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Tanning is an integral part of leather making process, which converts the raw hides and skins to finished leather, which is used for manufacturing various leather goods. Tanning industries can be classified into two categories with respect to the kind of tanning practised: vegetable or EI tanning and chrome tanning.
The
effluent generated from the leather tanning process contains very
high TDS, chromium (where chrome tanning is practised),
high BOD & COD. The practice to reduce TDS in effluent
has been to segregate soak liquor and to minimise the
total volume by evaporation.
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