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

The role of a grit chamber in wastewater treatment is to remove heavy solids such as sand, gravel, and other coarse materials that may be present in the wastewater. These materials can potentially damage equipment or hinder the efficiency of the subsequent treatment processes.

When wastewater enters the grit chamber, the flow velocity is controlled to allow these heavier solids to settle out due to gravity, while lighter organic materials, such as food particles and oils, remain suspended in the water. This process helps to ensure that the wastewater treatment system operates efficiently and reduces wear and tear on pumps and other mechanical equipment.

The other options focus on functions that are not carried out by a grit chamber. For instance, increasing oxygen levels is a role typically associated with aeration processes, while disinfection is achieved through other methods such as chlorination or UV treatment. Nutrient removal, particularly for nitrogen and phosphorus, is generally addressed in later stages of treatment, involving specialized processes.