After watching this video I have some questions.
He mentions there are two ways to run dual membranes- in parallel or in series, however the "series" he describes is not actually in series- it is the "wastewater staging" setup designed to take the wastewater from one membrane and filter that through the second.
As you can see the series setup does nothing to improve the TDS, which is actually worse than a single membrane.
Why did he not mention a true series setup- where the output of the first membrane is run through a second membrane?
Lets say your first membrane is not giving you sufficient rejection- so you want to filter that water with the second membrane to achieve the desired output TDS.
For example your first membrane is putting out 15 tds at 80% rejection, and this is unacceptable. Thus you use a second membrane to achieve another 80% rejection of the original 15, giving you 3 tds.
Why did he not mention this? or why would this not work?
(I am aware that this method would have a much higher waste/product ratio- that alone would not be a reason why this would not work)
Thank you!
He mentions there are two ways to run dual membranes- in parallel or in series, however the "series" he describes is not actually in series- it is the "wastewater staging" setup designed to take the wastewater from one membrane and filter that through the second.
As you can see the series setup does nothing to improve the TDS, which is actually worse than a single membrane.
Why did he not mention a true series setup- where the output of the first membrane is run through a second membrane?
Lets say your first membrane is not giving you sufficient rejection- so you want to filter that water with the second membrane to achieve the desired output TDS.
For example your first membrane is putting out 15 tds at 80% rejection, and this is unacceptable. Thus you use a second membrane to achieve another 80% rejection of the original 15, giving you 3 tds.
Why did he not mention this? or why would this not work?
(I am aware that this method would have a much higher waste/product ratio- that alone would not be a reason why this would not work)
Thank you!