Research On The Characterisitic Of Biological Aerared Filter And Domestic Sewage Treatment

A bench-scale experimental and theoretical analysis were systematic -ally studied on the biological aerated filter for domestic sewage treatment. The start-up, the removal efficiencies and the operation characteristic of biological aerated filters with two carriers were comparatively analyzed. At the same time, the removal efficiencies and influence factors of two-stage biological aerated filter were also investigated.The experiment showed that the two filters could finish the start-up bio-film formation in short time, the start-up time of the ceramsite carrier 12 days and the zeolite carrier 15 days. The two filters had both preferable removal efficiencies, that the average COD_cr and NH₄⁺-N removal rates of ceramsite carrier were 85%and 87.7% respectively, while the one of zeolite carrier were 81.7% and 91.6% respectively. Different heights of the biological aerated filter had different functions on removal. The degradation of COD_cr mainly occurred in the layer 40cm below and the removal of NH₄⁺-N mainly occurred in the between A bench-scale experimental and theoretical analysis were systematic -ally studied on the biological aerated filter for domestic sewage treatment. The start-up, the removal efficiencies and the operation characteristic of biological aerated filters with two carriers were comparatively analyzed. At the same time, the removal efficiencies and influence factors of two-stage biological aerated filter were also investigated.The experiment showed that the two filters could finish the start-up bio-film formation in short time, the start-up time of the ceramsite carrier 12 days and the zeolite carrier 15 days. The two filters had both preferable removal efficiencies, that the average COD_cr and NH₄⁺-N removal rates of ceramsite carrier were 85%and 87.7% respectively, while the one of zeolite carrier were 81.7% and 91.6% respectively. Different heights of the biological aerated filter had different functions on removal. The degradation of COD_cr mainly occurred in the layer 40cm below and the removal of NH₄⁺-N mainly occurred in the between the kinetic model of for biological aerated filter.