Conventional Design Previously, the
standard Hydropro design for SWRO with energy recovery incorporated a
single multistage centrifugal pump (or positive displacement) with a
Hydraulic Turbo Booster. This design is fairly simple and generally
does not require a significant increase in system controls or
instrumentation and is for the most part a sound, and energy efficient
SWRO design.
The hydraulic turbo booster converts the
hydraulic energy of the concentrate stream to mechanical energy and
then applies this mechanical energy to the full flow of the feed stream
in the form of a considerable pressure boost. In a single stage SWRO
system, the energy benefit associated with this type of energy recovery
device is realized solely in the form of lower pressure (and thus lower
horsepower) requirements for the high pressure feed pump. Because the
equations used to predict the pressure boost produced by a HTB are
usually specific to the manufacturer and dependent upon the system
parameters, they will not be explicitly discussed here. In this case, a
reasonable assumption would be a 300 psi (693 feet H2O) pressure boost
from the HTB operating in a system as described in Example 1 below. Read More
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