The water head loss across the grate cleaner refers to the difference in water levels before and after the grate, which is related to the velocity of water passing through the grate. If the water head loss across the grate increases, it indicates an increase in the velocity of water passing through the grate. At this point, it is likely that the volume of water passing through the grate has increased, or more likely, the grate is partially blocked, necessitating immediate cleaning. A decrease in water head loss across the grate suggests a reduction in the velocity of water passing through, and precautions should be taken to prevent sand accumulation in the approach channel before the grate.

The格栅cleaning machines are available in two types: manual and mechanical. To prevent the toxic effects of pollutants on humans, reduce the labor intensity of workers, improve operational efficiency, and achieve automated control, mechanical grates should be preferred as much as possible. When wastewater contains oils and other substances that can release volatile flammable gases, the power unit of the mechanical grate should be equipped with explosion-proof devices. The specific type and material of the grate should be determined based on the characteristics of the wastewater, such as pH levels and the size of solids.

A large-scale wastewater treatment plant typically requires two sets of grates and one screen. The spacing of the grate bars should be determined based on factors such as the type and flow rate of the wastewater, representative debris types and sizes, and must meet the requirements of the pump structure as well as the subsequent water treatment structures and equipment. The first stage uses coarse grates (50~100mm) or medium grates (20~40mm), the second stage uses medium or fine grates (4~10mm), and the third stage is a screen (less than 4mm).