To
augment sustainable tanning, less chrome input, high functional
quality leather processed via no restricted substance in processing,
and ease to treat the inevitable protein waste generated are the key
challenge, and currently, they have become the active part of leather
research. Our work covers the synthesis of a formaldehyde-free chromium-incorporated
polymeric tanning agent (FF-CIPTA) and its application in a reformed
leather processing route which ensures near zero discharge of chromium
containing solid waste. The preliminary characterization of FF-CIPTA
reveals that the developed product is stable up to pH 5.2, and the
particle size distribution ranges from 955 to 1450 nm with 12% Cr2O3 content. The present work significantly reduces
the tanning agent input without compromising the thermal stability
(103 °C) of the leather because of its multicrosslinking nature.
Since the product exhibits a polymeric character, it provides tanning-cum-filling
action which in turn reduces the retanning agent consumption in subsequent
processes. Scanning electron microscopic study, porosity analysis,
and hand assessment results clearly indicate the significant improvement
in organoleptic properties. In addition, the process also enjoys the
benefits of zero chromium containing solid waste generation, 71.4%
reduction in chromium input, and high chromium transfer efficiency
(92%) than the conventional process (36%), and 74.4% reduction in
total dissolved solids generation. Furthermore, the water consumption
and chemical input are reduced by 51.6 and 17%, respectively. Reduction
in wastewater treatment cost and a high economic value of chromium-free
leather scraps leads to a cumulative gain of US$ 39.84 per ton of
raw material processing. Overall, a potential and practical applicability
for cleaner and sustainable tanning is well established.