Supercritical carbon dioxide enhanced pre-treatment of cotton stalks for methane production

Cotton stalks (CSs) are an abundant, renewable lignocellulose residue, which is usually burnt in the field to prevent propagation of vegetal diseases, causing economic losses and environmental concerns. The production of biogas has been considered as an alternative. This work aimed to improve the biogas production from CS by steam or organosolv plus supercritical carbon dioxide (scCO(2)) pre-treatment. All samples were pre-treated in a 500 mL autoclave for 140 min at 180 degrees C and fermented in 1 L eudiometer batch digesters for 42 days at 37.5 degrees C. The biogas and methane yields achieved from the untreated CS were 250 and 137 norm litres per kg of volatile solid (L-N kg(-1) VS), respectively. Pre-treatment of the CS samples with steam or the organosolv plus scCO(2) process increased the methane yield by 20% compared to the untreated samples. The highest methane yield of 177 L-N kg(-1) VS was achieved by organosolv plus scCO(2) pre-treatment at 100 bar and 180 degrees C for 140 min. Moreover, pre-treatment of the CS led to a significant reduction in the optimal digestion time from 30 days to 20 days for biogas production for the untreated CS. (C) 2020 Elsevier Ltd. All rights reserved.