Basic Wastewater Operator Practice Exam

What is the purpose of a grit chamber in wastewater treatment?

1. To remove floating solids

2. To separate heavy particles from the wastewater

3. To enhance biological treatment

4. To disinfect the wastewater

The correct answer is: To separate heavy particles from the wastewater

The purpose of a grit chamber in wastewater treatment is to separate heavy particles, such as sand, gravel, and other inorganic materials, from the wastewater. These particles tend to settle quickly due to their higher density compared to the organic materials present in the wastewater. By allowing these heavier solids to settle at the bottom of the chamber, the grit chamber effectively removes them from the influent flow before it enters further treatment processes. This separation is crucial for protecting downstream equipment, such as pumps and aeration tanks, from abrasion and clogging, thereby enhancing the efficiency and longevity of the wastewater treatment system. The other options focus on processes and components that are not the primary function of a grit chamber. Floating solids are typically addressed in different parts of the treatment process, biological treatment occurs in activated sludge or similar processes, and disinfection is performed as a final stage of treatment to eliminate pathogens.