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Biological treatment is one of the most efficient process to remove biodegradable pollutants from wastewater. In practice, this process use air and activated sludge for well over a century. It is largely influenced by aeration equipment, which in addition to introducing oxygen into wastewater for oxidation of organic pollutants, they have to create hydrodynamic conditions to mix wastewater with microorganisms and with air, avoiding dead zones and microorganisms sedimentation. This stage of wastewater treatment is ...