A Novel Bioflocculant from Raoultella planticola Enhances Removal of Copper Ions from Water

Table 1

Independent variables and their levels in the experimental design.

Independent factors	Symbols	Code levels
		-2	-1	0	+1	+2
Temperature (°C)	A	5	10	20	30	35
pH	B	4	5	7	9	10
Flocculation time (hour)	C	0	0.5	1.5	2.5	3
Bioflocculant dosage (mg/L)	D	2.5	5	10	15	17.5
GO inducer (mg/L)	E	1.5	3	6	9	10.5