Abstract
This study aims to determine the extent of chrome in shaving waste that can be recovered and reused for tanning the leather and to reduce environmental pollution. Three kg of chrome shaving waste was hydrolyzed with NaOH by variation of 1, 2 and 3 % respectively in 10 liters of water, at temperature of 100oC for 1 hour. The results solution was then filtered to separate the chrome from the collagen protein . The filtered solids chrome was recovery by concentrated using sulfuric acid. The resulting chrome has Cr2O3 about 11 g/kg of chromium with utiluzation of 2 % NaOH. The recovered chrome was used for tanning goat skin with variation of 0, 30, 40, 50, 60, 70, and 100% respectively from total chrome used for tanning leather. Test result showed that the variation of 60 % met the standard of SNI 0253-2009: Upper leather footwear-goat. The use of recovered chrome reduce environmental pollution.
Keywords: chrome, hydrolysis, shaving waste, tannery, environment protection.
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