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Digestion anaérobie sur une ferme : évaluation du pouvoir méthanogène de substrats et étude de micropolluants

Abstract : The limitation of fossil energy resources and heavy environmental impacts arising from their operation, there is a renewed interest for anaerobic digestion. According to the energy, and health issues, the monitoring of an anaerobic digester involves the maximization of the methane production, but also to ensure a good quality of digestate from the perspective of micropollutants. It is within this framework that this project of thesis is realized in partnership with the experimental farm of “La Bouzule”. The optimization of the co-digestion of substrates, showed that the use of 36 weeks grass silage improved the process yield by 20%. The monitoring of heavy metals and PAHs content in the grasses from roadsides showed that these grasses – if used as co-substrate in the digester – will not affect the digestate quality. The study of the impact of antibiotics on methane production in batch reactor showed that: 8 mg/L and 16 mg/L of tetracycline led to 23% and 48% decrease respectively, 14 mg/L of spiramycin led to 40% decrease, and 20 mg/L tylosin to 30% decrease. The monitoring of the continuous reactor showed that low levels of tetracycline (0.2 mg/L and 2 mg/L) led to an improvement of about 5% of the methane production. At 200 mg/L and 2000 mg/L of tetracycline, reductions of 30% and 40% are achieved, and the system did not recover after 7 days. The addition of spiramycin to the continuous reactor at 1.4 mg/L, 14 mg/L and 140 mg/L resulted in decreases of 14%, 24% and 39% respectively. For the latter, after one week, a residual drop is still observable. Furthermore, the digestate resulting from the monitoring of the continuous reactor during the tests with antibiotics is in accordance with current regulations
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Billy Osborne Homeky. Digestion anaérobie sur une ferme : évaluation du pouvoir méthanogène de substrats et étude de micropolluants. Génie des procédés. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0346⟩. ⟨tel-01665490⟩

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