粉煤灰陶粒对废水中磷酸盐的吸附试验研究  

Adsorption of phosphate from wastewater by fly ash ceramsite

作　　者：蒋丽[1,2] 谌建宇[3,4] 李小明[1,2,5] 罗隽[3,4] 杨麒[1,2] 王宇[1,2] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082 [2]湖南大学环境生物与控制教育部重点实验室,长沙410082 [3]湖南大学 [4]环境保护部华南环境科学研究所,广州510655 [5]广西大学环境学院,南宁530004

出　　处：《环境科学学报》2011年第7期1413-1420,共8页Acta Scientiae Circumstantiae

基　　金：国际科技合作项目(No.2009DFA9180);国家水专项(No.2008ZX07211-04)~~

摘　　要：以粉煤灰为主要原料制成粉煤灰陶粒,研究其对废水中磷酸盐的去除情况.同时,考察了影响粉煤灰陶粒吸附磷酸盐的主要因素及平衡吸附量,并对其进行吸附等温模型拟合分析.结果表明,粉煤灰陶粒对磷酸盐的去除率随粉煤灰陶粒投加量的增大而增加,较高的磷酸盐初始浓度可以加快磷酸盐的吸附.在较宽pH(4～10)范围内,均能呈现较好的磷酸盐去除效果,且当pH为自然值(约为6.0)时,吸附效果最佳.粉煤灰陶粒对磷酸盐的吸附是一个缓慢的吸附过程,12h内可达到吸附平衡,该吸附过程符合伪二级动力学方程.粉煤灰陶粒对磷酸盐的吸附符合Langmuir等温模型.随着温度的升高,粉煤灰陶粒的最大吸附饱和量(Qmax)逐渐减小,温度为15、25、35℃时,粉煤灰陶粒的最大吸附饱和量分别为0.7903、0.7426、0.6111mg·g-1.粉煤灰陶粒吸附磷酸盐后在一定条件下可以重新解吸出来,且随着解吸液(NaOH)浓度的增加解吸率增大.New ceramsites made from coal fly ash,a small amount of clay and other admixtures were tested and used in wastewater nutrient pollution control（phosphate removal）.We measured the factors affecting phosphate removal,the phosphate equilibrium adsorption capacity and the adsorption isotherms.The results show that the phosphate removal ratio increases with the dosage of ceramsites,and the adsorption rate is relatively fast for higher initial concentrations of phosphate.Within the range of pH from 4 to 10,the removal effects of phosphate are good and the optimum pH for adsorption is 6.0.Phosphate adsorption is a relatively slow process,and reaches equilibrium status in 12 hours.The pseudo-second-order kinetic equation is suitable for simulation of the process,and the Langmuir isotherm model fit the data well.The maximum adsorption capacity of phosphate decreases with temperature,and at 15℃,25℃ and 35℃,the maximum adsorption capacities of fly ash ceramsites were 0.7903 mg · g-1,0.7426 mg · g-1,0.6111 mg · g-1 respectively.The phosphate adsorbed by fly ash ceramsites could be desorbed,and the desorption efficiency could be enhanced by increasing the concentration of stripping liquid.

关 键 词：粉煤灰 陶粒 废水 磷酸盐 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]