Simply telephone or write us. We want you to see for yourself that you truly can take your sewer service for granted. Done Technology gives us the capability to treat wastewater so that the processed water can be safely returned to the environment. At the Theresa Street Plant, the activated sludge process and trickling filter system is used for the treatment of wastewater. The activated sludge process gives the best results of all treatment methods.
Wastewater passes through two complete stages of treatment and is also disinfected with chlorine.
The simplified chart at the right and the description omit many of the technical terms and engineering processes involved. However, they will give you a general understanding of how wastewater is treated at the Theresa Street Plant. Preliminary Treatment Area. When wastewater enters the plant, it is passed through mechanical screens and grit chambers. The materials removed are hauled by truck to the landfill.