recovering chromium from spent chrome waste gained significant importance
in the last decade (Kanagaraj et al., 2008). The recovery of chromium
from spent tanning provides a significant economic advantage
(Belay, 2010). In addition, vegetable tanning is more environmentally
sound than chrome tanning (Kanth et al., 2009), which can be
followed under the ‘layout change’ option, yet vegetable tanning is
not adopted in sample industrial plants.
As per Table 1, a large amount of chromium can be avoided by
adopting the splitting of hides prior to tanning, under the ‘layout
change’ and ‘improving operating conditions’ options, but none of
these have been practiced in the sample plants. In keeping with the
principle of ‘improving maintenance procedure’, it is possible for
the tanning plants to reduce pollution in the re-tanning, dyeing and
fat-liquoring stages by following good housekeeping. In addition,
overdosing of dye can be avoided under the ‘material handling and
storage’ option to minimize the generation of pollution, and the
sample plants employ this approach. In the finishing stage, the
water-based liquors can be followed instead of solvent-based
liquors under the ‘improving operating conditions’ option, but
this approach has not been followed by the sample plants.
recovering chromium from spent chrome waste gained significant importance
in the last decade (Kanagaraj et al., 2008). The recovery of chromium
from spent tanning provides a significant economic advantage
(Belay, 2010). In addition, vegetable tanning is more environmentally
sound than chrome tanning (Kanth et al., 2009), which can be
followed under the ‘layout change’ option, yet vegetable tanning is
not adopted in sample industrial plants.
As per Table 1, a large amount of chromium can be avoided by
adopting the splitting of hides prior to tanning, under the ‘layout
change’ and ‘improving operating conditions’ options, but none of
these have been practiced in the sample plants. In keeping with the
principle of ‘improving maintenance procedure’, it is possible for
the tanning plants to reduce pollution in the re-tanning, dyeing and
fat-liquoring stages by following good housekeeping. In addition,
overdosing of dye can be avoided under the ‘material handling and
storage’ option to minimize the generation of pollution, and the
sample plants employ this approach. In the finishing stage, the
water-based liquors can be followed instead of solvent-based
liquors under the ‘improving operating conditions’ option, but
this approach has not been followed by the sample plants.
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