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

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...

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Bibliographic Details
Published in:Water science and technology 1997, Vol.35 (1), p.57-66
Main Authors: Yu, R.-F., Liaw, S.-L., Chang, C.-N., Lu, H.-J., Cheng, W.-Y.
Format: Article
Language:English
Subjects:
Activated carbon
Activated sludge
Activated sludge process
Automation
Batch reactors
biological nutrient removal
Breakpoints
continuous-flow SBR
Control
Dynamic characteristics
Feasibility studies
Monitoring
monitoring and control
Monitoring systems
on-line measurement
On-line systems
ORP and pH
pH effects
Phosphorus
Pollutants
Pollution control
Process control
Process controls
Profiles
Reactors
Real time operation
Sludge
Wastewater
Wastewater treatment
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Summary: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.
ISSN:0273-1223
1996-9732
DOI:10.1016/S0273-1223(96)00879-7