What is the purpose of a bar screen in headworks?

• A. To Remove Large Solids Before Pumps And Downstream Equipment To Prevent Damage And Clogs
• B. To Measure Flow Rate
• C. To Add Chlorine
• D. To Aerate The Inflow

Answer: (A)

Bar screens in the headworks are placed to remove large solids from incoming wastewater before it reaches pumps and downstream equipment. By catching big items like plastics, rags, and debris, they prevent damage, jams, and clogs in pumps, pipes, and subsequent treatment units, which helps the system run smoothly and with less maintenance. The screen uses vertical bars with gaps that block large solids while letting water pass, and the collected debris is removed periodically by a rake or automatic cleaner. After this initial screening, water moves on to grit removal and other pretreatment steps. Other tasks like measuring flow, adding chlorine, or aerating occur at different stages, not at the headworks.