Removal of antibiotics and antibiotic resistance genes from domestic sewage by constructed wetlands: Effect of flow configuration and plant species
Removal of antibiotics and antibiotic resistance genes from domestic sewage by constructed wetlands: Effect of flow configuration and plant species
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DOI：
10.1016/j.scitotenv.2016.07.085
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发表时间：
2016-11-15
影响因子：
9.8
通讯作者：
Yang, Yong-Qiang
中科院分区：
文献类型：
--
作者：
Chen, Jun;Ying, Guang-Guo;Yang, Yong-Qiang
本研究旨在探讨不同流态和植物种类的中尺度人工湿地（包括有植物和无植物的人工湿地）对生活污水中抗生素和抗生素抗性基因（ARGs）的去除效果。在室外设置了6个中尺度CW，其中包括3种水流类型（表面流、水平地下流和垂直地下流）和2种植物（Thalia dealbata Fraser和Iris tectorum Maxim）。红霉素-H_2O（ETM-H_2 O）、莫能菌素（MON）、达红霉素（CTM）、柱晶白霉素（LCM）、磺胺甲恶唑（SMX）、甲氧苄啶（TMP）、磺胺二甲嘧啶（SMZ）和磺胺吡啶（SPD）等8种抗生素和12个基因，包括3个磺胺类耐药基因（sull、sul 2和sul 3），四个四环素抗性基因（tetG、tetM、tetO和tetX），两个大环内酯类抗性基因（ermB和ermC），两个氯霉素抗性基因（cmIA和floR）和16 S rRNA（细菌）在不同基质（水、颗粒、基质和植物相）中从中尺度系统中测定。总抗生素的去除率为75.8%至98.6%，而总ARGs的去除率为63.9%至84.0%。植物的存在有利于污染物的去除，潜流式污水处理系统对污染物的去除率高于表流式污水处理系统，尤其是对抗生素的去除率更高。根据质量平衡分析，中尺度污水处理厂运行期间，进水、基质、厂房和出水中检测到的抗生素质量分别为24.7万、4920-10,600、0.05 ~ 041和3500-60,000 μ g。生物降解、基质吸附和植物吸收都对降低营养盐、抗生素和ARGs的负荷起到了一定的作用，但生物降解是去除这些污染物的最主要过程。(C)© 2016 Elsevier B. V.版权所有。
This study aims to investigate the removal of antibiotics and antibiotic resistance genes (ARGs) in raw domestic wastewater by various mesocosm-scale constructed wetlands (CWs) with different flow configurations or plant species including the constructed wetland with or without plant. Six mesocosm-scale CWs with three flow types (surface flow, horizontal subsurface flow and vertical subsurface flow) and two plant species (Thalia dealbata Fraser and Iris tectorum Maxim) were set up in the outdoor. 8 antibiotics including erythromycin-H2O (ETM-H2O), monensin (MON), darithromycin (CTM), leucomycin (LCM), sulfamethoxazole (SMX), trimethoprim (TMP), sulfamethazine (SMZ) and sulfapyridine (SPD) and 12 genes including three sulfonamide resistance genes (sull, sul2 and sul3), four tetracycline resistance genes (tetG, tetM, tetO and tetX), two macrolide resistance genes (ermB and ermC), two chloramphenicol resistance genes (cmIA and floR) and 16S rRNA (bacteria) were determined in different matrices (water, particle, substrate and plant phases) from the mesocosm-scale systems. The aqueous removal efficiencies of total antibiotics ranged from 75.8 to 98.6%, while those of total ARGs varied between 63.9 and 84.0% by the mesocosm-scale CWs. The presence of plants was beneficial to the removal of pollutants, and the subsurface flow CWs had higher pollutant removal than the surface flow CWs, especially for antibiotics. According to the mass balance analysis, the masses of all detected antibiotics during the operation period were 247,000, 4920-10,600, 0.05-041 and 3500-60,000 mu g in influent, substrate, plant and effluent of the mesocosm-scale CWs. In the CWs, biodegradation, substrate adsorption and plant uptake all played certain roles in reducing the loadings of nutrients, antibiotics and ARGs, but biodegradation was the most important process in the removal of these pollutants. (C) 2016 Elsevier B.V. All rights reserved.