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

Partner: FiW, CHT, Thies

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 experiments suggest that implementing the optimized process in a textile finishing plant will only improve wastewater emissions in cases where no wastewater treatment plant is in operation, which is unfortunately the case in most Pakistani finishing plants as of 2017. At plants with operating wastewater treatment, 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.

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. Therefore further innovative wastewater treatment concepts, such as presented in D4a and D4b.