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Can PFS and PAC be used together?

Can polyferric sulfate and polyaluminum chloride be used together? This question may be unknown to many small partners. Today, Zhengyuan takes you to know:
 

Both PFS and PAC are inorganic coagulants. PFS is widely used in recent years, while PAC is al coagulant. In the wastewater coagulation effect is relatively good, with the removal of phosphorus, deodorization, COD and heavy metals. Then, if the PFS and PAC are mixed in the process of chemical coagulation of wastewater, what kind of effect will be produced and will the coagulation effect be enhanced?
 

First of all, the basicity of PFS is not consistent with that of PAC. The basicity of PFS is relatively low. If they are mixed, neutralization reaction will occur, which leads to the shift of hydrolysis equilibrium. Finally, most of the hydrolysis makes aluminum and iron form hydroxide colloid, which is jelly like. Some of the non hydrolyzed ones will also depolymerize, and the metal salts will form ionic form, which has lost the original polymerization effect, and can not continue to hydrolyze in the wastewater to produce coagulation effect.
 

Secondly, the mixing of PFS and PAC will lead to the change of their basicity, which makes the storage and transportation more difficult. In addition, the change of basicity will also affect the coagulation effect, and the formation of hydroxide colloid between aluminum and iron will affect its coagulation effect.
 

Reprinted above Baidu Knows

 

 Polyferric sulfate
 

The above is also very reasonable. It is true in most sewage, but in some specific sewage, PFS and PAC can be used together. They have the same effect and similar pH value. In some sewage treatment plants in South China, PFS and PAC have been used together, and good results have been achieved.
 

Whether poly ferric sulfate and polyaluminum chloride can be used together depends on the water quality of the sewage. Before using, it is necessary to do a small test before using it, and then carry out the pilot test, and then carry out the machine test. Do not use it directly, causing waste!

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