Indigenous microbial capability in solid manure residues to start-up solid-phase anaerobic digesters
Article
Article Title | Indigenous microbial capability in solid manure residues to start-up solid-phase anaerobic digesters |
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ERA Journal ID | 4691 |
Article Category | Article |
Authors | Yap, S. D. (Author), Astals, S. (Author), Jensen, P. D. (Author), Batstone, D. J. (Author) and Tait, S. (Author) |
Journal Title | Waste Management |
Journal Citation | 64, pp. 79-87 |
Number of Pages | 8 |
Year | 2017 |
Publisher | Elsevier |
Place of Publication | Oxford , England |
ISSN | 0956-053X |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.wasman.2017.02.031 |
Web Address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S0956053X17301095 |
Abstract | Batch solid-phase anaerobic digestion is a technology for sustainable on-farm treatment of solid residues, but is an emerging technology that is yet to be optimised with respect to start-up and inoculation. In the present study, spent bedding from two piggeries (site A and B) were batch digested at total solids (TS) concentration of 5,10 and 20% at mesophilic (37 degrees C) and thermophilic (55 degrees C) temperatures, without adding an external inoculum. The results showed that the indigenous microbial community present in spent bedding was able to recover the full methane potential of the bedding (140 +/- 5 and 227 +/- 6 L CH4 kgVS(Fed)(-1) for site A and B, respectively), but longer treatment times were required than for digestion with an added external inoculum. Nonetheless, at high solid loadings (i.e. TS level > 10%), the digestion performance was affected by chemical inhibition due to ammonia and/or humic acid. Thermophilic temperatures did not influence digestion performance but did increase start-up failure risk. Further, inoculation of residues from the batch digestion to subsequent batch enhanced start-up and achieved full methane potential recovery of the bedding. Inoculation with liquid residue (leachate) was preferred over a solid residue, to preserve treatment capacity for fresh substrate. Overall, the study highlighted that indigenous microbial community in the solid manure residue was capable of recovering full methane potential and that solid-phase digestion was ultimately limited by chemical inhibition rather than lack of suitable microbial community. |
Keywords | anaerobic digestion, microbial community, manure, straw, inoculum, biological inhibition |
ANZSRC Field of Research 2020 | 401102. Environmentally sustainable engineering |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Queensland |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5284/indigenous-microbial-capability-in-solid-manure-residues-to-start-up-solid-phase-anaerobic-digesters
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