A UNIFIED BASIS FOR THE DESIGN OF NITROGEN REMOVAL ACTIVATED-SLUDGE PROCESS - THE BRAUNSCHWEIG EXERCISE

In this study a unified approach is defined for the design of single s ludge pre-denitrification systems, based upon recently developed multi -component modelling of activated sludge. The ''Braunschweig exercise' ' is adopted as a reference point, mainly for the critical review of d ifferent design methods proposed. Emphasis is placed upon the signific ance of process stoichiometry when using different parameters for subs trate and biomass. Relationships proposed for the assessment of excess sludge production and oxygen requirements are evaluated in comparison with the unified approach. A new design methodology is defined and nu merically tested with the basic data generated for the Braunschweig ex ercise. (C) 1998 Published by Elsevier Science Ltd. All rights reserve d.