What is the function of a check valve in a wastewater lift station?

The function of a check valve in a wastewater lift station is crucial for ensuring the proper flow of wastewater through the system. Specifically, a check valve is designed to prevent backflow, which is the unintended reversal of flow in a pipeline. This backflow can occur during situations such as a loss of pump suction or pressure fluctuations within the system. By preventing backflow, the check valve helps maintain the integrity of the wastewater system, protecting against potential contamination and ensuring that the wastewater moves efficiently from the collection point to the treatment facility.

In contrast, other options present functions that are not core to the role of a check valve. Measuring flow rate is typically accomplished through flow meters, while filtering solid waste is the job of screens or grit traps. Regulating pressure is managed through pressure sensors and valves, rather than check valves. Thus, the primary and most accurate function of a check valve in this context is to prevent backflow of wastewater.