Abstract
High level of heavy metals in industrial sludge was the obstacle of sludge disposal and resource recycling. In this study, iminodisuccinic acid (IDS), a biodegradable chelating ligand, was used to remove heavy metals from industrial sludge generated from battery industry. The extraction of cadmium, copper, nickel, and zinc from battery sludge with aqueous solution of IDS was studied under various conditions. It was found that removal efficiency greatly depends on pH, chelating agent’s concentration, as well as species distribution of metals. The results showed that mildly acidic and neutral systems were not beneficial to remove cadmium. About 68 % of cadmium in the sample was extracted at the molar ratio of IDS to heavy metals 7:1 without pH adjustment (pH 11.5). Copper of 91.3 % and nickel of 90.7 % could be removed by IDS (molar ratio, IDS: metals = 1:1) with 1.2 % phosphoric acid effectively. Removal efficiency of zinc was very low throughout the experiment. Based on the experimental results, IDS could be a potentially useful chelant for heavy metal removal from battery industry sludge.
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This work was supported by the Innovation Scientists and Technicians Troop Construction Projects of Henan Province, Plan for Scientific Innovation Talent of Henan Province (Grant no. 134200510014), Key Scientific and Technological Project of Henan Province (Grant no. 142102310275), and Graduate Student Scientific Research Innovation Project of Henan Normal University (Grant no. YL201426).
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Wu, Q., Duan, G., Cui, Y. et al. Removal of heavy metal species from industrial sludge with the aid of biodegradable iminodisuccinic acid as the chelating ligand. Environ Sci Pollut Res 22, 1144–1150 (2015). https://doi.org/10.1007/s11356-014-3365-y
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DOI: https://doi.org/10.1007/s11356-014-3365-y