硅藻土负载纳米Fe3O4催化臭氧处理渗滤液膜滤浓缩液混沉出水

以垃圾渗滤液膜滤浓缩液混沉出水为研究对象,制备硅藻土负载纳米Fe₃O₄作为催化剂催化臭氧处理浓缩液.考察溶液初始pH值、臭氧体积流量和催化剂投加量对处理效率的影响.结果表明:在溶液初始pH值为7,臭氧体积流量为1.0 L·min^-1,催化剂投加量为0.8 g·L^-1,反应时间为90 min时,化学需氧量(COD)和UV₂₅₄去除率分别为67.8%和86.3%.对进出水进行三维荧光光谱(3D-EEM)和气相色谱-质谱联用(GC-MS)分析的结果表明:经催化臭氧氧化处理以后,浓缩液中的腐殖酸、富里酸和色氨酸等难降解物质大幅度减少;烷烃类、酚类和杂环类物质质量分数下降,烷烃类衍生物质量分数上升;硅藻土负载纳米Fe₃O₄催化臭氧对于浓缩液有着较好的处理效果.

Nano-Fe3O4/Diatomite Catalytic Ozone Treatment of Leachate Membrane Filtration Concentrate

The effluent from the landfill leachate membrane filtration concentrate was used as the research object, and the diatomite-loaded nano-Fe₃O₄ was prepared as a catalyst to catalyze the ozone treatment concentrate. The effects of initial pH of solution, volumetric flow rate of ozone, and dosage of catalyst on treatment efficiency were investigated. The results showed that when the initial pH of the solution was 7, the volumetric flow rate of ozone was 1.0 L·min^-1, the dosage of catalyst was 0.8 g·L^-1, and the reaction time was 90 min,the chemical oxygen demand(COD)and UV₂₅₄ removal rates were 67.8% and 86.3%, respectively. 3D-EEM and GC-MS analyses of the influent and effluent water showed that after the catalytic ozonation treatment, the refractory substances such as humic acid, fulvic acid and tryptophan in the concentrate were greatly reduced; the mass fraction of alkanes, phenols and heterocyclics decreased, while alkane deravatives increased. It is indicated that the diatomite-loaded nano-Fe₃O₄ catalyzed ozone has a good treatment effect on the concentrate.