EC/CoFe_(2)O_(4)/HAP催化过一硫酸盐处理老龄垃圾渗滤液

EC/CoFe_(2)O_(4)/HAP Catalytic Peroxymonosulfate Treatment of Aged Landfill Leachate

为解决老龄垃圾渗滤液难降解的问题,制备了羟基磷灰石负载铁酸钴(CoFe_(2)O_(4)/HAP)作为催化剂,与电化学(EC)联用催化过一硫酸盐(PMS)处理老龄垃圾渗滤液。采用X射线衍射(XRD)、扫描电镜(SEM)和X射线电子能谱分析(XPS)对材料进行表征,并研究不同的实验条件对处理效果的影响。实验结果显示,在溶液pH为7、PMS浓度为2.0 mmoL/L,CoFe_(2)O_(4)/HAP浓度为1.0 g/L,电流密度为15 mA/cm^(2),反应2 h的条件下化学需氧量(COD)和UV_(254)的去除效果最好,分别为69.37%和81.28%。气相色谱-质谱联用(GC-MS)和三维荧光光谱(3D-EEM)对进出水的分析结果表明,经过处理后渗滤液中大部分硅氧烷被降解掉,大分子物质逐步分解成小分子物质,烷烃衍生物含量增加,类腐殖酸以及苯环类等物质有所减少,因此,可以看出EC/CoFe_(2)O_(4)/HAP催化PMS处理垃圾渗滤液有着较好的处理效果。

In order to solve the problem that the aged landfill leachate is difficult to degrade,hydroxyapatite supported cobalt ferrite(CoFe_(2)O_(4)/HAP)was prepared as catalyst,and was combined with Electrochemistry(EC)to catalyze peroxymonosulfate(PMS)treatment of aged landfill leachate.Xray diffraction(XRD),scanning electron microscopy(SEM)and X-ray energy dispersive spectroscopy(XPS)were used to characterize the materials.The results showed that under the experimental conditions of pH 7,PMS concentration of 2.0 mmoL/L,CoFe_(2)O_(4)/HAP concentration of 1.0 g/L,current density of 15 mA/cm^(2),and reaction time of 2 h,the removal efficiency of COD and UV_(254) was 69.37%and 81.28%,respectively.The analysis results of GC-MS and 3D-EEM showed that most of the siloxanes in the leachate were degraded,the macromolecules were gradually decomposed into small molecules,the content of alkane derivatives increased,and the humic acid and benzene ring like substances decreased.Therefore,it can be seen that EC/CoFe_(2)O_(4)/HAP catalytic PMS treatment of landfill leachate has a good treatment effect.