Inhibitory mechanisms on dry anaerobic digestion: Ammonia, hydrogen and propionic acid relationship

Simple item page
dc.contributor.authorRocamora, Ildefonso
dc.contributor.authorWagland, Stuart T.
dc.contributor.authorHassard, Francis
dc.contributor.authorVilla, Raffaella
dc.contributor.authorPeces, Miriam
dc.contributor.authorSimpson, Edmon W.
dc.contributor.authorFernández, Oliver
dc.contributor.authorBajón Fernández, Yadira
dc.date.accessioned2023-03-22T16:09:04Z
dc.date.available2023-03-22T16:09:04Z
dc.date.issued2023-02-28
dc.description.abstractInhibitory pathways in dry anaerobic digestion are still understudied and current knowledge on wet processes cannot be easily transferred. This study forced instability in pilot-scale digesters by operating at short retention times (40 and 33 days) in order to understand inhibition pathways over long term operation (145 days). The first sign of inhibition at elevated total ammonia concentrations (8 g/l) was a headspace hydrogen level over the thermodynamic limit for propionic degradation, causing propionic accumulation. The combined inhibitory effect of propionic and ammonia accumulation resulted in further increased hydrogen partial pressures and n-butyric accumulation. The relative abundance of Methanosarcina increased while that of Methanoculleus decreased as digestion deteriorated. It was hypothesized that high ammonia, total solids and organic loading rate inhibited syntrophic acetate oxidisers, increasing their doubling time and resulting in its wash out, which in turn inhibited hydrogenotrophic methanogenesis and shifted the predominant methanogenic pathway towards acetoclastic methanogenesis at free ammonia over 1.5 g/l. C/N increases to 25 and 29 reduced inhibitors accumulation but did not avoid inhibition or the washout of syntrophic acetate oxidising bacteria.en_UK
dc.identifier.citationRocamora I, Wagland ST, Hassard F, et al., (2023) Inhibitory mechanisms on dry anaerobic digestion: Ammonia, hydrogen and propionic acid relationship. Waste Management, Volume 161, April 2023, pp. 29-42en_UK
dc.identifier.issn0956-053X
dc.identifier.urihttps://doi.org/10.1016/j.wasman.2023.02.009
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/19340
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectPropionic accumulationen_UK
dc.subjectSyntrophic acetogenic oxidationen_UK
dc.subjectButyric accumulationen_UK
dc.subjectMethanoculleusen_UK
dc.subjectHigh solids digestionen_UK
dc.subjectHydrogen inhibitionen_UK
dc.titleInhibitory mechanisms on dry anaerobic digestion: Ammonia, hydrogen and propionic acid relationshipen_UK
dc.typeArticleen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Inhibitory_mechanisms_on_dry_anaerobic_digestion-2023.pdf
Size:
2.62 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Staff publications (SWEE)