Ibrahim Dinçer, Can Özgür Çolpan, Önder Kızılkan, Canan Acar, Halil Sadi Hamut, Mehmet Akif Ezan, Ahmet Özbilen
Abstract
Coffee is one of the most cultivated plant and the one of the most produced beverage in the world. The
wastes derived from its production as Coffee Seed Skin (CSS), Send Refuse (SR) and Coffee Product
Refuse (CPR) present a high content of organic matter. AD represents the best technology to treat these
wastes in order to obtain a stabilized sludge and, mainly, a biogas rich in methane. This work concerns on
the experimental tests on coffee production refuses. They were crushed and mixed with tap water till to
obtain the dispersion with a Total Solids (TS) concentration of about 10% w/w. The mixture was carried out
in 45 L anaerobic reactor working in continuous mode and in mesophilic condition (38 °C) with a hydraulic
retention time (HRT) of about 40 days. A biogas production of 0.7 L/L•day with a methane percentage of
65% v/v was obtained. It corresponds to a specific methane production of 820 L CH4/ kg ΔVS
