What are the characteristics of the regulated waste streams in the tanning industry?

The characteristics of regulated waste streams in the tanning industry commonly include high levels of salts, high biochemical oxygen demand (BOD), and significant amounts of suspended solids. In the tanning process, particularly when using processes such as chrome tanning, large volumes of water are used along with various chemicals.

Salts are generated from chemicals used in tanning, especially chromium salts, which can be present in significant quantities. The BOD is elevated due to the organic matter present in the wastes from raw hides and the chemicals used, making it vital for wastewater treatment systems to be equipped to handle such high loads. Suspended solids come from the solid waste materials and fibers detached during the preparation and tanning of hides, contributing to the overall turbidity of the water.

These characteristics pose challenges for treatment processes and regulatory compliance, which is why understanding them in the context of the tanning industry's wastewater management practices is critical for effective environmental protection and regulatory adherence.