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J Colloid Interface Sci. 2006 Dec 15;304(2):300-6. Epub 2006 Oct 17.

Simultaneous removal of ammonium and phosphate by zeolite synthesized from fly ash as influenced by salt treatment.

Author information

  • 1School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. dywu@sjtu.edu.cn

Abstract

To develop an effective technique for enhancing the removal efficiency of ammonium and phosphate at low concentrations without losing potential removal capacity, Na-ZFA (zeolite synthesized from fly ash) was converted into Ca-, Mg-, Al-, and Fe-ZFA by salt treatment and the simultaneous removal of ammonium and phosphate by ZFA saturated with different cations was investigated. It was shown that Al3+-ZFA had the highest removal efficiencies (80-98%) for ammonium, followed by Mg2+ (43-58%), Ca2+ (40-54%), Na+ (<20%), and Fe3+ (<1%). Both alkaline pH values (in the cases of Na+, Ca2+, Mg2+) and acidic pH value (in the case of Fe3+) inhibited the sequestration of ammonium. At low initial phosphate concentrations, the efficiency of phosphate removal by Al3+- and Fe3+-ZFA approached 100%, followed by Ca2+ (60-85%), Na+ (<25%), and Mg2+ (<5%). The difference in phosphate removal efficiency was explained by the adsorption mechanisms. It was concluded that ZFA could be used in simultaneous removal of NH4+ and phosphate at low concentrations with presaturation by an appropriate cation such as Al3+ through salt treatment.

PMID:
17049547
DOI:
10.1016/j.jcis.2006.09.011
[PubMed - indexed for MEDLINE]
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