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Table 1

Experimental ranges and levels of the independent test variables for synthesis of membrane, and operational parameters

Synthesis of membrane
ParametersCoded value-α− 10+ 1+ α
Tannic acid (mg/L) X1 0.075 0.15 0.225 0.3 
TMC (mg/L) X2 0.075 0.15 0.225 0.3 
Temperature (°C) X3 20 35 50 65 80 
Time (min) X4 10 15 20 25 30 
Operational parameters 
 NOM (mg/L) X1 6.91 12.5 18.09 20 
 Time (min) X2 10 16.36 35 53.63 60 
 Pressure (bar) X3 
Synthesis of membrane
ParametersCoded value-α− 10+ 1+ α
Tannic acid (mg/L) X1 0.075 0.15 0.225 0.3 
TMC (mg/L) X2 0.075 0.15 0.225 0.3 
Temperature (°C) X3 20 35 50 65 80 
Time (min) X4 10 15 20 25 30 
Operational parameters 
 NOM (mg/L) X1 6.91 12.5 18.09 20 
 Time (min) X2 10 16.36 35 53.63 60 
 Pressure (bar) X3 
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