D4 – Textile wastewater treatment

D4a Demonstrating anaerobic treatment of desizing wastewater

Partner: FiW, A3, ISWA in cooperation with KML and NUST


Objective
The goal of the pilot-scaled wastewater treatment demonstration is to provide practical data on the effectiveness of anaerobic (pre-)treatment of selected wastewater streams from textile finishing plants and the resulting biogas production. Beyond demonstrating the technology and its merits, the gathered data will be used to analyze the financial viability of a full-scale implementation at textile finishing plants.

Present Results
Over the course of the last several months, the pilot plants helped to evaluate the effectiveness of anaerobically treating starch-rich waste water from the desizing process, with view to both the treatment performance as well as the biogas yield.

Outcome
The demonstration project D4a has proven successful: biogas could successfully be produced by anaerobically treating the textile waste water.

Further Research
The collected data is currently under review. It will allow the quantification of the reduction in downstream wastewater treatment costs and will serve as a basis for a cost/benefit analysis. The required investment in full scale anaerobic wastewater pre-treatment plants in the Pakistani textile industry can hence be evaluated. The data will be published in scientific journals. are sufficient to justify.

 

D4b Demonstrating water recycling using ultrafiltration

Partner: FiW, A3 in cooperation with NUST


Objective
The goal of ultrafiltration (UF) testing rig is to demonstrate and provide further practical data on the effectiveness of UF treatment of selected wastewater streams from textile finishing plants for reuse in the textile production process.

Present Results
The UF testing rig has been assembled and tested and will be shipped together with the anaerobic pilot treatment plant to Pakistan in early 2018. First operation results are expected in April/May 2018.

Expected Outcome
The demonstration project D4b will show in which cases the reuse of UF filtered wastewater in the textile finishing processes is sensible and justifies the investment in full-scale UF plants.

 

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 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.

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