Selective removal of Calcium from wastewater
Q. From our waste water we want to concentrate our zinc level by means of electrodialysis or reverse osmosis. We want to achieve a zinc concentration 80 times as high as the starting level. The problem is that there is too much Ca in our wastewater (240 mg/L) and it will precipitate as CaSO4. Does anyone know of a possibility to remove the calcium and not the zinc?Koen Joris
A. I'll offer 2 suggestions:
1) If the source of the Ca is hard water used for rinsing, switch to using de-ionized water for your zinc drag-out rinse, or
2) Use a heavy metal selective (chelating) ion exchange resin to extract the Zn but not the Ca.
- Goleta, California
Finishing.com honored Ken for his countless carefully
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Rest in peace, Ken. Thank you for your hard work
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December 16, 2016
Q. CaSO4 precipitated in outlet of pipe and we could not pass rinse water to our ETP plant because pipeline choked. Give me advice for that?yogini kalambhe
- Nagpur,Maharashtra, India
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