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The document discusses key issues in sea water desalination. It explains that pretreatment is important for protecting membrane life and plant performance. Different membrane types are available for various applications. The number of reverse osmosis passes depends on product water standards and seawater properties. Energy recovery devices are crucial for reducing electrical costs. Post-treatment conditions the water for its intended use, and brine disposal requires careful consideration of environmental impacts.

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Thiha Myat Lwin
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52 views1 page

Contact Us: +31 152 610 900

The document discusses key issues in sea water desalination. It explains that pretreatment is important for protecting membrane life and plant performance. Different membrane types are available for various applications. The number of reverse osmosis passes depends on product water standards and seawater properties. Energy recovery devices are crucial for reducing electrical costs. Post-treatment conditions the water for its intended use, and brine disposal requires careful consideration of environmental impacts.

Uploaded by

Thiha Myat Lwin
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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SeaWater Desalination - Key Issues

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http://www.lenntech.com/processes/desalination/general/desalination-k...

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Home / Processes / Sea water desalination

The desalination core process is based on Reverse Osmosis Membrane technology, but stand alone, it
doesn't provide safe drinking water, nor does it guarantee an efficient plant.

The pretreatment includes all the necessary treatment step ahead of the reverse osmosis plant. It is
determining for plant life time and to minimise chemical cleaning and membrane replacement. It has a
direct impact on the plant performance.
There are as many membrane types as applications. They range from "high rejection" to "ultra low energy"
or " high boron rejection".
The reverse osmosis process can also be built with one or two passes, depending on the product water
requirements and the seawater salinity and temperature. In most cases, 1 pass is sufficient to reach the
EU drinking water standards, specially regarding the boron content (1 mg/L). To reach WHO boron
guideline (0.5mg/L), a second pass might be necessary (Boron removal process)
The energy recovery device is the key factor that determines the plant electrical costs. It must be chosen
carefully based on the local energy costs and environment policies.

Post-treatment and

/or polishing steps are

required to condition the water after the reverse osmosis membrane process to make it suitable to your
application.
Brine disposal can be an environmental and economical issue in some areas where the fauna and flora
are sensitive to local seawater salinity increase. Brine disposal should be studied and engineered case by

12/15/2016 10:37 AM

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