A new method was developed to clean up air pollution and treat wastewater at the same time. By using a special system, sulfur dioxide from factory emissions can be turned into a useful substance for cleaning water. This process can make a lot of sulfur dioxide disappear in just a small amount of water. By using this method, wastewater can be treated to a very high standard. The researchers tested the system and found it to be effective, and they estimated the cost of setting it up.