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Optimization of biogas production from coffee production waste

Author:
Battista, Federico   Fino, Debora   Mancini, Giuseppe  


Journal:
Bioresource Technology


Issue Date:
2016


Abstract(summary):

Highlights

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%.

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 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.



Page:
884-890


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