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To evaluate the effects of internal recycle ratio on nitrous oxide (N2O) generation, we set up three laboratory-scale anaerobic–anoxic–oxic (A2O) wastewater treatment processes, with internal recycle ratios of 100%, 200%, and 300%, respectively. Total nitrogen (TN) removal was markedly enhanced from 45.8% to 61.9%, as the internal recycle ratio increased from 100% to 300%. N2O generation was increased...
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