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题名: Simultaneous surface-adsorbed organic matter desorption and cell integrity maintenance by moderate prechlorination to enhance Microcystis aeruginosa removal in KMnO4-Fe(II) process
作者: Qi, Jing; Lan, Huachun; Liu, Huijuan; Liu, Ruiping; Miao, Shiyu; Qu, Jiuhui
刊名: WATER RESEARCH
出版日期: 2016-11-15
卷号: 105, 期号:0, 页码:551-558
关键词: KMnO4-Fe(II) process ; Microcystis aeruginosa removal ; Moderate prechlorination ; Surface-adsorbed organic matter ; Cell integrity
DOI: 10.1016/j.watres.2016.09.042
部门归属: 中国科学院饮用水科学与技术重点实验室
英文摘要: The KMnO4-Fe(II) process was proved to have good application potential in Microcystis aeruginosa removal, although at relatively high doses. This study aims to improve the algae removal in KMnO4-Fe(II) process by moderate prechlorination, which can realize the desorption of surface-adsorbed organic matter (S-AOM) from algae cells without damaging cell integrity. S-AOM was proved to not only inhibit algae removal but also maintain cell integrity, using various dilution methods for algal suspension preparation. The dilution after filtration method mainly removed the dissolved organics in cultured M. aeruginosa, while the dilution after centrifugal cleaning method could also remove the S-AOM on algae cells. Compared with the S-AOM-removed algal suspension, the lower algae removal in KMnO4-Fe(II) process and the reduced proportion of damaged cells during prechlorination of algal suspension without S-AOM removed indicated the inhibitory role of S-AOM in algae removal and the protective function of S-AOM toward cell integrity, respectively. Moderate prechlorination of directly diluted M. aeruginosa could be realized at chlorine doses of below 0.5 mg/L, and the damaged cell ratios were below 4% after 5-min prechlorination. The ability of the KMnO4-Fe(II) process to remove algae was dramatically enhanced by the elevation of chlorine dose from 0 to 0.5 mg/L, as more S-AOM was desorbed during prechlorination. Additionally, algae cells were easily captured by flocs after moderate prechlorination, which benefited the floc aggregation for formation of tightly bounded algae flocs. Therefore, the desorption of S-AOM without damaging cell integrity is the key feature of moderate prechlorination, which can be applied in improving the algae removal of KMnO4- Fe(II) process. (C) 2016 Published by Elsevier Ltd.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36212
Appears in Collections:中国科学院饮用水科学与技术重点实验室_期刊论文

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