Processes and systems for treating sour water

A system for treating sour water, the system comprising:

• an aqueous solution preparation system comprising an aqueous solution comprising from 15 percent by weight (wt. %) to 30 wt. % of metal chloride and from 1 wt. % to 10 wt. % of metal hydroxide based on the total weight of the aqueous solution, where a metal of the metal chloride and a metal of the metal hydroxide comprise strontium, barium, or both;
• an electrolyzer disposed downstream from the aqueous solution preparation system, the electrolyzer comprising at least one anode, at least one cathode, and a power source electrically coupled to the at least one anode and the at least one cathode, the electrolyzer operable to pass an electric current through the aqueous solution to produce a treatment composition comprising hypochlorite;
• a reactor downstream from the electrolyzer, where the reactor has a sour water inlet operable to introduce the sour water to the reactor, and the reactor is operable to contact at least a portion of the treatment composition comprising the hypochlorite with the sour water at a pH from 8 to 12;
• and
• a separation device downstream from the reactor, where the separation device is operable to separate precipitated solids from a treated aqueous mixture to produce a solid product comprising metal sulfates and metal carbonates and a treated effluent comprising the metal chloride.