Results WP 05.06.8 Tests for water re-use

re-use scheme

effluent of acid dyeing (B03)

re-use permeate acid dyeing dyeing of polyamide: light and dark colour reference, 75% permeate, 100% permeate fastness to washing and to rubbing no differences >0.5 colour difference: no differences >0.8 conclusion: quality of permeate OK for re-use pH is controlled during dyeing

effluent of dispers print (B03)

re-use permeate dispers print dyeing of polyester: light and dark colour reference, 75% permeate, 100% permeate fastness to washing and to rubbing no differences >0.5 colour difference: no differences >0.8 conclusion: quality of permeate OK for re-use no adaptation is needed

effluent of reactive dyeing (B04)

re-use permeate reactive dyeing (1) dyeing cotton with reactive dyes: light and dark colour reference, 75% permeate, 100% permeate fastness to washing and to rubbing no differences >0.5 colour difference: light colour: differences >0.8 dark colour: no differences >0.8 conclusion: permeate: too high pH and conductivity pH: easy to adapt / conductivity:analysis needed

re-use permeate reactive dyeing (2) dyeing cotton with direct dyes: medium and dark color reference, 75% permeate, 100% permeate fastness to washing and to rubbing no differences >0.5, except 1 (washing) colour difference: both colours: differences >0.8 conclusion: permeate: too high pH and conductivity pH: easy to adapt / conductivity:analysis needed

effluent of bleaching (B04)

re-use permeate bleaching bleaching cotton with hydrogenperoxide reference, 75% permeate, 100% permeate polymerisation degree no differences degree of whiteness: conclusion: quality of permeate OK for re-use no adaptation is needed

re-use permeate bleaching dyeing cotton with direct dyes: light colour reference, 75% permeate, 100% permeate fastness to washing and to rubbing no differences >0.5, colour difference: no differences >0.8 conclusion: quality of permeate OK for re-use no adaptation is needed