title: Optimization of biogas production from coffee production waste.
abstract: This study was conducted to investigate the effects of chemical pretreatments on biogas production from coffee waste. After the preparation of a mixture of coffee waste with a TS concentration of 10%w/w, basic and acid pretreatments were conducted in batch mode and their performances were compared with the biogas produced from a mixture without any pretreatment stage. The basic pretreatment demonstrated a very good action on the hydrolysis of the lignin and cellulose, and permitted a biogas production of about 18NL/L with a methane content of almost 80%v/v. Thus, the basic pretreatment has been used to scale-up the process. The coffee refuse was has been carried out in a 45L anaerobic reactor working in continuous mode and in a mesophilic condition (35°C) with a Hydraulic Retention Time (HRT) of about 40days. A high biogas production of 1.14NL/Ld, with a methane percentage of 65%v/v was obtained, thus permitting a process yield of about 83% to be obtained.
authors.affiliation: Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy. Electronic address: federico.battista@polito.it.
authors.forename: Federico
authors.initials: F
authors.lastname: Battista
authors.affiliation: Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy.
authors.forename: Debora
authors.initials: D
authors.lastname: Fino
authors.affiliation: Department of Industrial Engineering, University of Catania, Viale A. Doria 6, Catania 95125, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Mancini
mesh_terms: D000468:Alkalies / Q000737:chemistry; D000693:Anaerobiosis; D061249:Batch Cell Culture Techniques; D056804:Biofuels; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D003069:Coffee / Q000737:chemistry*; D005232:Fatty Acids, Volatile / Q000032:analysis; D006868:Hydrolysis; D008697:Methane / Q000096:biosynthesis; D012639:Seeds / Q000737:chemistry; D013997:Time Factors; D014866:Waste Products
chemical_list: D000468:Alkalies; D056804:Biofuels; D003069:Coffee; D005232:Fatty Acids, Volatile; D014866:Waste Products; D008697:Methane
keywords: Anaerobic Digestion; Batch and continuous mode; Coffee production residues; Pretreatments; Volatile Fatty Acids influence