Secondary Treatment
Wastewater that is not diverted to the Equalization Tank leaves the Flow Distribution Box through the Aeration Tank Influent Channel. The first portion of the channel is underground.  After surfacing at the influent end of the aeration tanks, mixing units are provided to prevent solids from settling in the channel. Valves located along the channel allow wastewater to flow into the aeration tanks. 

Four blowers are available to supply air to the aeration tanks. The air is pumped into the tanks through air diffusers mounted on grids of piping at the bottom of the aeration tanks. This air supplies oxygen to the micro-organisms responsible for converting the suspended solids in the wastewater into settleable solids. The diffused air also mixes the wastewater and helps to regulate the water temperature.

After the micro-organisms in the aeration tanks have converted the suspended solids into settleable solids, the wastewater needs a place where those solids can settle out for removal.  Final Settling Tanks, or Clarifiers, are used for that purpose. In addition to removing a portion of the solids from these tanks, pumps and piping are provided to return the remainder of the solids back to the aeration tanks. This ensures a healthy population of micro-organisms in the aeration process.

 











Next Step: Tertiary Treatment