A, B are magnetic flocculants and microalgae cell adsorption process. A, B is the magnetic flocculant and CPAM flocculant separation process comparison. Biodiesel is a kind of bioenergy with good development prospects. As one of the sources of biodiesel, microalgae is considered to be the most current alternative to fossil fuels due to its advantages of high growth rate, high oil content, and no occupation of cultivated land. One of the potential biodiesel raw materials. At this stage, because of its high production cost, the large-scale industrial production of microalgae energy is still limited. Among them, the harvesting of microalgae cells is one of the more critical processes, and its cost can account for the total production cost of microalgae. 20%~30%. However, there is still no low-energy, high-efficiency and economical method for the recovery of microalgae. Therefore, seeking a low-cost, high-recovery microalgae harvesting method is of great significance for reducing the production cost of microalgae and improving the competitiveness of microalgae energy. Recently, the research team of Liu Chunchao, a researcher at the Institute of Process Engineering of the Chinese Academy of Sciences, synthesized a novel magnetic flocculant on the basis of traditional cationic polyacrylamide (CPAM) flocculants using magnetic Fe3O4 nanoparticles. The harvest process. The experimental results show that the magnetic flocculant has good harvesting effect for different microalgae in a wide pH range (pH 4-10), and the dosage is 25 mg/kg for Brown algae and Chlorella respectively. At L and 120 mg/L, the recovery at any pH is above 95%. The analysis shows that the electrostatic adsorption between the flocculant and the microalgae cells and the bridging of the CPAM are the main separation mechanisms. Compared with the traditional CPAM flocculant, the magnetic flocculant has the advantages of less dosage, faster separation process, and overcomes the shortcomings of the traditional flocculant residues, effectively avoiding the secondary pollution of the water body. This method laid the foundation for efficient and economical harvesting of microalgae. The above-mentioned related research has been supported by the national key basic research program ("973" program, Nos.2011CB200905, 2011CB200903), the National Natural Science Foundation of China (No. 21106165) and the Chinese Academy of Sciences' Young Scientists for Foreign Scientists Program (No. 2011Y1GA01). Published in academic journal ACS Applied Materials & Interfaces (2014, 6 (1): 109-115).
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A: Brown Botrytis 
B: Chlorella 
A: Flocculation of C. elegans CPAM after flocculation for 30 min 
B: Brown bauxite magnetic flocculant after flocculation magnet adsorption 1 min