Intermittent fasting for microbes: how discontinuous feeding increases functional stability in anaerobic digestion

Table 1 Model parameters used for acetic, propionic, and butyric acid as well as hydrogen converting populations

	Yield Y (gCOD_X gCOD ⁻¹_S )	Maximum substrate utilization rate k_m (gCOD_S gCOD ⁻¹_X day⁻¹)	Half saturation constant K (gCOD_S L⁻¹)	Decay rate k_dec	pH inhibition	References
X_ac,1	0.033	20	0.32	0.02	pH_l = 4; pH_u = 5.5	This study
	0.060	8.95	0.32	0.1	N/A	[26]
X_ac,2	0.033	14.5	0.09	0.02	pH_l = 6.3; pH_u = 7	This study
	0.042	2.77	0.09	0.0064	N/A	[26]
X_h2	0.032	35	7 × 10⁻⁶	0.02	pH_l = 5; pH_u = 6	This study
	0.060	35	1 × 10⁻⁶	0.02	pH_l = 5; pH_u = 6	[52]
X_pro	0.012	30	0.1	0.02	N/A	This study
	0.040	13	0.1	0.02	N/A	[52]
X_C4	0.012	25	0.2	0.02	N/A	This study
	0.060	20	0.2	0.02	N/A	[52]

X_ac,1 = Methanosarcina, X_ac,2 = Methanosaeta, X_h2 = hydrogenotrophic methanogens, X_pro = propionic acid degraders, X_C4 = butyric acid degraders, pH_l = lower limit and pH_u = upper limit for pH inhibition