Instrumentation for Desalination Plants

The "Phylosophy" of desalinations plants is very deep, but offhand I would say that it is to turn salt or brackish water into potable water, fit for human consumption and agricultural use. Also, "The Phylosophy" has nothing to do with pumping stations or field instruments (whatever that may mean.) Technology takes care of that. Hope this helps.

Not only that, there is a schism into two schools of phylosophy: distillation and reverse osmosis. In bitter acrimony, various partisans have been boiled at the stake.

Here in SA at the coastal town of Sedgfield with a long history of water shortages they are running a reverse osmosis plant supplying about 1150 kl/day at a cost of about 15% of the 1995 estimates.

Search for "desalination process sedgfield" in your engine.

The philosophy depends upon the style of plant being employed and will be written afresh for a particular plant.

• RO:
• simple single stage pumping without energy recovery?
• ditto with energy recovery?
• double stage for high purity technical water without energy recovery?
• ditto with energy recovery?
• Evaporator:
• how many stages?

Etc.

http://www.water-technology.net/projects/larnaca/

This application note may be of assistance, imran.

Good answer. The idea is, my friend imran, that you have to pay in order to get something. Ajwinemaker is there to help and get paid.

Technology has not been discovered and developed over the internet. It is the result of efforts of many smart, intrepid and hard working people. While some nations, or ethnic groups, indulged themselves into tending goats and smuggling opium for centuries, and are still doing that, other ones invested in people, materials and research and moved out of Middle Ages. That's why I think ajwinemaker's answer deserves appreciation. Nothing comes easy anymore. Get to work, my friend, get to work. It might be hard, but you'll get used to it.

Titi-the-rabbit.

http://www.itermaritimum.com/Orvieto/La%20salina%20di%20Margherita%20di%20Savoia.htm

Hi,

here is a link to one of the big still operating natural Salinas in Europe/Italy.

Evaporation is by wind and sun.

First stage is to concentrate the sea-water and to remove gypsum and similar minerals of low solubility.

Second stage is to let crystallise the NaCl = table-salt.

Third stage is either to pump back the brine or to search for tertiary use: will be very important to let react to get high quality phosphor-containing-fertiliser.

This will be one of the top-products for the next decades as the natural phosphate deposits vanish quickly and no new deposits expected to be explored. Mankind needs this fertiliser as agriculture is fully dependent on this stuff.

There is another source from steel-making but this cannot at all cover the demand.

If anybody knows the trace-element composition of first-, second-, and third stage I am highly interested.

These Salinas have an analytical lab but they did not answer my question about trace element composition.

RHABE

Some practical ideas you may get from my site http://www.pimansoft.com devoted to water treatment and desalination plants design automation. The paper "Control resolved" explains basic concepts of the plant control. Attached P&I diagrams contain necessary field instruments.