1. © The Author(s) 2013. Published by Science and Education Publishing.
Table 2. Four factor five level central composite design for preparing synthetic sample
Experiment Number A B C D 1 70 7
0.75 45 2
130 3 11 4 5
2.25 6 8 9 75 10 12 13 14 15 16 17 40
1.5 60 18
160 19
100 20 21 22 23 30 24 90 25
Ravi Shankar et al. Removal of Lignin from Wastewater through Electro-Coagulation. World Journal of Environmental Engineering, 2013, Vol. 1, No. 2, doi: /wjee-1-2-1
© The Author(s) Published by Science and Education Publishing.