Question

Explain the function of bar screens in the primary stage of waste
water treatment.

Answer 1

Answer:

Previously, we discussed the main causes of clogged pumps and ways to prevent costly equipment maintenance and replacement. To recap, municipal and industrial wastewater can contain large solids made up of debris, which can damage downstream treatment equipment. One of the ways to remove these solids is to install a wastewater screen. Screens come in a variety of types, shapes, and sizes, but can be broken down into two simple categories: coarse and fine screens.  

Explanation:

Coarse Screens

Coarse screens remove rags, sticks, large solids and other debris ranging from 0.25 to 6 inches. They can be as simple as a trash rack or as complicated as a mechanically cleaned bar screen. Generally speaking, larger treatment facilities will install a mechanically cleaned bar screen whereas small, outdated facilities are likely to use a manually cleaned bar screen.  

Manually cleaned bar screens require little to no mechanical maintenance, but do require routine cleaning by an operator. If you speak with a wastewater operator who works at a facility with a manually cleaned bar screen, I bet he'll tell you that one of his least favorite job duties is cleaning out the bar screen. With that said, the majority of treatment facilities are gravitating towards automated, mechanically cleaned bar screens for the following reasons: