Removal of Ammonia Nitrogen in Biological Aerated Filter (BAF) Filled with Smaller Ceramsite Particles

The smaller ceramsite particles were selected to be filled in a biological aerated filter (BAF) to remove ammonia nitrogen from the synthetic wastewater which did not contained COD. The effect of the filter layer, the inner reflux ratio and the ceramsite particle on the removal rate of ammonia nitrogen in the wastewater was investigated in the present study. The results indicated that the steady removal rate of eighty-eight percent was excitingly detected after the 24 days of the biofilm formation, and both the low and middle filter layer showed the removal rate of the wastewater ammonia nitrogen higher than the top layer. In addition, in the present study, the best inner reflux ratio of the present smaller-ceramsite BAF could be steadily kept in case of the slight fluctuation of the ceramsite size and the organic concentration of the wastewater.