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  • IWA Publishing  (2)
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  • IWA Publishing  (2)
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  • 1
    Online Resource
    Online Resource
    Composition of extracellular polymeric substances in the activated sludge floc matrix
    IWA Publishing ; 1998
    In:  Water Science and Technology Vol. 37, No. 4-5 ( 1998-02-01), p. 325-333
    Details
    In: Water Science and Technology, IWA Publishing, Vol. 37, No. 4-5 ( 1998-02-01), p. 325-333
    Abstract: The precise role of extracellular polymeric substances (EPS) in relation to the formation and physicochemical properties of microbial floc in wastewater treatment systems is not well known. Studies were undertaken to provide more comprehensive descriptions of EPS and properties of microbial floc. Acidic polysaccharides and DNA were relatively labile components of the EPS when biomass was stored at 4°C or at −20°C, and significant losses of these components were observed within 24 hours. The composition and properties of activated sludge were found to vary between different full-scale treatment systems reflecting the importance of wastewater composition and operation conditions on microbial communities and the response to environmental conditions. The COD:N:P ratio was found to influence hydrophobicity, surface charge and the EPS composition of microbial flocs in well-controlled bench-scale sequencing batch reactors. Phosphorus depleted and P-limited conditions resulted in a decrease in surface charge but increases in acidic polysaccharides which corresponded to a strong carboxyl stretch at 1740 cm−1 when the biomass was analysed by FTIR-spectroscopy. Electron dense particles, identified by energy-dispersive spectroscopy as containing iron, phosphorus and sulfur, were observed in the fibrils of the floc matrix by transmission electron microscopy.
    Type of Medium: Online Resource
    ISSN: 0273-1223 , 1996-9732
    URL: Article
    DOI: 10.2166/wst.1998.0657
    Language: English
    Publisher: IWA Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 764273-8
    detail.hit.zdb_id: 2024780-1
    SSG: 14
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    The relationship between the structure of activated sludge flocs and the sorption of hydrophobic pollutants
    IWA Publishing ; 1998
    In:  Water Science and Technology Vol. 37, No. 4-5 ( 1998-02-01), p. 353-357
    Details
    In: Water Science and Technology, IWA Publishing, Vol. 37, No. 4-5 ( 1998-02-01), p. 353-357
    Abstract: The relationships between the structure of minimally perturbed activated sludge flocs and the sorption of organic contaminants were studied. Sorption, settling velocity, size distributions, floc structure and EPS composition were all examined. The results show significant removal of selected halogenated hydrocarbons and polycyclic aromatic hydrocarbons by biosorption to activated sludge flocs. However, statistically significant effects on the settling or size of the flocs caused by this sorption were not observed. The addition of chromium (Cr(III)) metal ions to the biomass caused observable changes in the floc structure and decreased ruthenium red binding to the acidic polysaccharides of the floc matrix. At low concentrations (0.6 mg/l), chromium caused an increase in the sorption of organic compounds to flocs, suggesting that changes in the floc structure can be induced, which can have an impact on the sorption of pollutants to the flocs.
    Type of Medium: Online Resource
    ISSN: 0273-1223 , 1996-9732
    URL: Article
    DOI: 10.2166/wst.1998.0664
    Language: English
    Publisher: IWA Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 764273-8
    detail.hit.zdb_id: 2024780-1
    SSG: 14
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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