A2N-IC-SBR改进工艺强化脱氮除磷特性

摘要

To solve the problem of the unsatisfactory effluent ammonia concentration in the A2N-IC-SBR (anaerobic/anoxic/nitration-induced crystallization-sequencing batch reactor) process, improvement measures were taken. Nutrient removal performance was investigated in the improved system. Ammonia removal rates increased significantly without any negative effect on phosphorus removal. After the improvement measures, effluent ammonia, total nitrogen and total phosphorus all reached the Chinese National Sewage Discharge Standard Class I (grade A) level. Compared with A2N-IC-continuous flow process, obvious advantage of enhancing phosphorus recovery was noticed. Calcium could be added continuously and evenly during the chemical phosphorus recovery reaction stage, benefiting heterogeneous precipitation. And plate-shaped crystallization product was formed on the seeds.%针对A2N-IC-SBR工艺中部分出水氨氮不能达标的问题，提出改进方案，并考察了改进方案下A2N-IC-SBR工艺的脱氮除磷性能。结果表明：改进方案可以大幅提高氨氮去除率，且不会影响出水磷浓度。氨氮、总氮、总磷出水浓度均能够达到GB 18918-2002一级A标准。与连续流A2N-IC工艺相比，A2N-IC-SBR在强化磷回收方面具有明显优势：采用了连续均匀投加钙盐的方式，有利于非均相结晶，产生了片状的钙磷结晶体。