Environmental Engineering Division, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India.
Environmental Engineering Division, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India.
Sci Total Environ. 2022 Nov 10;846:157337. doi: 10.1016/j.scitotenv.2022.157337. Epub 2022 Jul 14.
Plants play a cardinal role in removing various pollutants through the synergistic interaction with filling materials and microbes of constructed wetlands (CWs). However, the information regarding the selection of plant species to remove pharmaceutically active compounds (PhACs) is not adequate. The present study attempted to select an appropriate plant species for CWs, considering their characteristics and physiological response to PhACs. In this regard, batch hydroponics studies were carried out to assess the removal, fate, and antioxidative response of carbamazepine (CBZ) in four wetland plant species (Canna indica, Colocasia esculenta, Phragmites australis, and Chrysopogon zizanioides). The specific uptake potential of CBZ (in terms of plant dry biomass) was found to be in the order: C. indica (14.48 mg/g) >P. australis (11.71 mg/g) >C. esculenta (8.67 mg/g) >C. zizanioides (6.04 mg/g). The results showed that exposure to CBZ (0-30 days) caused an accumulation of reactive oxygen species (ROS) in the plant tissues, causing a decline in chlorophyll content, root activity, and increased oxidative stress. However, the selected plants could recover from the oxidative damages to a certain extent in the recuperation phase (31-60 days). C. indica exhibited relatively lesser ROS accumulation and oxidative damage during the experimental phase than other selected plants. The study also showed that plant biomass, transpiration rate, chlorophyll content, root exudates, and root activity influenced the removal of CBZ by various plants (r - 0.76 to 0.98, P < 0.05). The mass balance analysis indicated that a significant proportion of CBZ (49.2 to 72.7 %) underwent metabolism in the plant tissues. Apart from higher removal, lesser accumulation, and lower oxidation stress, multi-criteria decision analysis showed that C. indica is a potential plant species for the removal of CBZ.
植物在通过填充材料和湿地微生物的协同作用去除各种污染物方面起着至关重要的作用。然而，关于选择植物物种去除药物活性化合物（PhACs）的信息还不够充分。本研究试图选择一种适合人工湿地的植物物种，考虑其特性和对 PhACs 的生理反应。为此，进行了批处理水培研究，以评估四种湿地植物物种（美人蕉、芋头、芦苇和狗尾草）对卡马西平（CBZ）的去除、归宿和抗氧化反应。以植物干生物量为单位，CBZ 的特定吸收潜力（specific uptake potential）顺序为：美人蕉（14.48 mg/g）>芦苇（11.71 mg/g）>芋头（8.67 mg/g）>狗尾草（6.04 mg/g）。结果表明，暴露于 CBZ（0-30 天）导致植物组织中活性氧（ROS）的积累，导致叶绿素含量、根活性下降和氧化应激增加。然而，所选植物在恢复期（31-60 天）可以在一定程度上从氧化损伤中恢复。在实验阶段，与其他所选植物相比，美人蕉的 ROS 积累和氧化损伤相对较少。研究还表明，植物生物量、蒸腾速率、叶绿素含量、根分泌物和根活性影响各种植物对 CBZ 的去除（r - 0.76 至 0.98，P < 0.05）。质量平衡分析表明，CBZ 有相当大的比例（49.2%至 72.7%）在植物组织中发生了代谢。除了更高的去除率、更低的积累率和更低的氧化应激外，多准则决策分析表明，美人蕉是去除 CBZ 的潜在植物物种。
