Potentiality of Using A. Pinnata to Bioremediate Different Heavy Metals from Polluted Draining Water (original) (raw)
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Azolla pinnata aquatic fronds were tested for their ability to bioaccumulate heavy metals from Yoshida medium supplemented with different heavy metals, i.e. Pb, Cd and Cu at different concentrations 0.0, 0.5, 1.0, 1.5 and 2.0 ppm, at different growth periods of 5, 10, 15, 20, 25 and 30 days. Results revealed that azolla can grow healthy with the accumulation of these metals. The highest fresh and dry weights of azolla were observed after 30 days at 2.0 ppm of Cu. These values were significantly higher than those for Pb and Cd at 1.0 and 0.5 ppm , respectively. Also, azolla fronds exerted higher nitrogenase activity when grown in culture medium without heavy metals, or supplemented with 1.5, 1.5 and 0.5 ppm of Pb, Cd and Cu, respectively. The highest records of nitrogen uptake were obtained, in the presence of Cu (2.0 ppm) treatment, while phosphorus uptake increased with increasing the concentrations of Pb and Cu from 0.5 ppm to 2.0 ppm. On the other hand, phosphorus uptake decrease...
Heavy Metal Accumulation by Azolla pinnata of Dal Lake Ecosystem , India
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Free floating macrophytes play a significant role in removing different types of metals from the water bodies and carry out its purification. In view of their potential Azolla pinnata were collected from Dal Lake, an urban-anthropogenic affected water body of Srinagar city and were studied for accumulation of heavy metals. Azolla pinnata were exposed to 4 mg/l concentration of different heavy metals in the form of (Cu) CuSO4, (Pb) PbNO3, (Cr) K2Cr2O7, (Cd) CdNO3 and (Zn) ZnSO4 for 10 days experimentation period in laboratory conditions. Atomic absorption spectrophotometric analysis have shown initial concentration of these metals in Azolla pinnata as Cu (0.02ppm), Pb (0.085ppm), Cr (0.07ppm), Cd (0.006ppm) and Zn (0.06ppm) and after 10 days period the plant has accumulated Cu (0.90ppm), Pb (0.42ppm), Cr (0.27ppm), Cd (0.042ppm) and Zn (2.1ppm) in the order of Zn>Cu>Pb>Cr>Cd. Present study highlights the fact that Azolla pinnata bioaccumulates large concentration of heavy...
Increasing urbanization, industrialization, over population and habitat modification are leading causes of environmental deprivation and pollution. Heavy metals such as Zn, Cd, Ni, Pb, as etc. are one of the most toxic pollutants which show hazardous effects on all living things. The prevailing purification technologies used for removal of contaminants from wastewater are not only very costly but causes negative impact on ecosystem subsequently. Phytoremediation, an eco-friendly technology which is both ecologically sound and economically feasible is an attractive alternative to the current cleanup methods that are very expensive. This technology involves efficient use of plants including aquatic plants to detoxify or immobilize heavy metals. Aquatic plants are already being used in waste water treatment since long. Thus, this paper reviews the current state of phytoremediation technique based on aquatic plants as an innovative technology and to discuss its usefulness and potential ...
Increasing urbanization, industrialization, over population and habitat modification are leading causes of environmental deprivation and pollution. Heavy metals such as Zn, Cd, Ni, Pb, as etc. are one of the most toxic pollutants which show hazardous effects on all living things. The prevailing purification technologies used for removal of contaminants from wastewater are not only very costly but causes negative impact on ecosystem subsequently. Phytoremediation, an eco-friendly technology which is both ecologically sound and economically feasible is an attractive alternative to the current cleanup methods that are very expensive. This technology involves efficient use of plants including aquatic plants to detoxify or immobilize heavy metals. Aquatic plants are already being used in waste water treatment since long. Thus, this paper reviews the current state of phytoremediation technique based on aquatic plants as an innovative technology and to discuss its usefulness and potential in the waste water remediation.3