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Efficiency and
Economy From All Sources
Fertilizer runoff, septic tanks, and land disposal of wastes all
threaten ground water and surface water with nitrates. H&T achieves very
high levels of nitrate removal through a highly effective method
involving the exchange of nitrates, alkalinity, and sulfates for
chlorides using a strong base anion resin.
Countercurrent
Regeneration
Maximum efficiency plus reduces waste and cost
Only Hungerford & Terry offers the efficiency and economy of
a countercurrent regeneration system of nitrate removal. The very
high efficiency of our countercurrent system and its low leakage levels,
allow a maximum amount of untreated water to bypass the system to be
blended with treated water. Any level of nitrate concentration below
federal standards is thus readily achievable in a plant that is
extremely efficient.
This innovative nitrate removal system designed to your specifications will greatly reduce the size of the
treatment plant. It will use as little as half of the regenerant per
cubic foot of ion exchange resin as compared with a conventional system.
It provides maximum efficiency while reducing waste and operating costs.
Regeneration
Cycle
Removes residual levels of nitrates, sulfate, and brine
Regeneration begins with a backflow of raw water through the regenerant
collector to remove suspended material and to decompact the resin. A
brine solution is then injected to remove nitrates and sulfates. A slow
rinse then flushes out most of the brine and removes still more nitrate
and sulfate. Finally, a fast downflow rinse removes residual levels of
nitrate, sulfate, and brine. By fully regenerating the bottom of the ion
exchange bed, leakage is reduced to a fraction of a part per million
allowing greater input water bypass of the system.
Cocurrent
Regeneration
Appropriate for smaller applications and
economy
Cocurrent systems may be appropriate for smaller systems or when initial
capital costs are a very important consideration. The basic chemistry is
the same as that of a countercurrent system. In the more conventional
cocurrent approach, however, regenerant brine enters from the top rather
than the bottom. Thus, a cocurrent system is normally backwashed after
every service run yielding a regeneration sequence that includes an upflow backwash. After the backwash,
downflow brine injection is
followed by a downflow slow rinse and fast rinse.
Both systems use automated
valves controlled by H&T-designed control systems. Actuation can
be pneumatic, hydraulic, or electrical depending on the customer's
preference. Tank linings, painting, man-hole sizes, and other features
can be specified by the customer. H&T's application-specific
configurations include choices of valve operation techniques, exchanger
tank options, internal distribution options, and varying degrees of
automatic control. |
