标题: Performance evaluation of different chitosan-clay composite materials for efficient harvesting of Chlorella vulgaris and impacts on downstream bioproduct processing and water reusability

作者: Yin, ZH (Yin, Zhihong); Li, SX (Li, Shuangxi); Hu, D (Hu, Dan); Li, Z (Li, Zhuo); Chu, RY (Chu, Ruoyu); Liu, CC (Liu, Chenchen); Li, XZ (Li, Xinzhu); Hu, JJ (Hu, Jiangjun); Zhu, LD (Zhu, Liandong)

来源出版物: CHEMICAL ENGINEERING JOURNAL 卷: 430 文献号: 132892 DOI: 10.1016/j.cej.2021.132892 子辑: 2 出版年: FEB 15 2022

摘要: As an environmentally friendly bioflocculant, chitosan has a great application potential in the field of microalgae harvesting due to its biocompatibility. In this work, three different inorganic clay minerals (kaolin, montmorillonite, and diatomite) were selected to prepare chitosan-clay composite materials (CTS/KAL, CTS/MML and CTS/DTE) as flocculants to harvest microalgae cells. The harvesting capacities of CTS/KAL, CTS/MML and CTS/ DTE were accordingly 97.37%, 97.81% and 98.34% for microalgae cells under the dosage of 60 mg/L, micro algae concentration of 0.923 g/L, settling time of 30 min and pH of 10. CTS/DTE showed excellent harvesting performance for microalgae cells, mainly due to the enhancement of charge neutralization, sweeping and bridging effects. Based on the phenomenological theory, the second-order polynomial model was used to analyze the influences of different external factors on the microalgae harvesting efficiency. A reasonable performance relationship between CTS-clays for harvesting of microalgae cells and external factors was established. The analysis of carbohydrates, proteins, and fatty acids of microalgae biomass collected by CTS/KAL, CTS/MML, CTS/DTE and centrifugation showed that the harvesting of CTS-clay did not influence the properties of biomass. The experimental results of water resource recycling and re-cultivation after microalgae harvesting by CTS/KAL, CTS/MML and CTS/DTE exhibited that the growth rates of 50% circulating medium + 50% fresh BG11 culture medium were accordingly 2.512, 2.466 and 2.572 times higher than those of 100% circulating medium. It is concluded that chitosan-clay composite materials are efficient and environmentally friendly flocculants with a great applicable potential in microalgae harvesting.

作者关键词: Microalgae harvesting; Flocculation mechanisms; Modeling; Downstream impact; Water reusability

KeyWords Plus: MAGNETIC FLOCCULANT; WASTE-WATER; MICROALGAE; BIODIESEL; ACID; SEPARATION; PYROLYSIS; REMOVAL; POLYMER

地址: [Yin, Zhihong; Li, Shuangxi; Hu, Dan; Li, Zhuo; Chu, Ruoyu; Liu, Chenchen; Li, Xinzhu; Hu, Jiangjun; Zhu, Liandong] Wuhan Univ, Sch Resource & Environm Sci, Hubei Key Lab Biomass Resources Chem & Environm B, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430079, Peoples R China.

通讯作者地址: Zhu, LD (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Hubei Key Lab Biomass Resources Chem & Environm B, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430079, Peoples R China.

电子邮件地址: ldzhu@whu.edu.cn

影响因子：13.273