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The tanning industry, involved in transforming raw hides and skins into leather, is a major contributor to environmental pollution. The sources of pollutants in this industry can be categorized into air, water, and solid waste. These pollutants primarily result from the chemicals and processes used during tanning, which include the application of toxic substances and the disposal of byproducts.

One of the main pollutants in the tanning industry is wastewater. During the tanning process, large quantities of water are used, and this water becomes contaminated with harmful chemicals such as chromium, ammonia, sulfur, and various dyes. Chromium-based compounds, particularly hexavalent chromium, are widely used in tanning as they help stabilize the leather. However, these compounds are toxic and carcinogenic, making the wastewater hazardous. When untreated wastewater containing these chemicals is discharged into rivers or groundwater, it leads to severe environmental degradation, affecting both aquatic life and human health.

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