The格栅cleaning machine's head loss across the grille refers to the difference in water levels before and after the grille, which is related to the velocity of water passing through. If the head loss across the grille increases, it indicates an increase in the velocity of water passing through, suggesting that either the amount of water passing through has increased or more likely, the grille is partially blocked, and it requires immediate cleaning. Conversely, a decrease in head loss across the grille means the velocity of water passing through has decreased, and precautions should be taken to prevent sand accumulation in the path before the grille.

Grate cleaners are available in two types: manual and mechanical grates. To prevent the harmful effects of pollutants on humans, reduce labor intensity, improve operational efficiency, and achieve automated control, it is advisable to opt for mechanical grates as much as possible. When wastewater contains oils and other substances that can release flammable volatile 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 the pH level and the size of the 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 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 (〈4mm).