What is the distance between the bars in a BOR screen?

In the context of wastewater treatment, a bar screen is a crucial component used to protect downstream equipment by capturing larger debris before it enters the treatment process. The distance between the bars in a bar screen, specifically a BOR (Bar Overscreen Rake) screen, is typically designed to effectively filter out unwanted materials while allowing water to flow through.

The correct answer indicates a distance of 1/4 to 2 inches between the bars. This range is considered optimal because it strikes a balance between allowing sufficient water flow through the screen while effectively capturing larger solids, including leaves, sticks, and other debris that might harm pumps and other equipment. The wider spacing allows for some flexibility in capturing various sizes of debris without significantly compromising the hydraulic performance of the system.

In practical terms, if the spacing were too small, it could lead to clogging and an increase in maintenance needs, while spacing that is too large would allow more debris to pass through, potentially causing issues downstream. Therefore, the range of 1/4 to 2 inches is appropriate for ensuring that the bar screen functions effectively in a wastewater treatment facility.