Use method and precautions of polyacrylamide flocculant for electroplating plant

The source of electroplating wastewater is cleaning water for plating parts, waste electroplating solution, equipment cooling water and other wastewater. The characteristics of sewage. This kind of wastewater is generally of strong acid water quality, complex water quality, and difficult to control its composition. It contains heavy metal ions such as chromium, cadmium, nickel, copper, zinc, gold, silver, and cyanide, etc. Some of them are carcinogenic, teratogenic, and Mutations of highly toxic substances.

After these heavy metals enter the water body, they have an amplifying effect on the food chain, and can accumulate in certain organs of the human body to cause chronic poisoning and endanger human health. When treating electroplating wastewater, because the wastewater contains many expensive heavy metals, if the heavy metals in the wastewater are recycled as a resource, it will not only solve the pollution of heavy metals, but also have certain economic benefits

Currently commonly used heavy metal wastewater treatment methods mainly include chemical precipitation, reduction, adsorption, membrane separation, coagulation, ion exchange, electrochemical methods, etc. It is found that the result of polyacrylamide selection for treating this type of wastewater is directly related to the pH value of the wastewater, because most of this type of wastewater is carried out under strong acid conditions.

The best method of using polyacrylamide for electroplating wastewater and precautions

1. Polyacrylamide passes a small test to determine the best model and the best dosage of the product.

2. The product is formulated into an aqueous solution with a concentration of 0.1% (referring to the solid content), preferably neutral water without salt.

3. When dissolving the water, evenly sprinkle this product into the stirred water, and increase the temperature properly (<60℃) to accelerate the solution.

4. Solid products are packed in polypropylene woven bags lined with plastic bags, 25kg each.

5. Avoid sprinkling solid products on the ground to prevent the product from absorbing moisture and making the ground slippery.

6. When preparing PAM aqueous solution, it should be carried out in enamel, galvanized, aluminum or plastic barrels, and cannot be prepared and stored in iron containers

7. When dissolving, it should be noted that the product should be evenly and slowly added to the dissolver with stirring and heating measures, and solidification should be avoided. The solution should be prepared at a suitable temperature, and long-term excessive mechanical shearing should be avoided. Cut. It is recommended that the agitator be 60-200 revolutions/min, otherwise it will cause polymer degradation and affect the use effect.