Bioremoval of Cadmium by Lemna minor in Different Aquatic Conditions

• Published in: Clean : soil, air, water Vol. 38; no. 4; pp. 370 - 377
• Main Authors: Uysal, Yagmur, Taner, Fadime
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01-04-2010; WILEY‐VCH Verlag
• Subjects: Bioaccumulation; Cadmium; Duckweed; Lemna; Lemna minor; Phytoremediation
• ISSN: 1863-0650; 1863-0669
• DOI: 10.1002/clen.200900271

This study was undertaken to determine the cadmium removal efficiency of Lemna minor when it was used for treatment of wastewater having different characteristics, i. e., pH, temperature and cadmium concentration. Plants were cultivated in different pH solutions (4.5–8.0) and temperatures (15–35°C) in the presence of cadmium (0.1–10.0 mg/L) for 168 h. The amount of biomass obtained in the study period, the concentrations of cadmium in the tissues and in the media and net uptake of cadmium by Lemna have been determined for each condition. The percentages of cadmium uptake (PMU) and bioconcentration factors (BCF) were also calculated. The highest accumulation was obtained for the highest cadmium concentration of 10.0 mg Cd/L as 11.668 mg Cd/g at pH 6.0, and as 38.650 mg Cd/g at 35°C and pH 5.0. The cadmium accumulation gradually increased with initial concentration of the medium, but the opposite trend was observed for the PMU. However, the maximum PMU was obtained as 52.2% in the solution with the lowest concentration of 0.1 mg Cd/L. A mathematical model was used to describe the cadmium uptake and the equation obtained was seen to fit the experimental data very well.
Research Articles: The cadmium (Cd) removal efficiency of Lemna minor is determined when it was used for treatment of wastewater having different characteristics, i. e., pH, temperature and Cd concentration. The percentages of Cd uptake (PMU) and bioconcentration factors (BCF) are also calculated. A mathematical model is used to describe the Cd uptake and the equation obtained is seen to fit the experimental data very well.