In case, which type is more appropriate?
Do you know if pilot/industrial plants are currently running somewhere? The aim of my question is to understand if an alternative method to RO can be used to remove efficiently Cl-
chlorides are anions , so using of ion exchange resins is good method to remove it
Definitely Yes!
Industrial wastewater treatment resins are classified into four basic categories:
- Strong Acid Cation (SAC)
- Weak Acid Cation (WAC)
- Strong Base Anion (SBA)
- Weak Base Anion (WBA)
As you know Cl- may be a part of them, thus you can use zeolites to reduce chlorides in wastewater.
But, almost all chlorides are soluble. Since this is going to be after secondary treatment and clarification (and possibly sand filtration - lower chance of fouling), I would suggest a desalination technology. Options would be electrodialysis or capacitative deionization. RO is costly and is typically used for a higher salinity range. RO is actually used for low-TDS ppm as well as for seawater. Check if RO is ideal for your requirement, and for only 700Lpd will be cheap to run. Run a small trial.
Good luck.
You can try Electro-chemical method effectively to remove Cl-.@
Francesco Ferella
I am sharing this article on Zeolites that you will find useful. In my experience Cl are better removed with Ion Exchange or RO, depending on initial concentration and end point result, regeneration cost is certainly a factor, and also handling of the concentrated discharge (either regenerant effluent or concentrate from RO, to meet environmental constraints. Year ago only IX was used predominantly, now RO has gaines a lot of room and there are even combinations of RO-IX as polishing systsme to get very low levels of residuals on the treated water. When considering other methods include in your cost analysis energy, which could be interesting.
Ion exchange are synthetic, zeolites are natural but modified can be used also for specific purposes.
ref: http://cdn.intechopen.com/pdfs/41947/InTech-Natural_zeolites_in_water_treatment_how_effective_is_their_use.pdf
Thank you so much Joaquin for your help. I am going to read it carefully
I am sharing with you two good references that are public domain and open for reference , one basic ion Exchange, which I normally share even though basic, very simple, back from the old great days of Rohm and Haas, and the other one is a resin catalogue from one of the leading manufaturers of Ion Exchange in the world now, there are many applications where Chlorides are eliminated daily industrially to give you an idea of the commercial applications and possible sample sourcing for any future related job
Thank you Joaquin, I will check for those that can remove chlorides and I'll try 1-2 resins