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Sensors 2012, 12(2), 2340-2350; doi:10.3390/s120202340

NIR Monitoring of Ammonia in Anaerobic Digesters Using a Diffuse Reflectance Probe

Department of Engineering, Aarhus University, Blichers Allé 20, Tjele DK 8830, Denmark
Department of Food Science, Aarhus University, Kirstinebjergvej 10, Årslev DK 5792, Denmark
Author to whom correspondence should be addressed.
Received: 18 January 2012 / Revised: 16 February 2012 / Accepted: 16 February 2012 / Published: 21 February 2012
(This article belongs to the Section Chemical Sensors)
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The feasibility of using a diffuse reflectance probe attached to a near infrared spectrometer to monitor the total ammonia nitrogen (TAN) content in an anaerobic digester run on cattle manure was investigated; as a previous study has indicated that this probe can be easily attached to an anaerobic digester. Multivariate modelling techniques such as partial least squares regression and interval partial least squares methods were used to build models. Various data pre-treatments were applied to improve the models. The TAN concentrations measured were in the range of 1.5 to 5.5 g/L. An R2 of 0.91 with an RMSEP of 0.32 was obtained implying that the probe could be used for monitoring and screening purposes. View Full-Text
Keywords: NIRS; biogas; ammonia; inhibition; monitoring; manure; PLS; iPLS NIRS; biogas; ammonia; inhibition; monitoring; manure; PLS; iPLS

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Raju, C.S.; Løkke, M.M.; Sutaryo, S.; Ward, A.J.; Møller, H.B. NIR Monitoring of Ammonia in Anaerobic Digesters Using a Diffuse Reflectance Probe. Sensors 2012, 12, 2340-2350.

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