Ash ponds are primarily used in power plants to:

Ash ponds are primarily used in power plants to:

• A. Use gravity to settle out large particulates in wastewater
• B. Filter out dissolved minerals
• C. Heat exchange with flue gases
• D. Store ash

Answer: (A)

Ash ponds rely on gravity-based solid–liquid separation. They collect wastewater that contains ash particles from the plant, and the heavier, larger particles settle toward the bottom to form a sludge layer. The water that remains on top becomes clearer and can be reused or discharged under proper environmental controls. This settling process specifically targets particulate matter, whereas dissolved minerals stay in solution and aren’t removed by settling. Heat exchange with flue gases isn’t a function of ash ponds, and while storing ash is a role of ash ponds, the key purpose related to wastewater management is to let gravity settle out the large particulates before the water is handled further.

Ash ponds rely on gravity-based solid–liquid separation. They collect wastewater that contains ash particles from the plant, and the heavier, larger particles settle toward the bottom to form a sludge layer. The water that remains on top becomes clearer and can be reused or discharged under proper environmental controls. This settling process specifically targets particulate matter, whereas dissolved minerals stay in solution and aren’t removed by settling. Heat exchange with flue gases isn’t a function of ash ponds, and while storing ash is a role of ash ponds, the key purpose related to wastewater management is to let gravity settle out the large particulates before the water is handled further.