Potassium Hydroxyde Pre-Treatment Enhances Methane Yield from Giant Reed (Arundo donax L.)

Energies

卷:14

Stefano Cianchetta¹  Enrico Ceotto¹  Stefania Galletti¹  Rosa Marchetti²  Ciro Vasmara² 

[1] CREA–Council for Agricultural Research and Economics, Research Centre for Agriculture and Environment, Via di Corticella 133, 40128 Bologna, Italy;

[2] CREA–Council for Agricultural Research and Economics, Research Centre for Animal production and Aquaculture, Via Beccastecca 345, 41018 San Cesario Sul Panaro, Italy;

关键词: alkaline pre-treatment;    anaerobic digestion;    Arundo donax L.;    biogas;    giant reed;    lignocellulosic biomass;   

DOI  :  10.3390/en14030630

来源: DOAJ

【 摘 要 】

The biogas production through the anaerobic digestion (AD) of giant reed (Arundo donax L.) biomass has received increasing attention. However, due to the presence of lignin, a low CH₄ yield can be obtained. Aiming to improve the CH₄ yield from giant reed biomass, the effectiveness of a thermo-chemical pre-treatment based on KOH was evaluated in this paper. The usefulness of a washing step before the AD was also assessed. The pre-treatment led to a specific CH₄ yield up to 232 mL CH₄ g⁻¹ VS which was 21% higher than that from untreated biomass; the maximum daily rate of production was improved by 42%, AD duration was reduced by 10%, and CH₄ concentration in the biogas was increased by 23%. On the contrary, the washing step did not improve the AD process. Besides, washing away the liquid fraction led to biomass losses, reducing the overall CH₄ production. The use of a KOH-based pre-treatment appears as a good option for enhancing the AD of giant reed, also presenting potential environmental and agronomical benefits, like the avoidance of salty wastewater production and the likely improvement of the digestate quality, due to its enriched K content.

【 授权许可】

Unknown