The results showed that the
anaerobic degradation of CODcol produced higher fraction of CODss and CODdis. Moreover, the anaerobic degradation of CODss and CODdis produced higher fraction of CODcol.
The higher production of CODss from the degradation of influent CODcol might be due the production of anaerobic bacteria and bioflocculation of the colloids and the produced bacteria.
It is well known that many living microorganisms have a flocculent growth habit and produce extracellular polymers, usually polysaccharides, polypeptides or peptidoglycans, which enhance biosorption of particles (Dugan, 1987)