What is a primary environmental issue with the tanning industry?

The primary environmental issue with the tanning industry is the high levels of suspended solids and salts produced during the process. Tanning involves the use of various chemicals, including heavy metals like chromium, and the treatment of animal hides can lead to the release of solid waste materials. These suspended solids can contaminate water bodies, negatively affecting aquatic ecosystems by reducing light penetration and oxygen levels, which are essential for aquatic life.

Additionally, salts used in the tanning process can lead to high salinity in wastewater discharges, which can harm plants and aquatic organisms. This makes the treatment and management of wastewater in the tanning industry crucial to prevent environmental degradation and protect water quality. The presence of excessive suspended solids and salts is a significant concern for regulators and environmentalists working to mitigate the impacts of this industry on the environment.