Biogas Production Optimization in the Anaerobic Codigestion Process: A Critical Review on Process Parameters Modeling and Simulation Tools

Table 2

Summary of operative parameters for AcoD optimization and their achievements in terms of methane yields.

Substrate	Mixing ratio	C/N ratio	OLRs	Improvements	References
Empty fruit bunches (EFBs) and palm oil mill effluent (POME)	—	45	—	The cumulative CH4 increased from 0.17 to 2.03 l	[38]
Chicken manure (CM), dairy manure (DM), and rice straw (RS)	—	25 and 30	—	Maximum CH4 yield and reduction of ammonia inhibition were observed	[39]
FW/cow manure	2.5	—	11.9 g COD/l/d	441 ml CH4/g VS	[40]
Cabbage, cauliflower, and food waste	0.36 : 0.64	45	0.06 kg VS/m^3 h	Maximum CH4 and high biodegradability (98%) was attained	[41]
Sugarcane bagasse (SB) and fruit-vegetable waste (FVW)	30 : 70	—	—	CH4 yields increased by 56% over monodigestion of SB	[42]
WH/FW	40 : 60	21.47	—	Enhanced biogas volume by 55.2% with maximum biodegradability of 89.3% compared to digesting WH alone	[21]
R. Okamura and OMSW	1 : 3	27.4	—	Improved CH4 yields 177% over R. Okamura treating alone	[22]
CH/WH/FW	25 : 25 : 50	23.7	—	Biogas volume improved by 179.7% with maximum biodegradability of 89.22% over CH testing alone	[43]

h, hours; kg, kilograms.