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 ?

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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 ?