Simultaneous removal of ammonium and phosphate from aqueous solution by calcium chloride-modified zeolite

被引：4
|
作者：
Sun, Yanli [1 ]
Lin, Jianwei [1 ]
Huang, Hong [1 ]
Zhang, Weiying [1 ]
Ma, Dandan [1 ]
机构：
[1] Shanghai Ocean Univ, Sch Marine Sci, Shanghai 201306, Peoples R China
来源：
PROGRESS IN ENVIRONMENTAL SCIENCE AND ENGINEERING (ICEESD2011), PTS 1-5 | 2012年 / 356-360卷
关键词：
calcium chloride-modified zeolite; ammonium; phosphate; simultaneous removal; FLY-ASH;
D O I：
10.4028/www.scientific.net/AMR.356-360.1581
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this study, the simultaneous adsorption characteristics of ammonium and phosphate from aqueous solution by calcium chloride-modified zeolite were investigated. Results showed that the adsorption kinetic data of ammonium and phosphate onto the calcium chloride-modified zeolite could be well described by a pseudo-second-order model. The adsorption equilibrium data of ammonium onto the calcium chloride-modified zeolite fitted to the Langmuir isotherm model better than the Freundlich and Dubinin-Radushkevich isotherm models. The phosphate removal efficiency of calcium chloride-modified zeolite increased with the initial concentration of ammonium in aqueous solution. The ammonium removal efficiency of calcium chloride-modified zeolite increased with increasing solution pH from 7.0 to 9.0, but decreased with increasing solution pH from 9.0 to 10.0. The phosphate removal efficiency of calcium chloride-modified zeolite increased dramatically with increasing solution pH from 7.0 to 9.0, but decreased with increasing solution pH from 9.0 to 10.0. The mechanism for the adsorption of ammonium onto the calcium chloride-modified zeolite was ions exchange, and the mechanism for the removal of phosphate by the calcium chloride-modified zeolite was chemical precipitation.
引用
收藏
页码：1581 / 1585
页数：5
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