氧化还原介体催化强化污染物厌氧降解研究进展

 由于厌氧生物处理技术具有产生剩余污泥少、可回收能源等优点而被广泛用于处理各种有机污染物,尤其在有毒、有害、难降解污染物的去除方面取得了良好的效果。然而,厌氧生物法的处理速率通常比较低,而氧化还原介体可通过自身不断的氧化和还原来传递电子,提高电子在氧化还原反应过程中的传递速率,从而促进污染物高效厌氧降解。醌类物质和腐殖酸是应用较多的氧化还原介体,在催化难降解污染物降解方面取得了一定效果。讨论了氧化还原介体的特点、作用机制,并总结了其对偶氮染料厌氧脱色、反硝化和多氯联苯厌氧降解的强化作用,提出了氧化还原介体未来的研究方向。

Review on catalytic effects of redox mediator in anaerobic degradation of pollutants

Anaerobic biological treatment technology has been widely used for treating various organic pollutants due to less excessive sludge and recyclable energy, especially, good performance in removal of poisonous, harmful and refractory pollutants. However, the treatment rate of anaerobic biological process is usually relatively low. Redox mediators can improve the electron transfer rate in the redox process through continuous oxidation and reduction, promoting anaerobic degradation of pollutants. Quinones and humic acids are frequently used as redox mediators, which have achieved certain effects in catalytically enhancing the degradation of refractory pollutants. The characteristics and mechanism of redox mediators are discussed in this study, and their enhancement effects on anaerobic decolorization of azo dyes, denitrification and anaerobic degradation of polychlorinated biphenyls are summarized. Moreover, the future research direction of redox media is also proposed.