Identification and assay of microbial fatty acids during co-composting of active sewage sludge with palm waste by TMAH-thermochemolysis coupled with GC-MS - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Chemistry and Ecology Année : 2015

Identification and assay of microbial fatty acids during co-composting of active sewage sludge with palm waste by TMAH-thermochemolysis coupled with GC-MS

Résumé

The fatty acids of two composts of active sludge with palm tree waste were investigated by thermochemolysis coupled to gas chromatography-mass spectrometry. This method (tetramethylammonium hydroxide-pyrolysis-gas chromatography-mass spectrometry) allowed the direct determination of total fatty acids (analysed as fatty acid methyl esters: FAMEs) present in the organic matter of the samples without any separation procedures. Mixture A was 1/3 sludge + 2/3 palm waste and mixture B was 1/2 sludge + 1/2 palm waste. The level of FAMEs rose by 8.4-33.3% and 10.8-13.4% in mixtures A and B, respectively, after 6 months of co-composting. Branched FAMEs of bacterial origin (iC15:0) rose during the thermophilic phase, in mixtureA the aC17:0/aC15:0 ratio increased during the co-composting process, also in mixture B the aC16:0/C16:0 ratio rose but only during the thermophilic phase. All the FAMEs identified showed a drop at the end of co-composting except for C18:0 and C16:0. The stabilisation phase was characterised by a significant rise in the length of the aliphatic chains; the carbon preference index thus increased at the end of the composting process, indicating that the final product was proportionally richer in fatty acids of plant origin.
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hal-01054345 , version 1 (06-08-2014)

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Loubna El Fels, Fatima Zahra El Ouaqoudi, Laurent Lemée, P. Winterton, Georges Merlina, et al.. Identification and assay of microbial fatty acids during co-composting of active sewage sludge with palm waste by TMAH-thermochemolysis coupled with GC-MS. Chemistry and Ecology, 2015, 31 (1), pp.64-76. ⟨10.1080/02757540.2014.932782⟩. ⟨hal-01054345⟩
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