The electroplating industry is one of the important pillars of the global manufacturing industry, however, electroplating wastewater contains a large number of heavy metals, such as chromium, nickel, copper, zinc, etc., which are extremely harmful to the environment and human health. Therefore, it is crucial to effectively treat the heavy metals in electroplating wastewater.
This article will introduce several common heavy metal treatment technologies in electroplating wastewater:
Chemical precipitation.
Chemical precipitation is a method of converting heavy metal ions into insoluble precipitates by adding chemical reagents to wastewater, and then removing heavy metals from wastewater by solid-liquid separation. This method is simple to operate and has good treatment effect, but it requires a large number of chemical reagents, and the resulting precipitate still needs to be further treated.
Adsorption method. Adsorption method is a method that uses adsorbents to adsorb heavy metal ions in wastewater, so as to achieve the purpose of purifying wastewater. Common adsorbents are activated carbon, zeolite, silica gel, etc. The adsorption method has the advantages of simple operation, good treatment effect and low cost, but the regeneration and disposal of adsorbents is also a major problem.
Ion exchange method.
Ion exchange method is a method that uses the ion exchange properties of ion exchangers to replace heavy metal ions in wastewater, so as to achieve the purpose of purifying wastewater. The ion exchange method has the advantages of good treatment effect and heavy metals, but the regeneration and disposal of ion exchangers is also a major problem.
Biological treatment.
Biological treatment method is a method that uses the adsorption and metabolic functions of microorganisms to convert heavy metal ions in wastewater into harmless substances or enrich them in microorganisms, so as to achieve the purpose of purifying wastewater. The biological treatment method has the advantages of good treatment effect, low cost and no secondary pollution, but the resistance of microorganisms to heavy metals and the enrichment ability of microorganisms need to be further studied.