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Journal of Environmental and Public Health
/
2023
/
Article
/
Tab 8
/
Research Article
Optimization and Modeling of Cr (VI) Removal from Tannery Wastewater onto Activated Carbon Prepared from Coffee Husk and Sulfuric Acid (H
2
SO
4
) as Activating Agent by Using Central Composite Design (CCD)
Table 8
Summary of numerical optimization.
Parameter
Goal
Lower limit
Upper limit
Importance
Optimized values
Desirability
A: pH
Is in range
1
3
3
1.926
1
B: dose
Is in range
3
5
3
4.209
1
C: contact time
Is in range
1
3
3
2.101
1
Cr (VI) adsorption
Maximize
72.51
97.46
5
97.645
1