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Odor removal performance by varying the preoxidant dosage in the bench scale experiment is presented in Table 3. It can be seen that both KMnO4 and O3 oxidation achieved better odor removal rates at a higher dosage, which were in the range of 0.5 to 2, and 1 to 4 mg L−1, respectively. A removal rate of 74.9% was gained by pure settling without preoxidant dosage. For KMnO4, an ideal odor removal rate of 83.2% was achieved at a dosage of 1 mg L−1, though a slight increase of 3.4% in removal rate could be achieved by doubling the dosage. Thus, the optimal dosage could be chosen as 1 mg L−1, in view of the odor removal efficiency and financial factors. For preozonation, there also existed a relatively optimal value for dosage, as 84.6–86.7% of TON was eliminated with 3–4 mg L−1 O3. It could be concluded from Table 3 that for the same odor removal performance, O3 dosage had to be twice that of KMnO4.

Table 3

Effect of the preoxidant dosage on odor removal in bench scale experiments

PreoxidantDosage (mg L−1)TONRemoval rate (%)
Without 50.3 74.9 
KMnO4 0.5 40.4 79.8 
33.6 83.2 
1.5 28.6 85.7 
26.8 86.6 
O3a 44.4 77.8 
36.4 81.8 
30.8 84.6 
26.6 86.7 
PreoxidantDosage (mg L−1)TONRemoval rate (%)
Without 50.3 74.9 
KMnO4 0.5 40.4 79.8 
33.6 83.2 
1.5 28.6 85.7 
26.8 86.6 
O3a 44.4 77.8 
36.4 81.8 
30.8 84.6 
26.6 86.7 

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