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Keysino addresses indigo dye recycling challenges in denim textiles through its innovative membrane separation technology and biological methods, utilizing microorganisms to degrade indigo into harmless substances. Overcoming traditional limitations of low dye recovery (98% achieved) and persistent Chemical Oxygen Demand (COD)/chromaticity issues, the customized KS Indigo Separation System ensures <2% fabric damage while enabling >5 reuse cycles of recycled dyes. This solution reduces treatment costs by 40%, decreases wastewater COD by >70%, and advances the industry toward zero-discharge objectives through enhanced resource circularity and economic efficiency.