Tennessee Wastewater Operator Practice Exam

In digesters with floating covers, what is the function of corbels?

1. Enhance mixing of contents

2. Prevent the cover from damaging internal equipment

3. Support the biogas collection system

4. Regulate temperature within the digester

The correct answer is: Prevent the cover from damaging internal equipment

Corbels play a critical role in digesters with floating covers by serving as structures that prevent the cover from damaging internal equipment. These supports help to maintain a safe distance between the cover and the digester's walls and internal features, ensuring that moving parts or components are not unintentionally impacted by the floating cover’s movements. The floating cover is designed to rise and fall with the changing levels of the sludge or waste material within the digester. Without corbels, the cover could potentially exert pressure or collide with sensors, mixers, or other essential equipment within the digester, leading to mechanical failure or operational issues. Understanding the design and supports within a digester, like corbels, reinforces the importance of maintaining the integrity of both the digester and its operational equipment. This illustrates how features are engineered to work harmoniously in wastewater treatment processes.