Please read my conference Article about it. the link is hereby attached
Conference Paper Experimental investigation of vacuum membrane distillation f...
Dear A. H. M Ibnul Arabi ,
Based on the last investigation, vacuum membrane distillation (VMD) is the best one that I am working on.
Regards
There is no answer to your question in general.
The process choice depends on a lot of factors: water resource availability and raw water quality, desalinated water quality requirements (water for irrigation, drinking water, process water, boiler feed water, ultra pure water and etc.), local climate conditions and environmental regulation, tariffs for power supply and reagents prices, infrastructure available and many others on top.
Therefore you could get the answer to your question case by case if proceed with comprehensive technical-economical evaluation each time.
To continue on the already explanatory answer given by Sergey Lvovich Gromov , productivity also comes into play. Some desalination systems are energy intensive. Those that are not energy intensive could have low throughputs. You could even find one with both energy-efficiency and high throughput but with high technoeconomical impact in the area of cost, etc.
In summary, there is no perfect system.
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