Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China; China-New Zealand Joint Laboratory of Water Environment Research, Beijing, 100097, China.
Beijing Beike Environmental Engineering Co., Ltd., Beijing, 100080, China.
J Environ Manage. 2020 Sep 15;270:110867. doi: 10.1016/j.jenvman.2020.110867. Epub 2020 Jun 5.
Water pollution caused by antibiotics and heavy metals has attracted considerable concern, and efficient approaches are urgently needed for their removal. The objective of this study was to investigate the potential of Myriophyllum aquaticum for long-term phytoremediation of wastewater containing tetracycline (TC) antibiotics and copper. Seven hydroponic microcosms were constructed, spiked with tetracycline, oxytetracycline (OTC) and chlortetracycline (CTC) (300-30,000 μg/L), alone or simultaneously with Cu (II), and operated for 12 weeks. The TC removal efficiencies using the hydroponic microcosms here were commensurate or higher than those in previous studies. However, the Cu/TC ratio greatly affected the removal, accumulation of TCs by M. aquaticum, and plant growth. Low levels of Cu (II) (<1000 μg/L) promoted TC removal, but excessive Cu (II) (>10,000 μg/L) impeded it. Mass balance analysis showed that most TCs (45%-64% on average) accumulated in the roots of M. aquaticum. Plant biomass was correlated with the removal of COD, TN, TP, and NH-N (p ≤ 0.05) but not with removal of the TCs. Proteobacteria, Bacteroidetes, and Fusobacteria were dominant in the microbial communities, but they showed little correlation with the TC removal. M. aquaticum can be employed as an effective means of TC removal from water. The co-existence of heavy metals should be considered when evaluating the removal potential of TCs in phytoremediation.
水污染由抗生素和重金属引起，已引起相当大的关注，迫切需要有效的方法来去除它们。本研究的目的是研究水蕖对含有四环素（TC）抗生素和铜的废水进行长期植物修复的潜力。构建了七个水培微宇宙，单独或同时用铜（II）注入四环素、土霉素（OTC）和金霉素（CTC）（300-30000μg/L），并运行了 12 周。本水培微宇宙中的 TC 去除效率与以前的研究相当或更高。然而，Cu/TC 比对 TC 的去除、水蕖对 TCs 的积累和植物生长有很大的影响。低浓度的 Cu（II）（<1000μg/L）促进 TC 的去除，但过量的 Cu（II）（>10000μg/L）则阻碍其去除。质量平衡分析表明，大多数 TCs（平均 45%-64%）积累在水蕖的根部。植物生物量与 COD、TN、TP 和 NH-N 的去除呈正相关（p≤0.05），但与 TCs 的去除无关。微生物群落中以变形菌门、拟杆菌门和梭杆菌门为主，但与 TC 去除相关性不大。水蕖可以作为从水中去除 TC 的有效手段。在评估植物修复中 TCs 的去除潜力时，应考虑重金属的共存。
