The obvious solution is to ...

Published by Mark Spencer

The obvious solution is to oxidize it to sulfate and precipitate out as a CaSO4.

1 Comment

In the question it was told that they don´t want to add expensive oxidants. Furthermore Sulphates cannot be precipitated as CaSO4 below a limit of appr. 1400 mg/l of ulphates. This mentioned amount would remain in the water. So this is not a good solution.

Published by

Permalink

1 Comment

Dear Guido, what exactly do you mean by expensive oxidants ? Is O3 an expensive oxidant ? Have you ever calculated the cost of 1 kg/hr compared to others? Are non-oxidants less expensive than oxidants ? If yes please come-up with some real data.

Also you are talking about the solubility of CaSO4 in water. Actually the solubility at 20oC is 2.1g/l anhydrous and 2.4g/l di-hydrate. But when someones designs a precipetation system he/she uses the so-called COMMON-ION EFFECT. This effect will dramatically decrease the solubility of CaSO4 in water. Have you ever designed a precipetation system yourself ?

Published by

Permalink