Last Updated: August 2026 | Reading Time: 12 minutes
Introduction
Textile wastewater chemicals address the complex, high-strength effluent from dyeing, printing, and finishing operations characterized by intense color, high COD (500 to 5000 mg/L), dissolved salts, and variable pH. Key chemical solutions include poly aluminium chloride (PAC) for coagulation of dye particles and colloids, polyacrylamide (PAM) for flocculation and sludge dewatering, decolorizing agents for dye removal, and activated carbon for polishing residual color and organics. The textile wastewater chemicals portfolio must handle reactive, disperse, acid, and direct dye classes, each with distinct treatment requirements. Advanced oxidation chemicals (Fentons reagent, ozone, hydrogen peroxide) degrade recalcitrant chromophores when coagulation alone is insufficient. This guide presents a systematic chemical treatment framework for textile effluent, covering coagulant selection, dosing optimization, decolorization chemistry, and cost-effective combined processes to meet discharge color and COD standards.
Wastewater Characteristics
| Parameter | Typical | Limit |
|---|---|---|
| COD | 500-5,000 mg/L | < 300 |
| BOD | 200-2,000 mg/L | < 100 |
| TSS | 200-2,000 mg/L | < 50 |
| pH | 4-10 | 6-9 |
Treatment Process Flow
- Equalization & pH adjustment
- Coagulation (PAC + PAM)
- Sedimentation/DAF
- Biological treatment
- Advanced treatment
- Disinfection
- Sludge dewatering (CPAM)
Recommended Chemicals
| Chemical | Role | Dosage |
|---|---|---|
| PAC | Coagulant | 50-300 mg/L |
| PFS | Coagulant | 30-200 mg/L |
| APAM | Flocculant | 0.5-5 mg/L |
| CPAM | Sludge | 3-8 g/kg |
| Activated Carbon | Adsorbent | 50-500 mg/L |
Chemical Dosing Guide
| Stage | Chemical | Dosage | pH | Efficiency |
|---|---|---|---|---|
| Coagulation | PAC 30% | 50-300 mg/L | 5.5-8.0 | 30-55% COD |
| Coagulation | PFS | 30-200 mg/L | 4.5-8.0 | 40-60% COD |
| Flocculation | PAM | 0.5-5 mg/L | 6-9 | Improves settling |
| Adsorption | Carbon | 50-500 mg/L | 5-9 | 20-80% COD |
Cost Analysis
| Method | Capital | Operating | Best For |
|---|---|---|---|
| Coagulation | $50-150 | $0.10-0.30 | Suspended solids |
| Biological | $100-250 | $0.05-0.20 | Biodegradable COD |
| Fenton AOP | $80-200 | $0.30-1.00 | Refractory COD |
| Activated Carbon | $50-150 | $0.20-0.80 | Polishing |
FAQ
What chemicals are used in this industry’s wastewater treatment?
Main chemicals: PAC for coagulation (50-300 mg/L), PAM for flocculation (0.5-5 mg/L), activated carbon for adsorption (50-500 mg/L), TCCA for disinfection (5-20 mg/L).
How is this industry wastewater typically treated?
Standard: equalization, chemical coagulation (PAC+PAM), sedimentation/DAF, biological treatment, advanced treatment, disinfection.
What are typical wastewater characteristics?
Typical: COD 500-5,000 mg/L, BOD 200-2,000 mg/L, TSS 200-2,000 mg/L, pH 4-10. Jar testing with actual wastewater is essential.
How to reduce treatment cost?
Maximize biological treatment, optimize coagulant dosage via jar testing, use PAC+PFS blend, implement source reduction. HydroChemix provides free consultation.
Need Expert Help?
HydroChemix provides free technical consultation, jar testing support, and free samples. Our engineers help you select the right chemical and optimize treatment.
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