The fan grille is the main auxiliary equipment in the sewage pumping station when it is used. When it is used, its grille is generally composed of a set of parallel grid bars, which are placed obliquely at the inlet of the pumping station sump. The angle of inclination is 60°~80°. After the grid, a workbench should be set up. The workbench should generally be 0.5m above the high water level upstream of the grille. For the artificial slag grid, the length of the workbench along the water flow direction is not less than 1.2m, the length of the mechanical slag grid is not less than 1.5m, and the width of the aisles on both sides is not less than 0.7m.
The pollutants in the sewage in the fan grille generally exist in three forms, and are mainly suspended (including floating) state, colloidal state and dissolved state during operation. The physical treatment of sewage mainly consists of suspended solids and partial colloids that may block the pump impeller and pipeline valves and increase the load of the subsequent treatment unit. Therefore, the physical treatment of sewage is generally referred to as solid-liquid separation treatment of wastewater. In principle, wastewater solid-liquid separation is mainly divided into two categories: one is that the wastewater is subject to certain restrictions, the suspended solids are removed in the water, and the other is that the suspended solids are subject to certain restrictions, and the wastewater flows to suspend the solids. abandon. The grille belongs to the latter. The grille is the main auxiliary equipment in the sewage pumping station. The grid is generally composed of a set of parallel grids that are placed obliquely at the inlet of the pumping station sump.