Phosphate removal from wastewater by model-La(III) zeolite adsorbents

被引:149
作者
Ning Ping [1 ]
Bart Hans-Joerg [2 ]
Li Bing [3 ]
Lu Xiwu [3 ]
Zhang Yong [1 ]
机构
[1] Kunming Univ Sci & Technol, Dept Environm Sci & Engn, Kunming 650093, Peoples R China
[2] TU Kaiserslautern, Lehrstuhl Therm Verfahrenstech, D-67653 Kaiserslautern, Germany
[3] Southeast Univ, Dept Environm Engn, Nanjing 210096, Peoples R China
基金
中国国家自然科学基金;
关键词
phosphate; adsorption; zeolite; regeneration; distribution coefficient;
D O I
10.1016/S1001-0742(08)62111-7
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Phosphorus is one of the primary nutrients which leads to eutrophication and accelerates aging process in enclosed water bodies. Because of the poor phosphorus selectivity of other adsorbents, the novel La(III)-modified zeolite adsorbent (LZA) was prepared by modifying 90 nm zeolite with lanthanide to selectively remove phosphate in the presence of various omnipresent anions, such as sulfates, bicarbonates, and chlorides. Through batch and fixed bed operation, the following optimum conditions were obtained: concentration of lanthanum chloride solution 0.05 mol/L; solid/liquor ratio 1/25; pH 10; calcination temperature 550 degrees C; time 1 h. The value of the Freundlich model constants K-f and l/n were found to be 16.76 mg/L and 0.2209, respectively. In addition, when calculated at pH 6.0, distribution coefficient K-D could be as high as 36.6. Furthermore, in the alkaline pH range, solution of 0.8 mol/L NaCl was used to regenerate the saturated LZA, which could reach the high regeneration efficiency as high as 100%. Because of the good selectivity and regenerability of LZA, it might serve as a potential way for advanced phosphate removal from the sewage containing other anions.
引用
收藏
页码:670 / 674
页数:5
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