污泥生物炭催化高级氧化过程进展

Progress of advanced oxidation process catalyzed by sludge biochar

作为废水处理过程的副产物,污泥的高效处理处置是环保领域的难题之一。通过高温热解将污泥转化为生物炭是一种有效的污泥资源化途径。污泥生物炭不仅可作为“吸附剂”吸附去除水体中污染物,还可作为新型“催化剂”高效催化高级氧化过程以降解水体中的有机污染物。本文综述了近些年来国内外关于污泥生物炭在高级氧化技术领域尤其是催化过硫酸盐(PS)、过氧化氢(H_(2)O_(2))、臭氧(O_(3))以及光催化等氧化过程降解有机污染物的研究进展。通过探讨污泥生物炭的表面官能团、掺杂改性杂原子、负载过渡金属及其氧化物以及与其他技术耦合催化降解有机污染物的研究现状,进一步揭示污泥生物炭催化作用的关键活性位点以及催化机理。最后提出该领域目前面临的主要问题及未来发展方向,为污泥生物炭进一步实现高附加值资源化利用提供重要参考。

As a by-product of the wastewater treatment process,the efficient treatment and disposal of activated sludge are one of the difficult problems in the field of environmental protection.The conversion of activated sludge into biochar through high-temperature pyrolysis is an effective way.Sludge biochar can be used as an adsorbent to remove pollutants,meanwhile,it is a novel catalyst,which can efficiently catalyze advanced oxidation process to degrade organic pollutants in water.In this paper,the research progress on the degradation of organic pollutants by sludge biochar in the field of advanced oxidation technology was reviewed,especially in the catalytic process of persulfate(PS),hydrogen peroxide(H_(2)O_(2)),ozone(O_(3)),and photocatalysis.The key active sites and catalytic mechanisms of sludge biochar were revealed by the discussion of the surface functional groups,doping modified heteroatoms,loading transition metals and their oxides,and coupling with other technologies for the degradation of organic pollutants.Finally,the main problems and future development direction in this field are put forward,which provides an important reference for further realizing high value added resource utilization of sludge biochar.