Moving bed biofilm reactors (MBBR) are a type of wastewater treatment technology that uses small plastic carriers, or media, to support the growth of microorganisms. These microorganisms form a biofilm on the media, which helps break down organic pollutants in the water. The media is kept in constant motion by the flow of water, allowing for efficient contact between the biofilm and the wastewater. MBBR systems are often used in municipal and industrial applications due to their compact design and ability to handle varying loads. They can be integrated with other treatment processes, such as activated sludge systems, to enhance overall performance and improve water quality.