Investigations of leachability characteristics of metal contaminants from plating and galvanising solid wastes by TCLP

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "dejavu="" sans";mso-hansi-theme-font:minor-latin;mso-bidi-font-family:mangal;="" mso-bidi-theme-font:minor-bidi;color:#00000a;mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">In the present investigation, Toxicity Characteristics· Leaching Procedure (TCLP) has been employed to investigate the leachability characteristics of metal contaminants from plating and galvanising wastes. Atomic absorption spectroscopy (AAS) analysis of extracts of Cr-plating waste indicates that leachability of Cr, Fe, Pb and Mn in secondary extract is high as compared to primary extract. Occurrence of notably high concentration of Zn and Fe in primary extract of galvanising waste suggests their immediate leachability in s6il. Toxicity due to Pb and Mn of plating and galvanising waste is expected to be quite high in immediate and long-term duration because of their significant leachability in primary and secondary extract. With an increase of temperature from 30 to 60°C, the leachability of Cr from plating waste and Zn from galvanising waste increases significantly while a slight increase of leachability of Fe, Pb and Mn is noticed in both wastes.</span>