What device is typically required to hold water temporarily after aeration or addition of an oxidant?

• A. Filtration system
• B. Detention or contact chamber
• C. Settling tank
• D. Pump station

Answer: (B)

The appropriate device for holding water temporarily after aeration or the addition of an oxidant is a detention or contact chamber. This type of chamber allows for sufficient time for the oxidant to react with contaminants in the water, ensuring that the treatment processes are effective before the water moves on to the next phase of treatment.

Detention or contact chambers are designed to provide a controlled environment where the necessary reactions can occur, enhancing overall water quality. This chamber serves a crucial role in reducing the concentration of pollutants and improving the efficacy of treatment by allowing adequate contact time between the water and additives.

In contrast, while filtration systems are essential in removing particulates and impurities, they are not specifically designed for holding water temporarily after the addition of oxidants. Settling tanks focus on sedimentation processes and are primarily used for removing heavier solids, rather than ensuring adequate reaction time for oxidants. Pump stations facilitate the movement of water but do not provide the necessary time for chemical reactions to occur. Thus, the detention or contact chamber is the specialized solution for the scenario described.