Strategies for the sustainable management of orange peel waste through anaerobic digestion. (15th April 2018)

• Record Type: Journal Article
• Authors: Calabrò, P.S.; Paone, E.; Komilis, D.
• Is Part Of: Journal of environmental management. Volume 212(2018)
• Page Start: 462
• Page End: 468
• Publication Date: 2018-04-15
• Subjects: Ensiling -- Limonene -- Mesophilic -- Orange peel waste -- Pretreatment; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2018.02.039
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: The processing of oranges is a major industry worldwide and leads to the production of large amounts of orange peel waste (OPW). Energy production through anaerobic digestion of OPW is a promising option; however, the high content of essential oil, mainly composed ofd -limonene, a well-known antioxidant, can cause the inhibition of the biological activity. In this paper, different pretreatment methods were tested (e.g. ensiling, aeration, thermal and alkaline treatments) to optimize the anaerobic digestion of OPW focusing ond -limonene removal. The raw and pretreated substrates were characterized and their biochemical methane production was measured. The results demonstrated the ability of some of the treatments to reduced -limonene content up to 80%. A relatively high biomethane potential production of OPW (up to about 500 NmL CH4 g −1 VS) was measured. The importance of the acclimation of inoculum and the risk connected to the accumulation of inhibiting substances in the reactor is discussed. Highlights: Four pretreatment techniques were applied on orange peel waste (OPW). Factorial design principles and kinetic modeling were used. Pretreatment achieved the removal ofd -limonene by up to 80%. Microbial acclimation tod -limonene was a key factor during digestion. Inoculum type affected the process more than the pretreatment techniques.