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How does filtered water differ from reverse osmosis water?
Q: I work in a bio-ethanol production plant equipped with a multi-pressure distillation system.
In order to decrease the cost of water treatment, we are going to change the process water (which is mainly used in the fermentation section) from a good quality water (reverse osmosis) to the filtered water having the following data:
EC:2920 µs
TDA:1500 µs/cm
TURBIDITY:0.6
Cl2:0.5 ppm
I would appreciate if you could advise me whether the aforementioned water is good for the distillation system and why?
What are disadvantages with the distillation equipment (e.g., heat exchangers) using this water?
A: This is really out of my area of expertise, so take my reply with a ton of dissolved salt. I don’t know how much this filtered water differs from the reverse osmosis water you are now using. I am assuming it has more and different impurities than the RO water.
If this water is re-circulated through the process it may cause deposits in the condensers and re-boilers as the impurities buildup. And the metallurgy should be able to tolerate the Cl2. I think you suspect there could be problems in these areas. I think you should contact a water treatment company and get their advice and help in monitoring the water quality in the distillation unit. As these trace concentrations buildup it may also affect the VLE.
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