Florida Wastewater Practice Test

What is the primary benefit of using anaerobic digestion in wastewater treatment?

1. Reduction of sludge volume

2. Increase of solid waste disposal

3. Lower operational costs

4. Maximum nutrient recovery

The correct answer is: Reduction of sludge volume

The primary benefit of using anaerobic digestion in wastewater treatment is the reduction of sludge volume. This process involves microorganisms breaking down organic matter in the absence of oxygen, which not only stabilizes the waste but also significantly lowers its mass. By reducing the volume of sludge produced, anaerobic digestion minimizes the costs and requirements associated with sludge handling, transportation, and disposal. Additionally, the digestion process converts organic materials into biogas, which can be captured and utilized as a renewable energy source. This not only enhances sustainability but also supports operations by providing an alternative energy source. The reduction of sludge volume is critical in wastewater treatment, as it helps manage waste efficiently and can also lead to valuable by-products, such as nutrient-rich digestate, which can be used as fertilizer. While the other options have some merit, they do not capture the primary and most significant advantage of anaerobic digestion as effectively as sludge volume reduction does.