Purification of highly concentrated wastewater from tanneries

The relevance of the study is due to the need to purify industrial wastewater generated from the treatment of animal skin to the MPC indicators that allow such water to be taken into the city’s general sewage network. In recent years, the technology of the production processes of tanneries has undergone significant changes, which has led to the formation of wastewater with higher concentrations of pollutants, including chromium. The purpose of the study is to determine the effectiveness of methods and technology of wastewater treatment of leather production. The paper studies the methods and processes of cleaning, allowing to provide regulatory results, as well as the experience of operating treatment facilities of tanneries. A variant of separation of effluents from the process of ashing, followed by oxidation of sulfides before discharge into the CNS, is considered. Data collection was carried out at a tannery in Yaroslavl. The production technology was studied, wastewater sampling was carried out and laboratory tests were carried out at various stages of the leather processing process. The scheme of treatment facilities is considered, sampling of incoming wastewater for treatment and wastewater of treated waters is carried out. The analysis of the results of wastewater treatment is carried out, the research data are presented, on their basis conclusions are formed on the effectiveness of the applied method of wastewater treatment of leather production.