标题: A fungal immobilization technique for efficient harvesting of oleaginous microalgae: Key parameter optimization, mechanism exploration and spent medium recycling
作者: Chu, RY (Chu, Ruoyu); Li, SX (Li, Shuangxi); Yin, ZH (Yin, Zhihong); Hu, D (Hu, Dan); Zhang, LB (Zhang, Lingbo); Xiang, MD (Xiang, Mingdeng); Zhu, LD (Zhu, Liandong)
来源出版物: SCIENCE OF THE TOTAL ENVIRONMENT 卷: 790 文献号: 148174 DOI: 10.1016/j.scitotenv.2021.148174 出版年: OCT 10 2021
摘要: To confront with energy crisis, microalgae as the promising feedstock have a great potential in exploring renewable energy field, whereas the high costs related to medium preparation and biomass harvesting are the main bottleneck to hinder the development on a large scale. Though cultivation of filamentous fungi for microalgae harvesting is an efficient, sustainable and emerging method, and the studies on specific mechanisms and spent medium recycling for efficiency improvement as well as resource saving through a co-pelletization mode are urgently needed. Hence, in this study, the harvesting process of autotrophic microalgae Chlorella vulgaris by pre cultured Aspergillus oryzae pellets was investigated systematically. The highest efficiency (99.23%) was obtained within 5 h under the optimized conditions of 30 degrees C, 130 rpm and fungi:algae ratio of 1:1 on a dry weight basis without demand for pH adjustment (initial value on 9.68). Charge neutralization was not the main mechanisms involved in fungi-algae aggregations, and the functional group changes on cell surfaces as well as secreted metabolites in medium could be mainly responsible for inducing the bioflocculation process. After harvesting, separated water could also effectively support microalgae re-growth. The biomass concentration in medium with 50% recycling was higher than that in fresh medium, while lipid content was increased from 24.37% to 33.97% in fully recycled medium. These results indicated that the pellet-assisted mode for algal harvesting is a promising way to promote biofuel production and resource recycling. (c) 2021 Elsevier B.V. All rights reserved.
作者关键词: Microalgae harvesting; Fungal-algal pellets; Bioflocculation mechanism; Medium recycling; Re-cultivation
地址: [Chu, Ruoyu; Li, Shuangxi; Yin, Zhihong; Hu, Dan; Zhang, Lingbo; Zhu, Liandong] Wuhan Univ, Hubei Key Lab Biomass Resources Chem & Environm B, Hubei Int Sci & Technol Cooperat Base Sustainable, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.
[Xiang, Mingdeng] Minist Ecol & Environm, State Environm Protect Key Lab Environm Pollut Hl, South China Inst Environm Sci, Guangzhou 510655, Peoples R China.
通讯作者地址: Zhu, LD (通讯作者)，Wuhan Univ, Hubei Key Lab Biomass Resources Chem & Environm B, Hubei Int Sci & Technol Cooperat Base Sustainable, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.
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