Ferrous sulfate or polymeric ferric sulfate,Which is better?

DATE:2017-10-24 / READ:

Ferrous sulfate or polymeric ferric sulfate,Which is better?

Polyferric sulfate and ferrous sulfate belong to ferric salt, ferrous ion belongs to two valence iron, ferric ferric ion is ferric ion.

Poly iron belongs to the polymerization of polymer ferric salt, the flocculation, flocculant products formed after dissolving in addition to a large number of positively charged ions, but also generate a lot of colloid has effect of ferric hydroxide and other polynuclear polymer, the molecular chain structure of longer, net capacity is better, the flocculation effect is relatively good, the formation of sludge more closely.

Ferrous sulfate in wastewater treatment except as coagulant, the ferrous ions formed with the reduction, can be used for treatment of six chromium wastewater, dye wastewater decolorization and formation process of Fenton has strong oxidation with hydrogen peroxide combined, Fenton treatment of wastewater coagulation process to deal with the effects.

Polyferric sulfate mainly in phosphorus removal, COD removal, decolorization, sulfur removal, removal of SS, the phosphorus removal efficiency can reach about 90%, the removal rate of COD reached more than 70%, in the sewage treatment can be used instead of a number of other water treatment coagulants, such as ferrous sulfate, aluminum sulfate, polyaluminium chloride.

Polyferric sulfate is produced by ferric ion and ferrous sulfate is generated two valent iron ions, these two ions have great difference in sewage treatment, a reduction of ferrous ion in wastewater treatment, reducing decolorization reduction six chromium, reduction of ferric ion, and this is not function. Therefore, if it is used as a reducing agent or Fenton reagent, the effect of ferrous sulfate is better than that of polymeric ferric sulfate.

But if it is used as coagulant or phosphorus removal agent, COD treatment agent and non reduction decolorization treatment, SS treatment, more use of PFS instead of ferrous sulfate. Based on the actual demand, according to the relevant information and experiments to judge and choose.

AUTHOR:ATZ Environmental Protection Technology

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