Polyaluminum chloride and polyferric sulfate are water purifying agents. What are their advantages in sewage treatment?
Firstly, the polyaluminum chloride treatment process has a great impact on the change of water temperature. At low temperature, the flocculation effect will slow down and the formed alum flowers will also become smaller, resulting in poor sedimentation effect and the suspended solids cannot be removed. However, polymerized ferric sulfate is very effective in the application of low temperature turbidity removal, and there is no residual iron ion. The reaction completely removes suspended solids.
In addition to treating general heavy metal ions, PFS can also remove COD, BOD and water color very well, and the removal rate of BOD can reach more than 93%. The function of removing other impurities and turbidity is also much better than that of polyaluminum chloride.
Then, the phosphorus removal effect of polyferric Sulfate is better than that of polymeric aluminum chloride, and the chloride ion in water will also reduce the flocculation reaction of aluminum salt.
The dosage of polyaluminum chloride and polyferric Sulfate will reduce the alkalinity of water body correspondingly. However, the alkalization base of polyaluminum chloride is higher than that of polyferric Sulfate, so the effect of polyaluminum chloride is worse than that of polyferric Sulfate.
Another point is that the cost of PFS for sewage treatment is low. The treatment standard for the same effect of polyaluminum chloride and PFS is that the dosage of PFS is 50% of that of polyaluminum chloride, so the cost of PFS treatment can be saved by 20-50%. Moreover, the sludge treated with polyferric Sulfate is more compact and less in quantity, and the filterability is better than that treated with polymeric aluminum chloride, which also reduces the cost of sludge treatment.
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