Difference between polyferric sulfate and ferrous sulfate

Polyferric sulfate and ferrous sulfate have similar names. They are not the same kind of products. Ferrous sulfate hydrolysis occurs with divalent iron ions, and polymeric ferric sulfate hydrolysis occurs with divalent iron ions. Ferrous sulfate has oxidation recovery properties, while polymeric ferric sulfate does not. Both belong to iron coagulants, which can resist pollutants in wastewater and remove them after coagulation and sedimentation. Ferrous sulfate and polymeric ferric sulfate have the same principle of removing SS from wastewater, and ferrous sulfate can resist decolorization better.

Polyferric sulfate: polyferric sulfate is a light yellow amorphous powdery solid, which is very soluble in water. The aqueous solution is a red brown transparent solution with hygroscopicity. Polyferric sulfate is usually used in the pollution disposal of drinking water, industrial water, various industrial wastewater, urban sewage, sludge dewatering, etc. it especially resists high-temperature and low turbidity water with obvious results. Coagulation decolorization of polymeric ferric sulfate: it can abnormally resist the decolorization of sulfide and disperse dye wastewater. Polymeric ferric sulfate has good treatment results. Its decolorization principle is not consistent with ferrous sulfate. The most important thing is that polymeric ferric sulfate is not a restoring agent or oxidant, and what is suspended is not the restoration of oxidative decolorization treatment. Instead, materials with selective adsorption and infection such as iron hydroxide and polynuclear complex naturally generated in water are used to stop adsorption and precipitation treatment of acidic groups in dye wastewater. The decolorization result can reach 94 ~ 98%. Generally, in the presence of wastewater chroma, it is often accompanied by the presence of COD.

The use principle of ferrous sulfate and polyferric sulfate in wastewater decolorization can be created. Ferrous sulfate decolorization is to divide large colored molecules into small molecules, and the treatment result of COD is not good. The removal rate of COD by polyferric sulfate in addition to chromaticity can reach more than 80%. Polyferric sulfate is a polymer coagulant using ferrous sulfate as material, so the removal result of other heavy metals and pollutants in wastewater should be better. Ferrous sulfate: it is a by-product produced during the production of titanium dioxide by sulfuric acid method. The appearance of the product is light green or light yellow green crystalline solid. Participating in the recommended dosage can adjust the pH value of alkaline water, combine inorganic with suspended solids in water, and accelerate sedimentation. It is important for water pollution and industrial wastewater treatment, and has bactericidal infection together.

Ferrous sulfate coagulation decolorization: ferrous sulfate, as a recovery agent, is often used for recovery decolorization treatment in printing and dyeing wastewater and wastewater. This is because ferrous sulfate will naturally generate iron hydroxide under slightly alkaline conditions, and such materials have strong selectivity to oxidizing wastewater to recover infection. The restorative bond breaking process is used to stop the division of reactive dye molecules into colorless small molecules. Therefore, ferrous sulfate is often added as decolorizing recovery agent for reactive dye wastewater and sulfide dye wastewater, Almost colorless solution can be obtained. Polymeric ferric sulfate is a new type of polymer coagulant, and its important material is ferrous sulfate. Therefore, the water treatment result of polymeric ferric sulfate is generally better than ferrous sulfate. However, ferrous sulfate is cheap, so it is still widely used in sewage treatment.

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