炼化污泥基催化剂协同臭氧处理难降解废水的研究

Catalytic ozonation of refractory wastewater with biochar catalyst prepared by petrochemical waste sludge

将炼化剩余活性污泥进行热解与碱处理,成功制备出可协同臭氧处理难降解废水的污泥基催化剂。在初始pH分别为5.8、7.0、10.0时处理硝基苯废水,与单独臭氧氧化相比,污泥基催化剂协同臭氧氧化处理的TOC去除率分别提高了34.1%、46.5%、27.9%。且在中性条件下的催化臭氧氧化处理过程中,与煤基活性炭相比,该污泥基催化剂能将TOC去除率提高15.7%。催化剂表面丰富的金属氧化物和含碳官能团构成复合活性中心,催化臭氧分解产生自由基。

The petrochemical remaining activated sludge was pyrolyzed and then treated by alkali to prepare biochar catalyst,which can be use to treat refractory wastewater under ozone condition. Under different initial pH values(p H=5.8,7.0 and 10.0),the TOC removal of nitrobenzene wastewater in catalytic ozonation increased by 34.1%,46.5%and 27.9%,respectively,compared with those by ozonation only. Furthermore,in the catalytic ozonation process,the sludge-based catalyst improved the TOC removal by 15.7% compared with coal-based activated carbon under neutral conditions. Rich metal oxides and carbon-containing functional groups on the catalyst surface constituted the composite active sites,which promoted the decomposition of ozone to produce free radicals.