A pretreatment facility that traps coarse dirt in wastewater. Is a metal frame made of a set of parallel metal grids, placed obliquely on the channel through which the wastewater flows, or at the inlet of the pumping station sump to intercept large blocks of suspended or floating solid contaminants. In order to avoid blocking the drain pipe of the water pump and the sedimentation tank. The interception effect depends on the width of the gap and the nature of the water.
The width of the gap between the grid bars can be set according to the way of removing dirt and the requirements of the water pump. The clearance of the manual cleaning grid is generally 16 to 25 mm. The grate in front of the grit chamber or sedimentation tank is generally 15-30mm and the maximum is 40mm. There are three kinds of commonly used mechanical slag cleaning equipment, namely chain type, mobile type and wire rope traction type grid cleaning machine.
The grid is a group (or groups) of parallel metal grids and frames, which are installed obliquely at the inlet of the water inlet or at the inlet of the water collection station to intercept large suspended solids and impurities in the sewage. To ensure the normal operation of the subsequent processing of structures or equipment.
According to the size of the grating grid spacing, the grid is divided into three types: coarse grid, medium grid and fine grid. According to the slag cleaning method of the grille, there are three kinds of artificial grille, mechanical grille and hydraulic clearing grille. According to the characteristics of the grille structure, it can be divided into various forms such as grabbing, circulating, arc, rotary, drum, rotary, gingival and stepped. The grid equipment is generally used in the inlet channel of sewage treatment or the inlet of the lifting pump station collecting basin. The main function is to remove large suspended or floating materials in the sewage to reduce the processing load of the subsequent water treatment process and play Protect pumps, pipes, instruments, etc. When the amount of grid slag intercepted is greater than 0.2m3/d, mechanical slag removal method is generally adopted; when the grid slag amount is less than 0.2m3/d, manual slag removal method or mechanical slag removal method may be adopted.
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