Application and reactivation of magnetic nanoparticles in Microcystis aeruginosa harvesting. (August 2015)

• Record Type: Journal Article
• Authors: Lin, Zhong; Xu, Yunfeng; Zhen, Zhen; Fu, Yu; Liu, Yueqiao; Li, Wenyan; Luo, Chunling; Ding, Aizhong; Zhang, Dayi
• Is Part Of: Bioresource technology. Volume 190(2015)
• Page Start: 82
• Page End: 88
• Publication Date: 2015-08
• Subjects: Magnetic nanoparticles (MNPs) -- Microcystis aeruginosa -- Cyanobacteria harvesting -- Electrostatic attraction; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2015.04.068
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Effective cyanobacteria harvesting by coprecipitation magnetic nanoparticles. Ultrasonic solvent treatment reactivates MNPs and maintains harvesting performance. Low dosage (0.2 g MNPs/g biomass) with high harvesting efficiency (>93%). Abstract: 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 0.58 g 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 0.20 g 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 3.74 g dry-biomass/g and 311.64 L/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.