At first glance, I would ...

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At first glance, I would think that NF as first pass followed by 2 pass RO would be "greener" than 3 pass RO for the simple reason that NF stage would require less pressure for the process.

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Treating liquid=medium age leachate. Permeat low limits drive us to at least 2 passes RO. TNinput=0-80mg/L (almost complete nitrif & denitrif depending on temprature ), TP=1-2mg/L, COD=5,5g/L & EC=21-23mS/cm. 3rd pass is usefull after a heavy rain when RO is loaded with raw leachate or mixed biological treated and raw leachate. So i m trying to transfer more load to 2nd&3rd pass (steady state) replacing 1st RO pass, by NF, reducing at the same time energy consumption.

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