Abstract
The capability of anoxic–aerobic (A/O) process treatment and influencing factors of high concentration ammonia industrial wastewater were studied in this paper. Results showed that the A/O process system had achieved favorable performance and the quality of effluent could meet the direct emission standard of Discharge standard of water pollutants for ammonia industry (GB13458-2013) under the optimal conditions as follows: the perfect inflow loading of ammonia 0.12 kg/(m3 d), the mixed liquid recycle ratio (R) 200%, and sludge return ratio 80%, the carbon-to-nitrogen ratio (C/N ratio) 4.5–5.5. Besides, the results also confirmed that the activity of nitrifying bacteria in activated sludge was greatly inhibited due to the high concentration of free ammonia (FA). In addition, carbon shortage had a marked effect on the denitrification efficiency of the system.
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