Which industry is associated with high BOD, salts, and suspended solids?

The tanning industry is associated with high biochemical oxygen demand (BOD), salts, and suspended solids due to the various processes involved in the treatment of animal hides. During the tanning process, large amounts of water are used, and chemicals such as chromium salts are often employed to preserve the hides. This not only contributes to elevated levels of salts but also generates significant amounts of organic material that leads to high BOD. The presence of suspended solids arises from the residue left behind after the tanning process, which includes bits of hides and chemical byproducts.

The tanning industry's waste is particularly problematic as it can lead to severe environmental impact if not appropriately treated before being discharged into wastewater systems. It is critical for wastewater treatment facilities to effectively manage and treat the effluent from this industry to minimize its effect on water quality and aquatic life. Other industries mentioned, while they may also generate wastewater with certain pollutants, typically do not have the same combination of high BOD, salts, and suspended solids as the tanning industry does.