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Knit Processing Wastewater Issues

  • Scouring baths contain knitting oils and anti-static agents.
  • High O&G from synthetic and natural lubricants.
  • Reactive and disperse dyeing creates colour and salt.
  • Softening/silicones add persistent organics.
  • Hot, intermittent discharges.
  • Synthetic microfiber shedding.

Knit-Specific Treatment

Oil-Water Separation

DAF and coalescing separators for knit oil removal.

Screening

Drum screens for fibre and microfiber capture.

Equalization

Cooling and blending hot scour effluents before advanced biological treatment.

Biological Treatment

SBR or MBBR for surfactant and organic degradation.

Colour Removal

Coagulation and/or ozonation for dyehouse effluent.

Microfiber Filtration

Self-cleaning filters and UF for microplastic capture.

Our Knit Solutions

O&G Guarantee

<15 mg/L O&G to protect downstream biology.

Microfiber Capture

Screen and filter combinations for synthetic fibre recovery.

Heat Recovery

Heat exchangers on hot scour effluents to cut energy bills.

Compact Footprint

Vertical MBBR and lamella clarifiers fit tight mill spaces.

Compliance & Results

>95%

colour removal

<15 mg/L

O&G

60–80%

water reuse

>90%

microfiber capture

Knit Fabric Wastewater Treatment

Treatment Challenge

Knit fabric dyeing and finishing generates wastewater with high BOD (500-2,000 mg/L), elevated COD, and significant colour from reactive dyes. The effluent contains high levels of salts, surfactants, and auxiliary chemicals that require specialised treatment approaches for effective colour removal and water reuse.

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 knit fabric treatment systems combine equalization, chemical precipitation, and biological treatment with optional membrane filtration for water recovery. We size each system based on your specific dye recipes, production volume, and discharge or reuse requirements.

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

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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 Colour Removal

Textile wastewater treatment for Colour removal.

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Need help with knit fabric processing?

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.