Hi world, I'm curious about whether having to put nanofiltration on the first phase then reverse osmosis on the second phase to desalt seawater that has a roughly 35000ppm of TDS will lower down the pressure requirement of the RO process or the overall energy requirement of whole process?
Since after NF, the TDS in seawater will be lowered and during RO process less pressure will be require to turn the seawater (after NF stage) into drinkable water. Does this actually work in terms of having a lower energy requirement in the overall process?
I don't think so! Each membrane works with a specific transmembrane pressure and therefore consumes the corresponding energy. The pretreatment by the nanofiltration would reduce the fouling on the reverse osmosis and subsequently would slightly reduce the required energy. But, over all using two membranes should require higher energy in comparison with a single membrane.
1.The pore size of NF is not suit for the Na/Cl remove from seawater, and the NF is also not a good pretreatment, because the pore size is too small. The NF+RO for desalination of seawater is not a good choose, I think.
2. To reduce the energy of desalination, you should consider more, and not focus on the NF and RO membrane only.
NF+RO combination is capable to improve RO sustainability in sea water desalination applications. Due to the options of Hardness and TDS partial removal, organics and some other contaminants rejection at NF step. So RO could operate in a "softer" conditions and RO recovery could be increased. Some savings should be associated with RO permeate flow increase and RO maintenance costs reduction (in case of NF+RO). But power consumption is an issue that needs to be checked case by case. Although Weak Acid Cation in front of RO will bring you energy costs reduction for sure.
Hello Hock Chee Lu;
Good question and excellent answers from my colleages above. I agree with Ali Nematollahzadeh as to the energy demand will be higher for a two-stage filtering process than for a single one; however as Sergey Lvovich Gromov pointed out, in the long term the use of an NF+RO process will improve significantly the performance of the RO process by preventing membrane fouling as quoted above (thus reducing the energy of the RO operation itself), as well as its life-time duration, and maintenance. So in the long term I would think that the combined process will improve the global performance and economical viability of the desalination process.
Regards.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal choose.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal choose.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal choose.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal choose.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal choose.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal choose.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal choose.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal choose.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal choose.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal choose.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal choose.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal choose.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
I agree that NF+RO is reducing operation cost of RO itself but will increase opetation cost of NF , becusd fauling will move from RO membrane to NF membrane , so i think NF+RO is not an ideal process.
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