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Mitigation of the inhibitory effect of soap by magnesium salt treatment of crude glycerol – A novel approach for enhanced biohydrogen production from the biodiesel industry waste.

Sarma, Saurabh Jyoti; Brar, Satinder Kaur; Le Bihan, Yann; Buelna, Gerardo; Soccol, Carlos Ricardo (2014). Mitigation of the inhibitory effect of soap by magnesium salt treatment of crude glycerol – A novel approach for enhanced biohydrogen production from the biodiesel industry waste. Bioresource Technology , vol. 151 . p. 49-53. DOI: 10.1016/j.biortech.2013.10.042.

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Résumé

Owing to its inhibitory effect on microbial growth, soap present in crude glycerol (CG) is a concern in biological valorization of the biodiesel manufacturing waste. By salting out strategy, up to 42% of the soap has been removed and the approach has beneficial effect on H₂ production; however, removal of more than 7% of the soap was found to be inhibitory. Actually, soap is utilized as a co-substrate and due to removal; the carbon–nitrogen ratio of the medium might have decreased to reduce the production. Alternatively, without changing the carbon–nitrogen ratio of CG, MgSO₄ treatment can convert the soap to its inactive form (scum). The approach was found to increase the H₂ production rate (33.82%), cumulative H₂ production (34.70%) as well as glycerol utilization (nearly 2.5-folds). Additionally, the treatment can increase the Mg (a nutrient) content of the medium from 0.57 ppm to 201.92 ppm.

Type de document: Article
Mots-clés libres: biodiesel; biohydrogen; crude glycerol; impurity; Soap
Centre: Centre Eau Terre Environnement
Date de dépôt: 11 avr. 2018 18:06
Dernière modification: 11 avr. 2018 18:06
URI: http://espace.inrs.ca/id/eprint/3679

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