Sewage Treatment Worker Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Anaerobic digestion is a widely used method for sludge stabilization due to its efficiency in breaking down organic material in the absence of oxygen. This process involves microorganisms that thrive without oxygen, decomposing the complex organic compounds found in sludge into simpler molecules. The primary outcome of anaerobic digestion is the production of biogas, which primarily consists of methane and carbon dioxide. This biogas can be utilized as a renewable energy source, providing both economic benefits and reducing greenhouse gas emissions.

In addition to energy recovery, anaerobic digestion also reduces the volume of sludge, making it easier and more cost-effective to handle and dispose of the remaining materials. The process not only stabilizes sludge but also can enhance odor control and reduce pathogens, leading to a safer end product.

While other methods for sludge stabilization exist, anaerobic digestion is particularly valued for its dual benefit of waste reduction and energy production, making it a common choice in sewage treatment facilities.