Water Treatment Plant #3

After completing a hydraulic distribution system computer model study in 2005, it revealed that the best location to build a water treatment facility was somewhere in the north end of the city.

WTP3_Site.jpgA pilot study was conducted after the study in December of 2005. Water Treatment Plant #3 was designed, permitted, and ultimately constructed from 2006 to 2008, and placed in operation in July of 2008.  Water Treatment Plant #3 utilizes low pressure reverse osmosis membranes to treat the raw water. WTP No. 3 has a permitted capacity of 3.0 MGD and utilizes twenty (20) source water wells, five (5) treatment processes, two (2) transfer pumps, one (1) ground storage facility and four (4) high service pumps.

The five (5) treatment processes at WTP No. 3 include pre-treatment, low pressure reverse osmosis, degasification, disinfection, and corrosion control. There are two (2) membrane treatment trains, each with a permeate production capacity of 1.125 MGD for a total of 2.25 MGD. Membrane treatment is accomplished in two stages.

After the membrane treatment process, the permeate is treated by degasification to remove hydrogen sulfide and carbon dioxide. Following degasification, the partially finished water is disinfected using sodium hypochlorite and ammonium sulfate. 

The final treatment process involves chemical addition to inhibit corrosion in the distribution system. Sodium Hydroxide is used for pH stabilization and poly-orthophosphate is added for corrosion control. 


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