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Table 3

Confirmation experiment for agricultural wastewater treatment

pHConcentration of coagulant (mg/L)Settling time (min)Turbidity removal (%)
COD removal (%)
PredictedActualErrorPredictedActualError
LE as coagulant    
7.7 25.75 8.0 32.00 35.12 3.12 6.19 8.45 2.26 
6.6 56.84 4.4 50.80 52.17 1.37 22.83 24.16 1.33 
4.4 53.60 12.0 83.86 84.39 0.53 60.57 63.96 3.39 
4.0 88.46 6.9 99.55 99.43 0.12 79.87 80.54 0.67 
LE-g-DMC as coagulant    
6.1 10.06 3.3 58.12 54.73 3.39 37.74 32.95 4.79 
8.1 28.13 4.1 69.00 66.43 2.57 47.49 46.01 1.48 
4.6 45.48 3.7 84.50 82.82 1.68 63.61 65.26 1.65 
6.7 63.08 5.0 99.83 99.72 0.11 80.32 81.78 1.46 
Alum as coagulant    
9.3 71.36 1.0 30.00 30.74 0.74 16.91 13.63 3.28 
5.0 29.60 3.1 50.17 52.83 2.66 37.91 37.23 0.68 
6.4 63.14 5.35 75.52 74.85 0.67 60.79 62.85 2.06 
6.7 89.30 19.8 99.27 99.59 0.32 79.95 80.36 0.41 
pHConcentration of coagulant (mg/L)Settling time (min)Turbidity removal (%)
COD removal (%)
PredictedActualErrorPredictedActualError
LE as coagulant    
7.7 25.75 8.0 32.00 35.12 3.12 6.19 8.45 2.26 
6.6 56.84 4.4 50.80 52.17 1.37 22.83 24.16 1.33 
4.4 53.60 12.0 83.86 84.39 0.53 60.57 63.96 3.39 
4.0 88.46 6.9 99.55 99.43 0.12 79.87 80.54 0.67 
LE-g-DMC as coagulant    
6.1 10.06 3.3 58.12 54.73 3.39 37.74 32.95 4.79 
8.1 28.13 4.1 69.00 66.43 2.57 47.49 46.01 1.48 
4.6 45.48 3.7 84.50 82.82 1.68 63.61 65.26 1.65 
6.7 63.08 5.0 99.83 99.72 0.11 80.32 81.78 1.46 
Alum as coagulant    
9.3 71.36 1.0 30.00 30.74 0.74 16.91 13.63 3.28 
5.0 29.60 3.1 50.17 52.83 2.66 37.91 37.23 0.68 
6.4 63.14 5.35 75.52 74.85 0.67 60.79 62.85 2.06 
6.7 89.30 19.8 99.27 99.59 0.32 79.95 80.36 0.41 
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