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(A) Electrochemical treatment results in the removal of not only Ca and P ions but also Mg2+ and inorganic carbon. XRD pattern of the collected precipitates (B) before and (C) after heating treatment at 600 °C for 1 h. Conditions: electrolysis time = 24 h; current density = 8.3 A/m2; anode: Pt–Ti; cathode: Ti (36 cm2); electrode distance = 3 cm.
