Some customers will worry that ferrous sulfate products contain heavy metals, which will lead to the heavy metal content not reaching the standard in sewage discharge. Lvyuan Environment Group Co.,Limited tells you that ferrous sulfate products do contain heavy metals, because the raw materials for the production of ferrous sulfate are iron and dilute sulfuric acid, and ferrous sulfate itself is a by-product of titanium dioxide. Manganese is the associated metal of titanium ore, which is the raw material of titanium dioxide plant. In the production process of titanium dioxide, manganese will enter ferrous sulfate. Therefore, some ferrous sulfate contains manganese. However, the presence of manganese in ferrous sulfate will not cause excessive manganese concentration in wastewater.

The content of manganese in ferrous sulfate is 888mg / kg. According to the dosage of ferrous sulfate in wastewater of 1000ppm, the concentration of manganese in wastewater is only 0.000888g/l. Such a low concentration will not affect the biochemical system. On the contrary, the use of ferrous sulfate will bring trace manganese into the biochemical system, which improves the removal efficiency of pollutants (especially ammonia nitrogen) in the biochemical system.

Ferrous sulfate decomposed from wastewater has strong redox ability, which can reduce some heavy metals such as Cu2 + and Cr6 + to insoluble substance Fe (OH) 3. In addition, a part of ferrous ions will oxidize with dissolved oxygen in aqueous solution to form trivalent iron ions. After trivalent iron ions are hydrolyzed to form polynuclear complexes, which react with heavy metal pollutants in water and precipitate by flocculation and hydroxide. In addition, trivalent iron ions will destroy the chromogenic groups in wastewater, which has good decolorization effect.

To sum up, the heavy metals in ferrous sulfate products will not affect the water treatment effect in wastewater treatment, but also play a good role in water treatment.