Pathway of organic matter at different temperatures in IAFMBR. Ratios in
each cake were calculated from COD data (in average). (‘‘VFAs’’ represents the COD
concentrations of effluent VFAs; ‘‘Methane’’ is the part of organic matter that lost
from IAFMBR in the form of methane including gaseous and dissolved; ‘‘Biomass &
others’’ is the organic matter used by biomass formation and organic and inorganic
compounds that are unbiodegradable but can be measured as a part of COD).