Optimization of Electrochemical Treatment Process Conditions for Distillery Effluent Using Response Surface Methodology

Table 2

Ranges of independent variables and their levels.

Independent variables	Coded symbol	Coded values and; actual factor levels
		−1	0	+1
pH		1	3	5
Electrolysis time (min)		60	90	120
Current density (mA/cm^2)		20	35	50
Electrolyte concentration (g/L)		1	1.5	2