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Table 3

Average removal efficiencies of BOD, COD and for each operation

OperationsCOD
BOD

Removal (%)naStdevbRemoval (%)naStdevbRemoval (%)naStdevb
Total 91.7 89 5.3 97.2 48 2.7 98.9 46 1.8 
Filtration (control) 89.6 3.2 97.7 0.6 96.3 2.5 
Relaxation 89.7 2.4 97.0 0.9 98.9 0.8 
Standard backwash 92.4 2.1 97.9 0.9 98.6 0.6 
Chemical + standard backwash 92.2 10 1.7 99.2 0.5 99.5 0.2 
54 LMH 94.1 2.7 98.8 0.9 99.5 0.2 
36 LMH 94.2 2.2 98.2 1.4 99.5 0.3 
27 LMH 90.2 10 5.0 96.8 10 3.2 99.5 0.1 
18 LMH 91.2 33 6.1 94.8 10 3.4 98.9 0.6 
One-way ANOVA P = 0.520 > 0.05 P = 0.079 > 0.05 P = 0.406 > 0.05 
OperationsCOD
BOD

Removal (%)naStdevbRemoval (%)naStdevbRemoval (%)naStdevb
Total 91.7 89 5.3 97.2 48 2.7 98.9 46 1.8 
Filtration (control) 89.6 3.2 97.7 0.6 96.3 2.5 
Relaxation 89.7 2.4 97.0 0.9 98.9 0.8 
Standard backwash 92.4 2.1 97.9 0.9 98.6 0.6 
Chemical + standard backwash 92.2 10 1.7 99.2 0.5 99.5 0.2 
54 LMH 94.1 2.7 98.8 0.9 99.5 0.2 
36 LMH 94.2 2.2 98.2 1.4 99.5 0.3 
27 LMH 90.2 10 5.0 96.8 10 3.2 99.5 0.1 
18 LMH 91.2 33 6.1 94.8 10 3.4 98.9 0.6 
One-way ANOVA P = 0.520 > 0.05 P = 0.079 > 0.05 P = 0.406 > 0.05 

an = sample size.

bStdev = standard deviation of sample.

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