UV/persulfate preoxidation to improve coagulation efficiency of Microcystis aeruginosa
Yiqun Chen (Huazhong University of Science and Technology, Key Laboratory of Water and Wastewater Treatment)
Pengchao Xie (Key Laboratory of Water and Wastewater Treatment, Huazhong University of Science and Technology)
Zongping Wang (Huazhong University of Science and Technology, Key Laboratory of Water and Wastewater Treatment)
Ran Shang (TU Delft - Civil Engineering & Geosciences, Huazhong University of Science and Technology)
Songlin Wang (Key Laboratory of Water and Wastewater Treatment, Huazhong University of Science and Technology)
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Abstract
The performance of UV-activated persulfate (UV/PS) technology as preoxidation process to enhanceMicrocystis aeruginosa removal by subsequent coagulation-sedimentation was firstly evaluated. Theresults demonstrate that UV/PS preoxidation could successfully promote coagulation of algae cellsthrough the effective neutralization of zeta potential, which was caused by the changes of cell mor-phology, size distribution and surface properties after simultaneous UV irradiation and formed reactivespecies (i.e. SO4•−and HO•) oxidation. Since excessive oxidation would cause cell rupture along withthe release of organics, which could deteriorate coagulation efficiency, optimal PS dose (60 mg/L) andUV dose (375 mJ/cm2) were proposed to exist in this study. The concentrations of extracellular algal∗