A "moving-bed" is a type of filtration system commonly used in wastewater treatment. It consists of a bed of media, such as plastic or ceramic, that moves or tumbles as water flows through it. This movement helps to enhance the contact between the water and the media, allowing for more effective removal of contaminants. In a moving-bed system, microorganisms grow on the media, forming a biofilm that breaks down pollutants. This process is efficient and can handle varying flow rates, making it suitable for different applications, including municipal and industrial wastewater treatment. The technology is often associated with biofilm reactors and aerobic treatment processes.