What is the purpose of a venturi in a sewage treatment plant?

A venturi in a sewage treatment plant is specifically designed to measure the flow of sewage. The venturi effect utilizes a constricted flow path that causes a decrease in pressure, allowing for the calculation of flow rate based on changes in fluid velocity and pressure. By determining these parameters, plant operators can effectively monitor and control the treatment processes, ensuring that they are functioning as intended and managing the sewage efficiently. This measurement is crucial for maintaining optimal operational conditions and ensuring compliance with environmental regulations.

In contrast, other functions suggested, such as cleaning diffusers, controlling sewage levels, or reducing gas pressure, do not directly align with the primary role of a venturi, which is focused on flow measurement.