Conti, Federica

Rosendahl, Lasse

Shah, Ayaz Ali

Toor, Saqib

English

    Aalborg UniversitetHydrothermal liquefaction of high ash containing sewage sludge at sub andsupercritical conditionsShah, Ayaz Ali; Toor, Saqib; Conti, Federica; Rosendahl, LassePublication date:2019Document VersionPublisher's PDF, also known as Version of recordLink to publication from Aalborg UniversityCitation for published version (APA):Shah, A. A., Toor, S., Conti, F., & Rosendahl, L. (2019). Hydrothermal liquefaction of high ash containingsewage sludge at sub and supercritical conditions. Poster presented at 27th European Biomass Conference andExhibition (EUBCE 2019), Lisbon, Portugal.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: November 25, 2020Hydrothermal liquefaction of high ash containing sewage sludge at sub and supercritical conditions Ayaz A. Shah*, Saqib S. Toor *, Federica Conti *, and Lasse A. Rosendahl **Department of Energy Technology, Aalborg University, Pontoppidanstræde 111, Aalborg, 9220, Denmark.Results • The temperature had a negligible influence on bio-crude yield andquality, whereas catalyst (K2CO3) slightly improved both the yieldand quality.• The overall, 58-67% of the carbon went into the bio-crude at bothsub and supercritical conditions.• The bio-crude at supercritical conditions contained lower nitrogen,which indicates that higher temperature is favorable for lower N-content in bio-crude.• The supercritical aqueous phase contained high TOCs as comparedto subcritical. The overall TOCs of the aqueous phases in the rangeof 23 to 49 g/l, which could be used as a recirculation solvent.• Based on these batch scale experiments, it is challenging to choosean optimal condition for the production of bio-crude from sewagesludge, because, in continuous HTL processing, a lot of other aspectsneed to be considered.Bio-crude Quality from sewage sludgeBio-crude yields at sub and supercritical conditionsVolatility curves of bio-crude from sewage sludgeCarbon recovery in ProductsConclusion  Acknowledgements This research work was funded by the Higher Education Commission (HEC), Government of Pakistan. Proximate and ultimate analysis of sewage sludge (daf wt.%)Moisture Ash Protein Fat Carbohydrate73.39 40.63 43.16 7.79 48.16C H N O HHV (MJ/kg)50.95 7.36 6.91 34.78 22.150.005.0010.0015.0020.0025.0030.0035.0040.0045.0050.00 350-None 350-Catalytic  400-None 400-CatalyticYield daf (wt.%)Temperature (◦C) / Catalyst Biocrude SolidsSamples C (%) H(%) N(%) O(%) HHV (MJ/kg) ER (%)Sew. sludge 30.25 4.37 4.10 20.67 13.17 ----350-None 73.68 10.09 5.71 10.52 35.30 63.98350-Catalytic 75.51 10.56 4.69 9.24 36.60 74.60400-None 74.60 10.33 5.20 9.88 35.95 65.21400-Catalytic 75.75 10.22 3.77 10.26 36.21 71.04• To convert sewage sludge into the high quality bio-crude.• To investigate the effect of temperature and catalyst on productdistribution at sub and supercritical conditions.01020304050607080901000 100 200 300 400 500 600 700 800 900Weight (%)Temperature (°C)350-None350-Catalytic400-None400-Catalytic64.7158.9267.0258.1514.7919.6216.0624.334.673.895.852.6115.8317.5711.0714.91400-Catalytic400-None350-Catalytic350-NoneCarbon recovery (%)Temperature  (◦C) Bio-crude Solids Aqueous phase GasMethodology ObjectivesAbstractWith the rapid growth in population and urbanization, sustainabledisposal of sewage sludge has become a prominent problemworldwide. Therefore, an adequate treatment is required to reducethe environmental impacts created from traditional methods suchas incineration, landfill, etc. In this context, sewage sludge has beenliquefied hydrothermally under sub-supercritical conditions, withand without catalyst (K2CO3) in micro-batch reactors.A secondary Sewage sludge sample was collected from Aalborg EastWastewater Treatment Plant, Forsyning (Renseanlaeg Ost), AalborgEast, Denmark. Later on, the liquifaction experiments wereperformed at sub & supercritical conditions by adopting thefollowing methodology.Sewage sludge Sand bath 350 & 400 ºCHTL mixture Acetone solublesBio-crude + DEEBio-crude GasReactor washing with acetoneFiltration Acetone evaporationDEE evaporation DEEAqueous phaseSolid residue

Hydrothermal liquefaction of high ash containing sewage sludge at sub and supercritical conditions

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Hydrothermal liquefaction of high ash containing sewage sludge at sub and supercritical conditions

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