Respirometric analysis of activated sludge models from palm oil mill effluent

A. Damayanti, Z. Ujang*, M. R. Salim, G. Olsson, A. Z. Sulaiman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


Activated sludge models (ASMs) have been widely used as a basis for further model development in wastewater treatment processes. Values for parameters to be used are vital for the accuracy of the modeling approach. A continuous stirred tank reactor (CSTR), as open respirometer with continuous flow for 20 h is used in ASMs. The dissolved oxygen (DO) profile for 11 days was monitored. It was found the mass transfer coefficient KLa is 0.3 h-1 during lag and start feed phase and 0.01 h-1 during stop feed phase, while the heterotrophic yield coefficient YH is 0.44. Some of the chemical oxygen demand (COD) fractionations of palm oil mill effluent (POME) using respirometric test in ASM models are Ss 50 mg/L, SI 16,600 mg/L, XS 25,550 mg/L, and XI 2,800 mg/L. The comparison of experimental and ASM1 from OUR concentration is found to fit well.

Original languageEnglish
Pages (from-to)144-149
Number of pages6
JournalBioresource Technology
Issue number1
Publication statusPublished - Jan 2010
Externally publishedYes


  • Activated sludge models
  • COD fractionations
  • Palm oil mill effluent
  • Respirometry test


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