Possible use of near infrared spectroscopy for management of the composting process

Thuriès Laurent, Bonnal Laurent, Davrieux Fabrice, Bastianelli Denis. 2007. Possible use of near infrared spectroscopy for management of the composting process. In : Near infrared spectroscopy : Proceedings of the 12th International Conference, Auckland, New Zealand, 9th - 15th April 2005. Burling-Claridge G.R. (ed.), Holroyd S.E. (ed.), Sumner R.M.W. (ed.). NIRCE. Chichester : IM Publications, 786-788. ISBN 978-0-473-11646-0|978-0-473-11746-7 International Conference on Near Infrared Spectroscopy. 12, Auckland, Nouvelle-Zélande, 9 Avril 2005/15 Avril 2005.

Résumé : Composting agro-food wastes according to industrial processes can provide organic fertilisers with known (and constant) quality levels. It is important for the user to know the degree of composting of an organic input, in order to better evaluate its potential beneficial effects on soil properties. For the industrial manufacturer, it is also important to control the quality of a compost during its elaboration. A key of success is to respect the major composting stage: the thermophilic phase. The challenge is to complete this phase without wasting any supplementary week of composting. The aim of this work was to explore the possibility of predicting by NIRS the composting degree. The parameter measured was the compost age, CA, in days. When starting a new compost pile, CA=0, and the duration of the phase is 60 days on average. Due to the heterogeneity of fresh compost samples, they were dried (40°C) and ground (<1 mm sieve) before being scanned on a NIRS 6500 (Foss NIRSystems) in ring cups. Spectra were corrected with SNVD 2,5,5 (WIN-ISI) mathematical pre-treatment and calibrations were performed using a multiple linear regression (MLR, WIN-ISI). The equation developed with 83 samples had a Standard Error of Calibration (SEC) of 9.3 d., a determination coefficient (R2) of 0.84, and a Standard Error of Cross Validation (SECV) of 9.9 d. The corresponding SD/SECV ratio (RPDcv) was 2.4. Calibration developed on a unique series of 22 samples (same pile, sampled regularly) gave a SEC of 6.0 d., a R2 of 0.96, and a SECV of 6.9. The corresponding RPDcv was 4.7. These very preliminary results show that it seems possible to assess the degree of composting, even if more efforts should be devoted to decrease the SECV to a more acceptable level (useful 4 d., ideal = 1 d.).

Mots-clés Agrovoc : compost, fertilisation, matière organique, spectrométrie

Classification Agris : Q70 - Traitement des déchets agricoles

Auteurs et affiliations

• Thuriès Laurent, CIRAD-CA-UPR Recyclage et risque (FRA) ORCID: 0000-0002-1365-7891
• Bonnal Laurent, CIRAD-EMVT-UPR Systèmes d'élevage (FRA) ORCID: 0000-0001-5038-7432
• Davrieux Fabrice, CIRAD-CP-UPR Qualité produits pérennes (FRA)
• Bastianelli Denis, CIRAD-EMVT-UPR Systèmes d'élevage (FRA) ORCID: 0000-0002-6394-5920

Source : Cirad - Agritrop (https://agritrop.cirad.fr/530995/)

Métriques

[ Page générée et mise en cache le 2024-03-24 ]