What is the optimal pH range for using alum in water treatment?

Study for the Water Treatment Class E Test. Prepare with flashcards and multiple choice questions, each question features hints and explanations. Get ready for your certification exam!

The optimal pH range for using alum in water treatment is between 5.8 and 8.5. Within this pH range, alum, which is aluminum sulfate, is most effective in destabilizing colloids in water, allowing for efficient coagulation and subsequent sedimentation. The mechanism relies on the formation of aluminum hydroxide, which occurs as the pH increases and helps to attract and bind with suspended particles. Below a pH of 5.8, aluminum can dissolve in a way that hampers its coagulating ability, while above 8.5, the formation of aluminum hydroxide becomes less efficient due to changes in solubility and precipitation behavior. This balance is crucial for maximizing the treatment process and ensuring water quality.

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