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CESR Process for Sulfate Removal
Cost-Effective Sulfate Removal (CESR) is a chemical treatment process that can reduce sulfate concentrations to very low levels.  Originally developed in Europe, the CESR process is used in full-scale installations there but has only been evaluated at the bench-scale and pilot-scale levels in the U.S.  The process combines addition of lime and a chemical called Lumnite MG-4 to precipitate a calcium aluminum sulfate hydrated compound called ettringite.
CESR process for sulfate removal
Here's a paper on the process: