WWTP Tour - Primary Treatment
Bar Screens

Screening precedes all other treatment processes on the Wastewater Treatment Plant. The removal of coarse solids achieved through screening provides protection to all equipment, pipes and channels in the treatment plant. Raw wastewater from the collection system enters the screen chamber. The wastewater then flows through the bar screen where large materials, such as sticks, rocks, and rags, are removed in order to protect the downstream equipment from being damaged. The screening facilities are. located in an enclosed building where the atmosphere is continuously scrubbed for odor control.

A screen is a device with openings placed in a channel such that the wastewater flows through while the solids are caught on its upstream side. Our screens consist of parallel bars arranged in the form of a rack, also known as a bar screen. Flow of wastewater through the bar screen is generated by gravity. The bar screen is mechanically cleaned by a traveling rake which pulls the debris out of the channel and into a container. Screenings are periodically hauled by truck from the site for ultimate disposal by burial. From the bar screen the wastewater flows by gravity to the grit chambers.