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| Study on the effect of lanthanum-modified bentonite and vallisneria spiralis combination on cobalt at the sediment-water interface |
| LI Min-juan1,2, YAN Wen-ming1,2, CHEN Xiang4, LI Qi1, HE Xiang-yu1,3, WU Jing-wei1,3, GUO Zi-rui1,3 |
1. The National Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing 210098, China;
2. Joint International Research Laboratory of Global Change and Water Cycle, Nanjing 210098, China;
3. The College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China;
4. Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing, 210042, China |
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Abstract In order to explore the removal effects and mechanisms of dissolved cobalt(Co) in shallow lake sediments by the combination of vallisneria spiralis (V. spirals) and lanthanum-modified bentonite(LMB). The eutrophic sediment of Meiliang Bay in the Taihu Lake is the research object. Indoor simulation experiments (control group, LMB group, V. spiralis group, and LMB & V. spiralis group) were conducted based on High-resolution Peeper (HR-Peeper) to analyze the in-situ and vertical distribution characteristics of dissolved Co, Fe(II) and Mn in the interstitial water from 10 to -100mm of the sediment profile on days 15, 35 and 66after the addition of remediation materials. The results indicated that LMB and V. spiralis can significantly improve the redox environment of sediment profiles (P<0.05). Compared with the control group, the average concentration of dissolved Co decreased by 0.59%~38.18% in experimental groups. The release and migration of Co during combined use were mainly affected through adsorption of iron/manganese plaque on the root surface and complexed adsorption by LMB. In addition, LMB can promote the growth of V. spiralis. At 0~2cm sediment, the proportion of mobile Co(F1+F2+F3) was 54.91%~80.49%. The combination promoted the transformation of acid extractable state to reducible and oxidizable state. The release of Co at the SWI is mainly controlled by the oxidation-reduction of manganese.
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Received: 10 May 2024
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