Nordberg, Åke
- Swedish Institute of Agricultural and Environmental Engineering (JTI)
Abstract
An anaerobic digester (8 1) was fed with the organic fraction of municipal solid waste and monitored intermittently for two years with on-line near-infrared (NIR) spectroscopy and traditional chemical parameters analysed off-line. The dynamics that occurred due to changes in substrate composition (changed C:N ratio) and changes in operating conditions (overloading) could be followed using principal component analysis of the obtained NIR-spectra. In addition, process disturbances such as failed stirring and increased foaming were readily detected by the NIR-spectra. Using PLS regression the propionate concentration could be predicted in the range 0.1-3.6 g/l, RMSEP 0.53 g/l with slope 0.74 and correlation coefficient 0.85. The response on changes in the digester fluid was reproducible and could be detected within 2.5 minutes, which can be considered as real-time monitoring.
Keywords
biogas; early warning; MSW; NIR; on-line; PCA; PLS; propionate
Published in
Water Science and Technology
2003, volume: 48, number: 4, pages: 9-13
Publisher: I W A PUBLISHING
SLU Authors
UKÄ Subject classification
Bioprocess Technology
Publication identifier
- DOI: https://doi.org/10.2166/wst.2003.0208
Permanent link to this page (URI)
https://res.slu.se/id/publ/86835