Methanogenic community changes, and emissions of methane and other gases, during storage of acidified and untreated pig slurry
Article first published online: 4 APR 2014
© 2014 The Society for Applied Microbiology
Journal of Applied Microbiology
Volume 117, Issue 1, pages 160–172, July 2014
How to Cite
Petersen, S.O., Højberg, O., Poulsen, M., Schwab, C. and Eriksen, J. (2014), Methanogenic community changes, and emissions of methane and other gases, during storage of acidified and untreated pig slurry. Journal of Applied Microbiology, 117: 160–172. doi: 10.1111/jam.12498
- Issue published online: 16 JUN 2014
- Article first published online: 4 APR 2014
- Accepted manuscript online: 17 MAR 2014 10:58AM EST
- Manuscript Accepted: 13 MAR 2014
- Manuscript Revised: 10 MAR 2014
- Manuscript Received: 17 DEC 2013
- Danish Ministry of Food, Agriculture and Fisheries
- slurry acidification;
- Thermoplasmata ;
Acidification with concentrated H2SO4 is a novel strategy to reduce NH3 emissions from livestock slurry. It was recently found that also CH4 emissions from acidified slurry are reduced. This study investigated the microbiological basis and temporal stability of these effects.
Methods and Results
Pig slurry from two farms, acidified by different techniques or untreated, was stored for 83 days in a pilot-scale facility. Methanogens were characterized before and after storage by T-RFLP and qPCR targeting mcrA. Emissions of NH3 and CH4 during storage were quantified. Acidified slurry pH was nearly constant at values of 5·5 and 6·5. Ammonia losses were reduced by 84 and 49%, respectively, while CH4 emission with both acidification techniques was reduced by >90%. T-RFLP fingerprints showed little effect of acidification or storage time. A major T-RF of 105 bp could represent methanogens related to Thermoplasmata (Tp). No treatment effects on gene copy numbers were seen with universal methanogen primers, whereas effects were found with Tp-specific primers.
Methane emissions were reduced >90% during storage. Thermoplasmata-related methanogens could be involved in CH4 emissions from pig slurry.
Significance and Impact of the Study
The effect of acidification on CH4 emissions during storage of pig slurry was quantified for the first time. Acidification with sulphuric acid holds promise as a novel greenhouse gas mitigation strategy for confined livestock production.