(A) The first step is to estimate the values of X/M against the equilibrium SCOD

concentration. The SCOD removal attributed to PAC can be calculated by subtracting the effluent SCOD in the PAC-fed reactor from the effluent SCOD of the control reactor. The estimated values of X and X/M are given in the following table.

PAC dose |
Effluent SCOD |
SCOD removal by PAC |
Ratio |
log log(X/M) | |

(mg/L) (M) |
(mg/L) Ce |
(mg/L) X |
(X/M) |
Ce | |

208 |
459 |
366 |
1.76 |
2.66 0.25 | |

827 |
265 |
560 |
0.68 |
2.42 -0.17 | |

496 |
314 |
356 |
0.72 |
2.50 -0.14 | |

1520 |
194 |
389 |
0.20 |
2.29 -0.70 |

(B) The second step is to plot the log (X/M) values against the various values of the log Ce as shown in Figure 7. By taking the log of both sides of the Freundlich equation we get a straight line whose intercept gives the value K and slope gives the value of 1/n. The log of the Freundlich equation results in the following equation:

The values of log(X/M) and log Ce have been calculated and given in the table above and plotted as shown in Figure 7. From the graph, the slope of the line gives a value of 1/n=2.4218, hence n=0.41 and the intercept gives the value of logK=-6.1665, hence K= 6.81x10-7.

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