Structural vanadium and chromium in lateritic iron oxides: Genetic implications
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The study focuses on decarbonization and nitrification theory and parameters of Anoxic-Aerobic BAF techniques.The impact of COD,NH3-N and TN removal performance were established considering hydraulic loading.The test result indicated that anoxic section of Anoxic-Aerobic BAF was vital for COD,NH3-N and TN removal.In order to obtain the best processing effect,the anoxic section must maintain the height scope of 500-600mm.When the Anoxic-Aerobic BAF hydraulic loading was 2-3 m/h,the ratio of the anoxic section volume to the aerobic one was 1:3,and the COD,NH3-N and TN have the best removal effect.The conclusion is that the increase of the hydraulic loading of Anoxic-Aerobic BAF leads more dissolved oxygen to anoxic section with the backflow intermixture and enhances the water perturbation in filters,strengthens reaerationon in the column,destroys the anoxic section filters in the column.It is disadvantageous to the denitrification and the total nitrogen removal.
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