The ability of using novel method of near-infrared (NIR) spectra to predict the composition and higher heating value (HHV) of dry pig manure was examined. Number of pig manure solid fractions variously pre-treated samples were collected in Denmark, from different pig slurry treatment plants (using mechanical or chemical–mechanical separation) and then analysed for their energy values. These values were determined by conventional method using bomb calorimetry and also calculated based on ultimate analysis. NIR spectra method was successfully applied and reasonable R2 values were obtained for the independent prediction set for nitrogen, ash, and the HHV. NIR also showed ability for predicting which type of treatment plants the samples came from. In addition, new empirical equations, based on ultimate analyses of pig manure solids used for prediction of the HHV was established.
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This research was partially supported by The Danish Council for Strategic Research, Danish Ministry of Science, Technology and Innovation, the program for sustainable energy and environment the project CLEANWASTE (Project No. J. nr. 2104-09-0056).
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Wnetrzak, R., Hayes, D.J.M., Jensen, L.S. et al. Determination of the Higher Heating Value of Pig Manure. Waste Biomass Valor 6, 327–333 (2015). https://doi.org/10.1007/s12649-015-9350-y
- Higher heating value
- Pig manure