Department of Environmental Sciences, School of Earth Sciences and Natural Resource Management, Mizoram University, Tanhril, Aizawl, India.
Int J Phytoremediation. 2010 Mar;12(3):226-42. doi: 10.1080/15226510903563843.
Metals and several physicochemical parameters, from four sampling sites in a tropical lake receiving the discharges from a thermal power plant, a coal mine and a chlor-alkali industry, were studied from 2004-2005. Pertaining to metal pollution, the site most polluted with heavy metals was Belwadah, i.e., waters and sediments had the highest concentration of all the metals examined. The reference site was characterized by the presence of low concentrations of metals in waters and in sediments. Further, several wetland plants were harvested from different sites, and simultaneously, these were assessed for their metal concentration efficiency. Following the water quality monitoring and metal concentration efficiency, two-month field phytoremediation experiments were conducted using large enclosures at the discharge point of different polluted sites of the lake. Eichhornia crassipes, Lemna minor, and Azolla pinnata were frontier metal accumulators hence selected for previously mentioned field phytoremediation experiments. During field phytoremediation experiments using aquatic macrophytes, marked percentage reduction in metals concentrations were recorded. The percentage decrease for different metals was in the range of 25-67.90% at Belwadah (with Eichhornia crassipes and Lemna minor), 25-77.14% at Dongia nala (with Eichhornia crassipes, Lemna minor, and Azolla pinnata) and 25-71.42% at Ash pond site of G.B. Pant Sagar (with Lemna minor and Azolla pinnata). Preliminary studies of polluted sites are therefore useful for improved microcosm design and for the systematic extrapolation of information from experimental ecosystems to natural ecosystems.
从 2004 年至 2005 年，对接收自火力发电厂、煤矿和氯碱厂排放的污水的热带湖泊的四个采样点的金属和几种物理化学参数进行了研究。就金属污染而言，重金属污染最严重的地点是 Belwadah，即水和沉积物中所有检测金属的浓度最高。参照点的特点是水和沉积物中金属浓度低。此外，从不同地点采集了几种湿地植物，并同时评估了它们的金属浓缩效率。在水质监测和金属浓缩效率之后，在湖泊不同污染点的排放口使用大型围栏进行了为期两个月的野外植物修复实验。水葫芦、浮萍和满江红是前沿金属积累者，因此被选用于上述野外植物修复实验。在利用水生植物进行野外植物修复实验期间，记录到金属浓度明显降低。不同金属的百分比降低范围在 25-67.90%之间（在 Belwadah 使用水葫芦和浮萍）、25-77.14%（在 Dongia nala 使用水葫芦、浮萍和满江红）和 25-71.42%（在 G.B. Pant Sagar 的 Ash 池塘使用浮萍和满江红）。因此，对污染地点的初步研究有助于改进微宇宙设计，并从实验生态系统系统地推断信息到自然生态系统。
