Modeling and Multiresponse Optimization for Anaerobic Codigestion of Oil Refinery Wastewater and Chicken Manure by Using Artificial Neural Network and the Taguchi Method

Table 4

S/N responses for different outputs.

Outputs	Parameters	Levels			Range	Rank
		Level 1	Level 2	Level 3
Biogas production	A: ORWW portion in digester (%)	37.21	41.45	40.59	4.24	4
	B: temperature (°C)	44.96	43.29	31.00	13.95	1
	C: sonication time (min)	37.00	43.53	38.73	6.53	3
	D: TS level in digester (%)	44.43	37.90	36.92	7.51	2
Biomethane production	A: ORWW portion in digester (%)	31.06	35.22	34.79	4.16	4
	B: temperature (°C)	38.84	36.75	25.49	13.35	1
	C: sonication time (min)	30.51	37.96	32.61	7.45	3
	D: TS level in digester (%)	38.53	31.66	30.88	7.65	2
CODS removal	A: ORWW portion in digester (%)	39.34	36.46	37.25	2.88	4
	B: temperature (°C)	36.83	35.52	40.70	5.18	2
	C: sonication time (min)	37.43	35.18	40.44	5.26	1
	D: TS level in digester (%)	35.81	36.27	40.98	5.17	3