3.3.2. Effect of SRT
The impact of SRT on membrane fouling was distinctive at
different HRTs. Fig. 4a shows the normalized TMP profile of
the three SAnMBR at HRT of 12 h, which consisted of two
R60, although the absolute carbohydrate concentrations of
SMP were rather similar at HRT of 8, 10 and 12 h, the absolute
protein concentration was the highest at HRT of 8 h, followed
by HRTs of 10 and 12 h in decreasing order (Fig. 5a). Due to the
highest OLR at HRT of 8 h, more un-degraded substrates/SMP
were present in the supernatant of mixed liquor (Fig. 5a),
which increased the possibility of external and internal pore
plugging and biocake/biofilm growth when it was drawn onto
the membrane surface by permeation.