Polyaluminum chloride is an inorganic macromolecular water treatment agent with high charge density. It has a high degree of electric neutralization and bridging effect on colloid and suspended particles in water after being added to water, and can strongly remove micro toxic substances and heavy metal ions. The dosage of polyaluminum chloride for any kind of sewage has a certain range. Within the appropriate dosage range, appropriately increasing the dosage of polyaluminum chloride can make the floc sedimentation faster, the floc more compact and the water quality clearer. If the appropriate dosage of polyaluminum chloride is exceeded, what will be the impact of excessive dosage of polyaluminum chloride?
1. Excessive addition of polyaluminum chloride will consume a large amount of alkali in the water, because the pH value of the water is acidic, and additional alkali is required for later treatment of sewage to neutralize.
2. If polyaluminum chloride is added too much, it will break the unstable state formed by colloid and suspended solids in water. Excess charge will make colloid and suspended solids in water form stable state again. The water quality will become turbid, and the formed flocs will also float up to varying degrees. If alum flocs turn up, the density of flocs will also decrease. In general, the added amount of polyaluminum chloride will make the water quality turbid again, and the turbidity of water will change from large to small and then to large, which does not achieve the appropriate effect.
3. With the addition of more polyaluminum chloride, the amount of sludge formation will also increase, and the amount of polyacrylamide used subsequently will also increase accordingly, which not only increases the use cost of subsequent agents, but also increases the amount of subsequent sludge treatment.
With the addition of more polyaluminum chloride, the supernatant will also become turbid, the alum flowers will turn up, the effluent will be turbid, the amount of sludge will increase, and the use cost of follow-up agents will increase, which will not achieve good treatment effect, and the operation cost of sewage treatment will increase. Therefore, the dosage of polyaluminum chloride should be within the appropriate range to avoid the phenomenon of excessive polyaluminum chloride.
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