Carbon Source for Denitrification from Pre-Precipitated Sludge

  • Ingemar Karlsson
Conference paper

Abstract

The organic matter not removed by gravity in a pre-sedimentation tank is in a stable suspension consisting of particles smaller than 0.1 mm. This stable suspension may be destabilized by using low molecular, positively charged metal salts such as polyaluminium sulphate or polyaluminum chloride. These salts are also able to form fluffy hydroxide flocs that can arrest the destabilized particles through general sweep coagulation. Large aggregates capable of being sedimentated are formed. Dissolved compounds like phosphorus are precipitated at the same time. Figure 1 shows that with an effective flocculant and with good initial mixing and floc formation, particles down to 0.1 µ may be destabilized, coagulated and removed from the wastewater (Levine et. al., 1985).

Keywords

Hydrolysis Fermentation Phosphorus Hydrate Carbohydrate 

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References

  1. Levine, A.D., Tchobanoglous, G., Asano, T.: Benefits of Particle Size Management for Biological Wastewater Treatment. (Prepared for presentation at the 1985 ASCE National Conference of Environmental Engineering, Boston, Mass.) University of California, Davis, 1985Google Scholar
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  4. HYPRO: The Eureka Projekt. (Its participants are: Sweden: Kemira Kemi AB; Denmark: I. Krüger AS, Danisco Biotechnology AS, Department of Environmental Engineering, The Technical University of Denmark, Water Quality Institute; Norway: Norwegian Hydrotechnical Laboratory, SINTEF Group NHL, AS Ferriklor)Google Scholar
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  6. EPA: Dewatering Municipal Wastewater Sludges. Design Manual, 1987Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • Ingemar Karlsson
    • 1
  1. 1.Kemira Kemi ABStockholmSweden

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