The electroplating industry wastewater is more complex, which contains a large amount of heavy metal ions. These substances are difficult to degrade naturally. If they are directly discharged into the river without treatment, the river water will deteriorate. The current required method is to discharge after the treatment meets the standards. Generally, chemical methods are used as the treatment process, in which polyacrylamide flocculant needs to be added. The electroplating industry using polyacrylamide flocculant water treatment is as follows:
Before adding polyacrylamide flocculant, electroplating wastewater treatment needs to adjust the pH of the wastewater. We know that various types of polyacrylamide products have certain requirements for the pH of the water, so in order to treat electroplating wastewater, PH value adjustment tank is generally built, and after adjustment, the wastewater generally needs to be added with two products of polyaluminum chloride and polyacrylamide. The former is used as a coagulant to make some small particles in the water form small clumps that can be basically seen by the naked eye. The other is to act as a flocculant to allow these small clusters to be bridged into larger flocs through the principle of adsorption and bridging.
The amount of product used varies greatly due to the concentration of wastewater. Generally, about 40 to 100 grams of polyaluminum chloride is needed to treat one ton of electroplating wastewater, and the corresponding amount of polyacrylamide flocculant is 2 to 10 grams, maybe even less. These data can only be used as a reference, and the specific dosage can be determined after a beaker test is carried out according to the wastewater to be treated.