Microbial biodiesel production from industrial organic wastes by oleaginous microorganisms: Current status and prospects

被引：22
作者：
Zhang L. [1 ]
Loh K.-C. [1 ,2 ]
Kuroki A. [1 ]
Dai Y. [3 ]
Tong Y.W. [1 ,2 ]
机构：
[1] NUS Environmental Research Institute, National University of Singapore, 1 Create Way, Create Tower #15-02
[2] Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4
[3] School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai
来源：
Journal of Hazardous Materials | 2022年 / 402卷
基金：
新加坡国家研究基金会;
关键词：
Acidogenic fermentation; Biorefinery; Microbial lipids; Transesterification; Volatile fatty acids;
D O I：
10.1016/j.jhazmat.2020.123543
中图分类号：
学科分类号：
摘要：
This review aims to encourage the technical development of microbial biodiesel production from industrial-organic-wastes-derived volatile fatty acids (VFAs). To this end, this article summarizes the current status of several key technical steps during microbial biodiesel production, including (1) acidogenic fermentation of bio-wastes for VFA collection, (2) lipid accumulation in oleaginous microorganisms, (3) microbial lipid extraction, (4) transesterification of microbial lipids into crude biodiesel, and (5) crude biodiesel purification. The emerging membrane-based bioprocesses such as electrodialysis, forward osmosis and membrane distillation, are promising approaches as they could help tackle technical challenges related to the separation and recovery of VFAs from the fermentation broth. The genetic engineering and metabolic engineering approaches could be applied to design microbial species with higher lipid productivity and rapid growth rate for enhanced fatty acids synthesis. The enhanced in situ transesterification technologies aided by microwave, ultrasound and supercritical solvents are also recommended for future research. Technical limitations and cost-effectiveness of microbial biodiesel production from bio-wastes are also discussed, in regard to its potential industrial development. Based on the overview on microbial biodiesel technologies, an integrated biodiesel production line incorporating all the critical technical steps is proposed for unified management and continuous optimization for highly efficient biodiesel production. © 2020 Elsevier B.V.
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