Characterization and prediction of organic nitrogen biodegradability during anaerobic digestion: A bioaccessibility approach

Abstract : 13 Prediction of organic nitrogen mineralization into ammonium during anaerobic digestion is required 14 for optimizing substitution of mineral fertilizer by digestates. The aim of this study was to understand 15 organic nitrogen biodegradability and to investigate how it can be predicted from carbon 16 biodegradability, and nitrogen bioaccessibility, respectively. Bioaccessibility was assessed using 17 fractionation methods based on sequential extractions. Results showed that organic nitrogen was 18 present in fractions whose bioaccessibility levels differed. Organic nitrogen and carbon 19 biodegradability were also determined and compared. Results highlighted two groups of substrates: 20 the first with an initial NH 4 + /TKN<30%, whose carbon and nitrogen biodegradability are similar; the 21 second with an initial NH 4 + /TKN>30%, whose carbon and nitrogen biodegradability differ 22 significantly. To enable prediction on all substrates, partial least square (PLS) regressions were carried 23 out to link organic nitrogen bioaccessibility indicators to biodegradability. The models successfully 24 predicted organic nitrogen biodegradability with a maximum prediction error of 10%.
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Y. Bareha, R. Girault, J. Jimenez, A. Trémier. Characterization and prediction of organic nitrogen biodegradability during anaerobic digestion: A bioaccessibility approach. Bioresource Technology, Elsevier, 2018, 263, pp.425 - 436. ⟨10.1016/j.biortech.2018.04.085⟩. ⟨hal-01829450⟩

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