Aluminum sulfate as a coagulant in wastewater treatment

Nowadays, manycustomers have higher and higher requirements for aluminum sulfate, so our company made a return visit to some customers. We found that although there are instructions, some people still don’t understand well, and they ignore some points that should be paid attention to. Today, the editor will discuss aluminum sulfate as a coagulant with you.

Aluminum sulfate is only suitable for acid sizing, iron-free aluminum sulfate can be used for sizing in acidic and neutral environments, the corrosion of the system is significantly weakened, and the treatment of white water will be easier; polyaluminum chloride can be used in neutral or even alkaline ranges Maintain a relatively high positive charge, instead of forming Al(OH)3 precipitates as quickly as this product, and because of the pre-hydrolysis of polyaluminum chloride, the pH value of the system will not drop very low.

Aluminum sulfate is relatively stable in air. When it is 86.5, it will lose part of the water of crystallization, and when it is 250, it will lose all the water of crystallization. When it is heated, it expands violently and becomes spongy. When fired red, it breaks down into sulfur trioxide and aluminum oxide. It weathers when the relative humidity is about 25% lower. Insoluble basic salts precipitate after prolonged boiling. Moreover, combined with the treatment effect of liquid aluminum sulfate on turbid wastewater, polyaluminum chloride can also achieve the effect of removing turbidity, and even speed up the time to achieve the effect of turbidity removal, but because its relative price is relatively high and the time for turbidity removal is not very long. Compared with ferrous sulfate, the sludge formed by aluminum salt is denser, which can greatly reduce the sludge treatment cost.

The above introduction is related to aluminum sulfate. It can be seen from the above that it is correct to use aluminum sulfate as a coagulant in the treatment of turbid wastewater. If you still don’t understand anything, please contact us directly.