。锰（IV）还原条件在能量上比铁（III）更有利，因此，BTEX在锰（IV）还原条件下降解更快。这些结果代表了以锰（IV）作为最终电子受体降解苯的首次报道。无定形氧化锰是地下水中广泛分布的天然金属，在地下水中它可被微生物还原，导致单环芳烃化合物的降解。
