What is the purpose of a doctor blade on a rotating screen?

The role of a doctor blade on a rotating screen is primarily to clean the screen as it rotates. This cleaning action is crucial because it helps maintain the screen's effectiveness in filtering out solids from the wastewater stream. As the screen rotates, solids can accumulate on the surface, potentially reducing its efficiency. The doctor blade scrapes off these solids, preventing clogging and ensuring that the mesh remains clear for optimal operation. This function is essential in applications where consistent and efficient filtration is required to maintain the quality of the effluent and the overall performance of the water treatment system.