Dewaterability of Anaerobic Digested Sludge with Cations and Chitosan as Dual Conditioners

  • S. W. Lau
  • S. H. Chong
  • H. M. Ang
  • T. K. Sen
  • H. B. Chua
Chapter

Abstract

Anaerobic digested sludge dewatering is very important in sludge management and disposal. In this study, flocculation and dewatering behaviour of anaerobic digested sludge were investigated using metal cations (sodium, magnesium, calcium, ferric and aluminium salts) and chitosan as dual conditioners. The trivalent ferric and aluminium ions were found to be more effective than the monovalent and divalent cations in improving sludge dewaterability as measured by capillary suction time (CST). Post-addition of chitosan into the sludge pre-coagulated with metal cations further enhanced the sludge dewaterability. This study suggests that pre-destabilisation of sludge by coagulation with metal cations followed by chitosan addition as polymeric flocculant may improve the dewaterability of anaerobic digested sludge.

Keywords

Surfactant Hydrolysis Toxicity Magnesium Sludge 

Notes

Acknowledgments

The authors would like to acknowledge Physics Department at Curtin Perth for the image analysis. Dominique Dodge-Wan proofreads this chapter.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • S. W. Lau
    • 1
  • S. H. Chong
    • 2
  • H. M. Ang
    • 2
  • T. K. Sen
    • 2
  • H. B. Chua
    • 1
  1. 1.Department of Chemical Engineering, School of Engineering and ScienceCurtin University Sarawak MalaysiaMiriMalaysia
  2. 2.Department of Chemical Engineering, Faculty of Science and Engineering, School of Chemical and Petroleum EngineeringCurtin UniversityPerthAustralia

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