source:LASEN Environmental Protection release date:2025-12-12 Number of reads:68
Amid the rapid growth of the electronics industry, the treatment of electronic wastewater has become a critical issue in environmental protection. A medium-sized electronics manufacturing company once faced significant challenges in treating its electronic wastewater. The application of heavy metal treatment chemicals successfully resolved this issue, enabling the facility to achieve compliant wastewater discharge standards.
This enterprise mainly produces electronic products such as circuit boards. The production process involves multiple procedures including etching, electroplating, and so on, generating a large amount of wastewater containing heavy metals every day. The concentration of copper ions in the wastewater can reach as high as 80-100 mg/L, while the nickel ion concentration is around 15-20 mg/L. Additionally, the wastewater also contains a certain amount of zinc ions and other impurities. If these heavy metal ions are directly discharged without effective treatment, they will cause severe pollution to surrounding water bodies and soil, thereby impacting the ecological environment and human health.
To address this issue, the company has introduced a heavy metal scavenger as the treatment method for removing heavy metals from the wastewater. This scavenger is a polymeric organic compound containing multiple functional groups capable of chelating with heavy metal ions. During wastewater treatment, the scavenger is dosed into the reaction tank at a concentration of 600–800 ppm, as determined by preliminary bench-scale tests. The scavenger rapidly reacts chemically with heavy metal ions such as copper and nickel in the wastewater, forming stable complexes. These complexes have large molecular sizes and are insoluble, enabling them to precipitate quickly and separate from the wastewater.
Meanwhile, to enhance the treatment effectiveness, the enterprise optimized the treatment process. Prior to adding the heavy metal chelating agent, the wastewater undergoes pretreatment to remove suspended solids and large particulate impurities, preventing them from interfering with subsequent reactions. During the reaction, a stirring device is employed to thoroughly mix the chelating agent with the wastewater, ensuring a uniform reaction. After the reaction is complete, the wastewater enters a sedimentation tank for solid-liquid separation, with
After a period of operational testing and optimization, the quality of the treated wastewater has significantly improved. Monitoring data show that the copper ion concentration in the effluent is consistently maintained at 0.3–0.4 mg/L, while nickel ion concentration remains below 0.08 mg/L. All other parameters also meet the required discharge standards. As a result, the company has successfully avoided environmental penalties and resumed normal production.
This case demonstrates that heavy metal chelating agents possess the characteristics of being effective and highly targeted in the treatment of electronic wastewater. They can efficiently remove heavy metal ions from wastewater, helping enterprises achieve compliant discharge. In today's context of increasingly stringent environmental protection requirements, the rational application of heavy metal treatment agents is a crucial measure for electronic manufacturing enterprises and other units generating heavy metal wastewater to ensure production and fulfill their social responsibilities.
Lanshen Environmental Protection has 15 years of hands-on experience in wastewater treatment and has helped over 500 chemical enterprises resolve various wastewater challenges. Based on your specific situation, we can provide a one-stop solution covering chemical dosing optimization, biochemical system adjustment, process modification, and engineering construction. If you need assistance, please click “Contact Us Now” in the top-right corner—we’re here to serve you!
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