Solids are separated from liquids in sedimentation tanks during this first step of the wastewater treatment process.
Secondary or biological treatment
Next, oxygen is added to activate the living microorganisms (such as bacteria) that eat the dissolved organic material still in the wastewater. We use what’s called an “activated sludge” treatment process, where the organisms are maintained at a very high level to accelerate the consumption process.
The treated wastewater is then disinfected using either hypochlorite bleach or ultraviolet light to remove pathogenic microorganisms before being returned to the environment.
Some of the wastewater treated at our regional treatment plants is reclaimed water, which must undergo an additional level of filtration and disinfection to meet state environmental and health Class A standards.