High conversion of sugarcane bagasse into monosaccharides based on sodium hydroxide pretreatment at low water consumption and wastewater generation

• DOI: 10.1016/j.biortech.2016.07.074
• Publication Date: 2016-07-22T02:29:04Z
• Authors: Wen Wang; Qiong Wang; Xuesong Tan; Wei Qi; Qiang Yu; Guixiong Zhou; Xinshu Zhuang; Zhenhong Yuan
• Keywords: Technology; SWEET SORGHUM BAGASSE; Energy & Fuels; 0211 other engineering and technologies; 02 engineering and technology; ENZYMATIC-HYDROLYSIS; Alkalies; Wastewater; 7. Clean energy; 333; LIQUID HOT-WATER; 12. Responsible consumption; LIGNOCELLULOSIC BIOMASS; Waste Management; SACCHARIFICATION; Sodium Hydroxide; Recycling; Recycle; Cellulose; Alkaline Pretreatment; Science & Technology; Ethanol; Hydrolysis; Monosaccharides; Agriculture; 600; Sugarcane Bagasse; 6. Clean water; Saccharum; Biotechnology & Applied Microbiology; 13. Climate action; Fermentation; DELIGNIFICATION; TECHNOLOGIES; Black Liquor; Agricultural Engineering; Life Sciences & Biomedicine; LIGNIN

The generation of a great quantity of black liquor (BL) and waste wash water (WWW) has been key problems of the alkaline pretreatment. This work tried to build a sustainable way to recycle the BL for pretreating sugarcane bagasse (SCB) and the WWW for washing the residual solid (RS) of alkali-treated SCB which would be subsequently hydrolysed and fermented. The enzymatic hydrolysis efficiency of the washed RS decreased with the recycling times of BL and WWW increasing. Tween80 at the loading of 0.25% (V/V) could notably improve the enzymatic hydrolysis and had no negative impact on the downstream fermentation. Compared with the non-recycling and BL recycling ways based on alkaline pretreatment, the BL-WWW recycling way could not only maintain high conversion of carbohydrate into monosaccharides and save alkali amount of 45.5%, but also save more than 80% water and generate less than 15% waste water.