Abstract
The leather tannery industry produces a significant amount of solid chromium waste. Environmental concerns and escalating landfill costs are becoming increasingly serious problems to the leather industry and alternative disposal methods are needed. This research describes the possibility of decrease of the shrinkage temperature and to increase the pH value of leather waste by detoxification treatment with use of tartrate potassium. Through this investigation, we have established that is more possible to reduce the shrinkage temperature and neutralizing the acidity of this waste without his degradation or digestion and with decreasing of his chromium content about 95%. The use of reaction time of 72 h generates the optimal decreasing of the shrinkage temperature of waste leather about 42°C close to the one of hide at native state (before tanning process) which reveal another ecological and simple way for the treatment of the chromium containing leather waste.
Highlights
The production of chromium containing solid wastes in leather industry has been recognized as a real problem for many years[1,2]
Before tanning process the initial shrinkage temperature and the potential hydrogen value of hides is about respectively 40-45°C and pH 7-8[7,8], after tanning the shrinkage temperature increased until 100°C[8] and the pH value decrease of about 3,5-4[7,9,10,11]
Shrinkage temperature before treatment: According to the results showed in Table 1 the majority of value obtained can range between 95 and 101°C
Summary
The production of chromium containing solid wastes in leather industry has been recognized as a real problem for many years[1,2]. According to the criteria of clean technology processes, this present research consists on the research of an innovative method able to treat such solid tanned waste product as shavings, trimmings and splits It based on the research of the reversibility of the tanning phenomenon which can decrease the shrinkage temperature and increase the pH value of waste towards their initial value before tanning process by removing of the chromium from the waste, without degradation or digestion of this latter.
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