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适度预氯化通过表面吸附有机物解吸和保持细胞完整性来增强 KMnOFe(II)工艺中铜绿微囊藻的去除。

Simultaneous surface-adsorbed organic matter desorption and cell integrity maintenance by moderate prechlorination to enhance Microcystis aeruginosa removal in KMnOFe(II) process.

机构信息

State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.

Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.

出版信息

Water Res. 2016 Nov 15;105:551-558. doi: 10.1016/j.watres.2016.09.042. Epub 2016 Sep 21.

Abstract

The KMnOFe(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 KMnOFe(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 KMnOFe(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 KMnOFe(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 KMnOFe(II) process.

摘要

高锰酸钾铁(II)工艺被证明在去除铜绿微囊藻方面具有良好的应用潜力,尽管需要较高的剂量。本研究旨在通过适度预氯化来提高高锰酸钾铁(II)工艺的除藻效果,这种方法可以实现藻细胞表面吸附有机物(S-AOM)的解吸,而不破坏细胞完整性。通过采用不同的稀释方法制备藻悬液,证明了 S-AOM 不仅可以抑制藻类去除,还可以维持细胞完整性。过滤后稀释法主要去除培养的铜绿微囊藻中的溶解有机物,而离心清洗后稀释法可以去除藻细胞上的 S-AOM。与去除 S-AOM 的藻悬液相比,在没有去除 S-AOM 的藻悬液预氯化过程中,高锰酸钾铁(II)工艺的藻类去除率较低,受损细胞比例降低,这表明 S-AOM 在藻类去除过程中具有抑制作用,同时 S-AOM 对细胞完整性具有保护作用。直接稀释铜绿微囊藻可以在氯剂量低于 0.5mg/L 时实现适度预氯化,并且在 5 分钟预氯化后受损细胞比例低于 4%。随着预氯化过程中氯剂量从 0 增加到 0.5mg/L,高锰酸钾铁(II)工艺去除藻类的能力显著增强,因为更多的 S-AOM 被解吸。此外,适度预氯化后,藻类细胞很容易被絮体捕获,这有利于絮体聚集形成紧密结合的藻类絮体。因此,在不破坏细胞完整性的情况下解吸 S-AOM 是适度预氯化的关键特征,可应用于提高高锰酸钾铁(II)工艺的除藻效果。

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