Revised capillary suction time (CST) test to reduce consumable costs and improve dewaterability interpretation

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


The aim of this paper is to critically assess the standard capillary suction time (CST) test and to propose a modified device (prototype) and a revised CST procedure. The empirical CST test (using a circular funnel) is well established as the leading method for the determination of sludge dewaterability in spite of its current shortcomings such as restricted modelling possibilities, and therefore the ability to predict physical processes such as the amount of water bound by the paper. Nevertheless, the CST apparatus is portable, and the method is easy to conduct, quick, cost-effective and accurate, if the product of solid concentration and average specific resistance to filtration is of interest. A novel prototype with a rectangular instead of a circular funnel incorporating a stirrer (optional), and using a cheaper paper with similar or improved characteristics is proposed to reduce consumable costs and improve dewaterability interpretation.

Original languageEnglish
Pages (from-to)336-344
Number of pages9
JournalJournal of Chemical Technology and Biotechnology
Issue number3
Publication statusPublished - Mar 2006
Externally publishedYes


  • Capillary suction time (CST)
  • Control
  • Dewaterability
  • Filtration
  • Product design
  • Sedimentation
  • Sludge dewaterability

ASJC Scopus subject areas

  • Biotechnology
  • General Chemical Engineering
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Waste Management and Disposal
  • Pollution
  • Organic Chemistry
  • Inorganic Chemistry


Dive into the research topics of 'Revised capillary suction time (CST) test to reduce consumable costs and improve dewaterability interpretation'. Together they form a unique fingerprint.

Cite this