Ag, Hg and Cr Precipitation for Recycling Derived of Hazardous Liquid Waste

Abstract

Copyright © 2013 Silvia C. Gutiérrez-Gutiérrez et al. This is an open access article distributed under the Creative Commons Attribu-tion License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Production of different compounds can generate large amounts of hazardous wastes which are dangerous to the envi-ronment and human health. The disposal or treatment of hazardous liquid waste rich in heavy metals like silver (Ag), mercury (Hg) and chromium (Cr) is difficult due to the strong acidity and toxicity which usually present in these con-taminants. For this study, several research works were reviewed in order to obtain an efficient and viable treatment in time and removal efficiency. A series of chemical precipitations were evaluated for efficiency in the reduction of heavy metals in liquid waste. The precipitation of all three metals lasted 30 minutes and after treatment the wastewater pre-sented concentrations of 0.064 mg·L−1 Ag, 0.010 mg·L−1 Hg and 0.048 mg·L−1 Cr, with a standard pH (7.5- 8.5); wit