AAF	Acetic acid fermentation
AB	Acetylene black
ARTP	Atmospheric and room-temperature plasma
BMP	Biochemical methane potential
BSG	Brewer’s spent grain
CFU	Colony forming units
C/N	Carbon-to-nitrogen ratio
CO2	Carbon dioxide
Cr	Chromium
CSTR	Continuously stirred tank reactor
CS	Corn straw
DGS	Distiller’s grains
DIET	Direct interspecies electron transfer
EE	Ether extract
GI	Germination index
HC	Hydrochar
IU	International unit
MFF	Microbial fermented feed
ML	Machine learning
NA	Not Available
NaOH	Sodium hydroxide
NH3	Ammonia
N2O	Nitrous oxide
nZVI	Nanoscale zero-valent iron
OLR	Organic loading rate
PB	Plackett–Burman
RSM	Response surface methodology
SE	Steam explosion
SSF	Solid-state fermentation
VFA	Volatile fatty acid
VR	Vinegar residue
VRB	VR biochar
VS	Volatile solid
ZnCl2	Zinc chloride