Application and reactivation of magnetic nanoparticles in Microcystis aeruginosa harvesting

Lin, Zhong and Xu, Yunfeng and Zhen, Zhen and Fu, Yu and Liu, Yueqiao and Li, Wenyan and Luo, Chunling and Ding, Aizhong and Zhang, Dayi (2015) Application and reactivation of magnetic nanoparticles in Microcystis aeruginosa harvesting. Bioresource Technology, 190. pp. 82-88. ISSN 1873-2976

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This study developed a magnetic nanoparticles (MNPs) harvesting and reactivation technique for rapid cyanobacteria Microcystis aeruginosa separation. The harvesting of raw MNPs achieved high efficiency of 99.6% with the MNPs dosage of 0.58g MNPs/g dry-biomass, but gradually decreased to 59.1% when directly reused 5 times. With extra ultrasonic chloroform:methanol solvent treatment, the MNPs can be effectively reactivated for M. aeruginosa harvesting with 60% efficiency after 5 times reactivation and the separation efficiency kept above 93% with 0.20g MNPs/g dry-biomass dosage. The cyanobacteria-MNPs complex can be effectively disrupted by ultrasonic chloroform:methanol solvent treatment and the zeta potential was recovered for MNPs electrostatic attraction. The MNPs adsorption followed the Langmuir isotherm, and the maximum adsorption capacity and Langmuir constant was 3.74g dry-biomass/g and 311.64L/g respectively. This MNPs reactivation technique can achieve low energy separation and reduce MNPs consumption by 67%, providing potential engineering implementation for cyanobacterial biomass harvesting.

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Journal Article
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Bioresource Technology
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Deposited On:
31 Jul 2015 08:36
Last Modified:
22 Nov 2022 01:46