Waupun Utilities Water Treatment Facility

Waupun Utilities Water Treatment Facility

Treatment ProcessesTreatment Processes

Source WaterSource Water

Pretreatment SystemPretreatment System

Reverse Osmosis System Reverse Osmosis System

Post Treatment System Post Treatment System

DistributionDistribution

Source WaterSource Water

A 10 in. diameterhole was drilledto 921 ft. in 1896.

A 60 hp submersiblepump set at 187 ft.supplies 650 gpm.

Well 1 Well 2 Well 3 Well 4 Well 5

A 12 in. diameterhole was drilledto 611 ft. in 1916.

A 60 hp submersiblepump set at 140 ft.supplies 680 gpm.

A 12 in. diameterhole was drilledto 794 ft. in 1964.

A 125 hp verticalturbine pump supplies 900 gpm.

A 12 in. diameterhole was drilledto 850 ft. in 1990.

A 150 hp verticalturbine pump supplies 1375 gpm.

A 14 in. diameterHole was drilled to 866 ft. in 1999.

A 150 hp verticalturbine pumpsupplies 1475 gpm.

Pretreatment SystemPretreatment System

• Chlorine is added as an oxidant, this will convert iron and manganese into an insoluble form.

• Horizontal multi-cell greensand filters will capture the iron and manganese. This will allow us to meet iron and manganese requirements and prolong life of the RO membranes.

• A 5 micron cartridge filter is use to capture any sand particles carried over from the filters.

• Scale inhibitor is added to prevent calcium carbonate and soluble salts from scaling within the membrane system.

• The average raw water contains 1.2 mg/L (2.4 maximum) of iron and 0.01 mg/L (0.5 maximum) of manganese.

• The water is dechlorinated with sodium bisulfite.

• 100% of raw water is treated for iron and manganese.

Reverse Osmosis SystemReverse Osmosis System• System pressure is increased to force the water through semi-permeable

membranes to separate impurities. The amount of pressure applied will dictate the degree of purity.

• Water that passes through the membrane is called permeate or finished water.

• Permeate represents about 80% of the water sent to post treatment. The remaining 20% is bypassed around the RO.

• Water that is filtered out is called concentrate or reject, and is sent to the sewer.

1,875

938

Finished Water to Distribution

(gpm)

4003691,4751,8442,2442

2001847389221,1221

Bypass

(gpm)

Concentrate

(gpm)

Permeate

(gpm)

RO Feed

(gpm)

Well Pumpage

(gpm)

No. of RO

Systems

Post Treatment SystemPost Treatment System

• Permeate and Bypass water will be mixed prior to a forced-draft degasifier. As water passes through the degasifier, carbon dioxide is removed by forcing air through the water flow.

• Stripping of carbon dioxide raises pH in the finished water, which helps prevent corrosive water.

• In addition to CO2 stripping, caustic soda (sodium hydroxide) is added to accomplish a pH near 8.0.

• Fluoride and Chlorine is added to the water, meeting all state requirements.

Distribution Distribution

• Vertical turbine pumps called “high lift pumps”, pump finished water to the distribution system.

• Finished water is stored in reservoir and in elevated towers. Storage is need for fire protection and the elevated towers help maintain pressure.

Tower No. 1 Tower No. 2Reservoir

554,000 gal. 250,000 gal. 400,000 gal.

Total Storage

1,204,000 gal.

Flow SchematicFlow Schematic

Well 1

Well 2

Well 3

Well 4

Well 5

Green Sand Filter

Green Sand Filter

Reverse Osmosis

Reverse Osmosis

Degasifier

Chemical Addition Distribution

Bypass