Which chemical is listed as a coagulation aid?

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Multiple Choice

Which chemical is listed as a coagulation aid?

Coagulation aids are chemicals added to help the coagulant work more effectively by adjusting the water’s pH and alkalinity to the range where particle charge neutralization and floc formation are optimized. Sodium hydroxide is a strong base used to raise pH quickly to about the optimal window for coagulation, which improves the breakup of colloids and promotes larger, settleable flocs. This makes it a common choice as a coagulation aid. Lime also raises pH and is used in many treatment schemes, but sodium hydroxide is the more direct and rapid method for achieving the needed pH balance during coagulation. Sulfuric acid would lower pH, which can reduce coagulation efficiency, and sodium carbonate is typically used for alkalinity adjustment and hardness control rather than as the primary coagulation aid.

Coagulation aids are chemicals added to help the coagulant work more effectively by adjusting the water’s pH and alkalinity to the range where particle charge neutralization and floc formation are optimized. Sodium hydroxide is a strong base used to raise pH quickly to about the optimal window for coagulation, which improves the breakup of colloids and promotes larger, settleable flocs. This makes it a common choice as a coagulation aid.

Lime also raises pH and is used in many treatment schemes, but sodium hydroxide is the more direct and rapid method for achieving the needed pH balance during coagulation. Sulfuric acid would lower pH, which can reduce coagulation efficiency, and sodium carbonate is typically used for alkalinity adjustment and hardness control rather than as the primary coagulation aid.

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