In addition to the general advantages of the staged SBR technology, AGS systems present several unique attributes [13]:excellent settling properties, allowing shorter settling times forgood solid–liquid separation and requiring lower construction area; good biomass retention, allowing higher concentration inthe SBR and consequently lower reaction time and/or reactor vol-ume; ability to withstand toxicity and high organic loading rates,making them attractive for industrial wastewater treatment appli-cations; aerobic and anoxic/anaerobic zones within the granules,allowing organic matter, nitrogen and phosphorus removal in thesame system and potentially contributing to the process of azo dyemineralization. Given the particular attributes of aerobic granules,this compact technology has a great potential for the treatmentof the highly variable textile wastewaters, including the biode-colorization of textile dyes that are generally resistant to aerobicbiodegradation, like azo dyes.