Tannery wastewater refers to the wastewater generated in the preparation and tanning stage of leather production, i.e. in the wet operation process. The wastewater from leather factory has large discharge scale, high pH value, high chorma, various pollutants and complex components. The main pollutants include chromium, soluble protein, dander, suspended matter, tannin, lignin, inorganic salts, oils, surfactants, dyes and resins.

The traditional leather wastewater treatment adopts flocculation, precipitation, then biochemical process. But the effluent after biochemical treatment is difficult to reduce the concentration of organic matter to a low level, and the remained pollutants in biochemical effluent are poor biodegraded. The discharged can be qualified treatment with  LANGANTAI LCO catalytic oxidation and BAF aerated filter for advanced degradation.