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- Gunnarson, S., et al.
(author)
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Jerusalem artichoke (Helianthus tuberosus L.) for biogas production
- 1985
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In: Biomass. - : Elsevier BV. - 0144-4565. ; 7:2, s. 85-97
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Journal article (peer-reviewed)abstract
- The above-ground growth (stems and foliage) of Jerusalem artichoke (Helianthus tuberosus L.) was studied in field experiments in Sweden during 1981 to 1983, in order to investigate the possibility of producing biogas from biomass. Dry matter yields of three varieties were determined at four different harvesting times. The yields varied between 7 and 16 tons of dry matter per hectare. Anaerobic digestion experiments showed that fresh and ensiled above-ground parts of the plant could produce 480-680 litres biogas per kg organic material. The chemical composition of the plant material was determined before and after digestion. An analysis confirmed that economic biogas production from above-ground parts of Jerusalem artichoke is possible under certain conditions. © 1985.
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- Hansson, Mikael, et al.
(author)
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Early warning of disturbances in a laboratory-scale MSW biogas process.
- 2002
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In: Water Science and Technology. - 0273-1223 .- 1996-9732. ; 45:10, s. 255-260
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Journal article (peer-reviewed)abstract
- The use of near-infrared spectroscopy (NIR) to monitorthe dynamics of a biogas process was evaluated using multivariate data analysis. The digester was a completely stirred 8 I tank reactor fed with the organic fraction of source-sorted MSW. Intermittently the digester was overloaded with feed. Before and after overload on-line monitoring of NIR spectra and off-line analysis in the liquid and the gas phase of traditional chemical variables and microbial biomass, determined as total concentration of phospholipid fatty acids (PLFA and PLEL), were done. The dynamics that occurred due to overloading could be followed using principal component analysis of the obtained NIR-spectra. In addition, the response to changes in the digester fluid was reproducible and could be detected within five minutes, which can be considered as real-time monitoring. Selected wavelengths in the region 800-2,000 nm were used to make a PLS1 -regression with propionate. The regression resulted in a good correlation for propionate (R= 0.94 and RMSEP of 0.21 g/l in the range of 0.3-3 g/l). The results indicate the possibility to develop an early warning biogas control system based on near-infrared spectroscopy monitoring of propionate.
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