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GAS HYDRATE BASED WATER DESALINATION TECHNOLOGY

A new gas hydrate based water desalination technology has been developed which is capable to viably desalinate high salinity water like reject brine of sea water reverse osmosis (SWRO) plants and highly saline produced water with a level of salinity up to eutectic saline composition. It is capable of concentrating salt water to its maximum possible eutectic composition of 230000 mg/l. Further it works as a eutectic salt crystallizer resulting in crystallization of salt if operated on eutectic saline. The technology does not requires the rigorous distillation or freezing conditions for attaining its goals thus resulting in very low infrastructure cost and very low operating cost. The technology has applications in TDS reduction of wastewater including desalination of highly concentrated produced water coming out of fracking oil and gas wells. In addition, the technology has applications in lot of other areas like separation of costly minerals and chemicals from water, waste water treatment, decreasing sea water salinity etc.

Gas hydrate based water desalination technology is capable to viably desalinate high salinity water like reject brine of sea water reverse osmosis (SWRO) plants and highly saline fracking water/ produced water with a level of salinity up to eutectic saline composition at an electric energy consumption of just around 0.05 kwh/ litre of desalinated water. As electrical form of energy is required by the system so the system can very easily be integrated with non-conventional forms of energy like tidal energy, wind energy and solar energy.

Reverse osmosis based system cannot desalinate high salinity brine. These systems can desalinate water with maximum salinity near sea water salinity.

Efficient forms of distillation based desalination systems like Multi-effect distillation systems (MED), Multi stage flash distillation systems (MSF) and Mechanical and thermal vapour compression desalination systems (MVC and TVC) can also viably desalinate water with maximum salinity near sea water salinity.

Freezing based desalination systems are only available on pilot scale whereas inefficient forms of distillation like thermal evaporation have very high energy consumption.

Fracking water desalination can solve a big pollution problem in lot of developed countries where pollution control laws prohibit discharge of highly saline water into surface bodies. Fracking wells are much costly to drill compared to conventional wells and existing costly water treatment technologies make them even less economically viable. The most economical method for disposing this highly saline water is to discharge it  into deep wells located far-off from the oil and gas well sites. However this discharge of highly saline water into deep wells is highly controversial as it is known to cause earthquakes and pollute ground water. Because of this, pollution control lobbies are asking for a complete ban on fracking. Gas hydrate based water desalination technology can desalinate water to the salinity at which it can be reused for fracking at a cost less than 50 % of the average cost required to truck it to deep wells for discharge.

Licensees are invited to license the technology at mutually agreed terms.

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