D4c: Comparing wastewater treatment from conventional and water-efficient dyeing processes

Partner: FiW, CHT, Thies

Objective

The goal of the lab-scaled wastewater treatment tests was to provide an initial evaluation of the effectiveness of standard wastewater treatment technologies on the wastewater from the optimized processes using “Bezaktiv GO” dyestuffs in comparison to the processes and dyestuffs currently in use at Style Textile.

Present Results

  • The water input could be reduced by a significant margin
    (~30% reduction)
  • The processing time could be reduced significantly
    (~1h saving)
  • Hence, a high potential for energy savings could be identified
  • Fabric appearence almost unchanged

Conclusion

The demonstration project D4c suggests that, although greatly reducing their environmental impact by saving water and energy (as shown in D2 & D3), the optimized processes and chemicals do not reduce the need for proper treatment, nor do they reduce wastewater treatment costs significantly. Improvements were observed fortextile mills that do not operate a functioning wastewater treatment plant. This is, however, unfortunately the situation in most cases. If wastewater treatment plants were installed, the measured parameters suggest no improvements or even higher emissions in the optimized than in the standard process for the production of the same amount of textiles. Therefore further innovative wastewater treatment concepts, such as presented in D4a and D4b.