2.1. SAnMBR setup and operating conditions
By changing the volume of daily sludge wasting, three benchscale
SAnMBRs with different SRTs, namely 30, 60 and infinite
days (denoted as R30, R60 and RN, respectively. Infinite SRT
means no sludge wasting was carried out except a smallvolume
sludge was sampled for analysis) were operated at
HRTs of 12, 10 and 8 h, successively. The ambient operating
temperature varied from 25 to 30 C.