Automated operation, operator requirements are reducedDue to elevated SRTs:less susceptible to problems associated with nitrification and toxic organicsless biomass yield => less sludgeDue to high MLSS, high loadings allowedBetter SRT control since no escape of TSS as occasionally observed from secondary clarifiersExcellent effluent qualityExisting plants can be easily retrofittedCan also remove nitrogen and phosphorus with the addition of anaerobic and anoxic zones
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