Ex-Situ Biogas Upgrade in Plug-Flow Reactors

Κωστούλα, Μαριάνθη; Kostoula, Marianthi

dc.contributor.author	Κωστούλα, Μαριάνθη	el
dc.contributor.author	Kostoula, Marianthi	en
dc.date.accessioned	2017-02-21T10:25:44Z
dc.date.available	2017-02-21T10:25:44Z
dc.date.issued	2017-02-21
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/44396
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.13932
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights	Αναφορά Δημιουργού-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nd/3.0/gr/	*
dc.subject	Biogas Upgrade	en
dc.subject	UASB reactors	en
dc.subject	Hydrogenotrophic Methanogenesis	en
dc.subject	Anaerobic digestion	en
dc.subject	Environment	el
dc.subject	Packing material	en
dc.title	Ex-Situ Biogas Upgrade in Plug-Flow Reactors	en
heal.type	bachelorThesis
heal.secondaryTitle	Comparison between a control reactor and a reactor filled with packing material	en
heal.classification	Environmental engineering	en
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2016-10-03
heal.abstract	Biogas produced by anaerobic digestion, is mainly used in a gas motor for heat and electricity production. However, after removal of CO2, biogas can be upgraded to natural gas quality, giving more utilization possibilities, such as utilization as autogas, or distant utilization by using the existing natural gas grid. Biogas upgrading is the process of increasing the concentration of methane in biogas. Although this has been done since several decades at industrial scale via physical and chemical methods, these processes present some financial and environmental disadvantages, therefore new technologies are being developed. Recent studies show that biogas upgrading can be achieved via biological treatment using hydrogenotrophic methanogens fed with H2 and CO2. The SYMBIO project at the Department of Environmental Engineering of the Technical University of Denmark is working in this innovative way of biological biogas upgrading, where the hydrogen supplied to the process is obtained by water electrolysis using peak load/excess electricity from wind mills. After some research about in-situ biogas upgrading, ex-situ process was tested, resulting best performance for thermophilic regime, and the gas-liquid mass transfer being the rate-limiting step for efficient hydrogen utilization. The current study presents a new biological method for biogas upgrading into two separate, anaerobic, up-flow UASB biogas reactors one used as a control and one filed with packing material denoted R1 and R2 respectively. They contained an enriched culture of hydrogenotrophic methanogens (inoculum) and were fed via diffusers with a mixture of 62% CH4, 15% CO2 and 23% CH4, while providing the microorganisms with all the necessary nutrients through a liquid fully degassed digestate from manure. Both reactors operated under thermophilic conditions (550C) and the methanogens were enriched to convert CO2 to CH4 by addition of H2. Five different periods of various gas feeding and recirculation rates were tested. Enrichment at thermophilic temperature (550 C) resulted in CO2 and H2 bioconversion rate of 920 LCH4/Lreactorday for R2, which was 4% higher than that of R1 (537 LCH4/Lreactorday. Biogas upgrading was tested under various operation conditions. The produced biogas had a maximum CH4 content of 92% at steady-state, at gas feeding flow of 4,3 L/day (HRT=8 hours) and recirculation of 177,6 L/day.	en
heal.sponsor	DTU	en
heal.advisorName	Λυμπεράτος, Γεράσιμος	el
heal.committeeMemberName	Παπαδόπουλος, Γεώργιος	el
heal.committeeMemberName	Βλυσίδης, Απόστολος	el
heal.committeeMemberName	Λυμπεράτος, Γεράσιμος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Χημικών Μηχανικών. Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Χημικών Μηχανικών. Τομέας Σύνθεσης και Ανάπτυξης Βιομηχανικών Διαδικασιών (IV)	el
heal.academicPublisherID	ntua
heal.numberOfPages	81 σ.	el
heal.fullTextAvailability	true