Ontario Operator-in-Training (OIT) Practice Exam

What takes place during the dewatering process of sludge?

1. It becomes completely dried out

2. Water is removed from the sludge

3. All organic material is destroyed

4. It is solidified into bricks

The correct answer is: Water is removed from the sludge

During the dewatering process of sludge, the primary goal is to remove water from the sludge. This process significantly reduces the volume of the sludge, making it easier to handle and transport. The removal of water enhances the concentration of solids in the sludge, which is important for further treatment processes or disposal. While the process does not eliminate all water or fully dry out the sludge, it does lead to a significant reduction in moisture content. As a result, dewatering typically results in a material that is far less wet than the initial sludge but not transformed into a completely dry substance or solidified into any specific shape like bricks. Understanding the dewatering mechanism is crucial for operators as it sets the stage for subsequent treatment or disposal processes, ensuring compliance with regulatory standards and efficiency in waste management.