The researchers used a process called Fenton oxidation to clean wastewater from the alcohol industry. They found that adding the right amount of hydrogen peroxide (H2O2) was most important for removing pollutants. Keeping the pH around 3.0, using a 1:1 ratio of iron (Fe2+) to H2O2, and a 30-minute reaction time with 660 mg/L of H2O2 gave the best results, removing 95% of the pollutants. After treatment, alcohol, ketone, phenol, and cyclic hydrocarbon levels decreased, while acid, ester, and aldehyde levels increased.