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Reasons why polyferric sulfate can be used as Dephosphorizer

Compared with other coagulants, polyferric sulfate takes hydroxide as bridge to form multi-core coordination ion. The formed hydroxy complex has more charge and larger specific surface area, and its flocculant is stronger. A large amount of iron ions dissolved in water can neutralize negative colloidal particles in water and react with phosphate to form iron phosphate precipitate.

The formation of iron ion hydrolyzed polymer in polyferric sulfate can be roughly divided into four stages:

(1) Hydrolysis of iron ions to form monomers, dimers and trimers. Dimers or trimers can be bridged by hydroxyl groups.

(2) Rapid formation and dissolution of oligomers and small polymers. The formation of polymers may have a continuous process in which oligomers join to form a three-dimensional structure with the rapid dissolution of oligomers and small polymers, i.e. the Ostwald effect.

(3) Formation of macropolymers is slow. Due to the instability of oligomers, during this period, the polymerization reaction can be roughly summarized into three mechanisms: the formation of hydroxyl bridges, oxygen bridges and crystallization.

(4) Formation of sedimentation. The polymer is formed by hydroxyl bridge bonding and then solidified to form an oxygen bridge, which is accompanied by dephosphorization and precipitation.

During these four stages, while iron ions react with phosphate to form precipitation, the hydrolysis polymer of iron ions can also remove phosphorus by compressing the double layer, adsorption neutralization, bridge trapping, etc. In addition, large polymers may chemically adsorb and react with phosphate to form complexes, which together precipitate.

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