Mishra Virendra Kumar, Upadhyaya Alka Rani, Pandey Sudhir Kumar, Tripathi B D
Pollution Ecology Research Laboratory, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221005, India.
Bioresour Technol. 2008 Mar;99(5):930-6. doi: 10.1016/j.biortech.2007.03.010. Epub 2007 May 1.
Three aquatic plants Eichhornia crassipes, Lemna minor and Spirodela polyrhhiza were used in laboratory for the removal of heavy metals from the coal mining effluent. Plants were grown singly as well as in combination during 21 days phytoremediation experiment. Results revealed that combination of E. crassipes and L. minor was the most efficient for the removal of heavy metals while E. crassipes was the most efficient in monoculture. Significant correlations between metal concentration in final water and macrophytes were obtained. Translocation factor i.e. ratio of shoot to root metal concentration revealed that metals were largely retained in the roots of aquatic macrophytes. Analytical results showed that plant roots have accumulated heavy metals approximately 10 times of its initial concentration. These plants were also subjected to toxicity assessment and no symptom of metal toxicity was found therefore, this method can be applied on the large scale treatment of waste water where volumes generated are very high and concentrations of pollutants are low.
在实验室中使用三种水生植物凤眼莲、浮萍和紫萍来去除煤矿废水中的重金属。在为期21天的植物修复实验中，植物单独种植以及组合种植。结果表明，凤眼莲和浮萍的组合对重金属的去除效率最高，而凤眼莲在单作时效率最高。最终水体和大型植物中的金属浓度之间存在显著相关性。转运因子即地上部分与根部金属浓度之比表明，金属主要保留在水生大型植物的根部。分析结果表明，植物根系积累的重金属约为其初始浓度的10倍。还对这些植物进行了毒性评估，未发现金属毒性症状，因此，该方法可应用于大规模处理产生量大且污染物浓度低的废水。
