Combined device for sewage deep treatment and treatment method

A combined device for sewage deep treatment which is entirely formed as an open box supported on multiple pillars, wherein:

• the box is partitioned into multiple water treatment units by first partition walls;
• the water treatment unit each consists of two parallel rows of grids, and each row of the grids are partitioned into multiple grids arranged in series by second partition walls;
• outlet tanks are arranged in the middle of the top of the two parallel rows of grids, and each of the outlet tanks is connected to an outlet header pipe;
• the first partition wall has the same height as the box, and both the height of the upper edge of the outlet tanks and the height of the upper edge of the second partition walls between each row of grids arranged in series are smaller than the height of the box;
• the outlet header pipe is connected to a primary outlet branch pipe through a primary two-way electric valve, and the other end of the primary outlet branch pipe is connected to a primary outlet main pipe;
• the outlet header pipe is connected to a secondary outlet branch pipe through a secondary two-way electric valve, and the other end of the secondary outlet branch pipe is connected to a secondary outlet main pipe;
• the primary outlet main pipe is connected to an intermediate tank;
• the bottom of the box at each grid has a tapered configuration, each of which has an unloading door at its bottom, and an inlet coil pipe on which inlet holes are distributed is mounted within each of the tapered configuration;
• one end of the inlet coil pipe passes through the wall of the tapered configuration to be connected with an inlet header pipe, and the other end thereof passes through the wall of the tapered configuration to be connected with a drain valve;
• the inlet header pipe is connected to a primary inlet branch pipe through a primary two-way electric valve, and the other end of the primary inlet branch pipe is connected to a primary inlet main pipe;
• the inlet header pipe is connected to a secondary inlet branch pipe through a secondary two-way electric valve, and the other end of the secondary inlet branch pipe is connected to a secondary inlet main pipe;
• and the primary inlet main pipe is connected to a collecting tank;
• a water blocking tape is arranged in the middle of the first partition wall of the box;
• rails, on which an electrically operated platform is arranged, are arranged at two sides of the top of the box;
• the box is filled with water treating granular carbon;
• both the primary two-way electric valve and the secondary two-way electric valve are connected to a control cabinet.