Advanced Nitrogen Removal Via Intracellular Polymers in a Post-denitrification Sequencing Batch Reactor (SBR)

In order to investigate the nitrogen removal performance of sequencing batch reactor (SBR) process treating the wastewater with high COD/NH+4-N ratio, a post-denitrification SBR was proposed to treat the immature landfill leach ate. No extra carbon source was added at the beginning of anoxic stage, while real-time control was used during the aerobic stage to indicate the completion of nitrification. The results showed that outstanding nitrogen performance was obtained in the experimental period. The COD removal rate of more than 89% and 97% for TN were achieved under the influent COD and TN of 2117.1 mg·L-1 and 305.6 mg·L-1, respectively, which realized the effluent TN concentration below 10 mg·L-1. PHB storing in the anaerobic and feast period of anoxic stage could be used as the internal carbon source for denitrification, which led to the average endogenous denitrification rate of 1.40 mgN·h-1·gVSS-1. Thus, advanced nitrogen removal was realized without extra carbon source addition.