Phytoremediation of levonorgestrel in aquatic environment by hydrophytes |
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| Authors: | Guo Li Jun Zhai Qiang He Yue Zhi Haiwen Xiao and Jing Rong |
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| Institution: | Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China;Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China;Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China;Department of Civil Engineering, McGill University, Montreal, Quebec H3A 0C3, Canada;Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China;Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China |
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| Abstract: | Adsorption and degradation of levonorgestrel (LNG) by two hydrophytes, Cyperus alternifolius (CA) and Eichhornia crassipes (EC), were investigated under light-shielding conditions in the water column. Variations of LNG concentrations inwater, plant root epidermis, root, stemand leaf of the plants were analyzed. The results indicated that the removal efficiency of LNG by hydrophytes over the period of 50 days was significantly greater than the blank control (p < 0.05), with the removal rates of 79.80% ±3.10% and 78.86% ±2.55% for CA and EC, respectively. Compared with bio-adsorption, bio-conversion of LNG was found to be the dominant elimination pathway, evidenced by relatively high conversion rates (77.31% ±2.68% for CA and 77.82% ±2.95% for EC),while the adsorption rates were lower (1.77% ±0.90% for CA and 1.05% ±0.40% for EC). The bio-adsorption and conversion of LNG showed no significant differences between the two hydrophytes. Additionally, the mineralization on root epidermis played an important role in the reduction of LNG in water. |
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| Keywords: | Phytoremediation Hydrophyte Levonorgestrel Hormone Degradation |
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