Hello SF,

I have been reading about RO systems (both Industrial and residential).

 

Please consider, that I have a solution containing only water and NaCl (means no other chemicals, pathogens, bacteria, etc.). Passing the solution through RO membranes, I am able to remove 90% of water. Now, my doubt is about the possibility of extracting the brine that did not pass through the membranes. I know the brine can be flushed out as waste. However, I would like to know what percentage of the brine will be flushed out? Suitable replies would be real help to me.

 

Regards.

Edited October 20, 201213 yr by bhaazee

This Fig. is a solution. The concentration is a process problem. Mwater is controlled by membrane property.

Thanks for the reply. Straight enough.

 

I would also like to know on how to calculate the mesh size. Although, determined based on the size of the particles to be removed, still confused due to technical terms like solvation shell. Being a mechanical engineer, not able to follow properly in terms of chemistry. Would be great if this can be explained (if possible ) or some suitable links could be provided.

 

One more doubt is that, is there by any chance where RO is used to separate water from the brine that contains dissolved solids in the range of Parts per Thousand (say 200 to 500 PPT)? If not possible by RO, apart from evaporation and condensation by what way the water is separated in such cases?

 

Regards.

Would be really helpful if I am able get some answer for atleast one question posted.

 

Regards