What effects does properly dosed activated silica have on coagulation?

Properly dosed activated silica plays a beneficial role in the coagulation process, particularly by widening the pH range for effective coagulation. When activated silica is added to a water treatment system, it acts as a coagulant aid. This means that it enhances the performance of primary coagulants, allowing them to work more effectively across a broader range of pH levels.

This property is crucial because the effectiveness of many coagulants, such as alum, can be heavily influenced by the pH of the water. By using activated silica, the treatment facility can maintain effective coagulation even if the pH fluctuates — which may occur due to varying water sources or seasonal changes. This adaptability can lead to improved particle removal and better overall water quality, making it a valuable tool in drinking water treatment processes.