1. Influent water quality, grid flow and grid status;

2. Depth, width and speed of grid wells;

3. The grille of the grille cleaner can be divided into fine grille and coarse grille. The rake tooth grid gap is divided into 1 mm, 3 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm and other specifications. The gap of the grid is determined according to the type and flow of sewage, and the type and size of representative debris. The commonly used selection ranges are as follows: Mechanical grid cleaning: 3 ~ 25 mm; Manual grid cleaning: 5 ~ 15 mm; Screen: 0.1~2mm. For example, large and medium-sized sewage stations should be equipped with two mechanical grilles: one is a coarse grille: 10~40mm, and the other is a fine grille: 3~10~40mm (large sewage treatment plants are 15mm+4mm combination). In a small sewage station, it is enough to set a grid with a grid spacing of 3 to 15 mm (a manual grid of 15 mm and a mechanical grid of 5 mm can be used for coarse grids).

4. The material and variety of the grille can be determined according to the water quality and depth. The width of the grid can be calculated according to the flow rate, the speed of passing the grid and the angle of the device, and the gap between the grid bars can be determined according to the application state of the grid.

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