Orthophosphate Removal Lab Report
Phosphate removal
The change of orthophosphate concentration in culture medium at different initial Cd and Pb concentrations and over time are shown in Figure 1.
The orthophosphate concentration in all Cd and Pb treatment groups decreased markedly within 2 days of initiating the experiments and remained almost unchanged after that except in the solution treated with 1 mgPb/L in which, a significant decrease of phosphate concentration occurred also from day 2 to day 4. Similar tendency was observed in control treatment group.
The phosphate removal efficiencies from the medium with Lemnagibba, monitored on day 2, 4 and 6 of experiment are presented in Table 1.
The removal efficiencies showed maxima on day 4. The greatest values were 90.32%obtained …show more content…
The removal efficiency was about 75.75% as compared to the control. No significant differences were noted between the removal efficiencies in the controls and those obtained with Cd and 10-1mgPb/L.
Nitrate removal
Figure 2 illustrates Nitrate concentration in culture medium at different initial Cd and Pb concentrations and over time are shown in Figure 2.
The Nitrate concentration in the controls and all Cd and Pb treatment groups decreased markedly within 2 days of initiating the experiments and remained almost unchanged after that in the controls and in the solution treated with 1 mgPb/L while a significant increase of nitrate concentration is observed from day 2 to day 4 and a decrease once again from day 4 to day 6 in 10-1mgCd/L and 1mgPb/L treated solutions.
Nitrate nitrogen removal efficiencies from the medium with Lemnagibba, monitored on day 2, 4 and 6 of experiment are presented in Table 2.
The removal efficiencies showed maxima on day 6. The greatest values were 78.63 %obtained at 1mgCd/L and about 71.18 % in 10-1mgPb/L solution whereas there were about 70% and 57% in 10-1 mg/L of Cd and 1mgPb/L …show more content…
No significant differences were noted between the removal efficiencies in the controls and those obtained with 1 mgPb/L.
Growth of Lemnagibba
The effect of Cd and Pb on the growth of the macrophyte at different concentrations and exposure times are shown in Figure 3 and Figure 4.
All duckweed samples showed a significant increase of the relative growth on day 6 as compared to relative growth obtained on day 2 (p0.05) for Cd solutions and 10-1mgPb/L, leading to maximum efficiencies of 89.75% in the control, 86.51% and 90.32% in 10-1mgCd/L and 1 mgCd/L solutions respectively. In 10-1 mg/L and 1mg/L Pb solutions, maximum efficiencies where about 88.44% and 97.53%. From day 4 to day 6, there was no phosphate concentration decrease.
For nitrate, in 1mg Cd/L and in 10-1mgPb/L solutions, concentrations increased significantly from day 2 to day 4 and decreased once again from day 4 to day 6. Nevertheless, when nitrate concentrations increased, values where under initial concentration. In the control and 1 mgPb/L solution, little to no decrease of nitrate concentration was
The change of orthophosphate concentration in culture medium at different initial Cd and Pb concentrations and over time are shown in Figure 1.
The orthophosphate concentration in all Cd and Pb treatment groups decreased markedly within 2 days of initiating the experiments and remained almost unchanged after that except in the solution treated with 1 mgPb/L in which, a significant decrease of phosphate concentration occurred also from day 2 to day 4. Similar tendency was observed in control treatment group.
The phosphate removal efficiencies from the medium with Lemnagibba, monitored on day 2, 4 and 6 of experiment are presented in Table 1.
The removal efficiencies showed maxima on day 4. The greatest values were 90.32%obtained …show more content…
The removal efficiency was about 75.75% as compared to the control. No significant differences were noted between the removal efficiencies in the controls and those obtained with Cd and 10-1mgPb/L.
Nitrate removal
Figure 2 illustrates Nitrate concentration in culture medium at different initial Cd and Pb concentrations and over time are shown in Figure 2.
The Nitrate concentration in the controls and all Cd and Pb treatment groups decreased markedly within 2 days of initiating the experiments and remained almost unchanged after that in the controls and in the solution treated with 1 mgPb/L while a significant increase of nitrate concentration is observed from day 2 to day 4 and a decrease once again from day 4 to day 6 in 10-1mgCd/L and 1mgPb/L treated solutions.
Nitrate nitrogen removal efficiencies from the medium with Lemnagibba, monitored on day 2, 4 and 6 of experiment are presented in Table 2.
The removal efficiencies showed maxima on day 6. The greatest values were 78.63 %obtained at 1mgCd/L and about 71.18 % in 10-1mgPb/L solution whereas there were about 70% and 57% in 10-1 mg/L of Cd and 1mgPb/L …show more content…
No significant differences were noted between the removal efficiencies in the controls and those obtained with 1 mgPb/L.
Growth of Lemnagibba
The effect of Cd and Pb on the growth of the macrophyte at different concentrations and exposure times are shown in Figure 3 and Figure 4.
All duckweed samples showed a significant increase of the relative growth on day 6 as compared to relative growth obtained on day 2 (p0.05) for Cd solutions and 10-1mgPb/L, leading to maximum efficiencies of 89.75% in the control, 86.51% and 90.32% in 10-1mgCd/L and 1 mgCd/L solutions respectively. In 10-1 mg/L and 1mg/L Pb solutions, maximum efficiencies where about 88.44% and 97.53%. From day 4 to day 6, there was no phosphate concentration decrease.
For nitrate, in 1mg Cd/L and in 10-1mgPb/L solutions, concentrations increased significantly from day 2 to day 4 and decreased once again from day 4 to day 6. Nevertheless, when nitrate concentrations increased, values where under initial concentration. In the control and 1 mgPb/L solution, little to no decrease of nitrate concentration was