Conversely, the Rs in R30was higher than the correspondingvalues of R60 and RN at an HRT of 12h (also at
HRT of 10 and 8 h). This could possibly due to a higher organic
matteradsorptionratebut a lower degradationrate inR30, since
organic substrates were removed by the adsorptionedegradation
pathway and microorganisms at the exponential
growth stage, such as in R30 with short SRT, had more
absorbability. The lower biogas production in R30 suggested
a lower degradation rate, in that less carbon source or energy
was converted tomethane.Meanwhile,RNshowedhigher total
and specificmethane yield rates,whichsuggestedthatSAnMBR
with a longer SRT at HRT of 12 h would benefit the growth of
methanogenesis and become more efficient in terms of
methane production.