Sludge pre-recycle control of dynamic enhanced biological phosphorus removal system: An application of on-line fuzzy controller

W. C. Chang, C. F. Ouyang, W. L. Chiang, C. W. Hou

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

This study presents a specific process control strategy, i.e. sludge pre-recycle control, for a dynamic enhanced biological phosphorus removal system by integratedly considering two factors: appropriately controlling F/M ratio in the anaerobic zone, and eliminating hydraulic shock in the secondary clarifier. Fuzzy logic inference is also introduced while constructing an on-line controller owing to the ill-defined characteristics of the dynamic enhanced biological phosphorus removal system. For comparison, continuous-flow pilot plant experiments with automatic monitoring and real-time control facilities are performed using two control strategies: sludge pre-recycle control and conventional (F/M)an control. Experimental results indicate that similar effluent ranges of dissolved COD and dissolved phosphate can be obtained from the two strategies due to their similar (F/M)an ratios. However, reliability analysis reveals that sludge pre-recycle control improves the effluent total SS concentration significantly more than conventional (F/M)an control because of the reduction of hydraulic loading in the clarifier.

Original languageEnglish
Pages (from-to)727-736
Number of pages10
JournalWater Research
Volume32
Issue number3
DOIs
StatePublished - 1 Mar 1998

Keywords

  • Activated sludge
  • Dynamic control
  • Enhanced biological phosphorus removal (EBPR)
  • Fuzzy logic
  • On-line
  • Sludge pre-recycle control

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