Abstract: A method and system for treating water containing hydrogen sulfide. The system includes the demineralizing the water to remove mineral impurities. The demineralized water is then treated with chlorine to convert the hydrogen sulfide in the demineralized water to hydrochloric acid and sulfuric acid while dropping the water's pH level. The water is then neutralized either by using a marble contact bed and/or by the addition of sodium hydroxide. By demineralizing the water prior to adding chlorine, the pH level of the water is lowered when chlorine is added and elemental sulfur is prevented from forming.

Abstract: Silica can be removed effectively from a mixed bed demineralizer containing an anion exchange resin and a cation exchange resin during regeneration by(1) passing from about 30 to about 80 volume % of an anion regenerant solution through only the anion exchange resin,(2) passing the remaining portion of the anion regenerant solution through both the anion exchange resin and the cation exchange resin, and(3) passing a stream of cation regenerant solution through the cation exchange resin.When the anion and cation exchange resins are regenerated according to this procedure, the amount of silica on the resins is reduced such that when silica containing water is passed through the demineralizer during normal operations, the concentration of silica in the treated water as SiO.sub.2 will be less than 0.1, most preferably less than 0.005, milligrams per liter.