Industry
Textile Effluent Treatment
Colour, COD, and salt removal for textile dyeing, finishing, and denim washing operations.
🤖 AI Overview
Textile effluent contains high COD (500-2,000 mg/L), intense colour from dyes, high salinity from dye baths, and toxic metals from mordants. BioTerraVa designs integrated biological, physical-chemical, and advanced oxidation systems that achieve compliance with municipal sewer bylaws and direct discharge permits.
Industry Challenges
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
BioTerraVa Solutions
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
Compliance
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
Case Study
Denim Washer Achieves 98% Colour Removal and 92% COD Reduction
Problem: 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.
Results: 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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Technologies
FAQ
Frequently Asked Questions
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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