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Industrie

Traitement des effluents textiles

Élimination de la couleur, de la DCO et des sels pour les opérations de teinture textile, de finition et de lavage de denim.

🤖 Aperçu IA

Les effluents textiles contiennent une DCO élevée (500-2 000 mg/L), une couleur intense des colorants, une salinité élevée des bains de teinture et des métaux toxiques des mordants. BioTerraVa conçoit des systèmes biologiques intégrés, physico-chimiques et d'oxydation avancée qui assurent la conformité avec les règlements d'égouts municipaux et les permis de rejet direct.

Défis industriels

Textile Effluent Treatment Challenges

Textile dyeing and finishing generates complex effluent with multiple contaminants that challenge conventional treatment. Dye molecules are designed to be stable and resistant to degradation, making colour removal particularly difficult.

  • High COD from dyes, sizing agents, and surfactants
  • Intense colour (1,000-10,000 PCU) from reactive, disperse, and vat dyes
  • High salinity (TDS 5,000-20,000 mg/L) from dye baths
  • Heavy metals (chromium, copper, zinc) from mordants and catalysts
  • Variable pH from acid and alkaline dyeing processes

Solutions BioTerraVa

Textile Effluent Treatment Solutions

BioTerraVa designs textile effluent treatment systems that address the unique challenges of dyehouse wastewater. Our designs combine biological treatment for COD removal, chemical coagulation for colour, and advanced oxidation for recalcitrant dye molecules.

  • Equalization and pH neutralization for batch discharge buffering
  • Biological treatment (MBBR or activated sludge) for COD/BOD removal
  • Chemical coagulation-flocculation with alum or ferric for colour removal
  • Advanced oxidation (Fenton, ozone, or photocatalytic) for refractory dyes
  • Tertiary filtration for final solids removal and polishing

Conformité

Textile Industry Compliance Requirements

Textile facilities must comply with municipal sewer bylaws (for indirect dischargers) or NPDES/direct discharge permits. In Ontario, O. Reg. 537/93 applies to industrial sewage works. Colour is often regulated through local bylaws with specific PCU limits.

  • Municipal sewer bylaws (BOD < 300 mg/L, TSS < 350 mg/L typical)
  • Colour limits (50-250 PCU in many municipalities)
  • Provincial effluent regulations (O. Reg. 537/93 in Ontario)
  • US EPA NPDES permits for direct dischargers
  • Heavy metals limits for electroplating and dyeing operations

Étude de cas

Denim Washer Achieves 98% Colour Removal and 92% COD Reduction

Problème : A denim washing facility in Montreal was paying $25,000/month in municipal sewer surcharges due to COD exceedances (1,800 mg/L vs. 300 mg/L limit) and colour violations (1,200 PCU vs. 100 PCU limit).

Solution : BioTerraVa designed: equalization + MBBR biological treatment + Fenton's reagent oxidation for colour + clarifier + sand filtration.

Résultats : COD reduced from 1,800 to 140 mg/L (92% removal). Colour reduced from 1,200 to 25 PCU (98% removal). Monthly surcharges eliminated. Sludge volume reduced 40% through optimized biological process.

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FAQ

Questions fréquemment posées

How to remove colour from textile effluent?

Textile colour removal requires a combination of approaches: (1) Chemical coagulation with alum or ferric chloride precipitates dye molecules, (2) Advanced oxidation (Fenton's reagent, ozone, or photocatalytic processes) breaks dye chromophores, (3) Adsorption on activated carbon or clay removes residual colour, and (4) Biological pre-treatment reduces COD to improve chemical treatment efficiency. BioTerraVa typically designs two-stage systems: biological COD removal followed by chemical coagulation or AOP for colour.

What is the best treatment for textile dyeing wastewater?

The best treatment for textile dyeing wastewater combines: equalization for batch discharge buffering, biological treatment (MBBR preferred for shock load resistance) for COD/BOD removal, chemical coagulation-flocculation for colour and TSS removal, and advanced oxidation for refractory dyes. For facilities with high salinity (>10,000 mg/L TDS), biological treatment may need to be supplemented with physical-chemical processes. BioTerraVa customizes each design based on dye types, production volumes, and discharge requirements.

How much does textile wastewater treatment cost?

Textile wastewater treatment costs range from $2-6 per m³ for small dyehouses to $1-3 per m³ for large integrated mills. Capital costs are $4,000-$12,000 per m³/d of capacity. The highest cost drivers are: chemical coagulants for colour removal (30-40% of O&M), sludge disposal (20-30%), and energy for aeration (15-25%). BioTerraVa optimizes designs to minimize chemical use and sludge production.

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