Electroplating wastewater treatment equipment How to treat wastewater
According to the current development of the electronic industry, the amount of sewage generated is increasing, because the electroplating plant sewage contains many heavy metal elements, which will have an impact on the working environment if it is not treated for a long time. Anionic polyacrylamide is a highly efficient water treatment agent, which is usually used by electroplating plants as a settling agent. First, let's talk about the characteristics of wastewater generated by electroplating plants.
The composition of electroplating wastewater is very complex. In addition to cyanide containing (CN -) wastewater and acid-base wastewater, heavy metal wastewater is a potentially harmful type of wastewater in electroplating industry. According to the heavy metal elements contained in heavy metal wastewater, it can generally be divided into chromium (Cr) wastewater, nickel (Ni) wastewater, cadmium (Cd) wastewater, copper (Cu) wastewater, zinc (Zn) wastewater, gold (Au) wastewater, silver (Ag) wastewater, etc. Regardless of the plating type, the plating process is basically the same. According to different plating species, wastewater can be divided into wastewater containing chromium, wastewater containing chromium and other acid-base wastewater. In the electroplating process, after oil removal, acid removal, electroplating and other operations, clean with clean water. Electroplating wastewater comes from the cleaning of plating parts, filtration of plating solution, waste plating solution, and leakage, emission, dripping, etc. caused by improper operation in the electroplating production process.
The treatment of electroplating wastewater has received widespread attention at home and abroad. A variety of treatment technologies have been developed to eliminate and reduce the discharge of heavy metals through measures such as treating toxic wastewater as non-toxic, transforming harmful wastewater into harmless wastewater, recovering precious metals, and recycling water. With the rapid development of electronic industry and the increasing requirements of environmental protection. At present, the waste water treatment of the electronic factory has begun to enter the stage of cleaner production process, total amount regulation and the integration of circular economy. Resource recycling and closed cycle are the mainstream directions of development. In order to achieve a higher recycling rate of electroplating wastewater, the use effect of polyacrylamide is bound to become a key issue.
The characteristics of anionic polyacrylamide used for electroplating wastewater include flocculation. PAM can make suspended components neutralize by electricity, bridge adsorption function, and flocculation function. Adhesion, can play the role of adhesion through mechanical, physical and chemical action. Resistance reduction: PAM can effectively reduce the friction resistance of the fluid. Adding a small amount of PAM to water can reduce the resistance by 50-80%. Thickening property: PAM has thickening function under neutral and acid conditions. When the PH value is above 10, PAM is easy to hydrolyze. In case of semi reticular structure, thickening will be more obvious. Polyacrylamide flocculation precipitation is a component that generates insoluble in the solution of reactants when chemical reaction occurs. Literally, it means precipitation and removal under the function of gravity. Suspended components in sewage, which is a physical process, is easy to operate and has good effect. It is one of the important technologies for sewage treatment.
