The correct answer is: A. Reducing the excessive flow in sewers.
Lagooning is a wastewater treatment process that uses natural processes to remove organic matter and nutrients from wastewater. It is a relatively simple and inexpensive process that can be used to treat a wide variety of wastewaters.
Lagoons are typically large, shallow ponds that are lined with clay or plastic to prevent seepage. The wastewater is held in the lagoon for a period of time, during which time it is exposed to sunlight and aerobic bacteria. The sunlight helps to kill pathogens, while the bacteria break down the organic matter.
Lagoons are often used in conjunction with other wastewater treatment processes, such as primary treatment or secondary treatment. They can also be used to treat industrial wastewaters.
Here is a brief explanation of each option:
- Option B: Lagooning is not a primary means of sludge disposal. Sludge is typically disposed of by landfilling, incineration, or composting.
- Option C: Lagooning is not a primary means of increasing the capacity of storage reservoirs. Storage reservoirs are typically used to store water for drinking, irrigation, or industrial purposes.
- Option D: Lagooning is not a primary means of increasing the flow of sewage through imhoff tanks. Imhoff tanks are a type of primary treatment process that is used to remove solids from wastewater.