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The ligno-cellulosic materials in coffee wastes inhibits the biogas production.
NaOH permits the hydrolysis of coffee wastes and a high biogas production.
A scaled-up of the basic pretreatment in continuous mode was realized.
The continuous test reached a good yield of the process: 82%.
The daily biogas production was of 1.14 NL/L d with a methane content of 65%.
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 18 NL/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 45 L anaerobic reactor working in continuous mode and in a mesophilic condition (35 °C) with a Hydraulic Retention Time (HRT) of about 40 days. A high biogas production of 1.14 NL/L d, with a methane percentage of 65% v/v was obtained, thus permitting a process yield of about 83% to be obtained.
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