Robust on-line control of hexavalent chromium reduction process using a Kalman filter

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In waste water where toxic hexavalent chromium ions are present, it is essential that the hexavalent chromium ions are reduced to the less harmful trivalent chromium ions by dosing with reducing agent such as ferrous sulphate. The problem posed in controlling such a reduction process is that chromium ions cannot be easily measured on-line. In such a process, oxidation-reduction potential (ORP) is widely used. The ORP value, apart from being dependent on the concentration of chromium ions, is also dependent on other redox processes due the presence of other ion species, concentration of ions, temperature, etc. For this reason, the reduction process cannot be effectively controlled using conventional set-point control. The profiles of the ORP during the reduction process shows certain characteristic features which can be used as an indication of the completion of the process. In this paper we have successfully demonstrated a robust switching algorithm using a Kalman filter to control the dosing pump for this reduction process.

Original languageEnglish
Pages (from-to)405-412
Number of pages8
JournalJournal of Process Control
Volume12
Issue number3
DOIs
Publication statusPublished - Apr 2002

Fingerprint

Chromium
Robust Control
Kalman filters
Kalman Filter
Ions
ferrous sulfate
Oxidation
Poisons
Reducing Agents
Waste Water
Dependent
Wastewater
Control Points
Reducing agents
chromium hexavalent ion
Pumps
Point Sets
Pump
Completion
Oxidation-Reduction

Keywords

  • Chromium reduction process
  • Kalman filter
  • On-line control
  • Oxidation reduction potential

ASJC Scopus subject areas

  • Process Chemistry and Technology
  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering

Cite this

Robust on-line control of hexavalent chromium reduction process using a Kalman filter. / Mustafa, Mohd. Marzuki; Rozaimah, S.; Sheikh Abdullah, Siti Rozaimah; Rahman, Rakmi A.

In: Journal of Process Control, Vol. 12, No. 3, 04.2002, p. 405-412.

Research output: Contribution to journalArticle

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AU - Rahman, Rakmi A.

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N2 - In waste water where toxic hexavalent chromium ions are present, it is essential that the hexavalent chromium ions are reduced to the less harmful trivalent chromium ions by dosing with reducing agent such as ferrous sulphate. The problem posed in controlling such a reduction process is that chromium ions cannot be easily measured on-line. In such a process, oxidation-reduction potential (ORP) is widely used. The ORP value, apart from being dependent on the concentration of chromium ions, is also dependent on other redox processes due the presence of other ion species, concentration of ions, temperature, etc. For this reason, the reduction process cannot be effectively controlled using conventional set-point control. The profiles of the ORP during the reduction process shows certain characteristic features which can be used as an indication of the completion of the process. In this paper we have successfully demonstrated a robust switching algorithm using a Kalman filter to control the dosing pump for this reduction process.

AB - In waste water where toxic hexavalent chromium ions are present, it is essential that the hexavalent chromium ions are reduced to the less harmful trivalent chromium ions by dosing with reducing agent such as ferrous sulphate. The problem posed in controlling such a reduction process is that chromium ions cannot be easily measured on-line. In such a process, oxidation-reduction potential (ORP) is widely used. The ORP value, apart from being dependent on the concentration of chromium ions, is also dependent on other redox processes due the presence of other ion species, concentration of ions, temperature, etc. For this reason, the reduction process cannot be effectively controlled using conventional set-point control. The profiles of the ORP during the reduction process shows certain characteristic features which can be used as an indication of the completion of the process. In this paper we have successfully demonstrated a robust switching algorithm using a Kalman filter to control the dosing pump for this reduction process.

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