What is the function of a clearwell in water treatment?

The function of a clearwell in water treatment is primarily to store water after it has been filtered. This storage component is crucial as it helps to provide a buffer of treated water before it is distributed to the end-users. The clearwell allows for the water to settle and for any residual coagulants or chemicals from the treatment process to be adequately mixed and dispersed. It also serves to provide a consistent supply of treated water during peak demand periods, effectively helping to manage varying flow rates through the treatment process.

The other functions described in the options do not align with the specific role of a clearwell. For example, sediment removal occurs in sedimentation basins, rather than in a clearwell, which focuses on post-treatment storage. Aeration, which is meant to enhance water quality by increasing oxygenation or removing dissolved gases, typically occurs in aeration basins. Additionally, the addition of coagulants is performed during the coagulation phase of treatment, prior to filtration, and is not a function of the clearwell. Thus, the clearwell's primary responsibility is to hold the treated water safely and efficiently until it is ready for distribution.