Subject
Curing
Fresh hides and skins No salt pollution in soaking
Chilling No salt pollution in soaking
Partial salt elimination Lower salt pollution (20%)
Antiseptics Lower toxicity
Soaking
Antiseptics Lower toxicity
Fleshing Upgrading waste and lower chemicals consumption
Unhairing-liming
Enzymatic treatment Lower toxicity and organic pollution
Hair saving methods Lower nitrogen and organic pollution
Direct recycling Lower chemicals and organic pollution
Splitting of limed pelts Upgrading waste and lower chemicals
Deliming
Carbon dioxide Less nitrogen (-40%)
Weak acids Less nitrogen
Tanning
Pickling float recycling Lower salt pollution
Solvent free degreasing Lower toxicity (75%) and COD
Wet white production Upgrading waste
Tanning float recycling Chromium recovery (90%)
Partial recycling Partial chromium recovery (60%)
Precipitation method Total chromium recovery (99%)
Improvement in exhaustion Good chromium uptake (95%)
Other mineral tanning No chromium tanning
Three compartments drums Improvement in chromium recovery
Vegetable tanning
Dry drum Good vegetable tanning uptake (95%)
Close circuit in pits No effluent process and lower COD
Dyeing
Environmentally acceptable chemicals No heavy metals and lower AOX
Three compartments drums Better uptake of chemicals
Through feed machine No dyes in effluents
Finishing
Water based finishes No VOC emissions
Roller coating Better uptake of chemicals
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Subject Chemical Equipment Technology
Curing
Fresh hides and skins *
Cooling * *
Partical salt elimination *
Antiseptics *
Soaking
Antiseptics *
Fleshing *
Unhairing-liming
Enzymatic treatment *
Hair saving methods * *
Direct recycling * *
Splitting of limed pelts *
Deliming
Carbon dioxide * *
Weak acids *
Tanning
Pickling float recycling * *
Solvent free degreasing * *
Wet white production * *
Tanning float recycling * *
Partial recycling * *
Precipitation method * *
Improvement in exhaustion * *
Other mineral tanning *
Three compartments drums * *
Vegetable tanning
Dry drum *
Close circuit in pits * *
Dyeing
Environmentally acceptable chemicals *
Three compartments drums * *
Through feed machine * *
Finishing
Water based finishes *
Roller coating *
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