Combining KMnO4 pre-oxidation and bioaugmented sand filtration to simultaneously treat cyanobacterial bloom lake water and released Mn(II)
Combining KMnO4 pre-oxidation and bioaugmented sand filtration to simultaneously treat cyanobacterial bloom lake water and released Mn(II)
复制标题
KMnO4预氧化与生物强化砂滤相结合同时处理蓝藻水华湖水和释放的Mn(II)
DOI：
10.1016/j.seppur.2019.115765
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发表时间：
2019
影响因子：
8.6
通讯作者：
Qu Jiuhui
中科院分区：
文献类型：
--
作者：
Bai Yaohui;Hu Wanchao;Jian Zhiyu;Qi Weixiao;Chang Yangyang;Huo Yang;Liao Kailingli;Qu Jiuhui
有害的蓝藻水华对湖泊生态系统产生负面影响，并在使用水华水源时影响饮用水处理。为保证出水水质，常采用预氧化法降解蓝藻。然而，从蓝藻细胞中释放污染物可能是治疗过程中的一个问题。针对富营养化湖泊蓝藻水华的特点，提出了一种新的饮用水处理技术。利用分子流式细胞术和16 S rRNA测序，我们比较了蓝藻水华和非水华事件之间的微生物群落生物量和组成。结果表明，蓝藻组成的转变，从一个身份不明的念珠藻科属微囊藻和蓝藻生物量增加21倍后，水华事件。在此基础上，选择KMnO 4作为预氧化剂进行湖水处理。批式实验表明，KMnO_4的加入并没有增加微囊藻毒素-LR的浓度，但确实增加了Mn（II）向水中的释放。为了解决这个问题，我们采用了生物强化砂滤工艺。利用纯锰氧化菌Pseudomonassp. QJX-1和生物膜石英砂从现有的砂过滤器，我们表明，生物强化砂过滤转化锰（II）生物锰氧化物，表现出较强的氧化和吸附能力的有机物和类金属。因此，我们提出了一种替代KMnO 4预氧化+生物强化砂滤系统，以改善水华处理。
Harmful cyanobacterial blooms negatively impact lake ecosystems and affect drinking water treatment when using bloom source water. To guarantee effluent water quality, pre-oxidation is frequently used to break down cyanobacteria. However, the release of contaminants from cyanobacterial cells can be an issue during treatment. Here we proposed a novel drinking water treatment technique based on the characteristics of cyanobacterial blooms in an eutrophicated lake. Using molecular flow cytometry and 16S rRNA sequencing we compared the microbial community biomass and composition between cyanobacterial bloom and non-bloom events. Results demonstrated a cyanobacterial composition shift from an unidentified Nostocaceae genus toMicrocystisand a 21-times increase in cyanobacterial biomass after a bloom event. Based on these findings, KMnO4was selected as a pre-oxidation agent for lake water treatment. Batch experiments revealed that the addition of KMnO4did not increase the concentration of microcystin-LR but did increase the release of Mn(II) into water. To eliminate this issue, we applied a bioaugmented sand filtration process. Using pure Mn(II)-oxidizing bacteriumPseudomonassp. QJX-1 and biofilmed quartz sands from an existing sand filter, we demonstrated that bioaugmented sand filtration transformed Mn(II) to biogenic manganese oxide, which exhibited strong oxidation and adsorption capabilities for organics and metalloids. Hence, we propose an alternative KMnO4pre-oxidation plus bioaugmented sand filtration system to improve bloom water treatment.