Usually waste etching solution ( Cu content is 140 -160g/l ) is first stored in sealed pool or pot then deliver to related company for handle. The related company may be approved by local government environment management department or may be they are self-employed labor without qualification in recycling wastage.

There are a few companies equipped with etching machine with extra professional regenerating unit to recycle copper. After adding a few chemical, the waste etching solution can be regenerated and reused into production. But such a machine is not so popular in China PCB industry because it costs more than several hundreds thousand us dollar each set to import, with complex procedure during custom clean.

Through our analysis and research in different sections, PCB industry is metal-consuming industry and looked as serious environment pollution industry but also industry containing most metal resource. That is to say reasonable recycling and regeneration of heavy metal equals to developing resources and wealthy. Expensive metal like gold silver , palladium, rhodium, Cheaper metal like copper and tin, etc. Among them, etching solution which has the biggest volume is worthiest to recycle. How to choose proper advanced technology to do copper recycling and waste solution regeneration? It's easily-polluted to use traditional technology. It's too expensive to buy imported equipment. After consideration over and over again, we decide to adopt extracting technique to separate Cu+ in waste solution in order to recycle copper and regenerate solution. The best advantage of this technique is that it will not break down the balance after extracting which give a good basis for regenerating waste solution. The waste etching solution being extracted copper can be reused in production line by adding a few etching salt and ammonia water and adjusting technical reference data, which save production cost and improve competence of enterprise. However, the extracting and recycling is finished with CuSO4 solution at the same time. We can get cathode electrolytic copper by electrolytic CuSO4. While making pollution source to money, we reduce the load for waste water treatment plant and we attain win-win yield for economy and environment protection. We see there is a prosperous development in future.