Work

Enhancing Membrane Distillation for Textile Wastewater Treatment: A Systematic Investigation of Operational Parameters and Dye Class Influence

Year: 2026

Type: article

Abstract: A rotatable central composite design was employed to optimize the operational parameters for textile wastewater treatment via Direct Contact Membrane Distillation. Using synthetic dye solutions (disperse and reactive classes) and a polytetrafluoroethylene (PTFE) membrane, this study systematically analyzed the effects of feed and permeate flow rates and feed temperature on permeate flux. Interaction effects were identified, and response surface curves revealed that, despite specific variations between dye classes, the optimal conditions were identical (feed flow rate = 4.0 L.min⁻¹, permeate flow rate = 1.0 L.min⁻¹, feed temperature = 84 °C). Water quality analysis showed color rejection exceeding 99% in both cases, demonstrating robust performance across different conditions. Statistical validation confirmed the model’s reliability, with high coefficients of determination (R2= 0.93 for reactive dye, R2= 0.95 for disperse dye). Tests with real wastewater under optimized conditions showed membrane wetting in cotton dyeing effluents due to high chemical concentrations, whereas polyester dyeing wastewater achieved a permeate flux of 40.6 kg.m⁻².h⁻¹ with over 99% color rejection. Membrane characterization confirmed surface stability and the integrity of functional groups. This study highlights the distinct influences of operational conditions on permeate flux across dye classes. Quantifying these effects through statistical analysis, it enables a comparative evaluation of their impact. Finally, it provides valuable insights for implementing membrane distillation in the textile industry, optimizing operational variables to improve wastewater treatment efficiency and reduce costs. Optimal DCMD conditions identified for reactive and disperse dye treatments. Feed temperature is twice as influential, regardless of the dye class. Flow rate synergy is uniquely critical for optimizing reactive dye solutions. Statistical analysis confirms high color rejection across all parameters. Real polyester wastewater tests successfully validate the statistical model.

Source: Water Conservation Science and Engineering

DOI: 10.1007/s41101-026-00519-8

Authors: Regilene de Sousa Silva, Rita de Cassia Siqueira Curto Valle, Ricardo Antonio Francisco Machado, Cintia Marangoni

Institution: Universidade Federal de Santa Catarina

Language: English

Topic: Membrane Separation Technologies

Subfield: Water Science and Technology

Field: Environmental Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Responsible consumption and production

Open Access status: hybrid

Estimated APC paid: $3,290