Saturday, April 21, 2007

India develops first floating desalination plant

apr 22nd, 2007

---------- Forwarded message ----------
From: Shahryar

India develops first floating desalination plant

India has developed a floating desalination plant - the first of its kind in the world - off the Chennai coastline. With a capacity of one million litres per day, it will prepare fresh water from ocean water to address the acute potable water shortage in coastal India.
 
From correspondents in Delhi, India, 18 Apr 2007 - (www.indiaenews.com )
 
India has developed a floating desalination plant - the first of its kind in the world - off the Chennai coastline. With a capacity of one million litres per day, it will prepare fresh water from ocean water to address the acute potable water shortage in coastal India.
 
The plant has been developed by the National Institute of Ocean Technology (NIOT).
 
'It's a first of its kind in the world. Mounted on a barge, the plant would provide much better potable water to any state along the coastline. The floating plant can serve any mainland where deep sea water is available 30 km-40 km off the shore,' said Kapil Sibal, minister for science and technology and earth sciences here Wednesday.
 
'The total cost of the plant was about Rs.220 million. At present it's costing us just six paise to produce one litre of water. The plant would start its regular operations in early 2008,' Sibal told reporters.
 
He said the water quality would be much better than what is available today. The total dissolvable solid proportion in this water is only 10 particles per million (PPM) as against a national standard of 2,000 PPM.
 
The plant will be demonstrated before the media Thursday.
 
Sibal said NIOT embarked on the venture after the encouraging results of the indigenously designed land-based plant at Kavaratti in Lakshadweep that has been generating nearly 100,000 litres of fresh water from ocean water.
 
The plant is mounted on a 65-metre-long by 16-metre-thick barge. The ocean's surface water is boiled inside a vacuum container.
 
The vapour created in the flash boil process is condensed through a refrigeration process with the help of deep-sea water collected from nearly 600 metres below the surface of the sea.
 
'The deep-sea water temperature is almost three times less than that of the surface water in the ocean and it helps in the cooling process of the vapour, thus preparing fresh water,' said S. Kathiroli NIOT director.
 
He explained that the most complex part of the process is the withdrawal of cold water from the ocean, which requires a long pipe of one metre diameter made of HDPE pipes. HDPE pipes are manufactured in lengths of 12 metres. These have to be joined together to make a 600-metre pipe weighing 100 tonnes.
 
'Due to the density of the saline ocean water, the pipe floats and heavy weights have to be attached at the lower end of the pipe to straighten it. The pipe was assembled at the Ennore Port and then towed to the site and connected under the barge,' said Kathiroli while speaking to IANS.
 
Elaborating, he said that to carry the potable water from the barge to the shore, NIOT has developed water bags of special material that can hold 200,000 litres of fresh water.
 
'Since fresh water is lighter than saline water, it floats and very little power is required to tow it to the shore. Small boats would be deployed to carry water from the site,' said Kathiroli.
 
(Staff Writer, © IANS)
 

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7 comments:

Chatrapath said...

This is GOOD for Indians. I'm surprised that this inventor or the person who implemented this idea has not "disappeared".

humdinger said...

Rajeev,

You know what!!.This news is not covered by ELM in India. I read this in the telugu news paper called "Eanadu".
Our ELM is busy with Aish -Abhi wedding ;)

TallIndian said...

Humdinger,


The illustrious Hindu does indeed have an article about that plant.

humdinger said...

@Tallindian,

yes, you are right. But The Hindu published it because the news is from Chennai ;)

TallIndian said...

I still call it Madras. And can you imagine the city if they can get this technology implemented?

No more water shortages. No more arguing with Karnataka over the Cauvery.

Madras would leave Singapore in the dust!

Harish said...

Not that fast TallIndian...!!!

Cauvery water was never meant for madras.. its meant for farming in the Cauvery delta ..

So the desalination plant will just help quench the thirst of the city.. thats all..nutin more nutin less

I wudnt jump the gun on leaving Singapore to dust.. !!! :-)

san said...

Yes, but it's a sign of things to come. They say that water shortages and follow-on conflicts are going to be a big problem for SouthAsia. It's good to know that technology may help to provide a band-aid for some of it. There could be many such barges in the future.