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Production of biogas (methane and hydrogen) from anaerobic digestion of hemicellulosic hydrolysate generated in the oxidative pretreatment of coffee husks.
- Source :
-
Bioresource Technology . Sep2018, Vol. 263, p601-612. 12p. - Publication Year :
- 2018
-
Abstract
- Ozone pretreatment of coffee husks (CH) was evaluated to generate hydrolysates for biogas production and to preserve cellulose of the solid phase for 2G ethanol production. Pretreatment variables included liquid-to-solid ratio ( LSR ), pH and specific applied ozone load ( SAOL ). Considering single-stage anaerobic digestion (AD), the highest methane production (36 NmL CH 4 /g CH) was achieved with the hydrolysate generated in the experiment using LSR 10 mL/g, pH 11 and SAOL 18.5 mg O 3 /g CH, leading to 0.064 kJ/g CH energy recovery. Due to the presence of toxic compounds in the hydrolysate, the addition of powdered activated carbon (4 g/L) to the reactor enhanced biogas production, leading to 86 NmL CH 4 /g CH yield and 0.58 kJ/g CH energy recovery. When two-stage AD was applied, methane production resulted in 49 NmL CH 4 /g CH, with additional 19 NmL H 2 /g CH production, resulting in a net 0.26 kJ/g CH energy recovery. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09608524
- Volume :
- 263
- Database :
- Academic Search Index
- Journal :
- Bioresource Technology
- Publication Type :
- Academic Journal
- Accession number :
- 130838064
- Full Text :
- https://doi.org/10.1016/j.biortech.2018.05.037