Modeling the fate of organic nitrogen during anaerobic digestion: Development of a bioaccessibility based ADM1. (1st May 2019)

• Record Type: Journal Article
• Authors: Bareha, Y.; Girault, R.; Guezel, S.; Chaker, J.; Trémier, A.
• Is Part Of: Water research. Volume 154(2019)
• Page Start: 298
• Page End: 315
• Publication Date: 2019-05-01
• Subjects: Anaerobic digestion -- Nitrogen -- Modeling -- ADM1 -- Bioaccessibility; Water -- Pollution -- Research -- Periodicals; 363.7394
• DOI: 10.1016/j.watres.2019.02.011
• Languages: English
• ISSNs: 0043-1354

Abstract

Abstract: Simulating the fate of nitrogen during anaerobic digestion is required to predict the characteristics of digestates and to improve their exploitation for agricultural uses. The aim of this study was to develop a modified ADM1 model that includes bioaccessibility-based fractionation to accurately simulate the fate of nitrogen during anaerobic digestion. To this end, two complementary approaches were used: (i) changes in the bioaccessibility of protein and non-protein compounds were assessed on eight substrates during anaerobic digestion in batch experiments using the "EPS" fractionation method; (ii) experimental results were used to develop a bio-kinetic model based on anaerobic digestion model n°1. This new model incorporates bioaccessibility-based fractionation in its input state variables. The model was successfully calibrated and model evaluation showed that predicted methane production, ammonium production and changes in protein and non-protein bioaccessibility during anaerobic digestion were accurate. Highlights: NH4 + production is strongly limited by the bioaccessibility of complex compounds. A bioaccessibility-based fractionation is included in ADM1 input state variables. Model calibration allows accurate simulation of CH4 and NH4 + production. Bioaccessibility of digestate compounds is correctly predicted. Substrate typology eliminates the need for specific calibration of hydrolysis kinetics.