División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica (IPICyT), Camino a la Presa San José 2055, Col. Lomas 4ª. Sección, San Luis Potosí, SLP 78216, Mexico.
Bioresour Technol. 2011 Jan;102(2):2097-100. doi: 10.1016/j.biortech.2010.08.021. Epub 2010 Aug 11.
A novel technique to immobilize humic substances (HS) on an anion exchange resin is presented. Immobilized HS were demonstrated as an effective solid-phase redox mediator (RM) during the reductive biotransformation of carbon tetrachloride (CT) and the azo model compound, Reactive Red 2 (RR2). Immobilized HS increased ∼4-fold the extent of CT reduction to chloroform by a humus-reducing consortium in comparison to incubations lacking HS. Immobilized HS also increased 2-fold the second-order rate constant of decolorization of RR2 as compared with sludge incubations lacking HS. To our knowledge, the present study constitutes the first demonstration of immobilized HS serving as an effective solid-phase RM during the reductive biotransformation of priority contaminants. The immobilizing technique developed could be appropriate for enhancing the redox biotransformation of recalcitrant pollutants in anaerobic wastewater treatment systems.
提出了一种将腐殖质（HS）固定在阴离子交换树脂上的新方法。固定化 HS 被证明是一种有效的固相氧化还原介体（RM），可在四氯化碳（CT）和偶氮模型化合物活性红 2（RR2）的还原生物转化过程中发挥作用。与不添加 HS 的孵育相比，腐殖质还原菌群落使 CT 还原为三氯甲烷的程度增加了约 4 倍。与不添加 HS 的污泥孵育相比，固定化 HS 还使 RR2 的二级脱色反应速率常数增加了 2 倍。据我们所知，本研究首次证明了固定化 HS 可作为一种有效的固相 RM，在优先污染物的还原生物转化过程中发挥作用。所开发的固定化技术可能适用于增强厌氧废水处理系统中难降解污染物的氧化还原生物转化。
