scholarly journals On-line near infrared monitoring of glycerol-boosted anaerobic digestion processes: Evaluation of process analytical technologies

2007 ◽  
Vol 99 (2) ◽  
pp. 302-313 ◽  
Author(s):  
Jens Bo Holm-Nielsen ◽  
Carina Juel Lomborg ◽  
Piotr Oleskowicz-Popiel ◽  
Kim H. Esbensen
Keyword(s):  
Anaerobic Digestion ◽  
Near Infrared ◽  
On Line ◽  
Infrared Monitoring

On-Line near Infrared Monitoring of Ammonium and Dry Matter in Bioslurry for Robust Biogas Production: A Full-Scale Feasibility Study

2012 ◽  
Vol 20 (6) ◽  
pp. 635-645 ◽  
Author(s):  
Michael Madsen ◽  
Felicia N. Ihunegbo ◽  
Jens Bo Holm-Nielsen ◽  
Maths Halstensen ◽  
Kim H. Esbensen
Keyword(s):  
Feasibility Study ◽  
Dry Matter ◽  
Near Infrared ◽  
Biogas Production ◽  
Full Scale ◽  
On Line ◽  
Infrared Monitoring

Transflexive Embedded near Infrared Monitoring for Key Process Intermediates in Anaerobic Digestion/Biogas Production

2007 ◽  
Vol 15 (2) ◽  
pp. 123-135 ◽  
Author(s):  
Jens Bo Holm-Nielsen ◽  
Helga Andree ◽  
Harald Lindorfer ◽  
Kim H. Esbensen
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Volatile Fatty Acids ◽  
Method Development ◽  
Near Infrared ◽  
Anaerobic Fermentation ◽  
Biogas Production ◽  
Total Volatile ◽  
Bulk Volume ◽  
Infrared Monitoring

This work reports an off-line method development simulating at-line anaerobic co-digestion process monitoring using a new transflexive embedded near infrared sensor (TENIRS) system as a process analytical chemistry (PAC) facility. The operative focus is on optimising anaerobic digestion biogas production with energy crops as the main feedstock. Results show that several key monitoring intermediates in the anaerobic fermentation process can be quantified directly using near infrared spectroscopy with good results, especially ammonium and total volatile fatty acids. Good feasibility study prediction validations have been obtained for total solids (TS), volatile solids (VS), ammonium, acetic acid and total volatile fatty acids. The TENIRS system is a new option for real-time, at-line/on-line monitoring of biogas fermentation operations, offering a robust, low-budget PAC approach to a rapidly growing bulk volume industry.

Modelling near-infrared signals for on-line monitoring in cheese manufacture

2002 ◽  
Vol 16 (2) ◽  
pp. 89-98 ◽  
Author(s):  
B. J. A. Mertens ◽  
C. P. O'Donnell ◽  
D. J. O'Callaghan
Keyword(s):  
Near Infrared ◽  
On Line

Water absorption thermodynamics in single wood pellets modelled by multivariate near-infrared spectroscopy

Holzforschung ◽  
2008 ◽  
Vol 62 (4) ◽  
Author(s):  
Torbjörn A. Lestander
Keyword(s):  
Water Content ◽  
Near Infrared ◽  
Calorific Value ◽  
Least Squares Regression ◽  
Wood Pellets ◽  
Differential Heat ◽  
On Line ◽  
Explained Variation ◽  
Test Sets ◽  
Content Range

Abstract Samples of wood pellets were adjusted into six water content classes from 0% to 12%. The water content in single pellets varied between 0.1% and 14.2%. Three equations were constructed to estimate the differential heat of sorption (-ΔH) values from (1) fractal-geometry, (2) isosteric, and (3) calorimetric data. The ranges in calculated -ΔH of single pellets were (1) 133–1475, (2) 315–881, and (3) 195–1188 J g-1 water, respectively, across the studied moisture content range. Partial least squares regression was used to model near-infrared (NIR) spectra from single pellets and to predict -ΔH values and water content. The explained variation in test sets for the different models ranged from 97.1% to 99.9%. The shifts in peak absorbance for two water bands indicated that frequency in overtone vibration of O-H stretching and bending decreased, when water content was raised. Simulations of mixes between pellets of differential heat values showed that released heat was up to 0.03% of the gross calorific value of wood pellets. This heat may be a major contributor to initial temperature increases in pellet stacks during storage. The results indicate that on-line NIR based predictions of differential heat in wood pellets is possible to apply in the pellet industry.

scholarly journals Optimum three-point linkage set up for improving the quality of soil spectra and the accuracy of soil phosphorus measured using an on-line visible and near infrared sensor

2009 ◽  
Vol 103 (1) ◽  
pp. 144-152 ◽  
Author(s):  
A.M. Mouazen ◽  
M.R. Maleki ◽  
L. Cockx ◽  
M. Van Meirvenne ◽  
L.H.J. Van Holm ◽  
...  
Keyword(s):  
Near Infrared ◽  
Soil Phosphorus ◽  
Infrared Sensor ◽  
On Line ◽  
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