The pathways of CODinfluent in IAFMBR can be summarized as
CODVFAs, CODmethane and CODbiomass&others. CODVFAs included the
COD of acetic acid, propionic acid, butyric acid and valeric acid in
the effluent. CODmethane was the part of organic matter that both
measured in biogas and dissolved in the effluent. CODbiomass&others
was the COD of other patterns, which included the organic that utilized
for biomass formation, converted to trace amounts of CO2, H2
or other types of VFAs, and unbiodegradable organic matter but
can be measured as a part of COD.