Enhancement of micropollutant biotransformation by adding manganese sand in constructed wetlands

文献类型： 外文期刊

第一作者： Wang, Donglin

作者： Wang, Donglin;Ma, Quan;Lin, Hui;Zhou, Jie;Ma, Baiwen;Bai, Yaohui;Qu, Jiuhui;Wang, Donglin;Lin, Hui;Yuan, Suxia

作者机构：

关键词： Wetland treatment; Manganese oxides; Organic micropollutants; Metagenomic assembled genomes; Biodegradation

期刊名称：HELIYON （ 影响因子：4.0； 五年影响因子：4.1 ）

ISSN：

年卷期： 2023 年 9 卷 4 期

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收录情况： SCI

摘要： Recent investigations have shown that the addition of manganese (Mn) sand to constructed wetlands (i.e., Mn-amended CWs) can improve the performance of organic micropollutants (MPs) removal. In addition to the direct oxidation and adsorption of Mn oxides, the indirect role of Mn oxides in MP biotransformation is crucial to the removal of MPs but has seldom been referred to. Herein, we constructed lab-scale CWs with or without the addition of natural Mn sand (similar to 35% Mn oxides) to decipher the influence of Mn oxides on the biotransformation of the six selected MPs which commonly existed in the wastewater. The experimental results showed that the addition of Mn sand to CWs can improve the removal of MPs (8.48% atrazine, 13.16% atenolol, and 6.27% sulfamethoxazole [pairwise Wilcoxon test p < 0.05]). Combining the detection of transformation products and metagenomic sequencing, we found that the enhanced removal of atrazine in the Mn-amended CWs was mainly due to the bioaugmented hydroxylation process. The enrichment of biotransformation-related genes and associated microbes of atenolol and sulfamethoxazole in Mnamended CWs indicated that the addition of Mn sand to CWs can strengthen the biotransformation of MPs. Furthermore, we found that these MP-biodegrading microbes were widely present in the full-scale CWs. Overall, our research provides fundamental information and insights for further application of Mn-amended CWs in MP removal.

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