Which factor is not a contributor to grease buildup in a sewer?

Which factor is not a contributor to grease buildup in a sewer?

• A. inorganic wastewater
• B. low velocity
• C. dip in pipe
• D. bad grade

Answer: (A)

Grease buildup in sewers comes from fats, oils, and grease becoming part of the wastewater and then sticking to the pipe walls when flow slows. The factors that promote this are conditions that reduce velocity, like a dip in the pipe or a bad grade, which create pockets where fats can separate from the liquid and settle out. Low velocity itself lets the fatty substances cling to surfaces rather than being swept away. Inorganic wastewater, on the other hand, doesn’t introduce fats or oils to form a greasy deposit, so it doesn’t contribute to grease buildup. It may carry other solids, but those don’t create the greasy film that leads to blockages.

Grease buildup in sewers comes from fats, oils, and grease becoming part of the wastewater and then sticking to the pipe walls when flow slows. The factors that promote this are conditions that reduce velocity, like a dip in the pipe or a bad grade, which create pockets where fats can separate from the liquid and settle out. Low velocity itself lets the fatty substances cling to surfaces rather than being swept away.

Inorganic wastewater, on the other hand, doesn’t introduce fats or oils to form a greasy deposit, so it doesn’t contribute to grease buildup. It may carry other solids, but those don’t create the greasy film that leads to blockages.