Leather and fur processing wastewater treatment

According to the market demand trend of the leather and fur processing industry, the operation scale of the industry is constantly expanding. Therefore, a series of pollutants will be generated in the production process, affecting the surrounding ecological environment. The pollutants discharged from the leather and fur processing industry include COD, petroleum, total chromium, etc. The discharge of these pollutants will cause certain harm to the atmosphere, water and ecological environment.

The types of wastewater from the leather and fur processing industry include Liming and deashing wastewater, tanning wastewater, water degreasing wastewater and other wastewater, which are complex in composition and difficult to treat. Commonly used leather and fur processing wastewater treatment technologies include coagulation sedimentation technology, acidification hydrolysis technology and biological contact oxidation technology.

Coagulation sedimentation technology is a kind of wastewater treatment technology for the treatment of chromium containing wastewater. It is generally used in combination with adsorption method to treat chromium containing wastewater. Generally, the alkali precipitation method is used for wastewater treatment. When alkali is added to adjust the pH to 8.0-8.5, chromium hydroxide precipitation will be generated. The chromium hydroxide precipitation can be reduced to basic chromium sulfate in strong acid medium. Basic chromium sulfate is the main component of tanning solution, so it can be reused.

Acidification hydrolysis refers to the biochemical reaction of macromolecular organic matter to be decomposed outside the cell before entering the microbial cell. Acidification hydrolysis technology can be combined with other processes to reduce the treatment cost and improve the efficiency of wastewater treatment.