UV/persulfate preoxidation to improve coagulation efficiency of Microcystis aeruginosa

被引:78
作者
Chen, Yiqun [1 ,2 ]
Xie, Pengchao [1 ,2 ]
Wang, Zongping [1 ,2 ]
Shang, Ran [1 ,3 ]
Wang, Songlin [1 ,2 ]
机构
[1] HUST, Sch Environm Sci & Engn, Wuhan 430074, Peoples R China
[2] MOHURD, Key Lab Water & Wastewater Treatment HUST, Wuhan 430074, Peoples R China
[3] Delft Univ Technol, Dept Sanit Engn, POB 5 Box 5048, NL-2600 GA Delft, Netherlands
基金
中国国家自然科学基金;
关键词
Microcystis aeruginosa; Ultraviolet/persulfate; Preoxidation; Coagulation; Disinfection by-products; DISINFECTION BY-PRODUCTS; HARMFUL ALGAL BLOOMS; UV-C IRRADIATION; OXIDATION PROCESS; WATER-TREATMENT; REMOVAL; CHLORINATION; PERSULFATE; MECHANISMS; IMPACT;
D O I
10.1016/j.jhazmat.2016.10.017
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The performance of UV-activated persulfate (UV/PS) technology as preoxidation process to enhance Microcystis aeruginosa removal by subsequent coagulation-sedimentation was firstly evaluated. The results demonstrate that UV/PS preoxidation could successfully promote coagulation of algae cells through the effective neutralization of zeta potential, which was caused by the changes of cell morphology, size distribution and surface properties after simultaneous UV irradiation and formed reactive species (i.e. SO4 center dot- and HO center dot) oxidation. Since excessive oxidation would cause cell rupture along with the release of organics, which could deteriorate coagulation efficiency, optimal PS dose (60 mg/L) and UV dose (375 mJ/cm(2)) were proposed to exist in this study. The concentrations of extracellular algal organic matter (AOM) sharply increased by 48.2% during the preoxidation period, while gradually decreased in the following coagulation and sedimentation. Most of the concerned disinfection by-products (DBPs) monotonically decreased or followed fluctuant reduction with increasing PS doses, whereas the trichloromethane, trichloroacetic acid and dichloroacetonitrile persistently increased, which was inferred to be related to the variation of AOM. This study suggests that UV/PS might be a potential pretreatment process to assist coagulation on the removal of algae. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:508 / 515
页数:8
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