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Pilot scale experiment results for KMnO4 preoxidation with two kinds of dosing points (biological pretreatment tank and mixing pool) and various dosages (0–1.5 mg L−1) are shown in Table 4. The results were in agreement with those of the bench scale tests. Preoxidation by KMnO4 could achieve good odor removal efficiency at a dosage of 1 mg L−1, as well as the removal of CODMn and algae. In addition, the effluent chroma and Mn also reached the required standards. However, there were some differences between preoxidation at different dosing points. With the same KMnO4 dosage, a slightly higher CODMn removal efficiency could be obtained by dosing at the mixing pool than at the biological pretreatment tank.

Table 4

Pilot scale experiment by KMnO4 preoxidation

KMnO4 dosage (mg L−1)Dosing pointTONaTurbidity (NTU)pHCODMn (mg L−1)Total algae (104 cells L−1)Chroma (times)Mn (mg L−1)
Biological pretreatment tankb 40 0.32 7.19 3.8 28 0.103 
0.5 29 0.28 7.21 3.1 14 0.082 
0.8 24 0.26 7.18 2.8 0.051 
22 0.25 7.22 2.5 0.011 
1.2 22 0.26 7.17 2.4 0.045 
1.5 22 0.27 7.19 2.3 0.079 
Mixing pool 40 0.31 7.08 3.1 22 0.115 
0.5 29 0.27 7.11 2.5 11 0.089 
0.8 25 0.28 7.09 2.3 0.042 
22 0.24 7.12 2.2 0.009 
1.2 22 0.26 7.11 2.1 0.035 
1.5 21 0.26 7.13 0.081 
KMnO4 dosage (mg L−1)Dosing pointTONaTurbidity (NTU)pHCODMn (mg L−1)Total algae (104 cells L−1)Chroma (times)Mn (mg L−1)
Biological pretreatment tankb 40 0.32 7.19 3.8 28 0.103 
0.5 29 0.28 7.21 3.1 14 0.082 
0.8 24 0.26 7.18 2.8 0.051 
22 0.25 7.22 2.5 0.011 
1.2 22 0.26 7.17 2.4 0.045 
1.5 22 0.27 7.19 2.3 0.079 
Mixing pool 40 0.31 7.08 3.1 22 0.115 
0.5 29 0.27 7.11 2.5 11 0.089 
0.8 25 0.28 7.09 2.3 0.042 
22 0.24 7.12 2.2 0.009 
1.2 22 0.26 7.11 2.1 0.035 
1.5 21 0.26 7.13 0.081 

aNo unit.

bOxidation time of 5 min.

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