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Entrance Desalination technology

Desalination Technology is developing globally very fast these days. More and more desalination technologies getting applied into the conventional water treatment business today. DME does follow and support this development on an international basis starting from the first idea up to commodity products.

In order to give some direction what technology is available today this area will give a basic direction.

Following the navigation of this side you will find fundamentals such as on the right listed.

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Entrance Desalination technology2017-07-28T18:39:11+02:00

Graphene Membrane Withstands Ultrahigh Pressure, Shows Desalination Potential

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Rohit Karnik, an associate professor at the Massachusetts Institute of Technology’s Department of Engineering, said the discovery could open graphene to a number of new applications, including desalination, where filtration membranes that can withstand high-pressure flows  can more efficiently remove salt from seawater.

“This is a fundamental study at this point, and what it shows is the possibility that one can design graphene membranes that can withstand high pressures,” Karnik said during an exclusive interview with R&D Magazine. . “This in itself doesn’t immediately lead to any application but it is basically a demonstration that you can design […]

Graphene Membrane Withstands Ultrahigh Pressure, Shows Desalination Potential2017-07-28T18:38:57+02:00

Desalination technology basics

Giving the foundation to a building will form its size in footprint and height. Knowing the basics in desalination will show the limits and open opportunities. Reviewing the given technology basics structured on a scientific background from three different angles does lead into a more clear orientation. This section opens up three important basics:

  1. driving forces (in preperation),
  2. working principle and
  3. technology classifications.

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Desalination technology basics2017-07-28T18:38:43+02:00

Working principles in desalination

Working principles in desalination are build up in order to provide everybody dealing with desalination issues an orientation. Of cause this structure is set up to be as general as needed and as detailed as possible.

A lot of basic principles used to desalinate water are working together with other principles as well.

This structure does follow the main driving forces and neglect minor forces even if this forced do support the main goal to desalinate.

Everybody is free to make use of this structur of working principles in desalination but is asked to make a reference to DME […]

Working principles in desalination2017-07-28T18:38:29+02:00

Classification of Desalination Technologies

Desalination technology is used by humans since thousands of years. Being in the desert surrounded by sand and rocks or being on the sea sailing through salty waters, always fresh water is needed every day to keep the human body in a balanced hydrate mode.

Nature started using desalination processes from the very first moment. Different concentration levels drive everything alive on our planet. Humans started using first evaporation and condensation processes to purify unusable water. In the last century the number of processes to desalinate water and other liquids has gone through a very big development. New processes have been […]

Classification of Desalination Technologies2017-07-28T18:38:12+02:00

Desalination Technology in use

Today three technologies are dominating the international market. These are Multi-Stage Flash (MSF), Multiple-Effect Distillation (also Multi Effect Distillation or MED) and Reverse Osmosis (RO).

Looking into a global installed capacity in 2016 of about 90 mio m³/d app. 90% of this water is produced by these three technologies.

Multi-Stage Flash (MSF) takes app 20%, Multiple-Effect Distillation (also Multi Effect Distillation or MED) app. 5% and Reverse Osmosis (RO) app 65% of this.

The number of installed plants differs very much because a single MSF plant today easily does  produce 60.000 m³/d versus a RO plant very often produces […]

Desalination Technology in use2017-07-28T18:37:55+02:00

Future Desalination Technology

Saving material and energy per ton of water produced is the main target of all developments in desalination. Due to this basic attempt every of the today known technology has to prove its benefits against the established ones. Not pointing out every new technology three of them are selected and briefly described at this stage (2017).

Obviously an idea for a technology needs to develop. On the right hand side you can see an overview of different technologies. This sketch does illustrate the state of science knowledge and in the same way the state of Development, Technology and Art.

Legend: State of […]

Future Desalination Technology2017-07-28T18:37:30+02:00

Reverse Osmosis (RO)

Reverse Osmosis (RO) is an osmotic process that uses a semi-permeable membrane to separate water from dissolved matter. Applying a pressure greater than the osmotic pressure (determined by the TDS), feed water is forced through RO-membranes which hold back diluted ions and only allow water molecules to pass through. This divides the feed water into a brine stream with a high TDS concentration and permeate stream with pure water (Fichtner, 2011), (Trieb, 2007). Reverse Osmosis plants are used as well for seawater as for brackish water desalination (Fichtner, 2011). As the driving force of […]

Reverse Osmosis (RO)2017-07-28T18:37:11+02:00

Multiple-Effect Distillation (MED)

Multiple-Effect Distillation (also Multi Effect Distillation or MED) is a thermal distillation technology based on evaporation and condensation processes in multiple stages, called effects, that is mainly used for desalination. In most MED plants, the seawater enters all the effects in parallel and is raised to the boiling point after being preheated on tubes. The seawater is either sprayed or otherwise distributed onto the surface of the evaporator tubes in a thin film to further rapid boiling and evaporation. The tubes are heated by steam from a boiler or some other source, which is condensed on the opposite side […]

Multiple-Effect Distillation (MED)2017-07-28T18:36:56+02:00

Multi-Stage Flash (MSF)

Multi-Stage Flash (MSF) evaporation desalination plants are based on flash evaporation in a cascade of stages (effects) at different pressure levels. In the brine-recirculation mode, the brine is recirculated through the system.

In the last stage of an MSF plant, the heated feed water is led into the pressure vessel where it partially evaporates in a flashing process due to the pressure decline. The vapour is used to preheat the feed water. The part of the brine that does not evaporate is sucked into the next stage which has a lower pressure. There, the same flashing and evaporation procedure takes place […]

Multi-Stage Flash (MSF)2017-07-28T18:36:41+02:00
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