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HATTERAS REVERSE
OSMOSIS
WATER TREATMENT PROCESS
Wells
The source of our feed water is 19 shallow wells drilled to 70 to 90 feet
deep (freshwater feed to Ion Exchange Blend Process) and four brackish
water wells drilled at 260 to 308 feet (reverse osmosis feed wells).
Treatment
 Reverse Osmosis:
Raw water from four (4) brackish RO wells is pre-treated
and pumped to the dual 16 vessel, seven (7) element RO units at a feed
pressure of approximately 400 psi. Operating at a 68% recovery rate, these
units are capable of producing 1.4 million gallons per day, which is treated
with chlorine, fluoride, corrosion inhibitors and adjusted for proper pH.
This "finished water" is sent to our 3 MG ground storage tank located at
the plant site for pumping to our elevated tank sites in Avon, Buxton,
Frisco, and Hatteras.
Anion Exchange/Filtration:
Raw
water from 19 shallow fresh water wells is pumped through a low pressure
anion resin exchange system to remove any organic "color producing" components.
The water is then oxidized and filtered to remove iron and manganese. The
product from this treatment is then blended with the product water from
the RO process to produce a total of two (2) million gallons per
day of very high quality water.
Process Control System
Operation of the plant, wells and
high service distribution pumps are controlled by a Delta-V computer system
utilizing Rosemount instrumentation.
Waste Discharge
The water from the regeneration of the water softeners is pumped to the
settling basins at the old plant adjacent to the new plant for further
treatment prior to being discharged into Brigand's Bay.
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