摘要
      在本研究中，使用不同MnO2含量和固体碳材料制备了Mn-C复合材料，以探索其对营养物质和SMX的同步去除性能。在Mn_20系统中获得了较高的硝酸盐去除性能（97–98%）和最快的硝酸盐清除率（4.97 mg N L-1h−1）。通过表面特征观察到Mn含量和Mn-P化合物的增加，表明MnOx参与了污染物的去除，特别是通过Mn-P沉淀和BioMnOx吸附实现了更高的磷去除率（84–89%）。然而，与基于Mn_0复合材料的系统（74%）相比，具有Mn-C复合材料的体系表现出较低的SMX还原效率（34-51%），这可能归因于大量的Mn（II）积累，损害了某些微生物并降低了MnOx的功能。在Mn-C复合物中观察到隶属于拟杆菌门（Bacteroidetes_vadinHA17）和红环藻科（Rhodocyclaceae）的属的丰度更高，以及地杆菌（Geobacter）和脱硫弧菌（Desulfovibrio）作为关键类群的聚集，负责去除硝酸盐和SMX以及微生物相互作用。此外，磺酰胺ARGs的增加与作为ARGs宿主的Mn-C复合材料中的主要微生物密切相关。本研究拓宽了Mn-C复合材料协同去除营养物质和有机物的知识，支持了氧化锰在废水处理中的潜在应用。
Abstract
In this study, Mn-C composites using different MnO2 contents and solid carbon material were prepared to explore the synchronous removal performance of nutrients and SMX. Higher nitrate removal performance (97–98 %) with quickest nitrate removal rate (4.97 mg N L-1h−1) was obtained in Mn_20 systems. The increased Mn content and Mn-P compound were observed via surface characteristics, indicating the involvement of MnOx in pollutants removal, particularly for higher phosphorus removal (84–89 %) via Mn-P precipitation and BioMnOx adsorption. Nevertheless, compared to systems based on Mn_0 composites (74 %), systems with Mn-C composites presented lower SMX reduction efficiency (34–51 %), which might be attributed to the large Mn(II) accumulation, impairing certain microbes and lower the MnOx function. Higher abundance of genera affiliated to Bacteroidetes_vadinHA17 and Rhodocyclaceae was observed in the Mn-C composites, as well as the gathering of Geobacter and Desulfovibrio as keystone taxa, responsible for the removal of nitrate and SMX and microbial interactions. Besides, the increase of sulfonamide ARGs was closely related to the predominant microbes in the Mn-C composites, which acted as the hosts of ARGs. This study broadens the knowledge of Mn-C composites in synergetic removal of nutrients and organics, and supports the potential application of manganese oxide in wastewater treatment.

https://www.sciencedirect.com/science/article/abs/pii/S1385894723016157