Research on DN-PN/A coupled treatment of low ammonia nitrogen electroplating tail water
ZHANG Yu1, LI Jia-yi1, YANG Jun-feng1, ZHOU Song-wei2, WANG Xiao-jun1
1. School of Environment and Energy, South China University of Technology, Guangdong Guangzhou 510006, China; 2. Hua An Biotech Co., Ltd., Guangdong Foshan 528300, China
Abstract：A pilot-scale continuous-flow denitrification partial nitrification-anaerobic ammonia oxidation (Anammox) multi-unit reactor was constructed to treat the electroplating tail wastewater. The pre-denitrification reactor demonstrated total inorganic nitrogen (TIN) and chemical oxygen demand (COD) removal efficiencies of (29.96±10.37)% and (73.33±9.6)%, respectively, with substantial removal of soluble organics to reduce pollutant loads in subsequent processes. The partial nitrification reactor confirmed that the zeolite packing method effectively achieved stable partial nitrification, yielding a nitrogen accumulation rate of (87.73±22.28)%. During long-term operation, it will be affected by scale, and its performance can be restored after scale removal. The Anammox reactor, as the primary nitrogen removal stage, maintained a TIN removal efficiency of (41.25 ± 14.46)% even during partial nitrification instability, relying on the cooperative effects of ammonia-oxidizing bacterium (AOB), denitrifying bacteria (DNB), and anammox bacteria (AnAOB). High-throughput sequencing identified Nitrosomonas (AOB), in the partial nitrification reactor, with a relative abundance of 5.45%, and Candidatus Anammoglobus (AnAOB), with a relative abundance of 25.91%. These findings provide both theoretical and practical foundations for applying the Anammox process in engineering contexts.
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