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发帖数: 17532 | 1
I didn't google for this. I studied water treatment in
university.
The spent exchange medium can be regenerated with a solution
with very high and pure sodium concentration. Let's use
calcium as example. If the calcium in water is extremely low
and the sodium is extrememly high (say, 10%), calcium will
diffuse to water and sodium will replace calcium untill it
reaches chemical equilibrium. If you do it with running
solution, all calcium will be replaced ultimately (not
practical in real life). |
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