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DatoValore
TitlePre-treatments and anaerobic hydrolysis as strategical key steps for resource recovery from sludge: The role of disintegration degree in metals leaching
AbstractFuture sustainable technological solutions need to balance the development of sewage sludge as resource against the paramount necessity to protect human health and environment. Nutrients, high value metals, embedded energy, and the avoidance of sludge handling costs are important examples of recoverable assets. Aim of this study was to assess the feasibility of sludge pre-treatments as ultrasound and thermal hydrolysis to promote the release of metals due to organics disintegration, and to investigate the efficiency of the anaerobic process to leach out metals from municipal sludge through an enhanced hydrolysis/acidification step. A preliminary deep analysis of elements concentration (Al, As, Ca, Cd, Co, Cr, Cu, Fe, Ga, Mg, Mn, Na, Ni, Pb, Se, V and Zn) in solid residue and water phase of waste activated sludge and anaerobic digestate sampled at full scale wastewater treatment plant (WWTP) allowed to calculate partitioning coefficients and equilibrium concentrations, in order to predict metal mobility and bioavailability. The gradual sludge disintegration and organics hydrolysis significantly contribute to the leaching of toxic elements as As, Ga, Se and Zn, increasing their removal potential. A new anaerobic bioleaching approach will be presented, aiming to develop a sustainable platform to recover metals, together with methane and a clean recyclable digestate.
SourceJournal of Environmental Chemical Engineering 104649
KeywordsSludgepre-treatmentsheavy metalsanaerobic hydrolysiswaste activated sludge
JournalJournal of Environmental Chemical Engineering
EditorElsevier B.V., ,
Year2021
TypeArticolo in rivista
DOI10.1016/j.jece.2020.104649
AuthorsBarbara Tonanzi, Agata Gallipoli, Maria Cristina Annesini, Cristiana La Penna, Andrea Gianico, Camilla Maria Braguglia
Text437684 2021 10.1016/j.jece.2020.104649 Sludge pre treatments heavy metals anaerobic hydrolysis waste activated sludge Pre treatments and anaerobic hydrolysis as strategical key steps for resource recovery from sludge The role of disintegration degree in metals leaching Barbara Tonanzi, Agata Gallipoli, Maria Cristina Annesini, Cristiana La Penna, Andrea Gianico, Camilla Maria Braguglia Istituto di Ricerca sulle Acque IRSA CNR di Roma, Dipartimento di Ingegneria Chimica Universita degli Studi di Roma La Sapienza , Rome, Italy Future sustainable technological solutions need to balance the development of sewage sludge as resource against the paramount necessity to protect human health and environment. Nutrients, high value metals, embedded energy, and the avoidance of sludge handling costs are important examples of recoverable assets. Aim of this study was to assess the feasibility of sludge pre treatments as ultrasound and thermal hydrolysis to promote the release of metals due to organics disintegration, and to investigate the efficiency of the anaerobic process to leach out metals from municipal sludge through an enhanced hydrolysis/acidification step. A preliminary deep analysis of elements concentration Al, As, Ca, Cd, Co, Cr, Cu, Fe, Ga, Mg, Mn, Na, Ni, Pb, Se, V and Zn in solid residue and water phase of waste activated sludge and anaerobic digestate sampled at full scale wastewater treatment plant WWTP allowed to calculate partitioning coefficients and equilibrium concentrations, in order to predict metal mobility and bioavailability. The gradual sludge disintegration and organics hydrolysis significantly contribute to the leaching of toxic elements as As, Ga, Se and Zn, increasing their removal potential. A new anaerobic bioleaching approach will be presented, aiming to develop a sustainable platform to recover metals, together with methane and a clean recyclable digestate. 104649 Published version https //www.sciencedirect.com/science/article/abs/pii/S2213343720309982 tonanzi et al., 2020 . tonanzi et al., 2020.pdf Articolo in rivista Elsevier B.V. 2213 3437 Journal of Environmental Chemical Engineering Journal of Environmental Chemical Engineering TONANZI BARBARA camillamaria.braguglia BRAGUGLIA CAMILLA MARIA andrea.gianico GIANICO ANDREA agata.gallipoli GALLIPOLI AGATA TA.P07.001.005 Recupero di risorse da rifiuti e biomasse