1. Results WP
Tests for water re-use

6. re-use scheme

7. effluent of acid dyeing (B03)

8. 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

9. effluent of dispers print (B03)

10. 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

11. effluent of reactive dyeing (B04)

12. 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

13. 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

14. effluent of bleaching (B04)

15. 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

16. 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