Fast Capture and Efficient Removal of Bloom Algae Based on Improved Dielectrophoresis Process

Jinxin Liu, Qinghao Jin, Junfeng Geng, Jianxin Xia, Yanhong Wu () and Huiying Chen ()
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Jinxin Liu: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Qinghao Jin: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Junfeng Geng: Institute for Materials Research and Innovation, Institute for Renewable Energy and Environmental Technologies, University of Bolton, Deane Road, Bolton BL3 5AB, UK
Jianxin Xia: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Yanhong Wu: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Huiying Chen: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China

IJERPH, 2023, vol. 20, issue 1, 1-12

Abstract: A dielectrophoresis (DEP) method for direct capture and fast removal of Anabaena was established in this work. The factors affecting the removal efficiency of Anabaena were investigated systematically, leading to optimized experimental conditions and improved DEP process equipment. The experimental results showed that our improved DEP method could directly capture Anabaena in eutrophic water with much enhanced removal efficiency of Anabaena from high-concentration algal bloom-eutrophication-simulated solution. The removal rate could increase by more than 20% after applying DEP at 15 V compared with a pure filtration process. Moreover, the removal rate could increase from 38.76% to 80.18% in optimized experimental conditions (the initial concentration of 615 μg/L, a flow rate of 0.168 L/h, an AC voltage of 15 V, and frequency of 100 kHz). Optical microscopic images showed that the structure of the captured algae cells was intact, indicating that the DEP method could avoid the secondary pollution caused by the addition of reagents and the release of phycotoxins, providing a new practical method for emergent treatment of water bloom outbreaks.

Keywords: eutrophication; cyanobacteria; Anabaena removal; Dielectrophoresis; water purification (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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