What is the primary purpose of a manually cleaned bar screen?

• A. To remove large solids and protect downstream equipment
• B. To measure flow rate
• C. To aerate wastewater
• D. To disinfect water

Answer: (A)

Bar screens are designed to remove large solids from incoming wastewater to protect downstream equipment. When a bar screen is manually cleaned, an operator periodically removes the accumulated debris, preventing clogs and damage to pumps, grit chambers, and other pretreatment components. This function is about protection and reliability of the treatment process, not measuring flow, aerating the water, or disinfecting it. Flow rate is measured with meters or weirs, aeration introduces air for biological treatment, and disinfection uses chemicals or UV to kill pathogens. So the primary purpose is to remove large solids and protect downstream equipment.