ARG	antibiotic resistance gene
ARB	antibiotic resistant bacteria
AS	activated sludge
DNR	Daewoo nutrient removal
HGT	horizontal gene transfer
KSBNR	Kist Shinwon biological nutrient removal
MGEs	mobile genetic elements
MLE	modified Ludzack–Ettinger
MLS	macrolide–lincosamide–streptogramin
NMDS	nonmetric multidimensional scaling
qPCR	quantitative real time PCR
WWTP	wastewater treatment plant