| Title | Enhanced removal of Microcystis aeruginosa in BDD-CF electrochemical system by simple addition of Fe2+ |
| Authors | Long, Yujiao Li, Hongna Xing, Xuan Ni, Jinren |
| Affiliation | Peking Univ, Dept Environm Engn, Minist Educ, Key Lab Water & Sediment Sci, Beijing 100871, Peoples R China. Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Agr Clean Watershed Res Grp, Beijing 100081, Peoples R China. Minzu Univ China, Coll Life & Environm Sci, Beijing 100081, Peoples R China. |
| Keywords | Blue algae Boron-doped diamond Mechanism Electrochemical Heterogeneous electro-Fenton BORON-DOPED DIAMOND ADVANCED OXIDATION PROCESSES ELECTRO-FENTON PROCESS WASTE-WATER TREATMENT PHOTOELECTRO-FENTON ANODIC-OXIDATION HYDROGEN-PEROXIDE GRAPHITE-FELT DEGRADATION MINERALIZATION |
| Issue Date | 2017 |
| Publisher | CHEMICAL ENGINEERING JOURNAL |
| Citation | CHEMICAL ENGINEERING JOURNAL.2017,325,360-368. |
| Abstract | This study presented a significant enhanced removal of Microcystis aeruginosa by simple addition of Fe2+ at circumneutral pH in the electrochemical system with boron-doped diamond (BDD) anode and carbon felt (CF) cathode. Results showed that over 99.9% of the M. aeruginosa cells were removed in 60 min when 0.2 mM Fe2+ was added to the system. The pseudo-first order rate constant for BDD-CF-Fe2+ system was almost 15 times higher than that (0.005 min(-1)) for BDD-CF system. The excellent performance of the BDD-CF-Fe2+ system over the BDD-CF system was observed over a wide range of pH from 3 to 9. Based on the evolution of Fe2+/Fe3+, pH, H2O2 and OH, mechanism of enhanced removal of M. aeruginosa was revealed in the BDD-CF-Fe2+ system. H2O2 was electrochemically generated through reduction of dissolved oxygen on the surface of the CF cathode, and the added Fe+ was rapidly adsorbed and precipitated also on the CF cathode. Comparisons of BDD-CF-Fe2+, BDD-CF-Fe3+ and BDD-CF-Fe2+/Fe3+ systems proved that the electrochemical reduction of Fe(III) to Fe(II) could guarantee the sustainable cycle between Fe(II) and Fe(III). Through heterogeneous electro-Fenton reactions, much higher amount of OH would be continuously generated compared with the BDD-CF system. Thereby, the lipid peroxidation on the cell membrane of M. aeruginosa was intensified through the addition of Fe2+. Moreover, the degradation of intracellular microcystin was remarkably accelerated, and the extracellular microcystin was controlled more safely due to Fe2+ addition. This study provided an alternative method to enhance the electrochemical mitigation of cyanobacteria-polluted waters. (C) 2017 Elsevier B.V. All rights reserved. |
| URI | http://hdl.handle.net/20.500.11897/470716 |
| ISSN | 1385-8947 |
| DOI | 10.1016/j.cej.2017.05.067 |
| Indexed | SCI(E) |
| Appears in Collections: | 环境科学与工程学院 水沙科学教育部重点实验室（联合） |
