Short-Term Effects of Biogas Digestates and Pig Slurry Application on Soil Microbial Activity

Table 2

Operating parameters of the biogas plant reactors (i.e., temperature, retention time, and substrate) from which the four biogas digestates (BD-A, BD-B, BD-C, and BD-D) were obtained.

Operation parameters	Type	BD-A	BD-B	BD-C	BD-D
Temperature		Mesophilic^1	Thermophilic^2	Thermophilic^1	Mesophilic^2
Retention time (days)		40–50	40–50	40–50	20
Substrate type^3 I–VII (%)	I	40	—	33	—
	II	60	—	24	66
	III	—	—	43	—
	IV	—	97	—	—
	V	—	3	—	—
	VI	—	—	—	24
	VII	—	—	—	10

Mesophilic, 20–45^°C.
²Thermophilic, >40^°C.
³Substrate types: slaughterhouse waste (I), source-separated organic household waste (II), food processing waste (III), distiller’s waste from ethanol production (IV), cereals (V), silage (VI), and sludge from grease traps (VIII).