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Why Colour Removal is Critical

  • Regulatory ADMI < 50 or visible colour absence.
  • Aesthetic and ecological impact on receiving waters.
  • Azo dyes can cleave into carcinogenic aromatic amines.
  • Coloured effluent damages brand reputation and ESG ratings.
  • Residual colour prevents recycling for sensitive dye lots.

Colour Removal Technologies

Chemical Coagulation / Flocculation

Cost-effective for dispersible dyes and suspended colour.

DAF Flotation

Removes coagulated dye floc with high surface loading rates.

Ozonation

Oxidative bleaching of chromophores without chemical sludge.

Fenton's Oxidation

Hydroxyl radicals for breaking reactive dye bonds.

Activated Carbon (GAC/PAC)

Adsorption of soluble colour and trace organics.

Membrane Filtration

NF/RO for complete colour separation and high-purity permeate.

Our Colour Removal Systems

Modular AOP Skids

Containerised ozone/Fenton reactors for fast installation.

Hybrid Chem-Bio-Physical Trains

Multi-barrier systems combining coagulation, biology, and polishing.

ZDHC-Aligned Design

MRSL-compliant chemical selection and process design.

Automated Colour Monitoring

Online colorimeters for real-time control and compliance reporting.

Typical Results

90–99%

ADMI reduction

Complete

indigo decolorization

Non-detectable

aromatic amines

EU/UK

compliant

Textile Colour Removal Systems

Treatment Challenge

Colour is one of the most visible and regulated parameters in textile effluent. Conventional biological treatment alone rarely achieves sufficient colour removal, particularly for reactive, disperse, and vat dyes that resist biodegradation.

High BOD and COD loads requiring biological treatment
Colour removal to meet discharge consent limits
Variable flow and batch processing operations
Water reuse potential for sustainability targets

Our Solution

Our colour removal systems deploy chemical coagulation, advanced oxidation (ozone, Fenton, or photo-catalytic), and activated carbon adsorption in optimised sequences. Each system is tailored to the specific dye chemistry and discharge limits, achieving >95% colour removal for most textile applications.

Integrated treatment train design
Process-specific chemical optimisation
Automated control with SCADA integration
Compliance with BAT and ZDHC standards

Treatment Process Overview

1

Pre-Treatment

Screening, grit removal, and equalization to protect downstream equipment and balance flows.

2

Chemical Treatment

Coagulation, flocculation, and pH adjustment for solids and colour removal.

3

Biological Treatment

Activated sludge, MBBR, or SBR for BOD and nutrient removal.

4

Polishing & Reuse

Filtration, activated carbon, and optional RO for water recovery.

Related Pages

Advanced Oxidation

Advanced oxidation processes for recalcitrant industrial organics.

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Aop Fenton

Fenton's oxidation for recalcitrant COD, dyes, and toxic organics.

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Aop Ozonation

Ozonation and O3/UV advanced oxidation for Colour removal, odour control, and micropollutant destruction in industrial wastewater.

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Textile Carpet

Textile wastewater treatment for carpet & rug mills.

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Textile Chemical Treatment

Textile wastewater treatment for chemical conditioning and treatment.

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Textile Denim

Textile wastewater treatment for denim manufacturing.

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Need help with colour removal?

Our experts can design a system tailored to your specific requirements.

Industries We Serve

Our expertise spans multiple industries with sector-specific water treatment solutions.