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Falling Film Evaporator Scaling Issue

zld wtp scale

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#1 Chem2tech


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Posted 29 April 2017 - 03:02 PM

I have a ​scaling problem ​in my Zero ​Liquid ​Discharge (​ZLD) Plant and ​this problem ​happened when ​two feeds met ​at the ​interstage ​tank. ​

We tried ​several ​antiscalants ​and problem ​still remains. ​

How can I ​achieve zero ​scaling?  ​

I can provide ​feed streams ​analysis and ​any required ​information if ​needed.  ​

#2 sgkim


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Posted 10 May 2017 - 11:15 PM



The dissolved solid(DS) in the feed shall surely clog in the evaporator when the diluent liquid is fully evaporated.  So you must continuously remove the DS matter somewhere in your process.   Material flow diagram will help for the understanding of the process.


If possible, thick (concentrated) liquid can be drawn from the evaporator and treated to remove the DS as solids by cooling and filtering. And the thick residual filtrate can be continuously recycled and mixed with the lean fresh feed to the evaporator.       


Detail process description would be required for further help by the professionals here. 



Edited by sgkim, 12 May 2017 - 01:32 AM.

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