Abstract
The impacts of feeding ratio and loading rate on the microbial community during co-digestion of grass silage with cow manure in an anaerobic laboratory continuously stirred tank reactor were investigated by 16S rRNA gene-based fingerprints. The microbial community remained stable when the reactor was fed with cow manure alone and with up to 20% of grass silage in feedstock at an organic loading rate (OLR) of 2 kg VS m−3 day−1. Large changes in the bacterial community were observed when the loading ratio of grass was increased to 40%, while there was little change in the archaeal community. During the increase in OLR from 2 to 4 kg VS m−3 day−1 the bacterial community structure showed few differences, whereas Archaea was undetectable. Sequencing of the major DGGE bands indicated that the phylum Bacteriodetes predominated in the bacterial community. Two unclassified bacteria with high abundance survived throughout the operation of the reactor.
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Acknowledgments
We are grateful to M. Sc. Suvi Huttunen for maintaining the reactor. We thank Leena Siitonen, Eila Korhonen and Elina Virtanen for their dedicated technical assistance. Dr. Anssi Lensu is acknowledged for his statistical expertise. We also thank Dr. Anna Kaksonen for kindly arranging the DGGE experiments. This work was supported by the Finnish Maj and Tor Nessling Foundation.
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Wang, H., Tolvanen, K., Lehtomäki, A. et al. Microbial community structure in anaerobic co-digestion of grass silage and cow manure in a laboratory continuously stirred tank reactor. Biodegradation 21, 135–146 (2010). https://doi.org/10.1007/s10532-009-9288-5
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DOI: https://doi.org/10.1007/s10532-009-9288-5