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Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.1 P.125~132

http://doi.org/10.1631/jzus.A071272


Mechanisms of phosphate removal from aqueous solution by blast furnace slag and steel furnace slag


Author(s):  Sheng-gao LU, Shi-qiang BAI, Hong-dan SHAN

Affiliation(s):  College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, China

Corresponding email(s):   lusg@zju.edu.cn

Key Words:  Phosphate removal, Blast furnace slag (BFS), Steel furnace slag (SFS), Adsorption, Precipitation


Sheng-gao LU, Shi-qiang BAI, Hong-dan SHAN. Mechanisms of phosphate removal from aqueous solution by blast furnace slag and steel furnace slag[J]. Journal of Zhejiang University Science A, 2008, 9(1): 125~132.

@article{title="Mechanisms of phosphate removal from aqueous solution by blast furnace slag and steel furnace slag",
author="Sheng-gao LU, Shi-qiang BAI, Hong-dan SHAN",
journal="Journal of Zhejiang University Science A",
volume="9",
number="1",
pages="125~132",
year="2008",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A071272"
}

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%T Mechanisms of phosphate removal from aqueous solution by blast furnace slag and steel furnace slag
%A Sheng-gao LU
%A Shi-qiang BAI
%A Hong-dan SHAN
%J Journal of Zhejiang University SCIENCE A
%V 9
%N 1
%P 125~132
%@ 1673-565X
%D 2008
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A071272

TY - JOUR
T1 - Mechanisms of phosphate removal from aqueous solution by blast furnace slag and steel furnace slag
A1 - Sheng-gao LU
A1 - Shi-qiang BAI
A1 - Hong-dan SHAN
J0 - Journal of Zhejiang University Science A
VL - 9
IS - 1
SP - 125
EP - 132
%@ 1673-565X
Y1 - 2008
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A071272


Abstract: 
We report the adsorption of phosphate and discuss the mechanisms of phosphate removal from aqueous solution by burst furnace slag (BFS) and steel furnace slag (SFS). The results show that the adsorption of phosphate on the slag was rapid and the majority of adsorption was completed in 5~10 min. The adsorption capacity of phosphate by the slag was reduced dramatically by acid treatment. The relative contribution of adsorption to the total removal of phosphate was 26%~28%. Phosphate adsorption on BFS and SFS follows the Freundlich isotherm, with the related constants of k 6.372 and 1/n 1.739 for BFS, and of k 1.705 and 1/n 1.718 for SFS. The pH and Ca2+ concentration were decreased with the addition of phosphate, suggesting the formation of calcium phosphate precipitation. At pH 2.93 and 6.93, phosphate was desorbed by about 36%~43% and 9%~11%, respectively. These results indicate that the P adsorption on the slag is not completely reversible and that the bond between the slag particles and adsorbed phosphate is strong. The X-ray diffraction (XRD) patterns of BFS and SFS before and after phosphate adsorption verify the formation of phosphate salts (CaHPO4·2H2O) after adsorption process. We conclude that the removal of phosphate by BFS and SFS is related to the formation of phosphate calcium precipitation and the adsorption on hydroxylated oxides. The results show that BFS and SFS removed phosphate nearly 100%, indicating they are promising adsorbents for the phosphate removal in wastewater treatment and pollution control.

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