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An anaerobic/aerobic filter (AF/BAF) system was developed treating dairy wastewater. The influent was blended with recirculated effluent to allow for pre-denitrification in the AF followed by nitrification in the BAF. The recirculation ratio ranged 100–300%. The average chemical oxygen demand (COD) removal efficiency was 79.8–86.8% in the AF and the average total nitrogen removal efficiency was 50...
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