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Reasons for discoloration of wastewater after adding polymeric iron sulfate

The reason for the discoloration of wastewater after the addition of polymeric ferric sulfate is related to the chemical reaction of ferric sulfate in water. Iron sulfate is a salt containing iron, and its hydrates and hydrolysis products may cause changes in the color of the solution. Here are some possible reasons:

Hydration reaction: When polymerized iron sulfate reacts with water, it may form a complex containing hydrates. The colors of these hydrates may vary depending on the number of water molecules in the hydrates. Different hydrates can lead to wastewater presenting different colors.

Hydrolysis reaction: Polyferric sulfate may also undergo hydrolysis reaction, generating iron hydroxide ions. This reaction is usually accompanied by a change in color. The generated hydroxide ions may cause the formation of suspended precipitates in the solution, and may also affect the color of the wastewater.

Redox reaction: Iron is one of the elements that is prone to redox reactions. In water, polymerized iron sulfate may undergo oxidation-reduction reactions, forming iron ions in different oxidation states, which may also lead to changes in the color of wastewater.

Other impurities and reactants: There may be other impurities or reactants in the wastewater that react chemically with polymeric iron sulfate, causing color changes. This may include organic matter, metal ions, etc. in wastewater.

It should be noted that the specific color change depends on the reaction conditions, composition of wastewater, and other environmental factors. The discoloration of wastewater may be a comprehensive effect of multiple reactions, rather than just a single reaction of polymeric ferric sulfate.

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