The "head loss of water passing through the grille cleaner" refers to the difference in water levels before and after the grille, which is related to the flow velocity through the grille. If the head loss of water passing through the grille increases, it indicates that the flow velocity through the grille has increased. At this point, it is possible that the amount of water passing through the grille has increased, or more likely, the grille is partially blocked, and it needs to be cleaned promptly. If the head loss of water passing through the grille decreases, it suggests that the flow velocity through the grille has decreased, and measures should be taken to prevent sand accumulation in the approach to the grille.

The格栅cleaning machines are available in two types: manual and mechanical格栅. To prevent the toxic effects of pollutants on humans, reduce the labor intensity of workers, improve operational efficiency, and achieve automated control, it is advisable to opt for mechanical格栅whenever possible. When wastewater contains oils and other substances that can release volatile flammable gases, the power unit of the mechanical格栅should be equipped with explosion-proof devices. The specific type and material of the格栅 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格栅 and one set of screen. The spacing of the格栅 bars should be determined based on factors such as the type of wastewater, flow rate, types and sizes of representative debris, and other considerations, ensuring both the requirements of the pump structure and the subsequent requirements of water treatment facilities and equipment are met. The first stage uses coarse格栅 (50~100mm) or medium格栅 (20~40mm), the second stage uses medium格栅 or fine格栅 (4~10mm), and the third stage is a screen (〈4mm).