| 锰砂人工湿地对污染物的强化去除 |
| 摘要点击 1990 全文点击 654 投稿时间：2021-01-31 修订日期：2021-03-02 |
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| 中文关键词 锰砂 人工湿地 芦苇根系物 生物锰氧化物 微生物群落多样性 |
| 英文关键词 manganese sands constructed wetland Phragmites rhizosphere biogenic Mn oxides microbial community diversity |
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| 中文摘要 |
| 锰砂由于其具有强氧化和吸附作用已被广泛应用于净水领域中，而在人工湿地中以锰砂为填料的相关研究较少.根据前期研究推测，在人工湿地的基质中加入锰砂，其能通过氧化吸附强化去除水中的污染物，而还原生成的Mn （Ⅱ）又能被土壤及根系锰氧化微生物氧化为Mn （Ⅲ/Ⅳ），进而防止Mn （Ⅱ）在水中的释放.为验证该推测，本研究探讨了加入锰砂的芦苇人工湿地对污染物的强化去除能力及微生物学机制.通过比较加入和未加入锰砂（对照组）的人工湿地的运行效果，发现锰砂人工湿地对溶解性有机碳（DOC）、TN和冬季时期NH4+-N的去除具有显著的提升作用.16S rRNA测序结果表明，锰砂基质能显著提升冬季芦苇根系微生物的丰富度和多样性，但对人工湿地整体的群落结构影响较小，这可能与锰砂湿地强化污染物去除能力有关.本研究为人工湿地工艺优化提供了一种新思路. |
| 英文摘要 |
| Manganese (Mn) sands have been widely used in water purification due to their strong oxidation and adsorption abilities. However, there are few reports on the use of manganese sands as filler material in constructed wetlands. Based on previous studies, we speculated that the addition of manganese sands in constructed wetlands would enhance the removal of pollutants from the source water, and the resulting Mn(Ⅱ) could then be oxidized by the rhizosphere and soil microorganisms in the wetlands. To test this hypothesis, this study explored the enhanced removal of pollutants in wetlands constructed with manganese sands as substrates and Phragmites as plants, and also examined the role of Phragmites rhizosphere microorganisms in water purification. By comparing the treatment effects between the wetlands constructed with and without manganese sands (control), we found that the wetland containing manganese sands exhibited significantly improved removal of dissolved organic carbon and total nitrogen, as well as removal of ammonia nitrogen during periods of lower temperature. The 16S rRNA sequencing showed that the addition of manganese sands could increase the richness and diversity of Phragmites rhizosphere microorganisms, but had limited impacts on the microbial community structure, which might be an important factor for enhancing the water treatment performance of constructed wetlands. This study provides a new method for the technological optimization of constructed wetlands. |
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