Site Plan & Process Description
The city's water reclamation facility receives raw wastewater into it's influent structure, where it is passed through the trash and grit removal process.
Next this pretreated wastewater is pumped into two separate extended aeration basins and brought into contact with microscopic organisms in the form of returned activated sludge (RAS).
This RAS is then mixed with the activated sludge (AS) in the aeration basins.
From here the activated sludge (AS) flows by gravity to settling basins called clarifiers.
As the activated sludge (AS) settles to the bottom of the clarifiers the organism's continue to breakdown the organic matter, which was initiated in the aeration basins.
As the activated sludge (AS) settles, clear water is removed from the surface of the clarifiers and is sent to a chlorine contact chamber for disinfesting and disposal at the City's effluent irrigation facility.
After the activated sludge (AS) has settled in the clarifiers it is drawn from the bottom and sent back to the head of the aeration basins as returned activated sludge (RAS).
Any excess activated sludge (AS) is sent to holding tanks called digesters in the form of waste activated sludge (WAS) to continue biological decomposition (stabilization).
From the digesters the stabilized sludge is de-watered by a belt press, then it is mixed with calcium oxide (lime) and the PH is raised to 12.0 for two hours and then held for twenty-two hours at a PH of 11.5.
After the sludge has been stabilized it is then transported to local farmland to be used as a fertilizer supplement.