Role of trace elements in single and two-stage digestion of food waste at high organic loading rates

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dc.contributor.authorVoelklein, Markus A.
dc.contributor.authorO'Shea, Richard
dc.contributor.authorJacob, Amita
dc.contributor.authorMurphy, Jerry D.
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderSeventh Framework Programmeen
dc.contributor.funderEuropean Commissionen
dc.contributor.funderGas Networks Irelanden
dc.date.accessioned2017-02-08T14:40:27Z
dc.date.available2017-02-08T14:40:27Z
dc.date.issued2017-01-04
dc.date.updated2017-02-08T14:27:36Z
dc.description.abstractThis study investigated trace element deficiency and supplementation in mono-digestion of food waste. A single-stage system was contrasted to a two-stage system (hydrolysis followed by methanogenisis). Initial hydrolysis is beneficial as it releases hydrogen sulphide (H2S), while the prevailing pH prevents an associated H2S induced precipitation of trace elements (TE). Stable digestion took place without TE supplementation until an organic loading rate (OLR) of 2.0 g VS L−1 d−1; this was followed by severe instability at an OLR of 2.5 g VS L−1 d−1 in both systems. A major accumulation of volatile fatty acids (VFA) inhibited methanogenic activity. A gradual deterioration of pH, VFA/TIC (ratio of VFA to alkalinity) and specific methane yields provoked reactor failure. The benefit of enhanced TE availability in the two-stage system was not apparent due to the complete absence of essential TE in the feed stock. Supplementation of deficient TE (Co, Fe, Mo, Ni and Se) induced recovery, reflected by an immediate improvement of VFA/TIC and VFA concentrations in both systems. Specific methane yields were restored and maintained at initial levels. At a 16 day retention time, elevated loading rates as high as 5 g VS L−1 d−1 allowed stable digestion with TE supplementation.en
dc.description.sponsorshipScience Foundation Ireland (SFI centre MaREI (12/RC/2302)); Gas Networks Ireland (The Green Gas Innovation Group and by ERVIA.)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationVoelklein, M. A., O' Shea, R., Jacob, A. and Murphy, J. D. (2017) 'Role of trace elements in single and two-stage digestion of food waste at high organic loading rates', Energy, 121, pp. 185-192. doi:10.1016/j.energy.2017.01.009en
dc.identifier.doi10.1016/j.energy.2017.01.009
dc.identifier.endpage192en
dc.identifier.issn0360-5442
dc.identifier.journaltitleEnergyen
dc.identifier.startpage185en
dc.identifier.urihttps://hdl.handle.net/10468/3592
dc.identifier.volume121en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP3::PEOPLE/316838/EU/Advanced Technologies for Biogas Efficiency Sustainability andTransport/ATBESTen
dc.rights© 2016 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 licenseen
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectBiogasen
dc.subjectTwo-stage digestionen
dc.subjectFood wasteen
dc.subjectTrace elementsen
dc.subjectHigh performanceen
dc.titleRole of trace elements in single and two-stage digestion of food waste at high organic loading ratesen
dc.typeArticle (peer-reviewed)en
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