Abstract
Bioremediation is widely used in organic pollutants disposal. However, very little has been known on its application in constructed wetlands contaminated with organochlorine pesticide, endosulfan in particular. To evaluate the effect of bioremediation on endosulfan removal and clarify the fate, bioaugmentation and biostimulation were studied in laboratory-scale vertical-flow constructed wetlands. After 20 days’ experiment, endosulfan isomers removal efficiencies were increased to 89.24–97.62 % through bioremediation. In bacteria bioaugmentation (E-in) and sucrose biostimulation (E-C), peak concentrations of endosulfan in sediment were reduced by 31.02–76.77 %, and plant absorption were 347.45–576.65 μg kg−1. By contrast, plant absorption in KH2PO4 biostimulation (E-P) was increased to 811.64 and 1,067.68 μg kg−1. Degradation process was probably promoted in E-in and E-C, while plant absorption was enhanced in E-P. Consequently, E-in and E-C were effective for endosulfan removal in constructed wetlands, while adding KH2PO4 had potential to cause air pollution. Additionally, combined bioremediation was not recommended.
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Acknowledgments
The authors gratefully acknowledge financial support by the National Science Foundation of China (21007032), National Water Special Project (2012ZX07203-004), Independent Innovation Foundation of Shandong University (2012JC029), and Natural Science Foundation for Distinguished Young Scholars of Shandong province (JQ201216).
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Responsible editor: Leif Kronberg
Congcong Zhao and HuiJun Xie equally contributed t this work.
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Zhao, C., Xie, H., Mu, Y. et al. Bioremediation of endosulfan in laboratory-scale constructed wetlands: effect of bioaugmentation and biostimulation. Environ Sci Pollut Res 21, 12827–12835 (2014). https://doi.org/10.1007/s11356-014-3107-1
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DOI: https://doi.org/10.1007/s11356-014-3107-1