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A novel two-sludge system of anaerobic anoxic oxic–biological contact oxidation (A2/O–BCO) was developed for high-efficiency utilization of influent carbon sources treating wastewater with low carbon/nitrogen (COD/N) ratio. Unlike traditional A2/O process, the oxidation of ammonium (NH4+-N) in this system mainly took place in the BCO reactor through nitrate (NO3−-N) recycling to provide electron acceptors...
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