The effect of process parameters during the thermal-expansionary pretreatment of wheat straw on hydrolysate quality and on biogas yield

Effect of enzymatic pretreatment of various lignocellulosic substrates on production of phenolic compounds and biomethane potential

“…Known methods for improving the hydrolysis step are acidic, mechanical, thermal and biological pretreatments (Pilli et al, 2014;Li et al, 2015). Acidic, mechanical and thermal pretreatments have been shown effective on lignin degradation, however these techniques are more costly and result in a higher production of inhibitory compounds such as p-coumaric acid and 4-hydroxybenzoic acid Kratky and Jirout, 2015). Biological pretreatments using white rot fungi to breakdown lignin by producing enzymes such as laccase or versatile peroxidase can be a cheap alternative to improve the hydrolysis step, and prohibit the formation of high concentrations of inhibiting compounds (Dong et al, 2013).…”

Energy‐Economic Analysis of Thermal‐Expansionary Pretreatment for Its Implementation at a Biogas Plant

“…The highest yield for the biogas was (633±52) Nm 3 t −1 TS , and for methane it was (362±43) Nm 3 t −1 TS 10. This is a 50 % higher methane concentration than that during degradation of untreated straw, which was (243±49) Nm 3 t −1 TS 9. The residence time in the digester was around 40 days.…”

“…Wheat straw was used as the model substrate 9, 10. The aqueous suspension had 5 wt % total solids (TS) of wheat straw.…”

“…3 is an illustration of the post‐processing of wheat straw, so that all together they create a flowsheet of the intensified biogas production. The flowsheet was constructed based on the literature 9, 10, and also on technological understanding of conventional biogas plant principles 4. The flowsheet here was adapted for 5 wt % TS of substrate in an aqueous batch 9, 10.…”

“…The flowsheet was constructed based on the literature 9, 10, and also on technological understanding of conventional biogas plant principles 4. The flowsheet here was adapted for 5 wt % TS of substrate in an aqueous batch 9, 10. So, the loading was 1.2 kg TS m −3 d −1 .…”