Influence of digestate recirculation and recirculation percentage on biogas production from lawn grass via anaerobic digestion

Noxolo T. Sibiya, Habtom B. Tesfagiorgis, Edison Muzenda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Recirculation of digestate either in the form of liquid or solids has proven to enhance biogas production from energy crops including lawn grass. The explanation to this is that digestate contains suitable bacteria and trace elements (nutrients) needed by methanogens. Influence of digestate recirculation and recirculation percentage in biogas production from lawn grass via anaerobic digestion was studied in laboratory scale digester (1L plastic bottles) at mesophilic condition. Three scenarios were used: digester without recycle digestate (control) (WRD), digestei's with recycled liquid digestate (RLD) and digesters with recycled solid digestate (RSD). Liquid recycled digestate was added in percentages variation ranging from 10%-60%, solid recycle digestate was added in percentages variation ranging from ll)%-50%. The maximum biogas production with methane content of 55% was obtained in the digester with 60% RLD on the 8lh day. During the study of recirculation of solids, highest biogas yield with methane content of 53% was observed in a digester with RSD of 40% on the 5th day. Retention time for both digesters with recycled digestate was reduced and biogas production rate was increased compared to the digester with no recycled digestate.

Original languageEnglish
Title of host publicationWCECS 2015 - World Congress on Engineering and Computer Science 2015
EditorsCraig Douglas, Jon Burgstone, Warren S. Grundfest, Jon Burgstone, Craig Douglas, S. I. Ao
PublisherNewswood Limited
Pages602-606
Number of pages5
Volume2220
ISBN (Electronic)9789881404725
Publication statusPublished - Jan 1 2015
Event2015 World Congress on Engineering and Computer Science, WCECS 2015 - San Francisco, United States
Duration: Oct 21 2015Oct 23 2015

Other

Other2015 World Congress on Engineering and Computer Science, WCECS 2015
CountryUnited States
CitySan Francisco
Period10/21/1510/23/15

All Science Journal Classification (ASJC) codes

  • Computer Science (miscellaneous)

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  • Cite this

    Sibiya, N. T., Tesfagiorgis, H. B., & Muzenda, E. (2015). Influence of digestate recirculation and recirculation percentage on biogas production from lawn grass via anaerobic digestion. In C. Douglas, J. Burgstone, W. S. Grundfest, J. Burgstone, C. Douglas, & S. I. Ao (Eds.), WCECS 2015 - World Congress on Engineering and Computer Science 2015 (Vol. 2220, pp. 602-606). Newswood Limited.