Department of Ecology, Environment and Plant Sciences, Stockholm University, 106 91 Stockholm, Sweden.
Int J Environ Res Public Health. 2020 Jun 27;17(13):4623. doi: 10.3390/ijerph17134623.
Floating treatment wetlands (FTWs), consisting of vegetated rafts, may reduce heavy metal levels in polluted water, but the choice of plant species for efficient metal removal needs to be further investigated. We screened the capacity of 34 wetland plant species to remove metals dissolved in water to identify suitable species for FTWs. The plants were grown hydroponically for 5 days in a solution containing 1.2 µg Cd L, 68.5 µg Cu L, 78.4 µg Pb L, and 559 µg Zn L. Results show large variation in metal removal rate and capacity between the investigated species. The species with highest removal capacity could remove up to 52-94% of the metals already after 0.5 h of exposure and up to 98-100% of the metals after 5 days of exposure. Plant size contributed more to high removal capacity than did removal per unit of fine roots. and were the most efficient and versatile species. The findings of this study should be considered as a starting point for further investigation of plant selection for improved water purification by FTWs.
浮床处理湿地（FTWs）由植被筏组成，可能会降低受污染水中的重金属含量，但为了实现高效的金属去除，仍需进一步选择合适的植物物种。本研究筛选了 34 种湿地植物吸收溶解在水中的金属的能力，以确定适合 FTWs 的物种。这些植物在含有 1.2 µg Cd L、68.5 µg Cu L、78.4 µg Pb L 和 559 µg Zn L 的溶液中进行水培 5 天。结果表明，研究物种之间的金属去除率和去除能力存在很大差异。去除能力最高的物种在暴露 0.5 小时后可去除高达 52-94%的金属，在暴露 5 天后可去除高达 98-100%的金属。植物大小比单位细根的去除量更能提高去除能力。 和 是最有效和多功能的物种。本研究的结果应被视为进一步研究 FTWs 通过植物选择来提高水净化效率的起点。
