Table 2. Optimization of the Cocktail parameters for Optimum Degradation of Hydrocarbon using Box-Behnken Response Surface Model.

					21 Days Treatment		56 Days Treatment
		Variable 1	Variable 2	Variable 3	Response 1	Response 2	Response 1	Response 2
Std Order	Run Order	A:Nitrate	B:Phosphate	C:Inoculum size	TPH Removal	THC	TPH Removal	THC
		mg/kg	mg/kg	%	%	%	%	%
5	1	0.331	118.41	5	66.96	62.02	85.15	86.16
6	2	0.662	118.41	5	78.24	80.95	93.96	92.41
11	3	0.4965	39.47	7	76.64	80.00	92.36	85.46
12	4	0.4965	197.35	7	80.48	85.49	93.32	94.08
1	5	0.331	39.47	6	67.48	66.10	87.21	87.72
8	6	0.662	118.41	7	79.97	84.05	94.81	94.93
2	7	0.662	39.47	6	76.38	77.22	92.89	92.69
3	8	0.331	197.35	6	82.03	87.07	85.75	95.61
10	9	0.4965	197.35	5	70.12	69.27	88.99	89.49
7	10	0.331	118.41	7	83.96	88.33	89.66	89.62
4	11	0.662	197.35	6	77.24	80.79	90.77	91.47
13	12	0.4965	118.41	6	89.64	88.97	96.28	96.69
14	13	0.4965	118.41	6	89.64	88.97	96.28	96.69
9	14	0.4965	39.47	5	74.41	74.20	88.48	87.48
15	15	0.4965	118.41	6	89.64	88.97	96.28	96.69

THC = Total Hydrocarbon Content; TPH = Total Petroleum Hydrocarbon; Potassium (plantain peels char) was model in the cocktail ratio with a value of 22mg/kg