Electrokinetic remediation for smelting sludge containing heavy metals: a novel method on pH control of catholyte

DOI

10.2991/eesed-16.2017.26How to use a DOI?

Keywords

Electrokinetic Remediation; Smelting Sludge; Heavy Metals; pH Control of Catholyte

Abstract

Electrokinetic remediation is an efficient and environmental friendly in-situ remediation technology for fine-grained soil or sludge. However, the problem of focusing phenomena caused by the pH values of sludge which controlled by the pH values of catholyte and polarization caused by the pH values of catholyte during electrokinetic process reduce the removal efficiency of heavy metals. In this work, an electrochemical method was designed, which was safety and environmental friendly to control the pH values of catholyte. The results of two experiments carried out five days under the constant voltage of 32V have shown that the removal rate of heavy metals of Cu, Ni, Pb, Cr and Zn in sludge is 15.63%, 15.65%, 9.35%, 42.86%, 8.35% when catholyte pH values controlled which is much better than pH uncontrolled 11.37%, 4.91%, 1.45%, 0%, 0% respectively. It was proved that focusing phenomena and polarization during electrokinetic process could be controlled.

Copyright

© 2017, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Yan-Ping Hu
AU  - Zhong-Guang Ji
AU  - Wei Wang
AU  - Li-Mei Yang
AU  - Zheng Xu
PY  - 2016/08
DA  - 2016/08
TI  - Electrokinetic remediation for smelting sludge containing heavy metals: a novel method on pH control of catholyte
BT  - 2nd Annual International Conference on Energy, Environmental & Sustainable Ecosystem Development (EESED 2016)
PB  - Atlantis Press
SP  - 203
EP  - 211
SN  - 2352-5401
UR  - https://doi.org/10.2991/eesed-16.2017.26
DO  - 10.2991/eesed-16.2017.26
ID  - Hu2016/08
ER  -