Looking at the statistics from BCC Research, the dominant process for the seawater desalination worldwide is based on membrane technology and this technology seems to be remained in main stream for many years to come, unless there is a breakthrough on new technology.

Thanks Lau W J for the reply..

You are welcome.

Excellent solution is electrodialysis. You can use reverse osmosis in combination with ion exchange.

Nice reply Radmila. True they are the only way for now.

Can you PLEASE share your experiences and expertise if any.

[email protected]

What do you think about forward osmosis?

Today OI technology is the most competitive. However, there are a number of issues that must be resolved.

1) seawater temperature.

2) caudal necessary water

3) sources of energy available, price...

4) maintenance and accessibility of the staff.

(5) other..

Some of these points can alter its decision.

what else? maybe we should propose membrane distillization. It offers little fouling and could be combined quite well with some wind-aided system or heating process like the thermal-power plant near seaside. But in real, this tech is not that mature as the RO and ED yet

An installation of seawater OI works with high pressure and efficient recovery system is achieved using a pressure exchanger type PX or similar. If the installation conditions are steady regimen (pressure and flow) this type of retriever is the most interesting. However, if the situation is variable might use other devices (e.g. pelton turbines).

It is possible to see in the original article

“Estudio del comportamiento de un sistema de recuperación de energía en una planta de ósmosis inversa en condiciones de funcionamiento de régimen variable, fundamentado en el empleo de un sistema PX”

Dear Ignacio Nuez,

Thanks for your reply.

I personally believe physical methods than pure chemical methods..

What about Low Pressure/ High Pressure Distillation of sea water? Or use techniques like SOLAR DISTILLATION?

I wish to know if nay have already carried out such works...

-- Udaya Bhanu

Dear Udaya Bhanu

A change of phases always implies one much higher energy consumption 3-4 times higher. The use of the technique of distillation may be justified if there are surpluses of energy sources (gas). On the other hand use of renewable systems will depend on the necessary flow and cost expected per cubic meter. Any of the discussed techniques produce water but you should see the cost of production and the feasibility of each method.

Ignacio de la Nuez

The untreated seawater quality is an prime determinant of fouling, retentate production / % water recovery and resulting energy requirement per m3. Retentate from some brine solutions may be as high as 20% - so reducing water recovery to 80%. By use of BAC-UF-CDI i.e. biological activated carbon, ultrafiltration and capacitive deionization on the retentate it should to produce up to 95% water recovery - so increasing efficiency and reducing fouling difficulties.

nice reply...  sir.. seamus.

any supporting documents  if any please?

I am very much intrigued by the reply from Seamus, is it possible to get documents?