Design criteria for population selection in activated sludge

Moshe Sheintuch*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The competition between floc-forming and non-settling filamentous populations has been analysed for an activated sludge process incorporating a plug-flow reactor and a settler. The substrate gradient along the reactor facilitates proliferation of the desired population and yields conversions which are higher than any possible in a mixed reactor, but with the disadvantage that larger reactor volumes are required. Design criteria determining the largest recycle ratio which can still assure growth of the floc-former, have been derived for single-substrate competition as well as for competition for oxygen and competition coupled with decay. The structure of the reactor-settler interaction has been analysed and compared with that of a mixed reactor-settler system.

Original languageEnglish
Pages (from-to)173
Number of pages1
JournalChemical Engineering Journal
Issue number3
StatePublished - 1991
Externally publishedYes


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