The column experiments, performed both at the original pH (7.0) and at the pH selected for this work
(5.0), are compared in Figure 5 with the tri-component results from Figure 4. The same column
models were fitted to the experimental results and their parameters are presented in Table 5. The
Fisher’s test shows that the Yan’s model is the best fit for the real effluent tested at pH 5.0; for pH
7.0 the three models are statistically equivalent.
Comparing the sorption capacities of copper estimated by Yan’s model in tri-component system
(Tables 3 and 5) and in the industrial effluent, it can be seen that there is a significant decrease in
capacity (around 50%) in the last case. This may be related with the presence of other substances in
the wastewater, which has a more complex constitution than the tri-component system.
From Yoon-Nelson’s model, when comparing TYN in mono and tri-component systems, respectively
182 and 151 min (Table 3), it is longer in the first case as expected, due to the presence of the other
metals. This parameter has decreased to 83 min, for the real effluent at pH 5.0, probably due to the
increased complexity of real effluent. However, at pH 7.0 the TYN is higher than these values, 209
min, which may be related with the beginning of hydroxides precipitation reported for pH values
higher than 6. The influence of pH in the capacity is significant in the range 5-7 (Table 5) and is
higher 17% at pH 7.0.
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
The column experiments, performed both at the original pH (7.0) and at the pH selected for this work
(5.0), are compared in Figure 5 with the tri-component results from Figure 4. The same column
models were fitted to the experimental results and their parameters are presented in Table 5. The
Fisher’s test shows that the Yan’s model is the best fit for the real effluent tested at pH 5.0; for pH
7.0 the three models are statistically equivalent.
Comparing the sorption capacities of copper estimated by Yan’s model in tri-component system
(Tables 3 and 5) and in the industrial effluent, it can be seen that there is a significant decrease in
capacity (around 50%) in the last case. This may be related with the presence of other substances in
the wastewater, which has a more complex constitution than the tri-component system.
From Yoon-Nelson’s model, when comparing TYN in mono and tri-component systems, respectively
182 and 151 min (Table 3), it is longer in the first case as expected, due to the presence of the other
metals. This parameter has decreased to 83 min, for the real effluent at pH 5.0, probably due to the
increased complexity of real effluent. However, at pH 7.0 the TYN is higher than these values, 209
min, which may be related with the beginning of hydroxides precipitation reported for pH values
higher than 6. The influence of pH in the capacity is significant in the range 5-7 (Table 5) and is
higher 17% at pH 7.0.
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
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