Release of elements from municipal solid waste incineration fly ash

doi:10.1007/s11783-010-0245-7

Front Envir Sci Eng Chin

2010, Vol. 4

Issue (4) : 482-489 https://doi.org/10.1007/s11783-010-0245-7

RESEARCH ARTICLE

Release of elements from municipal solid waste incineration fly ash

Wei WANG, Lei ZHENG(

), Feng WANG, Xiao WAN, Keqing YIN, Xingbao GAO

Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China

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Abstract

The element-release behavior of municipal solid waste incineration fly ash was explored through leaching test with continuous set-point pH (pH_stat test) and serial single reaction cell (SSRC) tests. First, the relationship between element release and acid neutralizing capacity (ANC) consumption was examined with a pH_stat test. Four types of release behaviors were identified which are characteristic for different elements: (1) release curves that were almost linear with ANC consumption (Ca, Zn, and Cd); (2) release that was significantly faster than ANC (Na, K, and Cl); (3) curves that featured a strong increase with ANC consumption, after a transient release, followed by an almost equal decrease (Si and S); and (4) release that is strongly retarded compared with ANC consumption (Cr, Cu, and Pb). In the SSRC system, it the existence of a pH front and a wash-out phenomenon is demonstrated. Combining the results from the SSRC test with the kinetic analysis of the ANC system in the pH_stat test, it was inferred that less than one-third of the ANC measured from a batch pH titration plays a neutralization role in a field situation. The methodologies described may provide a powerful set of tools for systematic evaluation of element release from solid wastes.

Keywords pH_stat test Serial single reaction cell test (SSRC) leaching heavy metal

Corresponding Author(s): ZHENG Lei,Email:zhenl@mails.tsinghua.edu.cn

Issue Date: 05 December 2010

Cite this article:

Wei WANG,Lei ZHENG,Feng WANG, et al. Release of elements from municipal solid waste incineration fly ash[J]. Front Envir Sci Eng Chin, 2010, 4(4): 482-489.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-010-0245-7
https://academic.hep.com.cn/fese/EN/Y2010/V4/I4/482

Fig.1

Results of pH_stat tests at different pH levels. (a) measured ANC curves and fitted curves for four pH levels; (b-f) cumulative concentrations of elements evolved with ANC release

Fig.2

pH values and elements concentration changes in the SSRC system at different L/S ratios. For element variety (except for Na, K, and Cl), both (a) concentration in residue and (b) concentration in solution (releases at L/S= 6.5 are read on the top horizontal axis; releases at L/S= 10 are read on the bottom horizontal axis) along the flow path are shown

Fig.3

XRD analyses of fly ash samples under the L/S of 10 compared with the original fly ash sample. (a, SiO₂; b, CaSO₄; c, KCl; d, (K, Na)₃Na(SO₄)₂; e, NaCl; f, Ca₃SiO₅; g, Na₆Fe(SO₄)₄)

Tab.1

Chemical composition of MSWI fly ash and the total release ratio of components during pH_stat tests at different pH values

Tab.2

Calculated buffer capacities and rate coefficients

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