title: Adsorption behavior of hydrothermally treated municipal sludge & pulp and paper industry sludge.
abstract: Aim of the study was to investigate how hydrothermal carbonization changes adsorption efficiency toward metal ions of typical sludges. Hydrothermal carbonization is a novel and green method of treating biomasses. Reactions take place in an aqueous environment at relatively mild temperature and high pressure resulting a different end biomass structure than obtained from traditional pyrolysis. Anaerobically digested sludge (ADS) and pulp and paper industry sludge (INS) were utilized as a feedstock. Adsorption behavior of ADS and INS was examined towards Pb(II), Cr(III), Cr(VI), As(III) and As(V). Both ADS and INS were found to remove Pb(II) effectively and followed Sips adsorption isotherm. Adsorption kinetics was fast and followed pseudo-second order model. Furthermore, intraparticle diffusion was observed to be partly responsible in the adsorption process. Hydrothermal carbonization indicated high potential for the production of novel carbonaceous materials for metal removal from waters.
authors.affiliation: Laboratory of Green Chemistry, Department of Chemistry, Lappeenranta University of Technology, Sammonkatu 12, FI-50130 Mikkeli, Finland. Electronic address: sara-maaria.alatalo@lut.fi.
authors.forename: Sara-Maaria
authors.initials: SM
authors.lastname: Alatalo
authors.affiliation: Laboratory of Green Chemistry, Department of Chemistry, Lappeenranta University of Technology, Sammonkatu 12, FI-50130 Mikkeli, Finland.
authors.forename: Eveliina
authors.initials: E
authors.lastname: Repo
authors.affiliation: Laboratory of Industrial Physics, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland.
authors.forename: Ermei
authors.initials: E
authors.lastname: Mäkilä
authors.affiliation: Laboratory of Industrial Physics, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland.
authors.forename: Jarno
authors.initials: J
authors.lastname: Salonen
authors.affiliation: Laboratory of sustainable energy systems, LUT Energy, Lappeenranta University of technology, Skinnarilankatu 34, FI-53850 Lappeenranta, Finland.
authors.forename: Esa
authors.initials: E
authors.lastname: Vakkilainen
authors.affiliation: Laboratory of Green Chemistry, Department of Chemistry, Lappeenranta University of Technology, Sammonkatu 12, FI-50130 Mikkeli, Finland.
authors.forename: Mika
authors.initials: M
authors.lastname: Sillanpää
mesh_terms: D000327:Adsorption; D019216:Metals, Heavy / Q000737:chemistry; D010209:Paper; D012722:Sewage; D013783:Textile Industry
chemical_list: D019216:Metals, Heavy; D012722:Sewage
keywords: Adsorption; Hydrothermal carbonization; Metals; Modeling; Sludge