文献类型：期刊文献

英文题名：Integrated Biorefinery of Harmful Algae Bloom (Enteromorpha Prolifera) for Polysaccharide and Crude Bio-Oil Production

作者：Wu, Yijing[1,2]; Xu, Xin[1]; Jiang, Xuanjing[2]; Lin, Jingying[1]; Lin, Xiaoyu[1]; Zhao, Shicheng[3]; Yang, Jie[1]

机构：[1] Institute of Oceanography, College of Geography and Oceanography, Minjiang University, Fuzhou, 350108, China; [2] College of Oceanology and Food Science, Quanzhou Normal University, Quanzhou, 362000, China; [3] School of Chemical Engineering, East China University of Science & Technology, Shanghai, 200237, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220062667)

语种：英文

外文关键词：Algae - Bioconversion - Calorific value - Curve fitting - Liquefaction - Refining

摘要：The excessive growth of Enteromorpha prolifera (EP) could lead to the harmful algae bloom, making the disposal of EP (millions of tons) an inevitable problem. Although some attempts have been made to valorize EP, the development of integrated biorefinery for EP valorization is still lacking. This study aimed to extract water-soluble polysaccharide from EP, following by utilizing an emerging thermochemical technique (hydrothermal liquefaction, HTL) to generate crude bio-oil from residual EP. 2 k factorial design along with replicated center points were conducted to evaluate the necessity of using response surface methodology (RSM) to optimize polysaccharide extraction conditions, of which almost all RSM related studies did not test the significance of curvature effect before employing RSM. The curvature effect was identified to be temperature*temperature in this study, and the interaction effects (solid/water ratio*time & temperature*time) were also crucial for EP polysaccharide extraction. The maximal polysaccharide yield of 12.1 wt.% could be achieved under the optimal conditions (1:55 g/mL solid/water ratio, 70 °C, 60 min). The polysaccharide solution acquired under the optimal conditions exhibited satisfactory antioxidant activities (DPPH radical scavenging rate of 24.3% and reducing power of 0.28). The residual EP after polysaccharide extraction was commonly discarded as waste, which was used as HTL feedstock for biocrude production in this study. HTL of residual EP resulted in a biocrude yield of 26.6 wt.%, dry-ash free (daf) and a hydro-char yield of 22.4 wt.%, daf, which were comparable with that of raw EP, suggesting the desirability of integrated biorefinery of EP to simultaneously obtain value-added polysaccharide and biocrude. We also proved that hydrothermally co-liquifying residual EP with microalgae ( Chlorella sp. ) under various mixing ratios were technically feasible based upon biocrude’s yield, chemical composition, higher heating value, energy recovery, and carbon recovery. The integrated biorefinery developed in this study is of importance for full utilization of EP, thereby improving the economic viability and sustainability for EP valorization. ? 2022, The Authors. All rights reserved.