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Hydrothermal Carbonization of Sewage Sludge: Analysis of Process Severity and Solid Content
Author(s) -
Tasca Andrea Luca,
Stefanelli Eleonora,
Raspolli Galletti Anna Maria,
Gori Riccardo,
Mannarino Gemma,
Vitolo Sandra,
Puccini Monica
Publication year - 2020
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202000095
Subject(s) - hydrothermal carbonization , dewatering , sewage sludge , raw material , carbonization , yield (engineering) , pulp and paper industry , chemistry , waste management , materials science , chemical engineering , sewage treatment , environmental science , environmental engineering , adsorption , metallurgy , organic chemistry , engineering , geotechnical engineering
Hydrothermal carbonization of sewage sludge was carried out with the aim to evaluate the influence of process severity and initial solid content. Response surface methodology was applied to model yield and C yield responses. Enhanced dewaterability performance was recorded under mild processing conditions. The treatment promoted concentration and immobilization of Pb, Cd, Ni, Zn, and Cu. Variation of the solid content showed a stronger influence than severity on average yield and C yield. Higher heating values ( HHVs ) and energy retention efficiencies ( EREs ) of hydrochars obtained at the lowest solid content displayed the lowest values. Hence, the energy requirements of a first dewatering step should be compared with the related improvement in terms of HHV and ERE when sludge is used as feedstock.