Solids flow and distribution in the step-feed activated sludge process

Research output: Contribution to journalArticlepeer-review

Abstract

A method is derived to calculate suspended solids concentrations and solids fluxes for the step-feed and contact-stabilization activated sludge processes. With this method, the effect of changes in return flow rate, influent flow rate, and step-feed pattern on clarifier solids loading, sludge wastage, and mixed liquor and return sludge concentrations can be predicted. Also, the change in waste flow rate necessary to maintain the same amount of solids wasting can be computed. Contact times and aeration times are discussed, and their use in making the above predications is derived. A sample calculation is presented. A detailed study of the effects of changes in return flow rate, influent flow rate, and step-feed patterns is performed, with graphs of the relative effects presented.

Original languageEnglish
Pages (from-to)877-895
Number of pages19
JournalCivil Engineering for Practicing and Design Engineers
Volume5
Issue number10
StatePublished - Oct 1986

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