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D-58453 Witten - Germany
Phone: +49 - 2302 969 - 0
Fax: +49 - 2302 690443
info@duechting.com
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| Field
of Application: Desalination |
 Two
thirds of the surface of our planet is covered with water, yet providing
the population of the world with high-quality drinking water is becoming
increasingly difficult not only in arid regions, but also in the conurbations
of industrial countries. Even today, existing resources cannot be
fully exploited, for instance as a result of the contamination of
ground water with nitrates and the lowering of the water table. So what would be more obvious than using the large quantities of seawater available for the provision of high-quality drinking water? Along with the thermal process, reverse osmosis - a process that is based on membrane technology - is becoming increasingly popular for the industrial desalination of seawater. However, the complexity of these kinds of desalination systems requires plant components that meet high technical standards. 
High-pressure pumps are feeding the membranes with seawater form the
heart of reverse osmosis plants. With the ROWA-HP
and HK
series, DUCHTING PUMPEN offers multi-stage high-pressure centrifugal
pumps that are particularly suitable for the desalination of seawater.
The choice of the right pump and of the right stainless-steel materials
suitable for seawater has a crucial impact on the plant availability
and, of course, also on its economic viability. Hydraulics that have
been especially designed for this application guarantee optimal efficiencies
at the pumps' operating point. 
It is important to note that the energy requirements of the reverse
osmosis process can be reduced considerably, since the high pressure
energy of the flow that is left at the end of the desalination process
can be used for energy recovery: By means of a Pelton turbine, this
pressure energy is led back into the system by coupling the turbine
shaft directly to the pump shaft. This helps to reduce the power of
the drive that needs to be installed for the high-pressure pump. As
a result, up to 45 % of the drive energy required can be led back
into the system. For other ERT systems, the development is still open.
DUCHTING PUMPEN offers tailor-made plant solutions and complete pump trains that consist of a high-pressure pump, a drive motor and a Pelton turbine. |