The disposal of solid waste from leather manufacture is a significant issue in the tannery-environment relationship. With reference to the solids balance in the conversion of hides and skins into leather, out of every 1,000 kilos of salted bovine hides only 260 kg are finally converted into leather. Among the remaining solids, 230 kg are in the wet blue state, comprising 100 kg shavings, 110 kg unusable splits, and 20 kg trimmings. In terms of collagen, the yield as leather is 50%, with approximately 34% distributed among wet blue solid wastes. This shows the low efficiency in leather making, but also the potential for reclaiming this waste protein.
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