Table 1.

Anaerobic acidification results among different carbohydrates

Type of substrates	Substrate concentration (g/L)	Type of inoculum	Type of feeding	pH (After 48‐h incubation)	Main end‐product	Main end‐product concentration (mmol/L)
Glucose	100	Anaerobic sludge	Continuous	4.78	Ethanol	96
	100	Anaerobic sludge	Shock load	4.99	Ethanol	168.03
	5	Anaerobic sludge	Continuous	4.88	Acetate	11.58
	5	Anaerobic sludge	Shock load	5.52	Ethanol	16.51
	40	Anaerobic sludge	Batch	2.96	Ethanol	297
	40	Activated sludge	Batch	3.06	Ethanol	289.43
Starch	40	Anaerobic sludge	Batch	3.64	Lactic acid	55.77
	40	Activated sludge	Batch	3.53	Lactic acid	34.2
	40	Anaerobic sludge	Continuous	4.13	Lactic acid	56
	40	Anaerobic sludge	Shock load	4.37	Lactic acid	70