Device for improving use efficiency of nutritive salt in sewage

The utility model relates to the technical field of high-efficiency nutritive salt devices of water treatment systems, and discloses a device for improving the use efficiency of sewage nutritive salt, which is characterized in that the bottom of a sewage treatment barrel is fixedly connected with support columns which are different in number and are arranged in order, and one side, close to the bottom, of the surface of the sewage treatment barrel is fixedly connected with a control outer shell; a controller is arranged on one side of the surface of the control outer shell, a guide pipe is fixedly connected to the surface of the side, away from the sewage treatment barrel, of the control outer shell, a storage box is fixedly connected to the top of the control outer shell, and a feeding outer shell is fixedly connected to the top of the storage box. The floating ball can rise upwards in the rectangular sliding groove along with the rising of the water surface; a magnetic sensor in a sliding groove formed in t