What does a density current in a clarifier indicate?

A density current in a clarifier indicates a difference in density affecting flow. This phenomenon occurs when water with different properties, such as temperature or suspended solids concentration, enters a basin or clarifier. As heavier, denser water tends to sink and lighter water rises, this creates a current driven by the variations in density.

In the context of water treatment, understanding density currents is essential because they can impact the efficiency of the clarification process. If one layer of water is significantly denser, it may lead to stratification, affecting the overall treatment effectiveness by inhibiting proper sedimentation of particulates. This knowledge is crucial for operators to maintain optimal performance in clarifiers, ensuring that the treatment process proceeds smoothly and efficiently.