Seawater and brackish water desalination with low-energy reverse osmosis
95% of the water on Earth is salty, in the face of fresh water shortages, many regions have no choice but to use this resource, which is most often abundant, whether it comes from seawater or brackish water (marshes, ponds, underground aquifers affected by the saltwater wedge).
Desalination aims to remove the salt from salt or brackish water in order to make it potable and to allow its use for drinking, industrial or agricultural uses.
95% of the water on Earth is salty, in the face of fresh water shortages, many regions have no choice but to use this resource, which is most often abundant, whether it comes from seawater or brackish water (marshes, ponds, underground aquifers affected by the saltwater wedge).
Desalination aims to remove the salt from salt or brackish water in order to make it potable and to allow its use for drinking, industrial or agricultural uses.
20 years of experience in ultrapure water process, gives us a unique know-how that allows us to realize customized installations up to 5000m3 /Day.
What is Reverse Osmosis –Definition:
Reverse osmosis is a process of separation in liquid phase by permeation through semi-selective membranes under the effect of a pressure gradient, higher than the osmotic pressure of the water. Under the effect of pressure, water will pass through the barrier of the membrane, while dissolved solids (salts, etc.) will remain confined on the other side.
Applied to seawater or brackish water, the reverse osmosis retains ions and reduce the salinity of water by 99%.
Engineering and know-how
Each customer project is unique,our engineering department design each project according to the following parameters :
- water salinity and quality,
- desired conversion rate,
- quality specifications of the water produced.
The quality of the reverse osmosis membranes and the pretreatment are the key points that will enable us to guarantee a reliable and lasting operation over time.
On sea water we systematically integrate an isobaric exchanger which allows to recover the energy contained in the water pressure.
Reverse osmosis for the desalination of seawater and brackish water
CHEMDOC Water Technologies designs and build desalination units for:
- drinking water, industrial process, irrigation,
- from 10 up to 5000m³/J,
- salinity 35 à 45g/l,
- conversion rate of 70%,
- energy efficiency < 3kwh/m³.
Strength and strong points of our equipment :
- compact units (transport and simple installation),
- very competitive manufacturing times,
- low power consumption,
- high conversion rate,
- remote and control monitoring,
- training of operators by video Learning.
Reverse Osmosis uses and applications:
- small cities, communities, resorts, isolated sites, catering and Hotels services.
Specific know-how on brackish waters
Desalinating brackish water, is often more complex than desalinating seawater, this requires specific expertise, related to variation in salinity and turbidity of water.
Our know-how allows us to respond favorably to variations in salinity between 5g /Liter and 15g / Liter salinity, without any interruption of operation.
Our brackishwater desalination solutions are a particularly effective and economical response to the treatment of water from freshwater wells affected by the saltwater wedge phenomenon.
Brackish water and saltwater wedge
This phenomenon is characterized by a mass of salt water coming from the sea, penetrating as a corner below the fresh water in a tidal waterway, the salt water being denser than fresh water.
We speak of a salted corner, or a saltwater wedge.
Saltwater wedge is a major problem for freshwater wells and borehole along the coasts, everywhere in the World.
The rise of salt water leads to the salinization of water, making it unfit for consumption and forces the abandonment of the well which become useless.
This practically irreversible phenomenon is the result of several internal and external causes:
Improper drilling (excessive depth or crossing of the transition zone), overexploitation of the water resource, absence of a catchment protection zone, drawdown caused by excessive pumping.
With CHEMDOC reverse osmosis, especiallyequiped with our innovative technology to withstand significant variations in salinity, the freshwater wells affected by the saltwater wedge became a new water resource!
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