Seawater Desalination- An Ideal Solution in Many Situations
by Reverse Osmosis Reverse Osmosis | Seawater DesalinationSeawater Desalination- An
Ideal Solution in Many Situations
Water is a necessity for all
humans, and yet we are careless about how we use this precious resource. It is
a sad fact that more than 40% of people present on the planet have problems in
accessing potable water and the numbers of such people are growing at a scary
pace. One of the many solutions that can help humans survive and thrive in the
future is seawater desalination. Here we understand all aspects of this useful
water treatment methodology.
Why We Need Seawater
Desalination?
Seawater desalination is among
the most viable solutions for water shortage crisis facing the world. It’s a
known fact that though two-thirds of the earth’s surface is covered in water,
only 2.5% of this water of freshwater. In addition to that, just 0.3 % of this
freshwater can be considered fit for human consumption. The rest of the water
that is present in the seas or the oceans is not fit for human consumption
because it has high salinity levels. Seawater desalination is the answer to
this problem as it can help reduce the salinity of water and make it fit for human
consumption.
Understanding Desalination
Desalination, also known as
desalting of water consists of a water treatment process in which brackish
water or seawater is converted to potable water. For those who are unaware,
brackish water is a mixture of seawater and potable water, so it is less salty
but often not fit for human consumption. After the water is converted via the seawater
desalination process, it can be used for almost all human needs.
Key Seawater Desalination
Processes
There are several processes
involved in seawater desalination. Some or all of them are used in any system
you come across. They are explained briefly over here.
Ø
Reverse Osmosis
Another advanced water treatment
technology, it is a widely popular method to make water contamination-free. It
has been used in more than half of the water treatment facilities across the
globe.
The reverse osmosis process
involves applying pressure to a saltwater solution to ensure that it is forced
through a semi-permeable membrane that allows water to pass through easily but
doesn’t allow dissolved solids to pass. The water passes through the membrane
from a side where the salt concentration is higher to where the salt
concentration is lower. As a result, the concentrated solution part is minimized. This water treatment methodology depends
largely on the external application of energy which leads to the formation of
the pressure that is higher than the natural osmotic pressure of water. Solar
energy can also be used in many cases.
Ø
Distillation
In this process, water is heated
to a point where it evaporates and then is condensed to obtain fresh water.
This process involves many stages, and the temperature and pressure decrease in
each stage until the desired result is achieved. The heat that is obtained from
the condensation can also serve to distil water again.
Ø Freezing
In this process, seawater is
pulverized in a refrigerated chamber at low pressure. It leads to the creation
of ice crystals over the brine. It is separated to obtain freshwater.
Ø
Flash Evaporation
In this process, water is
introduced to a chamber in the form of fine droplets. The chamber is below
saturation pressure. Some of the drops quickly convert into vapor, and it later
condenses to form desalinated water. The water that doesn’t convert is passed
to another chamber that has even lower pressure as compared to the previous
chamber, and this chamber repeats the process until the desired results are
achieved.
Ø
Hydrate Formation
As this process is
technologically difficult, it cannot be used on a large scale. But it is worthy
of a mention. In this process, hydrocarbons are added to the saline solution to
ensure the formation of complex crystalline hydrates that are separated at a
later stage to obtain desalinated water.
Ø Electrodialysis
Another unique process, it
consists of a phenomenon by which an electric current passes through an ion
solution. The cations or the positive ions migrate towards cathode or negative
electrode and anions or negative ions migrate towards anode or positive
electrode. The placement of semi-permeable membranes is done between both
electrodes to ensure that Cl- or Na+ can pass through. In this process, the
water that is contained in the center of the electrolytic cell is desalinated
progressively and freshwater is obtained.
How a Seawater Desalination Plant
Works
The workings of a giant or huge
desalination plant is explained below. It would help you to get some idea of
the processes.
Ø
Pretreatment Processes
This stage comes before the
reverse osmosis process. In this stage, the seawater that will enter a
desalination plant would flow through several screens which remove debris. Then
the water would be subject to two water treatment processes, flocculation and
coagulation. These are traditional water treatment processes that are still
quite relevant. During these processes, first chemicals would be added to
seawater to clump together various elements like algae, particles and other
organic materials. This clumping would be useful during the sand filtration
stage.
After the sand filtration stage,
the salty water would be passed through diatomaceous earth filters that will
remove fine particles and silt. Water will also pass through cartridge filer
before the RO membranes, and it would remove particles that might have been
left even after passing the water through diatomaceous earth filters. It is the
last step of this stage.
Ø
Reverse Osmosis Process
The reverse osmosis process is
the most vital part of the seawater desalination process. In this process, the pressure
is utilized to push water obtained from the pretreatment stage through
semi-permeable membranes. It would ensure that freshwater passes through and
seawater that has double amount of salt and other minerals are left behind. The
size of the RO membrane pore would be very small. It would be around .001
microns. It is about 1/100,000 diameter of human hair.
Ø
Post-Treatment Processes
After the water is passed through
the RO process, a few chemicals will be added to it to stabilize desalinated
water. Then the water is blended with treated drinking water from other sources
to ensure that the final water is up to the mark.
