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Distribution of Metal Extractable Fractions during Anaerobic Sludge Treatment in Southern Spain WWTPs |
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| Authors: | Solís G J Alonso E Riesco P |
| Institution: | 1. Centre for the New Water Technologies (CENTA), Isla de La Cartuja, Pabellón del Agua, Avda. de Europa s/n, E-41092, Seville, Spain 2. Department of Analytical Chemistry, Faculty of Chemistry, University of Seville, Prof. García González, s/n, E-41012, Seville, Spain 3. Centro de las Nuevas Tecnologías del Agua (CENTA), Isla de la Cartuja-Pabellón del Agua, Avda. de Europa, s/n, E-41092, Seville, Spain |
| Abstract: | A new European Union legislation on sludge treatment isbeing introduced that will replace the one currently in force.The control of heavy metals is an important aspect of this newlegislation. The most common methodology to examine the metalcontent of sludges is determination of total metal contentafter total or pseudo total digestion of the sludge samples.Nevertheless, this kind of analysis is not informative on theavailability or mobility of the metals; a metal speciationanalysis is therefore required. In this study, sludge samplesfrom conventional activated sludge wastewater treatment plants(WWTP) were collected at different stages of an anaerobicsludge treatment process. In these samples, the total metalcontent and the distribution of metal species were determined(Al, Cd, Co, Cr, Cu, Fe, Hg, Mn, Mo, Ni, Pb, Ti, Zn) followinga protocol of sequential extraction. Only 14% of the metalwas present in readily available forms in the treated sludges.In composted sludges, this value dropped to 6%. |
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