AimsLimited information is available on plant rhizosphere processes for removing antibiotics in antibiotic-contaminated waters. This study identifies rhizosphere processes and evaluates their relative contributions for the macrolides (ML) removal in aquatic plant systems.MethodsA flask-scale experiment (100 and 300 μg/L ML) incorporating Juncus effuses and Canna indica was used to identify the root adsorption, rhizobacterial influences, and plant uptake responsible for the ML (i.e., anhydroerythromycin A, roxithromycin, clarithromycin and tilmicosin) removal.ResultsTotal ML removal rates due to rhizosphere processes were respectively 43.7–67.6% and 44.3–82.2% at 100 and 300 μg/L ML. J. effuses removed ML more effectively than C. indica (P < 0.05). The relative contribution of rhizospheric pathways to remove all ML followed the order: root sorption > rhizobacterial influence > plant uptake (P < 0.01). Sorption and rhizobacterial activity were important removal pathways in wetland plant microcosms, accounting for 36.5–72.8% and 20.5–54.2% of the total rhizosphere associated removal of ML, respectively.ConclusionsRoot sorption and rhizobacterial influence were the main rhizospheric pathways of ML removal in aquatic plant systems. Fe plaque on the root surface, rhizobacterial number and bacterial activity play significant roles in the removal of target pollutants.

中文翻译：

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去除人工湿地中水生大环内酯类抗生素的根际过程评估

目的 可用于去除抗生素污染水域中抗生素的植物根际过程的信息有限。本研究确定了根际过程并评估了它们对水生植物系统中大环内酯 (ML) 去除的相对贡献。根际细菌的影响和植物吸收导致 ML（即无水红霉素 A、罗红霉素、克拉霉素和替米考星）去除。结果 由于根际过程的总 ML 去除率分别为 43.7-67.6% 和 44.3-82.2%，浓度为 100 μg/L3毫升。J. effuses 比 C. indica 更有效地去除 ML (P < 0.05)。根际路径对去除所有 ML 的相对贡献遵循以下顺序：根吸收 > 根际细菌影响 > 植物吸收 (P < 0.01)。吸附和根际细菌活动是湿地植物微观世界中重要的去除途径，分别占根际相关 ML 去除总量的 36.5-72.8% 和 20.5-54.2%。结论根吸附和根际细菌影响是水生植物根际去除 ML 的主要途径植物系统。根表面的铁斑块、根际细菌数量和细菌活性在去除目标污染物方面起着重要作用。结论根吸附和根际细菌影响是水生植物系统中ML去除的主要根际途径。根表面的铁斑块、根际细菌数量和细菌活性在去除目标污染物方面起着重要作用。结论根吸附和根际细菌影响是水生植物系统中ML去除的主要根际途径。根表面的铁斑块、根际细菌数量和细菌活性在去除目标污染物方面起着重要作用。