6th International Conference on Renewable Fuels, Combustion and Fire (FCE`17), Nevşehir, Turkey, 18 - 21 May 2017, vol.6, pp.1
In this study, anaerobic co-digestion of waste coffee and sewage sludge was used for the production of biogas in a batch scale digester at mesophilic condition (~37 °C). Three experimental conditions were prepared including; sewage sludge (sample 1) which had 2% of solid waste, sewage sludge with waste coffee before oil extraction (sample 2), and sewage sludge with waste coffee after oil extraction (sample 3). 5 grams of waste coffee (before and after oil extraction) were mixed with 100 ml of sewage sludge, the experiments were monitored for 45 days. The results showed that sewage sludge gave the lowest methane yield (0.003 m3/kg VS initial) while the highest was obtained from sample 2 (0.02 m3/kg VS initial) compared to (0.007 m3/kg VS initial) of sample 3. As a conclusion, co-digestion of waste coffee as potential co-substrate is an effective method to enhance biogas yield from sewage sludge. Therefore, more research shall be directed towards the recycling of waste coffee into biogas.
Keywords: Biogas, Recycling, Co-digestion, Coffee waste, Sewage sludge.