Describe screening and grit removal as early stages of sewage treatment.

In the subtopic Waste water treatment, this learning objective focuses on describe screening and grit removal as early stages of sewage treatment. Within Using the Earth's resources and obtaining potable water, students should explain this idea in the exact curriculum context rather than as an isolated fact. Approved keywords for this objective include sewage, screening, and grit removal. screening means the process of removing large solids and debris from sewage before further treatment. Avoid students often confuse screening and grit removal with the later stages of sewage treatment, thinking they are part of the biological treatment process; instead remember that screening and grit removal are initial steps that focus on removing large solids and grit before biological treatment occurs. For exam answers, memorize the steps involved in sewage treatment, particularly screening and grit removal, as they are crucial early stages.