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Comparative investigation on the value-added products obtained from continuous and batch hydrothermal liquefaction of sewage sludge

Fan, Y. 1; Prestigiacomo, Claudia; Gong, Miao; Tietz, Thomas 1; Hornung, Ursel 1; Dahmen, Nicolaus 1
1 Institut für Katalyseforschung und -technologie (IKFT), Karlsruher Institut für Technologie (KIT)

Abstract:

Hydrothermal liquefaction (HTL) can be considered a promising route for the energy valorisation of waste sewage sludge (SS). However, not much information is available on continuous flow processing. In this study, the mixed SS was subjected to HTL at 350°C for 8 min in a continuous reactor with loadings of 10 wt% in the feed flow. The results show that the mass recovery reached 88%, with a biocrude yield of 30.8 wt% (3.9 wt% N content). The recovered biocrude yields are highly dependent on the selection of the recovery solvent for extraction, and dichloromethane can contribute an additional 3.1 wt% biocrude from aqueous phase, acetone can extract some pyrrole derivatives into the trapped phases. Comparable results were also achieved by performing batch reactions under the same conditions: a slightly higher biocrude yield (33.1 wt%) with an N content of 4.3 wt%. The higher N content observed in the biocrude from the batch process indicates that interactions and chelation between intermediates are enhanced during heating up and cooling period, which lead to more N-containing compounds.


Verlagsausgabe §
DOI: 10.5445/IR/1000150211
Veröffentlicht am 30.08.2022
Originalveröffentlichung
DOI: 10.3389/fenvs.2022.996353
Scopus
Zitationen: 5
Web of Science
Zitationen: 3
Dimensions
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2296-665X
KITopen-ID: 1000150211
HGF-Programm 38.05.01 (POF IV, LK 01) Anthropogenic Carbon Cycle
Erschienen in Frontiers in Environmental Science
Verlag Frontiers Media SA
Band 10
Seiten Art.Nr. 996353
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 30.08.2022
Nachgewiesen in Scopus
Web of Science
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