Erciyes University, Faculty of Science, Department of Biology, Kayseri, Turkey.
Int J Phytoremediation. 2011 Nov-Dec;13(10):970-84. doi: 10.1080/15226514.2010.532242.
In this study, laboratory tests were performed in order to examine growth characteristics of floating aquatic macrophytes (Lemna gibba and Lemna minor) in the presence of wastewater with circulation. The results showed that circulation of the waste water enhanced the kinetics of the process, as compared to the control systems. However, prolonged application of high circulation level had a different effect. In the presence of circulation with aquatic plants, there was additional 85.3-88.2% for BODs and 59.6-66.8% for COD decreases in the water quality indicators. In this study, the effectiveness of L. gibba and L. minor with circulation addition for the removal of four heavy metals (Pb, Ni, Mn, and Cu) from waste water was also investigated. Results from analysis confirmed the accumulation of different metals within the plant and a corresponding decrease of metals in the waste water. At the end of the study of circulation, L. gibba provided the metal removal for Cu, Pb, Ni, and Mn in the waste water as the ratio of 57%, 60%, 60%, and 62%, respectively. In this context, the best results were obtained when the action of L. gibba and L. minor plants, was combined with that of circulation. It is shown that in the presence of L. gibba and L. minor plants that are supplemented with circulation, the national standards of biochemical oxygen demand (BOD5) 27-33 mgL(-1) and chemical oxygen demand (COD) 62-78 mgL(-1) for L. minor and L. gibba, respectively, were reached after treatment. The new results can be used for design calculations regarding expected removal of pollutants by aquatic floating plants.
本研究通过实验室试验考察了在循环流动条件下，浮萍（Lemna gibba 和 Lemna minor）水生植物对污水的生长特性。结果表明，与对照系统相比，污水的循环流动增强了过程动力学。然而，长时间应用高循环水平会产生不同的影响。在有植物和循环流动的情况下，BODs 水质指标下降了 85.3-88.2%，COD 下降了 59.6-66.8%。在本研究中，还研究了浮萍（L. gibba）和少根紫萍（L. minor）与循环添加对废水中四种重金属（Pb、Ni、Mn 和 Cu）的去除效果。分析结果证实了不同金属在植物体内的积累，以及废水中金属相应的减少。在循环研究结束时，浮萍（L. gibba）对废水中 Cu、Pb、Ni 和 Mn 的去除率分别为 57%、60%、60%和 62%。在这种情况下，浮萍（L. gibba）和少根紫萍（L. minor）与循环的协同作用效果最佳。结果表明，在补充循环的浮萍（L. gibba）和少根紫萍（L. minor）的存在下，处理后可分别达到生化需氧量（BOD5）27-33 mgL(-1)和化学需氧量（COD）62-78 mgL(-1)的国家标准。新的研究结果可用于设计计算，以预测水生漂浮植物对污染物的预期去除效果。
