Hydrolysis of settleable substrate in domestic sewage

Didem Okutman, Süleyman Övez, Derin Orhon*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


The hydrolysis of settleable substrate in domestic sewage was evaluated using its O2 utilization rate profile generated in an aerated batch reactor. The hydrolysis rate coefficient was 1.2 d-1, significantly lower than 3.8 d-1 and 1.9 d-1 characterizing soluble and suspended slowly biodegradable fractions. The settled portion of the sewage incorporated an active biomass fraction of 1560 mg COD 1-1 that needed to be accounted for in the hydrolysis kinetics. The texture of the biomass/settled substrate mixture and the gradual hydrolysis of the particulate substrate within the floc structure were examined by microscopic analysis.

Original languageEnglish
Pages (from-to)1907-1914
Number of pages8
JournalBiotechnology Letters
Issue number23
Publication statusPublished - 2001


This study was conducted as part of the sponsored research activities of The Environmental Biotechnology Center of the Scientific and Technical Research Council of Turkey. The Research and Development Fund of the Istanbul Technical University also supported it.

FundersFunder number
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Istanbul Teknik Üniversitesi


    • Domestic sewage
    • Hydrolysis
    • Modeling
    • O uptake rate
    • Settleable substrate


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