Changes in composition and lead speciation due to water washing of air pollution control residue from municipal waste incineration

DOI: 10.1016/j.jhazmat.2018.08.051

Authors: A. A. Bogush (University College London (UCL)) , J. A. Stegemann (University College London (UCL)) , A. Roy (Louisiana State University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Hazardous Materials

State: Published (Approved)
Published: August 2018
Diamond Proposal Number(s): 11156

Abstract: Changes in elemental and mineralogical composition, and lead speciation, of air pollution control residue (APCR) from municipal solid waste incineration, due to treatment by water washing, were investigated in this work and are reported in the context of a review of the literature. Water washing was shown to substantially modify the nature of APCR by: 1) removing 23% dry mass soluble salts to disagglomerate particles and significantly reduce concentrations of the associated major elements, and increase concentrations of insoluble matrix elements and potential pollutants; and 2) respeciating elements to form new phases. X-ray absorption near edge spectroscopy (XANES) showed that the 500 mg/kg of Pb in raw and washed APCR were comprised mainly of Pb-glass, with some PbSO4, and small amounts of PbO and PbCl2. Semi-quantitative linear combination fitting suggests that the glass in the APCR may be unstable and release Pb under the alkaline pH of water washing, to reprecipitate as PbO. Chemical analysis suggests that some Pb may be removed by washing. Scientific understanding of the composition of raw and washed APCR, and particularly the speciation of potentially toxic metals, such as Zn and Pb, can help in developing effective element recovery and residue treatment, utilization or disposal strategies.

Journal Keywords: municipal waste incinerator ash; energy-from-waste; EfW; waste-to-energy; WtE; leaching; extraction

Subject Areas: Environment, Chemistry, Materials


Instruments: B18-Core EXAFS

Added On: 21/08/2018 15:22

Documents:
1-s2.0-S030438941830726X-main.pdf

Discipline Tags:

Desertification & Pollution Earth Sciences & Environment Chemistry Materials Science Inorganic Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) X-ray Absorption Near Edge Structure (XANES)