| Title | Variability of food waste chemical composition: Impact of thermal pretreatment on lignocellulosic matrix and anaerobic biodegradability |
| Abstract | A comprehensive sustainable Food Waste (FW) management is globally needed in order to reduce the environmental
pollution and the financial costs due to FW disposal; anaerobic digestion is considered as one of the
best environmental-friendly alternatives to this aim. A deep investigation of the chemical composition of different
Food waste types (cooked kitchen waste (CKW), fruit and vegetable scraps (FVS) and organic fraction of
municipal solid waste (OFMSW)) is here reported, in order to evaluate their relevant substance-specific properties
and their impact on anaerobic biodegradability by means of a sophisticated automatic batch test system.
Suitability for a mild thermal pre-treatment (T=134 °C and p=3.2 bar) to enhance the biological degradation
of hardly accessible compounds was investigated. The pre-treatment affected significantly the carbohydrates
solubilisation, and was able in reducing part of the lignocellulosic matrix. Moreover, in mesophilic conditions,
the high solubilized sugars content favoured the initial recovery of hydrogen (not consumed by hydrogenotrophic
methanogenesis), allowing to newly assess the extent of prompt fermentability. Pre-treatment enhanced
hydrogen yields of FVS and OFMSW, with gains up to +50%, while the successive methane production,
occurring in the same reactor, resulted affected by the lack of the soluble part of carbohydrates, "subtracted" for
H2 production. Only in thermophilic conditions, when no hydrogen in the biogas was detected, pre-treatment of
OFMSW significantly increased methane yield (from 0.343 to 0.389 L CH4 g-1 VSfed). A thermal pre-treatment
seems the recommended solution in order to reduce part of the recalcitrant lignocellulosic matrix of food waste,
to improve energy recovery and to eliminate the extra cost needed for pasteurization. |
| Source | Journal of environmental management 236, pp. 100–107 |
| Keywords | Food wasteLignocellulosic matrixThermal pre-treatmentMethane potentialFermentabilityHydrogen |
| Journal | Journal of environmental management |
| Editor | Academic Press., New York, Regno Unito |
| Year | 2019 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.jenvman.2019.01.084 |
| Authors | Pagliaccia, P., Gallipoli, A., Gianico, A., Gironi, F., Montecchio, D., Pastore, C., Di Bitonto, L., Braguglia, C.M. |
| Text | 399580 2019 10.1016/j.jenvman.2019.01.084 Scopus 2 s2.0 85061316120 ISI Web of Science WOS WOS 000461410000011 Food waste Lignocellulosic matrix Thermal pre treatment Methane potential Fermentability Hydrogen Variability of food waste chemical composition Impact of thermal pretreatment on lignocellulosic matrix and anaerobic biodegradability Pagliaccia, P., Gallipoli, A., Gianico, A., Gironi, F., Montecchio, D., Pastore, C., Di Bitonto, L., Braguglia, C.M. Water Research Institute IRSA , National Research Council CNR , Strada Provinciale 35d, km 0.7, 00010, Montelibretti, Rome, Italy Dipartimento di Ingegneria Chimica, Universita degli Studi di Roma La Sapienza , Via Eudossiana 18, 00184, Rome, Italy Water Research Institute IRSA , National Research Council CNR , Via F. de Blasio 5, 70132, Bari, Italy A comprehensive sustainable Food Waste FW management is globally needed in order to reduce the environmental pollution and the financial costs due to FW disposal; anaerobic digestion is considered as one of the best environmental friendly alternatives to this aim. A deep investigation of the chemical composition of different Food waste types cooked kitchen waste CKW , fruit and vegetable scraps FVS and organic fraction of municipal solid waste OFMSW is here reported, in order to evaluate their relevant substance specific properties and their impact on anaerobic biodegradability by means of a sophisticated automatic batch test system. Suitability for a mild thermal pre treatment T=134 °C and p=3.2 bar to enhance the biological degradation of hardly accessible compounds was investigated. The pre treatment affected significantly the carbohydrates solubilisation, and was able in reducing part of the lignocellulosic matrix. Moreover, in mesophilic conditions, the high solubilized sugars content favoured the initial recovery of hydrogen not consumed by hydrogenotrophic methanogenesis , allowing to newly assess the extent of prompt fermentability. Pre treatment enhanced hydrogen yields of FVS and OFMSW, with gains up to 50%, while the successive methane production, occurring in the same reactor, resulted affected by the lack of the soluble part of carbohydrates, subtracted for H2 production. Only in thermophilic conditions, when no hydrogen in the biogas was detected, pre treatment of OFMSW significantly increased methane yield from 0.343 to 0.389 L CH4 g 1 VSfed . A thermal pre treatment seems the recommended solution in order to reduce part of the recalcitrant lignocellulosic matrix of food waste, to improve energy recovery and to eliminate the extra cost needed for pasteurization. 236 Published version https //doi.org/10.1016/j.jenvman.2019.01.084 Variability of food waste chemical composition Impact of thermal pretreatment on lignocellulosic matrix and anaerobic biodegradability Manuscript 2019 Variability of food waste Jema.pdf Articolo in rivista Academic Press. 0301 4797 Journal of environmental management Journal of environmental management J. environ. manag. PAGLIACCIA PAMELA DI BITONTO LUIGI camillamaria.braguglia BRAGUGLIA CAMILLA MARIA andrea.gianico GIANICO ANDREA carlo.pastore PASTORE CARLO daniele.montecchio MONTECCHIO DANIELE agata.gallipoli GALLIPOLI AGATA |
