How does septic wastewater differ from fresh wastewater?

Fresh wastewater contains dissolved oxygen, which is crucial for the biological treatment processes commonly used in wastewater treatment facilities. The presence of dissolved oxygen supports the survival and activity of aerobic microorganisms that break down organic matter effectively. This biological degradation process is a key mechanism in treating fresh wastewater, thereby making it easier to manage at treatment plants.

In contrast, septic wastewater typically originates from onsite sewage systems and may have undergone some decomposition and anaerobic processes. As a result, it generally contains lower levels of dissolved oxygen and is often more challenging to treat because the anaerobic conditions can lead to the production of objectionable odors and other complications.

By understanding the importance of dissolved oxygen in the treatment of fresh wastewater, you can appreciate the differences in treatment strategies and challenges posed by septic wastewater. This knowledge is vital for anyone involved in wastewater management and treatment processes.