Characterisation and biodegradation of settleable organic matter for domestic wastewater

  • Derin Orhon
  • Didem Okutman
  • Guclu Insel


Biodegradation of settled COD is studied by evaluating the associated OUR profile obtained in an aerated batch reactor. Hydrolysis was selected, as in current modelling, as the rate-limiting step for O2 consumption. Settled COD was found to incorporate a significant fraction of active biomass that needs to be accounted for in the evaluation. The analysis of the OUR profile yielded a significantly slower hydrolysis mechanism for settled COD, compared to its soluble slowly biodegradable counterpart.

WaterSA Vol.28(3) 2002: 299-306

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eISSN: 0378-4738