Removal of micropollutants and cyanobacteria from drinking water using KMnO4 pre-oxidation coupled with bioaugmentation
Removal of micropollutants and cyanobacteria from drinking water using KMnO4 pre-oxidation coupled with bioaugmentation
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使用 KMnO4 预氧化结合生物强化去除饮用水中的微污染物和蓝藻
DOI：
10.1016/j.chemosphere.2018.10.013
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发表时间：
2019-01-01
期刊：
影响因子：
8.8
通讯作者：
Qu, Jiuhui
中科院分区：
文献类型：
--
作者：
Jian, Zhiyu;Bai, Yaohui;Qu, Jiuhui
饮用水中微污染物和蓝藻污染的增加威胁着全世界的人类健康。然而，这些污染物不能通过普通的饮用水处理工艺有效地去除，因此经常需要额外的处理。近年来的研究表明，高锰酸钾预氧化可以有效地去除一些微污染物和蓝藻，但蓝藻毒素和Mn 2+的释放限制了它的使用。为了克服这些问题，我们提出了一种与生物强化相结合的KMnO 4预氧化（例如，砂滤）方法来处理微污染物和蓝藻负载的水。以饮用水源中常见的微污染物2-羟基-4-甲氧基二苯甲酮-5-磺酸（BP-4）和广泛分布的蓝藻铜绿微囊藻（Microcystis aeruginosa）为模型污染物，验证了该方法的可行性。结果表明，KMnO 4预氧化能有效去除水中原有的天然有机物和铜绿微囊藻，但不能去除BP-4，并在处理过程中释放出Mn 2+和微囊藻毒素-LR（MC-LR）。在添加锰氧化细菌菌株（假单胞菌属QJX-1）到KMnO 4处理的溶液中之后，我们发现细菌可以将Mn 2+转化为Mn（III&IV）氧化物，所形成的Mn氧化物然后能够去除BP-4和MC-LR。总的来说，所提出的方法在去除天然有机物（即，减少消毒副产物的形成）、微污染物和蓝细菌以及防止Mn 2+的释放，因此可以被认为是处理污染饮用水的良好替代方案。(C)2018爱思唯尔有限公司版权所有
Increasing micropollutant and cyanobacterial contamination of drinking water threatens human health worldwide. However, these contaminates are not efficiently removed by common drinking water treatment processes, and thus additional treatments are frequently required. Recent investigations have demonstrated that KMnO4 pre-oxidation can efficiently remove some micropollutants and cyanobacteria but the release of cyanobacterial toxins and Mn2+ limit its use. To overcome these problems, we proposed a KMnO4 pre-oxidation coupled with bioaugmentation (e.g., sand filtration) method to treat micropollutant- and cyanobacteria-laden water. We used 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid (BP-4, a common micropollutant in drinking water sources) and Microcystis aeruginosa (a widely distributed cyanobacterial species) as model pollutants to verify the feasibility of the proposed method. Results revealed that KMnO4 pre-oxidation efficiently removed existing natural organic matter and Microcystis aeruginosa but failed to remove BP-4 and released Mn2+ and microcystin-LR (MC-LR) during treatment. Following the addition of a manganese-oxidizing bacterial strain (Pseudomonas sp. QJX-1) to the KMnO4-treated solution, we found that the bacteria could transform Mn2+ to Mn(III&IV) oxides, with the formed Mn oxides then able to remove BP-4 and MC-LR. Overall, the proposed method exhibited advantages in the removal of natural organic matter (i.e., decreasing disinfection byproduct formation), micropollutants, and cyanobacteria as well as preventing the release of Mn2+ , and thus may be considered a good alternative for treating polluted drinking water. (C) 2018 Elsevier Ltd. All rights reserved.