Colloid and Polymer Science

, Volume 275, Issue 1, pp 73–81 | Cite as

Optimization of the use of polyelectrolytes for dewatering industrial sludges of various origins

  • N. Böhm
  • W. -M. Kulicke
Original Contribution


Four different industrial slurries were flocculated with polymeric flocculating agents (port sediment, sewage sludge, sugar beet washings and an aluminum hydroxide suspension). The quantities of flocculating agent employed were optimized with the aid of a patented, portable flocculation and dewatering apparatus. Using sewage sludge as an example, it was possible to arrive at predictions for particular doses of flocculating by means of a combined method of dewatering experiments and electrokinetical measurements. The results of monoflocculation and dual flocculation made it possible to deduce that there are similarities in the flocculation and dewatering behavior of slurries with comparable parameters.

Comparison of the sediment particles and the polymer coils revealed a size ratio of 60:1, with the former being the larger. This was then used to devise modifications to the patch charge model and the bridging model as a function of the molar mass of the flocculating agent. The modifications were found to agree well with the experimental findings and the structural conceptions of macromolecular substances.

Key words

Polyelectrolytes flocculation solid-liquid separation zeta-potential bridging model patch charge model 


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Copyright information

© Steinkopff Verlag 1997

Authors and Affiliations

  • N. Böhm
    • 1
  • W. -M. Kulicke
    • 1
  1. 1.Institut für Technische und Makromolekulare ChemieUniversität HamburgHamburgFRG

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