| 摘要 |
The invention relates to a biological filtration device that clears away nitrogen and phosphorus in domestic sewage at the same time, and belongs to the technical field of sewage treatment. According to the biological filtration device that clears away nitrogen and phosphorus in domestic sewage at the same time provided by in the invention, a first filtering layer and a second filtering layer are formed inside a biological reaction groove of the biological filtration device, an air injection tube is arranged under the first and second filtering layers, sewage entering the biological reaction groove through an water inlet tube is dephosphorized in the first filtering layer, and nitrogen and phosphorus and organic matter are removed in the second filtering layer to finish complete filtering, preventing rivers, oceans or soil from being polluted. |
