Monitoring dissolved COD in a pulp mill wastewater treatment plant by measuring total dissolved solids with a refractometer

Sakari Toivakainen*, Riku Kopra, Heikki Hannukainen, Timo Laukkanen, Olli Dahl

*Corresponding author for this work

Research output: Contribution to journalReview ArticleScientificpeer-review

Abstract

The measurement of total dissolved solids (TDS) and its correlation to dissolved chemical oxygen demand (DCOD) in different kraft pulp mill wastewater solutions was studied at laboratory scale with an online refractometer. The study concluded that TDS can be measured successfully at a kraft pulp mill wastewater treatment plant in spite of suspended solids such as fibres or biosludge. The correlation between DCOD and refractometer measured TDS was very strong. The estimated ratio between the changes in DCOD and in TDS for lignin solutions was 1.81 to 1.85 and for kraft pulp mill wastewater 1.13 to 1.29. Accordingly the removal of DCOD in a plug flow aeration basin of an activated sludge process could be monitored with refractometer TDS measurements.

Original languageEnglish
Pages (from-to)55-60
Number of pages6
JournalAPPITA Journal
Volume70
Issue number1
Publication statusPublished - 1 Jan 2017
MoE publication typeA2 Review article in a scientific journal

Keywords

  • Activated sludge process
  • Chemical oxygen demand
  • COD removal
  • Online measurement
  • Process control
  • Pulp mill wastewater
  • Refractometer
  • Total dissolved solids

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