Study on Anti-Ammonia Load Capacity of Zeolite-Ceramics Biological Aerated Filter (Z-C BAF)

Abstract

The anti-ammonia shock load capacity of zeolite-ceramics biological aerated filter is studied. It is turned out that anti-ammonia shock load process can be divided into two processes of absorption and release, during which the effluent ammonia nitrogen concentration is always less than 4mg/L. In adsorption process, the ammonia nitrogen removal mainly occurs in the 0~35cm zeolite layer, accounting for 84% of total removal rate, adsorption of zeolite accounting for 96.15% of total ammonia removal. In the release process, ammonia nitrogen concentration increases firstly and then decreases along the filter. Along with the time the peak of NH3-N moves from the headpiece to the bottom of the filter, and gradually decreases. 4h after the shock load, the effluent ammonia nitrogen concentration returns to normal level. This indicates that the zeolite-ceramic BAF can withstand short-term ammonia nitrogen shock load and operate long-term. The column height, influent ammonia nitrogen concentration and flow rate can affect the dynamic adsorption process of ammonia nitrogen. BDST model can be used to predict column height Z and penetration time t at different flow rates.