Effects of mechanical treatment of digestate after anaerobic digestion on the degree of degradation

Innovative pretreatment strategies for biogas production

“…The results showed that ball milling samples yield 46 % total carbohydrates and 72 % glucose as a result of the reduction in the cellulose crystallinity from 22 % to 13 %. Ball milling was also applied to nondegraded digestate in order to feed it back into the digestion process (Lindner et al, 2015). Enhanced methane production by 9 % was reported in the case of two-stage maize sillage digestate, and an increase of 17 % was detected when using two-stage hay/straw digestate.…”

Integration Approach of Anaerobic Digestion and Fermentation Process Towards Producing Biogas and Bioethanol with Zero Waste: Technical

“…The study has concluded that, mechanical pretreatment resulted in maximum to a triplication of the methane yield and to a quadruplicating of the daily methane yield. Also, no losses of VFAs through warming was observed [29]. Furthermore, biorefinery concept in which used for making a large variety of bioproducts is quite similar to current petroleum refinery.…”

Toward the complete utilization of rice straw: Methane fermentation and lignin recovery by a combinational process involving mechanical milling, supporting material and nanofiltration

“…Recently, a milling process requiring relatively low energy consumption (0.3-5.4 MJ/kg rice straw) has been exploited (Hideno et al, 2009;Sasaki et al, 2015). In addition, ball milling of a digestate of maize silage/hay/wheat straw provided an increased methane yield (Lindner et al, 2015). These findings suggest that mechanical milling can aid the efficient generation of biogas from the cellulose and hemicellulose in rice straw.…”

“…Mechanical pretreatment such as milling, grinding, or chipping is environmentally-friendly because chemicals such as acids, bases, or organic solvents are not required (Inoue et al, 2008;Lindner et al, 2015), but these process have the disadvantage of typically being energy intensive (Taherzadeh and Karimi, 2008;Hendriks and Zeeman, 2009;Alvira et al, 2010). Recently, a milling process requiring relatively low energy consumption (0.3-5.4 MJ/kg rice straw) has been exploited (Hideno et al, 2009;Sasaki et al, 2015).…”