Dilute acid pretreatment and fermentation of sugar beet pulp to ethanol

Effects of pretreatment conditions and post–pretreatment washing on ethanol production from dilute acid pretreated rice straw

“…The methods used for pretreatment, enzymatic hydrolysis and SSF were similar to the methods in our previous work (Zheng et al, 2013). Dilute acid pretreatment was performed in a 1-l reactor (Carpenter 20 Cb-3, Parr Co., Moline, IL, USA), equipped with an impeller mixer.…”

“…Rice straw used in SSF was pretreated at 160 C and 1% H 2 SO 4 . Procedures for SSF were adapted from National Renewable Energy Laboratory (NREL) laboratory analytical procedures (Dowe & McMillan, 2001) and prior studies (Zheng et al, 2013). Samples were fermented using E. coli KO11 and S. cerevisiae D 5 A.…”

“…There are methods to eliminate such inhibitors after pretreatment and prior to fermentation. Extensive washing is sometimes included to remove inhibitors, although sugars may be extracted as well (Rajan & Carrier, 2014;Zheng et al, 2013). It could be more economical to integrate the liquid fraction from the pretreatment step into fermentation; however it would be necessary to account for both the amount of sugars and inhibitors solubilised, in addition to understanding the composition of the pretreated solid fraction.…”

Production of saccharides from sugar beet pulp by ultrafast hydrolysis in supercritical water

“…The goal of the pretreatment 287 was to solubilize hemicellulose and make residual cellulose more degradable by enzymes 288 (Zheng et al, 2013). The authors of that previous work obtained a liquid rich in C-5 sugars 289 (arabinose recovery was up to 68 % w/w) and the 5-HMF yield was around 10 % w/w after 290 acid pretreatment.…”

Two-step sequential pretreatment for the enhanced enzymatic hydrolysis of coffee spent waste

“…Spent coffee waste (1% w/v) was mixed with 10 ml of different concentrations of sulphuric acid (1%, 1.3% and 1.6%) in a 100 ml flask. The reaction mixture was subjected to 121°C for different reaction times (10, 20 and 30 min) (Zheng et al, 2013). After pretreatment the solids were separated from liquids by centrifugation at 8000 rpm for 12 min and the supernatant was analysed for total and individual sugars and by-products such as acetic acid, furfural and hydroxymethyl furfural.…”