Village Creek uses conventional activated sludge as the heart of its treatment process. A biological treatment begins, which mimics the processes used by nature for purifying lakes and streams.
The process principle is to biologically convert pollutants that will not settle into substances that will settle. The wastewater is mixed with bacteria rich “activated sludge” in large aeration basins. Compressed air is fed through fine bubble diffusers to provide the bacteria and other microorganisms with enough oxygen to support the biological process in the wastewater. In fact, the bacteria “eat” organic matter in the wastewater. The process is controlled to minimize biological “burning up” of organic material.
Dissolved and suspended impurities in the wastewater are incorporated into the activated sludge floc through adsorption (when solids stick to the surface of the bacteria) and absorption (when dissolved gases and solids are taken into the bacteria where they can be assimilated) by the microorganisms.
Then the mixture of treated wastewater and activated sludge from the aeration basins is transferred to final clarifiers, where gravity separates the microorganisms from the wastewater. The clarified wastewater again overflows the clarifier weirs and moves on to the effluent filtration phase.
Most of the settled activated sludge is returned to the aeration basins to continue the treatment process. The remainder is pumped to Waste Sludge Concentration. Scum floating on the surface of the final clarifiers is removed and incinerated.