WASTE MANAGEMENT IN LEATHER INDUSTRY

45 586.5.1 High Exhaustion(Blackman A., (2005)) Using special inputs and procedures to ensure thatmore of the chrome in the tanning bath actually affixes to the hide, and lessends up in waste streams. Although this technique requires a more expensivetype of chrome (self- basification) and a longer soaking period, it offerssignificant cost shavings due to reduced overall use (UNEP 1991)6.5.2 Enzyme InTthe Dehairing BathSubstituting biodegradable enzymes for lime and sodium sulfide.6.5.3 Recycling The Dehairing BathSaving and reusing the contents of the dehairing bath instead of dischargingit all into the sewer after a single use. This simple technology requires onlyfixed investments in a holding tank, a pump, and a filtering system to removesuspended solids (usually a simple wire mesh screen). Because the chemicalinputs into the dehairing bath are relatively inexpensive, only minor costsavings accompany the environmental benefits.6.5.4 Recycling In The Chrome Tanning BathReusing contents of the tanning bath instead of discharging them into thesewer after a single use. Like recycling the dehairing bath, this simpletechnology requires only fixed investments in a holding tank, a pump, and asimple filter. It can reduce chrome use by up to 20%. (UNEP 1991). [BlackmanA., ( 2005), Adaption of Clean Leather- Tanning Technologies in Mexico]