Project Introduction Valuable metal wastewater comes from a wide range of sources, and these metals often have strong toxic effects, leading to severe environmental pollution issues. Traditional treatment technologies for heavy metal-containing wastewater mainly use chemical neutralization precipitation or chemical reduction methods to precipitate the heavy metals and recover them or discard them as industrial waste residue. Currently, this type of wastewater treatment is energy-intensive, costly, and yields low returns. In response to these problems, this proposal suggests using an innovative electrochemical cell to treat such wastewater, reducing valuable metals into elemental metals or low-toxicity substances in lower valence states. At the same time, the system can also efficiently generate electricity to compensate for the electrical consumption during the process. Technical Advantages The proposed invention allows for the treatment of heavy metal wastewater within the same electrochemical cell without generating additional sludge. The equipment is simple, operation is convenient, and fixed investment is low. Metal recovery is easy and environmentally friendly. Additionally, the system can generate electricity, making the equipment simple, with low investment, and safe to operate. Compared to traditional heavy metal wastewater treatment technologies, it has significant technical and cost advantages, and it is relatively easy to achieve higher economic benefits. There have been recent reports on using microbial fuel cells to treat such wastewater and generate electricity, but in these technologies, the activity of the anode microorganisms is greatly affected by environmental factors such as temperature and dissolved oxygen concentration, usually requiring 20-30 degrees Celsius. Moreover, the microbial anode determines that the power output of this technology is relatively low. The invention's power density has been increased by nearly a hundred times compared to microbial fuel cell technology, and the system is less affected by temperature.