With the rapid development of the electronics industry, the problem of wastewater generated in the manufacturing process of circuit boards is becoming more and more serious. These wastewater contain harmful substances such as heavy metal ions and organic solvents, which pose a serious threat to the environment and human health. Therefore, it is crucial to achieve zero discharge of waste water from circuit boards.
Key technologies. Heavy metal ion removal: chemical precipitation, adsorption and ion exchange methods are used to convert heavy metal ions in wastewater into insoluble precipitates or adsorb them on solid surfaces, so as to achieve the removal of heavy metal ions. Commonly used precipitants include hydroxides, sulfides, etc., and commonly used adsorbents include activated carbon, resins, etc.
Organic solvent**: For the organic solvent contained in the waste water of the circuit board, distillation, extraction and other methods are used for ** and reuse. Through the best organic solvents, it can not only reduce the content of harmful substances in wastewater, but also realize the reuse of resources and reduce production costs.
Membrane separation technology: Membrane separation technology, such as reverse osmosis, nanofiltration, etc., is used to intercept ions, organic matter and other harmful substances in wastewater on one side of the membrane, so as to achieve wastewater purification. Membrane separation technology has the characteristics of high efficiency, energy saving and environmental protection, and is one of the key technologies to achieve zero discharge of circuit board wastewater.
Biological treatment technology: using the metabolic action of microorganisms to convert organic matter in wastewater into harmless or low-toxicity substances. Common biological treatment technologies include activated sludge method, biofilm method, etc.
Advanced oxidation technology: Advanced oxidation technology is an effective solution for difficult-to-treat organic matter and nutrients such as nitrogen and phosphorus. This technology converts organic matter into inorganic substances such as carbon dioxide and water by generating hydroxyl radicals (·OH) with strong oxidizing ability. Common advanced oxidation techniques include Fenton reaction, photocatalytic oxidation, etc.