A prototype system for the hydrothermal oxidation of feces
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Autor:innen
Autor:in (Körperschaft)
Publikationsdatum
14.11.2022
Typ der Arbeit
Studiengang
Typ
01A - Beitrag in wissenschaftlicher Zeitschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
Water Research: X
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
17
Ausgabe / Nummer
Seiten / Dauer
Patentnummer
Verlag / Herausgebende Institution
Elsevier
Verlagsort / Veranstaltungsort
Amsterdam
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
To ensure access to safe sanitation facilities in rural communities, cheap off-grid technologies need to be
developed to substitute pit latrines and open defecation. In this study, we present a prototype system based on
hydrothermal oxidation, which, under optimal conditions, converts a fecal sludge simulant almost completely to
CO2 and water, leaving behind only a carbon-poor aqueous phase with the minerals. The prototype has been
designed to process the feces from two households. This technology does not only enable a fast and complete
conversion, but is potentially also very energy efficient, as the feed does not require any pre-treatment or drying.
The system was found to effectively remove 97–99% of the total organic carbon within a reaction time of 600 s
under an external energy demand of roughly 4 kWh per kilogram of wet feces by using the oxygen in air as an
oxidant. A total of ten experiments with varying injection pressure, total solids content of the feed, and residence
time in the reactor were performed to find experimental settings with high conversion. Only when the residence
time was decreased from 600 to 300 s did the conversion fall significantly below 97%. To reach a target value of
99.9% TOC conversion, the reactor temperature and/or the residence time must be increased further. To achieve
a system applicable in regions with no connection to the energy grid, the thermal loss of the reactor insulation
needs to be lowered further to achieve an overall thermally self-sustaining operation.
Schlagwörter
Fachgebiet (DDC)
620 - Ingenieurwissenschaften und Maschinenbau
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
Enddatum der Konferenz
Datum der letzten Prüfung
ISBN
ISSN
2589-9147
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Ja
Zukunftsfelder FHNW
Zero Emission
Publikationsstatus
Veröffentlicht
Begutachtung
Peer-Review der ganzen Publikation
Open Access-Status
Gold
Lizenz
Zitation
AFFOLTER, Joël, Thomas BRUNNER, Nicola HAGGER und Frédéric VOGEL, 2022. A prototype system for the hydrothermal oxidation of feces. Water Research: X. 14 November 2022. Bd. 17. DOI 10.1016/j.wroa.2022.100160. Verfügbar unter: https://doi.org/10.26041/fhnw-10697