Table 8

Parameter	P1	P2	Optimum Condition
Time (day)	0.583	0.583	20
Salt (g)	0.452	0.000	0.0
Activated sludge (ml)	0.850	0.850	0.0
Bacteria (ml)	89.743	89.743	0.04
Composting (g)	0.000	0.000	0.05
Molasses (g)	2.562	2.546	0.1
Humidity (ml)	2.228	2.228	1.0
Urea (g)	2.037	2.037	0.01
Other error	1.545	1.997	-----
Oil removal percent in optimum conditions			68%

Table 8: The effect percent of each factor (P1), effect percent of more important parameters (P2) and optimum conditions for set 2, determined by the analysis of variance (ANOVA).