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Organic matter released from activated sludge bacteria cells during their decay process.
H Narita1, I Isshiki, N Funamizu
1Department of Environmental Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 0608628, Japan.
Environmental Technology
|May 24, 2005
Summary
2-keto-3-deoxyoctulosonic acid from bacterial cell walls can indicate organic matter released during wastewater treatment. This study tracked its presence in activated sludge, finding it a reliable indicator of bacterial organic matter contribution.
Area of Science:
- Environmental Science
- Microbiology
- Biochemistry
Background:
- Organic matter release from activated sludge bacteria poses challenges in wastewater reclamation.
- Lipopolysaccharide (LPS) in gram-negative bacterial cell walls contains 2-keto-3-deoxyoctulosonic acid (KDO).
Purpose of the Study:
- To investigate the fate of KDO in activated sludge under different conditions.
- To evaluate KDO as an index for organic matter originating from activated sludge bacteria.
Main Methods:
- Analysis of KDO concentration in hydrolyzed and non-hydrolyzed activated sludge samples.
- Measurement of KDO/(dissolved organic carbon) ratio during sludge sonication and bacterial decay.
- Correlation analysis between degraded heterotrophic biomass and KDO generation.
Main Results:
- KDO was found in both monomeric and polymeric forms (including LPS and fragments).
- The KDO/dissolved organic carbon ratio remained stable during sonication but varied during bacterial decay.
- A linear relationship was observed between bacterial biomass degradation and KDO production.
Conclusions:
- KDO is present in various forms in activated sludge.
- KDO serves as a reliable indicator of organic matter released from activated sludge bacteria.
- Understanding KDO dynamics aids in optimizing wastewater reclamation processes.