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.
Appl Microbiol Biotechnol. 2013 Nov;97(22):9897-905. doi: 10.1007/s00253-013-5190-5. Epub 2013 Sep 7.
The present study reports a novel treatment concept combining the redox-mediating capacity of immobilized humic substances with the biodegrading activity of anaerobic sludge for the simultaneous removal of two representative pollutants of textile wastewaters (e.g., phenol and Reactive Red 2 (RR2)) in a high-rate anaerobic reactor. The use of immobilized humic substances (1 g total organic carbon (TOC) L(-1), supported on an anion exchange resin) in an upflow anaerobic sludge blanket (UASB) reactor increased the decolorization efficiency of RR2 (90 %), extent of phenol oxidation (75 %), and stability as compared to a control UASB reactor operated without immobilized humic substances, which collapsed after 120 days of dye introduction (50-100 mg L(-1)). Increase in the concentration of immobilized humic substances (2 g TOC L(-1)) further enhanced the stability and efficiency of the UASB reactor. Detection of aniline in the effluent as RR2 reduction product confirmed that reduction of RR2 was the major mechanism of dye removal. This is the first demonstration of immobilized humic substances serving as effective redox mediators for the removal of recalcitrant pollutants from wastewater in a high-rate anaerobic bioreactor. The novel treatment concept could also be applicable to remove a wide variety of contaminants susceptible to redox conversion, which are commonly found in different industrial sectors.
本研究报告了一种新颖的处理概念，即将固定化腐殖质的氧化还原调节能力与厌氧污泥的生物降解活性相结合，用于在高负荷厌氧反应器中同时去除两种代表性的纺织废水污染物（如苯酚和活性红 2（RR2））。在升流式厌氧污泥床（UASB）反应器中使用固定化腐殖质（1 g 总有机碳（TOC）/L（-1），负载在阴离子交换树脂上）可提高 RR2 的脱色效率（90%）、苯酚氧化程度（75%），并且与未使用固定化腐殖质的对照 UASB 反应器相比更为稳定，后者在引入染料 120 天后（50-100 mg/L）崩溃。增加固定化腐殖质的浓度（2 g TOC/L（-1））可进一步提高 UASB 反应器的稳定性和效率。在废水处理中，将固定化腐殖质作为高效氧化还原介体去除难降解污染物的概念，这在高负荷厌氧生物反应器中尚属首次。该新型处理概念也可适用于去除各种易发生氧化还原转化的污染物，这些污染物在不同工业领域中普遍存在。
