Removal of ionic metals from wastewaters of COD determinations Online publication date: Sat, 13-Dec-2014
by Sérgio Alberto Cruz Monteiro De Morais; Maria Aurora Soares da Silva; Maria Isabel Viana Limpo Serra; Maria Isabel Branco Martins; Cristina Maria Fernandes Deler Alvim de Matos; M.G.F. Sales
International Journal of Environment and Waste Management (IJEWM), Vol. 10, No. 2/3, 2012
Abstract: Chemical Oxygen Demand (COD) determinations generate highly disruptive waste streams with chromium, mercury and silver. These should follow specific waste management approaches in search of environmental and economical benefits, for which this work reports simple chemical procedures allowing toxic metal removal. Chromium(VI) is reduced to chromium(III) and total chromium is precipitated with sodium hydroxide. Silver is precipitated with chloride and mercury with iodide. Enhanced reduction of mercury levels is achieved by adsorption to activated carbon. Treated wastewaters have Cr, Ag and Hg levels of 225, 410 and 2.25 ppb, respectively, and the purity of the produced solids is always >80%.
Online publication date: Sat, 13-Dec-2014
Go to Inderscience Online Journals to access the Full Text of this article.
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Environment and Waste Management (IJEWM):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email firstname.lastname@example.org