PCB circuit boards live in the current society and are advocated by the government for advocating green. Energy conservation and environmental protection are equally important. While improving energy efficiency, we will vigorously protect the environment and effectively solve environmental problems. This is an important issue of the global energy development strategy.
At present, most of the advanced treatment of circuit board wastewater in my country only achieves sand filtration and discharge. According to the results of multiple commissioning and the investigation of wastewater treatment facilities of larger circuit board factories in the Pearl River Delta, the copper in the water is precipitated after the above treatment. The ion concentration is generally about 1.5mg/L. After filtration, the copper ions in the effluent still cannot meet the standard. Therefore, in-depth processing must be carried out. The advanced treatment process is generally: activated carbon adsorption and cation exchange after sand filtration. The water used on the circuit board industrial production line is generally divided into three types: pure water, soft water, and general tap water. Sewage treated by the above process can generally be used as cleaning water, and can also be used for watering roads, greening, washing toilets and other purposes.
For the small amount of circuit board wastewater, there is a simple and convenient treatment method. It is generally difficult to discharge wastewater with a small amount of wastewater. At this time, Na2S can generally be used as a heavy metal ion remover, and a simple sewage treatment process of coagulation, reaction, precipitation, and filtration is adopted. However, there is a problem of secondary pollution caused by excessive addition of Na2S.
