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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 754 pages |
| ISBN: | 978-0-9879917-3-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
Solidification And Stabilization Of Metal Finishing Sludge
Cemile Yerlikaya1; Ali Oztürk1; Halil Dertli1; Hasancan Okutan1;1ITU, Istanbul, Turkey;
Type of Paper: Regular
Id Paper: 326
Topic: 12
Abstract:
The solid wastes resulting from the physical, chemical and biological treatment of used solutions from metal coating processes are termed as metal finishing sludges or metal hydroxide sludges. These wastes are generally of inorganic character and contain high levels of heavy metals and anions. Metal finishing sludges are considered as “hazardous waste” in many countries and are disposed of at sites designed specifically for hazardous wastes. Cadmium, copper, lead, nickel and zinc are the most widely studied heavy metals in metal finishing sludges and are on the list of priority pollutants compiled by the United States Environmental Protection Agency (US EPA). Solidification is one of the remediation processes, in which waste materials are mixed with various binding media to obtain a new product with improved physical properties. Immobilization within a cement-matrix does not require expensive thermal treatments to render hazardous waste inert and in a stable form. The final product is resistant to aggressive environmental agents and can be safely stored in landfill sites. In order to evaluate the possibility of soil and water contamination during the storage, leachability tests of the solidified waste have to be performed. In this study, we aimed to reduce the contamination of high level heavy metal pollution by using the solidification/stabilization (S/S) method with different additive materials and cement. Leaching potential of metal ions after S/S procedure was evaluated by two different leaching tests, toxicity characteristic leaching procedure (TCLP) and DIN 38414 methods by using acetic acid solution and water, respectively. Leaching tests were performed in a shaker during 18 h and 24 h, respectively. The concentrations of heavy metals in liquid extracts were measured by Flame Atomic Absorption Spectrometry (FAAS).Cement based S/S process techniques using different construction and insulation additives can be effectively applied in order to sufficiently treat these metal hydroxide sludges containing heavy metals.