Abstract
A lightweight aggregate (LWA) was manufactured from municipal sewage sludge, gangue, and coal ash. The product performance and environmental safety of the sintered material were evaluated by changing the sludge blending ratio and sintering temperature. The distribution and migratory transformation characteristics of heavy metals in LWA were examined by BCR sequential extraction in combination with inductively coupled plasma optical emission spectrometry (ICP-OES). The environmental safety performance of LWA was comprehensively evaluated by the OPTI index for the first time. The leaching concentration of the heavy metals Pb, Ni, Cu, and Zn in raw materials without sintering reached 1.17, 1.6, 7.84, and 7.56 mg/L, respectively, far exceeding the regulatory threshold value. At 1250 °C, sintering with 60% sludge content resulted in Cu and Zn leaching concentrations of only 0.41 mg/L and 0.37 mg/L, respectively. Furthermore, a big portion of heavy metals were in the residual fraction of sintered LWA. The proportion of comprehensive pollutant toxicity index is only 199.17. Additionally, the mechanical properties of sintered LWA exceed the standards stipulated in the GB/T1743.1-2010 standard. Using sewage sludge to manufacture lightweight aggregate is not only environmentally safe but also produces LWA with good engineering characteristics.
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Funding
This research was financially supported by the “National Key Research and Development Program of China (project no. 2017YFC0703100)” and “National Natural Science Foundation of China” in the form of a research grant (no. 51576134).
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Highlights
(1) We studied a high-strength lightweight aggregate that is made from sludge/gangue/coal ash.
(2) We found the ratio 3:1:1 of sludge, coal ash and gangue with good engineering properties under 1250 °C.
(3) We established the OPTI index to evaluate the material’s environmental safety characteristics.
(4) The product has good environmental safety characteristics at the temperature of 1250 °C.
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Li, R., Shu, T., Li, Y. et al. Migration characteristics and toxicity evaluation of heavy metals during the preparation of lightweight aggregate from sewage sludge. Environ Sci Pollut Res 26, 9123–9136 (2019). https://doi.org/10.1007/s11356-019-04234-x
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DOI: https://doi.org/10.1007/s11356-019-04234-x