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How does polyaluminum chloride play a significant role?

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Industry News

2021-12-20

Whether polyaluminum chloride can deliver optimal performance depends not only on the quality of the polyaluminum chloride product itself but also on the correct method of use. Today, we’ll introduce some important precautions to take when dissolving polyaluminum chloride before use.

Polyaluminum chloride typically needs to be tested in the laboratory before most applications. The dosage amount is calculated based on experimental data, and then the polychloride solution is prepared for dosing.

When preparing a polyaluminum chloride solution, it is usually necessary to first dissolve the polyaluminum chloride and then adjust the concentration according to actual needs. In general, tap water can be used directly to dissolve polyaluminum chloride; however, water that is obviously contaminated should not be used for this purpose. Under most circumstances, the solution can be kept at room temperature, i.e., 20°C. When dissolving polyaluminum chloride, an appropriate stirring device should be added to accelerate the dissolution rate.

When preparing polyaluminum chloride solutions, it is necessary to base the formulation on data obtained from small-scale trials. Typically, we prepare aqueous solutions with concentrations ranging from 2% to 5%, and then proceed with actual dosing. Usually, we select an appropriate dosing pump to deliver the polyaluminum chloride solution into the wastewater for mixing and reaction.

After adding polyaluminum chloride to the wastewater, it is necessary to monitor the flocculation effect of the reaction at all times. If the flocculation and sedimentation effect is poor, you should increase the dosage pumped in. If alum particles are cut into pieces and floating, you should reduce the dosage of polyaluminum chloride being pumped in.

Polyaluminum chloride is a water-soluble inorganic polymer between AlCl3 and Al(OH)3. Its general chemical formula is [Al2(OH)Cl6], where the degree of polymerization and the neutral charge of PAC products range from 1 to 5. It is a highly charged polymeric ring chain with a Keggin structure, exhibiting strong electrostatic neutralization and bridging effects on colloids and particles in water. It can effectively remove trace amounts of toxic substances and heavy metal ions, and demonstrates stable performance. This test method can be conducted according to the international standard GB 15892-2003.

How should polyaluminum chloride be dissolved and used?

1. Polyaluminum chloride (PAC) is an inorganic polymeric compound that is soluble in water and exhibits a certain degree of corrosivity.

2. Depending on the quality of the raw water, a small-scale test should be conducted before use to determine the appropriate dosage.

3. For ease of calculation, small-scale test solutions are typically prepared at concentrations ranging from 2% to 5% based on the volume ratio (w/V) of the components. For example, if you’re preparing a 3% solution: Weigh out 3 g of PAC, place it into a cleaned 200 ml graduated cylinder, add about 50 ml of clean water, dissolve it completely, then dilute with water to a final volume of 100 ml and shake well. #Function of polyaluminum chloride#;

4. When using, mix liquid products with a 5-10% aqueous solution, and solid products with a 3-5% aqueous solution (calculated based on the product composition).

5. During preparation, mix and dissolve the solid with clear water at a ratio of 1:5 (w/V), then dilute with water to reach the concentration mentioned above.

6. Solutions with concentrations below 1% are prone to hydrolysis, which reduces their effectiveness; if the concentration is too high, waste products tend to form, making it difficult to control the dosage.

7. During operation, pay close attention to monitoring and adjusting the dosage. If there is relatively little alum in the sedimentation tank and the residual turbidity is high, the dosage is too low; if there is a large amount of alum in the sedimentation tank, the sludge is turning over, and the residual turbidity remains high, the dosage is too high and should be adjusted accordingly.

8. The chemical dosing equipment should be corrosion-resistant.

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