Fairfield is preparing for improvements to its wastewater treatment plant’s aeration system, which ensures the city continues to meet all state and federal environmental requirements. Hazen and Sawyer ...

Several flow systems for use with the step aeration process were examined under optimal operating conditions: completely-mixed tanks-in-series systems, plug-flow systems, and a composite of the two.

Turning sewage into something clean enough to release into a river requires multiple stages of treatment. And before groundwater, reservoir water or river water can be used as drinking water, it must ...