Hydrolysis of settleable substrate in domestic sewage

Okutman D., Övez S. , Orhon D.

BIOTECHNOLOGY LETTERS, vol.23, no.23, pp.1907-1914, 2001 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 23
  • Publication Date: 2001
  • Doi Number: 10.1023/a:1013737901624
  • Title of Journal : BIOTECHNOLOGY LETTERS
  • Page Numbers: pp.1907-1914
  • Keywords: domestic sewage, hydrolysis, modeling, O-2 uptake rate, settleable substrate, SLOWLY BIODEGRADABLE SUBSTRATE, ACTIVATED-SLUDGE PROCESS, WASTE-WATER, GENERAL-MODEL, SYSTEMS, BIOMASS

Abstract

The hydrolysis of settle able substrate in domestic sewage was evaluated using its O-2 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 l(-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.