Monitoring and control using on-line ORP on the continuous-flow activated sludge batch reactor system

R. F. Yu, S. L. Liaw, C. N. Chang, H. J. Lu, W. Y. Cheng

Research output: Contribution to journalConference articlepeer-review

70 Scopus citations


On-line monitoring of ORP has been proved to be a practical and useful technique for process control of wastewater treatment systems. This paper presents the feasibility of using on-line ORP monitoring system on a laboratory scale single tank continuous-flow activated sludge batch reactor, which is capable of removing carbon, nitrogen and phosphorus pollutants. Two control strategies, fixed-time and real-time, are applied for process control. Results obtained from fixed-time control study indicate that the variations and the ORP profile can accurately represent dynamic characteristics of system; the pH profile can also indicate some of those characteristics. Also, the breakpoints, setpoints and settime on the ORP and pH profiles are used to establish the real-time control strategy to determine the transfer of operation stages. The real-time experiments show a better performance than fixed-time, thus, on-line ORP and pH monitoring and control is practical for continuous-flow batch activated sludge process control.

Original languageEnglish
Pages (from-to)57-66
Number of pages10
JournalWater Science and Technology
Issue number1
StatePublished - 1997
EventProceedings of the 1st IAWQ International Specialized Conference on Sequencing Batch Reactor Technology -
Duration: 18 Mar 199620 Mar 1996


  • Automation
  • Biological nutrient removal
  • Continuous-flow SBR
  • Monitoring and control
  • On-line measurement
  • ORP and pH


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