Biomethanization of orange peel waste
2010
Martín, M.A. | Siles, J.A. | Chica, A.F. | Martin, A.
Recent research has demonstrated that orange peel waste is a potentially valuable resource that can be developed into high value products such as methane. Following a pre-treatment to extract d-limonene, the anaerobic digestion of orange peel waste was evaluated at laboratory and pilot scale under mesophilic and thermophilic conditions. d-Limonene removals of 70% were reached with pre-treatment. The results showed the convenience of thermophilic conditions for treating this waste as the methane production rate and biodegradability were higher than at mesophilic temperature. At pilot scale, a thermophilic continuously stirred-tank reactor working in semi-continuous mode was employed. The OLR was found to be in the range of 1.20-3.67kgCOD/m³ d; the most appropriate range for working under stable conditions at SRT of 25d. The methane yield coefficient was found to be 0.27-0.29LSTP CH₄/g added COD and the biodegradability 84-90% under these conditions. However, acidification occurred at the highest OLR.
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