Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/2287
Title: Neutralization of an extremely acidic sludge and stabilization of heavy metals in flyash aggregates
Authors: Polat, Mehmet
Güler, Erkan
Lederman, Eli
Cohen, Haim
Polat, Mehmet
Izmir Institute of Technology. Chemical Engineering
Keywords: Sewage sludge
Acidity
Aggregates
Heavy metals
Fly ash
Issue Date: 2007
Publisher: Elsevier Ltd.
Source: Polat, M., Güler, E., Lederman, E., and Cohen, H. (2007). Neutralization of an extremely acidic sludge and stabilization of heavy metals in flyash aggregates. Waste Management, 27(4), 482-489. doi:10.1016/j.wasman.2006.02.012
Abstract: An extremely acidic, heavy metal-rich sludge (pH = -1.2) was scrubbed with a Class-F fly ash in order to simultaneously neutralize the acidity and stabilize the heavy metals contained in both wastes. This paper outlines the leaching behavior of the aggregate material generated by scrubbing. For proper fly ash/sludge ratios, the fly ash acted as an outstanding neutralizer for the acidic waste. Leaching of heavy metals from the aggregate samples was below the environmental limits within a pH range between 3 and 9. Subsequent washing of the leached aggregate with acidic CALWET solutions did not result in an additional release of heavy metals. It is proposed that coordinative bonding of the metal cations onto neutral surface sites and electrostatic adsorption led to stabilization of the heavy metals within the aggregate structure below hydrolysis pHs.
URI: http://doi.org/10.1016/j.wasman.2006.02.012
http://hdl.handle.net/11147/2287
ISSN: 0956-053X
0956-053X
1879-2456
Appears in Collections:Chemical Engineering / Kimya Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Sürdürülebilir Yeşil Kampüs Koleksiyonu / Sustainable Green Campus Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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