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Fabric treatment in alkaline solutions leverages hydrolysis and erosion effects to impart silk-like luster and soft texture, generating alkali-decrement wastewater characterized by high pH (10-12), elevated COD levels (8,000-12,000 mg/L), and refractory pollutants like terephthalic acid (TA) with poor biodegradability. Wastewater quality and volume exhibit significant variations depending on processing methods and operational adjustments.

TA, a critical raw material for polyester and plasticizer production, suffers from low recovery purity (<85%) in conventional methods. Keysino’s KS-C purification system, combined with acid precipitation, recovers 99%-pure TA from alkali-decrement liquors while eliminating >65% of pollutant loads. This technology not only enhances TA's reusability but also reduces downstream treatment burdens, cutting wastewater handling costs by 40-50% and aligning with circular economy standards for textile chemical management.