Immobilization of heavy metals in electroplating sludge by biochar and iron sulfide

Lyu, Honghong, Gong, Yanyan, Tang, Jingcshun, Huang, Yao and Wang, Qilin (2016) Immobilization of heavy metals in electroplating sludge by biochar and iron sulfide. Environmental Science and Pollution Research, 23 14: 14472-14488. doi:10.1007/s11356-016-6621-5

Author Lyu, Honghong
Gong, Yanyan
Tang, Jingcshun
Huang, Yao
Wang, Qilin
Title Immobilization of heavy metals in electroplating sludge by biochar and iron sulfide
Journal name Environmental Science and Pollution Research   Check publisher's open access policy
ISSN 1614-7499
Publication date 2016-04-11
Year available 2016
Sub-type Article (original research)
DOI 10.1007/s11356-016-6621-5
Open Access Status Not Open Access
Volume 23
Issue 14
Start page 14472
End page 14488
Total pages 17
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2017
Language eng
Formatted abstract
Electroplating sludge (ES) containing large quantities of heavy metals is regarded as a hazardous waste in China. This paper introduced a simple method of treating ES using environmentally friendly fixatives biochar (BC) and iron sulfide (FeS), respectively. After 3 days of treatment with FeS at a FeS-to-ES mass ratio of 1:5, the toxicity characteristic leaching procedure (TCLP)-based leachability of total Cr (TCr), Cu(II), Ni(II), Pb(II), and Zn(II) was decreased by 59.6, 100, 63.8, 73.5, and 90.5 %, respectively. After 5 days of treatment with BC at a BC-to-ES mass ratio of 1:2, the TCLP-based leachability was declined by 35.1, 30.6, 22.3, 23.1, and 22.4 %, respectively. Pseudo first-order kinetic model adequately simulated the sorption kinetic data. Structure and morphology analysis showed that adsorption, electrostatic attraction, surface complexation, and chemical precipitation were dominant mechanisms for heavy metals immobilization by BC, and that chemical precipitation (formation of metal sulfide and hydroxide precipitates), iron exchange (formation of CuFeS2), and surface complexation were mainly responsible for heavy metals removal by FeS. Economic costs of BC and FeS were 500 and 768 CNY/t, lower than that of Na2S (940 CNY/t). The results suggest that BC and FeS are effective, economic, and environmentally friendly fixatives for immobilization of heavy metals in ES before landfill disposal.
Keyword Biochar
Electroplating sludge
Hazardous waste
Heavy meals
Iron sulfide
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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