Textile Wastewater Decolorization Troubleshooting Guide
Troubleshooting guide for textile wastewater color removal problems such as poor decolorization, weak flocs, high dosage and unstable results. Use this page when jar-test or plant operation results are not stable.
Common problems and adjustments
| Problem | Possible reason | What to test next |
|---|---|---|
| Poor color removal | