Full Text:   <3122>

CLC number: X705

On-line Access: 2013-03-04

Received: 2012-10-13

Revision Accepted: 2013-01-16

Crosschecked: 2013-02-22

Cited: 4

Clicked: 4919

Citations:  Bibtex RefMan EndNote GB/T7714

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Journal of Zhejiang University SCIENCE A 2013 Vol.14 No.3 P.177-186


Immobilization of heavy metals in sludge using phosphoric acid and monobasic calcium phosphate*

Author(s):  Ping Tang1, Yong-chao Zhou2, Zhen-miao Xie1

Affiliation(s):  1. College of Environment and Material Engineering, Hangzhou Dianzi University, Hangzhou 310027, China; more

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

Key Words:  Tannery sludge, Bottom ash, Heavy metals, Phosphate, Stabilization

Ping Tang, Yong-chao Zhou, Zhen-miao Xie. Immobilization of heavy metals in sludge using phosphoric acid and monobasic calcium phosphate[J]. Journal of Zhejiang University Science A, 2013, 14(3): 177-186.

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author="Ping Tang, Yong-chao Zhou, Zhen-miao Xie",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Immobilization of heavy metals in sludge using phosphoric acid and monobasic calcium phosphate
%A Ping Tang
%A Yong-chao Zhou
%A Zhen-miao Xie
%J Journal of Zhejiang University SCIENCE A
%V 14
%N 3
%P 177-186
%@ 1673-565X
%D 2013
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1200263

T1 - Immobilization of heavy metals in sludge using phosphoric acid and monobasic calcium phosphate
A1 - Ping Tang
A1 - Yong-chao Zhou
A1 - Zhen-miao Xie
J0 - Journal of Zhejiang University Science A
VL - 14
IS - 3
SP - 177
EP - 186
%@ 1673-565X
Y1 - 2013
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1200263

The purpose of this research is to investigate the potential of pre-treatment with phosphoric acid (PA) and monobasic calcium phosphate (MCP) for the stabilization of heavy metals in sludge and its bottom ash. The tannery sludge samples were collected in Wenzhou, China and heavily contaminated with heavy metals, such as Pb, Cr and so on. The samples were pre-treated with PA or MCP. Then XRD and TCLP tests were adopted as the evaluating methods to characterize the Pb, Cr, Cu, Zn and Cd immobilization in the pre-treated sludge and its bottom ash. The results showed that this treatment effectively immobilized Pb and Cd in the sludge, lightly stabilized the metal Cu, and adversely, enhanced the leachability of Zn. After incineration at 900 °C, Pb and Cr in the bottom ash of pre-treated sludge were significantly stabilized due to the formation of their highly thermostable phosphates and pyromorphite-like minerals during the incineration process. However, an increase of Cu and Zn solubility was observed which might be attributable to the acidification of sludge due to the addition of PA or MCP.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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