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A laboratory-scale anaerobic-anoxic-aerobic process (A2O) with a small aerobic zone and a bigger anoxic zone and biologic aerated filter (A2O-BAF) system was operated to treat low carbon-to-nitrogen ratio domestic wastewater. The A2O process was employed mainly for organic matter and phosphorus removal, and for denitrification. The BAF was only used for nitrification which coupled with a settling...
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