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Applications of automatic control systems for chlorination and dechlorination processes in wastewater treatment plants

Authors
Journal
ISA Transactions
0019-0578
Publisher
Elsevier
Publication Date
Volume
34
Issue
1
Identifiers
DOI: 10.1016/0019-0578(94)00041-j
Keywords
  • Chlorination
  • Dechlorination
  • Programmable Logic Controller
  • Feedforward-Feedback-Multivariable Controls
  • Relay Control Mode
  • Pid Control Mode
  • Special Function Program Control Mode
  • Disturbance
  • Noises
  • Average Estimator
  • Lag Time (Dead Time)
  • Time Constant
  • Historical Trendings
  • Efficiency
  • Data Analysis
  • Transfer Function
Disciplines
  • Chemistry

Abstract

Abstract Due to recent requirements by the U.S.E.P.A. towards the standards on chlorine residuals for chlorination and dechlorination processes, together with the commitment to optimize the process operating conditions for chemical cost savings and to let the plant operator have more time working on other important projects, the City of Houston has been utilizing automatic control systems (Programmable Logic Controllers) at over twenty WWTPs to meet the above tasks. This paper will present one of the City's WWTPs which implemented the auto-control system. It also discusses how to solve the problems of noises in instrumentation signals and dead time which are common in auto-control systems. Finally, it will show how much success the system has complied with the U.S.E.P.A.'s requirements and effectively reduced the chemical costs.

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