Concentrate Return
The water which was left after
the RO process and was twice as salty as seawater would be blended with cooling
water and discharged so that it blends with seawater as well. The blending
process is essential because it provides more dilution and ensures that long
term build-up of salinity can be prevented.
AMPAC USA - Meeting the WHO
Standards for Drinking Water
If you need to buy a seawater
desalination system or you want to invest in a seawater desalination plant, you
need to ensure that you buy only from a reliable company like AMPAC USA that
has a successful track record of not just meeting but exceeding client expectations.
Every seawater desalination watermaker we provide would have all of the stages
mentioned above. The pretreatment stage would be quite extensive and effective,
the reverse osmosis process will separate seawater and freshwater, and the post-treatment
processes will ensure that the smell, taste and color of the water are
enhanced. The final steps ensure that water is free from microbes and bacteria.
The end result will always meet the standards laid out by the World Health
Organization (WHO) for Drinking Water.
Serving the Needs of the Military
One of the things that set AMPAC
USA apart from other water treatment companies is that we don’t just design
watermakers for residential, commercial or industrial use, we also design and
manufacture heavy-duty military-grade Seawater Desalination Reverse Osmosis
Water Purification Units, abbreviated as ROWPU’s which are fit for the use by
Navy, Air Force, Marine and Army Corps of Engineers units across the globe.
The ROWPU’s we design always pass
the military-grade testing for reliability under harsh conditions and pass all
the tests pertaining to water quality. They are also approved by NATO as a
standard for provisioning freshwater from not just seawater but brackish water
sources as well. AMPAC USA ROWPU’s are also
used for Military Sea Water Desalination, by NATO forces and have been installed
on NATO vessels worldwide. Such ROWPU’s have a unique NATO stock number or NSN
for military-grade applications.
These military-grade ROWPU’s we
design have established a high standard in the Navy Seawater Desalination
industry. They are created by integrating military and marine-grade components
and materials which is clubbed with a craftsman’s extreme attention to
detail. The result is always a
super-duty, very reliable, highly durable military-grade ROWPU watermaker which
is trusted by the military community and Marine Industry across the globe. Many
military units trust our systems for their Military Seawater Desalination and Military
Spec Water Purification System needs.
Meeting the Needs of the
Marine Industry
AMPAC USA is a leading designer,
manufacturer and provider of top-notch marine watermakers that meet the needs
of people who are associated with the marine life. Here are a few reasons why
our customers trust us to meet the water needs of the marine industry.
Ø
Sturdy Exterior and Great Interior
When a person or a group of
people are on the sea or the ocean, they need a watermaker that can last long
due to a tough exterior. We create the exteriors by using high-quality
stainless steel and strong aluminum which ensures that the products would last
long even in extreme circumstances. The sturdy exterior is complemented by a
great interior that has technologies like reverse osmosis and seawater
desalination, which work efficiently to make water drinkable in no time.
Ø
Short Turnaround Times
We understand that the marine
industry is always moving. So, if you need the seawater desalination watermaker
delivered at a specific date like two days before your boat or ship sails, you
can count on us to meet that deadline. We will process the order soon after
receiving it and will ship it via the shortest possible shipping route. Even if
we are designing a customized seawater desalination system for you, our design
team will get started quickly and a project manager would work with design,
manufacturing, quality, packaging, shipping teams and other departments to
ensure that the products are always shipped quickly without any hiccups. As
customized products need to go through many quality tests to prove their worth,
the time needed to ship them would be higher than the time needed to ship
products that are readily available.
Ø
Amazing Customer Service
The customer service team of
AMPAC USA also makes the buying experience smoother. Our engineers would be
eager to talk to you about your seawater desalination needs, visit the
installation site if possible and recommend the best solution. They will always
provide you with multiple options, and you can pick the one that suits your
requirements and budget. As the engineers have a helping attitude, you can ask
all the questions regarding the product, the water treatment processes,
installation, operations and maintenance without hesitation. Even after product
delivery, the customers are free to call us regarding training, installation
assistance or any issues they are facing with the product. We always value our
customers and attend to their needs promptly.
Ø
Experience that Matters
When it comes to seawater
desalination, the expertise of AMPAC USA is hard to match. We have been
delivering quality seawater desalination systems for decades now and we have
deployed watermakers everywhere, be it small vessels that need space-savvy
systems to large ships that have bulk water needs. Some of our products are
even on the rigs in the Arctic ocean, which proves our reliability and
trustworthiness. Another thing that adds a feather to our cap is that we can
design systems that purify water from any seawater source and ensure that it’s
tasteless, odorless and colorless.
It must also be mentioned here
that AMPAC USA Offshore Seawater Desalination Watermakers can be configured to
explosion-proof Class 1 Div. 1 & Class 1 Div. 2 standards, reinforcing
their renowned performance and reliability with maximum protection from
potentially catastrophic events. To know more about any of our seawater
desalination systems, call 909-548-4900 now!
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Created on Oct 30th 2020 05:31. Viewed 333 times.