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High-solid pretreatment of rice straw at cold temperature using NaOH/Urea for enhanced enzymatic conversion and hydrogen production
- Dong, Lili, Cao, Guangli, Wu, Jiwen, Liu, Bingfeng, Xing, Defeng, Zhao, Lei, Zhou, Chunshuang, Feng, Liping, Ren, Nanqi
- Bioresource technology 2019 v.287 pp. 121399
- Fourier transform infrared spectroscopy, X-ray diffraction, cellulose, cold, crystal structure, fermentation, hydrogen, hydrogen production, hydrolysates, lignin, lignocellulose, reducing sugars, rice straw, sodium hydroxide, temperature, urea
- A high-solid loading pretreatment using NaOH/Urea solution at −12 °C was proposed to pretreat rice straw (RS) for enhanced saccharify and hydrogen production. Results shown NaOH/Urea pretreatment exhibited excellent pretreatment performance at solid loading ranged from 10% to 100% (w/v) with an average reducing sugar conversion of 80.22% was obtained which was 31.89% higher than that untreated RS. Upon fermentation of 100% solid loading pretreated hydrolysate, the H2 yield of 72.5 mL/g-pretreated RS was calculated based on substrate consumption, which enabled 49.5% higher reducing sugar transfer to H2 through material balance. FTIR and XRD analysis further demonstrated that the cold NaOH/Urea pretreatment at 100% (w/v) could effectively disrupt the lignin structure and decrease the cellulose crystallinity. The present study suggested a high solid loading pretreatment with NaOH/Urea at cold temperature could be a valuable alternative for better techno-economic of the lignocelluloses – to – sugars – to H2 routes.