What device is used to retain or remove suspended or floating objects in wastewater treatment?

The device used to retain or remove suspended or floating objects in wastewater treatment is a screen. Screens are designed to capture larger debris, such as leaves, plastic, and other solid materials, before the wastewater moves on to the next stages of treatment. By doing so, screens help prevent damage to downstream equipment and ensure that the treatment process operates more efficiently.

Screens can vary in design, including bar screens, mesh screens, and rotary drum screens, each tailored to effectively trap different sizes and types of solids. This initial step in the treatment process is crucial for maintaining the quality of the wastewater and supporting the overall effectiveness of the treatment plant.

In contrast, filters are generally used to remove smaller particles and impurities after screening, sediment tanks focus on settling out heavier solids by gravity, and comminutors are more concerned with shredding larger objects into smaller pieces rather than retaining or removing them.