Namely wastewater containing mercury sulfide was added, the reaction is as follows:
Since the concentration of HgS is small, precipitation of HgS can be precipitated even under acidic conditions (pH ≥ 1). When an excess of wastewater S 2 - ions, in order to avoid adverse consequences, may be supplemented with ferrous sulfate iron sulfide precipitate. At the same time, Fe(OH) 2 and Fe(OH) 3 combined with Fe 2+ and OH- ions in wastewater can also act to co-sediment and coagulate sedimentation of HgS suspended fine particles. For example, when a plant is treating 5 mg/L of wastewater containing mercury, it is first neutralized with lime (pH=8-10), which is conducive to the precipitation and corrosion prevention of HgS, and then discharged after treatment with Na 2 S and FeSO 4 . Water can be diluted to meet emission standards. The method treats inorganic mercury as a high-efficiency method, and organic mercury is first oxidized to inorganic mercury before it can be treated by precipitation.
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