Dyeing Wastewater Treatment and Effluent Standards
topic
Polyester dyehouse effluent contains: residual disperse dye (colour, COD), dispersants (anionic surfactants, BOD), carrier chemicals (toxic aromatics), acetic acid (BOD), and reduction clearing chemicals (hydrosulphite oxidation products). Treatment: biological treatment (poor for disperse dyes — hydrophobic, non-biodegradable), coagulation/flocculation (removes dye particles), ozonation or advanced oxidation processes (AOPs: UV/H₂O₂, Fenton) for colour removal. Effluent standards: ZDHC MRSL, GOTS, bluesign® chemical protocols.
Role
Dyehouse effluent management is a major environmental challenge in polyester processing. Understanding treatment technologies, effluent standards, and the ecological profile of disperse dyes and dispersants is essential for sustainable textile production.