Water Treatment Process
Four (4) Influent Screw Pumps, each capable of pumping up to 10 million gallons of wastewater a day, sit beneath green odor control covers at the beginning of the treatment process.
These pumps, referred to as Archimedean Screw Pumps, are well-suited to applications where high capacity and non-clogging operation is required.
As a "primary" treatment step, water passes through large settling tanks (primary clarifiers) where some of the particulate and floatable pollutants are removed. Suspended and dissolved pollutants still remain.
Scraper devices that travel along the surface and floor of the tanks mechanically collect floatable and settleable material. The collected material is then pumped through a device that removes inorganic material and is subsequently pumped to the anaerobic digesters.
Two large "aeration basins", each with a volume of 1,885,000 gallons, use a variety of hungry microorganisms (bacteria) to remove the suspended and dissolved pollutants remaining from the primary treatment step. This process, one of many, is known as "secondary treatment".
Special "zones" within these tanks encourage the growth of specific types of microorganisms that perform specific jobs such as the removal of ammonia nitrogen.
Treated effluent then flows to the disinfection station for one final treatment step before discharge.
Without the addition of any chemicals, ultraviolet light destroys bacterial DNA, thus, preventing reproduction. The device pictured contains two sets of multiple ultraviolet light bulbs through which the treated effluent must flow. The ultraviolet lights are beneath the water surface and not visible in this photograph.
Pictured, are large, 200 horsepower blowers, which provide air for both mixing and biological oxidation in the aeration basins.
Aerobic microorganisms - requiring oxygen - use organic pollutants present in the wastewater as a food source. The presence of a large population of microorganisms allows the aeration basins to achieve a high degree of treatment in a relatively short period of time.