Solubility of heavy metals added to MSW

• Published in: Journal of hazardous materials 2009-01, Vol.161 (1), p.294-299
• Main Authors: Lo, H.M., Lin, K.C., Liu, M.H., Pai, T.Z., Lin, C.Y., Liu, W.F., Fang, G.C., Lu, C., Chiang, C.F., Wang, S.C., Chen, P.H., Chen, J.K., Chiu, H.Y., Wu, K.C.
• Format: Article
• Language: English
• Subjects: Adsorption; Applied sciences; Biological and medical sciences; Biotechnology; Buffer capacity; Chemical engineering; Cities; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; General treatment and storage processes; Heavy metals; Hydrogen-Ion Concentration; Metals, Heavy - analysis; Metals, Heavy - chemistry; Methods. Procedures. Technologies; MSW; Others; Partitioning; Pollution; Reactors; Refuse Disposal - methods; Solubility; Urban and domestic wastes; Various methods and equipments; Wastes
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2008.03.119

This paper aims to investigate the six heavy metal levels (Cd, Cr, Cu, Pb, Ni and Zn) in municipal solid waste (MSW) at different pHs. It intends to provide the baseline information of metals solubility in MSW co-disposed or co-digested with MSW incinerator ashes in landfill or anaerobic bioreactors or heavy metals contaminated in anaerobic digesters. One milliliter (equal to 1 mg) of each metal was added to the 100 ml MSW and the batch reactor test was carried out. The results showed that higher HNO 3 and NaOH were consumed at extreme pH of 1 and 13 compared to those from pH 2 to 11 due to the comparably higher buffer capacity. Pb was found to have the least soluble level, highest metal adsorption (%) and highest partitioning K d (l g −1) between pH 3 and 12. In contrast, Ni showed the highest soluble level, lowest metal adsorption (%) and lowest K d (l g −1) between pH 4 and 12. Except Ni and Cr, other four metals seemed to show the amphibious properties as comparative higher solubility was found in the acidic and basic conditions.