The Study on the Removal of Ammonia Nitrogen in Wastewater by Thin Film Coating Photo-Catalytic Oxidation Process

A new process for advanced wastewater treatment process has been devised with auxiliary treatment unit employing the ammonia oxidizing photo-catalytic thin film. In winter time, due to low water temperature, conventional nitrogen removal treatment experiences almost no nitrification by nitrifying bacteria. To solve the problem and to meet the governmental effluent guideline the treated water has been recycled through the auxiliary unit in which the auxiliary system was applied with the thin film coating photo-catalyst. This study also identifies the characteristics of the thin film coating-photo-catalyst through XRD, SEM and analyzes the ammonia nitrogen removal efficiency by using the thin film coating photo-catalyst in the reactor which resembles a sewage treatment process. The evaluation of the entire process of biological treatment in accord with the application of thin film coating photo-catalyst was performed through computer simulation. A relevant computer model for mass balance was made and utilized to select proper optimal operating condition such as recycle ratio. Result shows the proposed new process has potential applicability to renovate existing treatment plants.