一种污泥基陶粒的表面改性及其在含Cr(Ⅵ)废水生物净化中的应用  

Surface modification of a sludge-based ceramsite and its application in biotreatment of wastewater containing Cr(Ⅵ)

作　　者：孙浩[1] 许燕滨[1] 陈锦棠[1] 屈毛毛[1] 陈锦良[1] 高武龙 王奎 蔡晓佳[1] 温成烨 林志宏[1] 杜青平[1] 

机构地区：[1]广东工业大学环境科学与工程学院,广州510006 [2]中山市环境保护技术中心,中山528437 [3]中山市中能环保技术有限公司,中山528459

出　　处：《环境工程学报》2016年第7期3937-3942,共6页Chinese Journal of Environmental Engineering

基　　金：广东省科技计划项目(2013B090200016);中山市科技计划项目(2013A3FC0243);大学生创新创业训练计划(201411845149)

摘　　要：为提高污泥基多孔悬浮陶粒的表面特性,增加陶粒的生物载体性能,以FeCl_3和Fe_3O_4对陶粒表面进行磁/正电改性,筛选最佳改性条件,分析改性陶粒表面特性,研究生物负载陶粒的除Cr(Ⅵ)能力。结果表明,在FeCl_3浓度1.0 mol·L^(-1),磁粉添加量10%(占FeCl_3质量分数),活化温度为600℃,活化时间为3 h条件下,改性效果最佳。通过XRD表征分析,其结果表明,改性陶粒表面附着一层多孔结构的铁氧层,主要晶相为α-Fe_2O_3和Fe_3O_4。改性陶粒作为生物载体,在pH为4.0,Cr(Ⅵ)浓度为50 mg·L^(-1)的模拟废水中处理8 d,其去除效果可达97.9%,为未改性陶粒的1.9倍。研究结果对推动含Cr(Ⅵ)废水生物处理具有指导意义。To improve the surface properties and biological carrying ability of sludge-based porous suspended ceramsite,FeCl_3 and Fe_3O_4were used to modify the magnetic / positive charge property of the ceramsite surface. In the present study,we explored the optimal conditions for modification,analyzed the surface characteristics of the modified ceramsite and investigated the application in the biological purification of Cr（ Ⅵ）-containing wastewater of biological loading ceramsite. The results showed that the optimal modification was achieved by1. 0 mol·L^（-1）of FeCl_3,10% of magnetic powder（ mass ratio to FeCl_3） with activation for 3 h at 600 ℃. The XRD characterization analysis indicated that a porous iron oxide layer,whose main crystal phases were α-Fe_3O_4 and Fe_3O_4,was adhered to the surface of modified ceramsite. As a biological carrier,modified ceramsite was capable to remove 97. 9% of Cr（ Ⅵ） at pH 4. 0 after 8 days from synthetic wastewater with initial Cr（ Ⅵ） concentration of 50 mg·L^（-1）,and the Cr（ Ⅵ） removal efficiency was as high as 1. 9 folds of the unmodified ceramsites＇. These results will significantly contribute to the biological treatement of wastewater bearing Cr（ Ⅵ）.

关 键 词：陶粒 磁/正电改性 生物载体 含Cr(Ⅵ) 

分 类 号：X703[环境科学与工程—环境工程]