Investigation of Cu leaching from municipal solid waste incinerator bottom ash with a comprehensive approach

doi:10.1007/s11708-010-0131-9

Front Energ

2011, Vol. 5

Issue (3) : 340-348 https://doi.org/10.1007/s11708-010-0131-9

RESEARCH ARTICLE

Investigation of Cu leaching from municipal solid waste incinerator bottom ash with a comprehensive approach

Jun YAO¹, Wenbing LI¹, Fangfang XIA¹, Jing WANG¹, Chengran FANG², Dongsheng SHEN³(

)

1. Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China; 2. School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, China; 3. Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China; College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China

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Abstract

Municipal solid waste incinerator (MSWI) bottom ash is often reused as a secondary construction material. This study used a comprehensive approach to characterize the leaching behavior of copper (Cu) from the MSWI bottom ash. The batch titration procedure was used to determine the acid neutralizing capacity and Cu leaching as a function of pH. The sequential extraction procedure (SEP) was adopted to analyze the speciation of Cu in the MSWI bottom ash. The metal speciation equilibrium model for surface and ground water (Visual MINTEQ) was used to evaluate the equilibrium of the leachates with the relative minerals, and to determine the speciation of the aqueous Cu in the leachates. Based on the multi-analysis of the results, Cu would be significantly released from the MSWI bottom ash when it is acidic. The Cu leaching pattern was not only affected by dissolved organic carbon, it was also limited by its speciation in the MSWI bottom ash. Furthermore, almost 100% of the aqueous Cu in the leachate was bound to organic matter in basic and neutral conditions, but mostly existed as Cu²⁺ in an acidic condition. These findings provide an important insight into predicting the leaching behavior of Cu from the MSWI bottom ash, as well as its impact on the environment.

Keywords MSWI bottom ash Cu leaching batch titration procedure SEP

Corresponding Author(s): SHEN Dongsheng,Email:shends@zju.edu.cn

Issue Date: 05 September 2011

Cite this article:

Jun YAO,Wenbing LI,Fangfang XIA, et al. Investigation of Cu leaching from municipal solid waste incinerator bottom ash with a comprehensive approach[J]. Front Energ, 2011, 5(3): 340-348.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-010-0131-9
https://academic.hep.com.cn/fie/EN/Y2011/V5/I3/340

Tab.1 Physi-chemical properties of the MSWI bottom ash sample

Tab.2 Elemental composition of the MSWI bottom ash sample

Fig.1 XRD patterns of the MSWI bottom ash sample

Fig.2 The pH titration curve of the MSWI bottom ash sample

Fig.3 Dissolution of cations and anions as a function of acid added

Fig.4 Abbreviation: Cu(OH)—am-Cu(OH); Azurite—Azurite (Cu(OH)(CO)); Tenorite—Tenorite (CuO); Malachite—Malachite (Cu(OH)CO)
Cu concentration in the leachate as a function of pH [represented by symbols (Δ)], and Visual MINTEQ prediction assuming equilibrium with different mineral phases by (a) SHM model; (b) NICA-Donnan model; (c) Gaussian DOM model

Fig.5 Cu concentration in the leachate as a function of liquid-to-solid ratio (4 mmol H/g MSWI bottom ash acid addition)

Fig.6 F1—exchangeable fraction; F2—carbonate-bound fraction; F3—Fe—Mn oxide-bound fraction; F4—organic matter-bound fraction; F5—residue fraction
Speciation of Cu in the MSWI bottom ash sample

Tab.3 Speciation of Cu in the leachate by SHM and NICA-Donnan model unit:mol/L

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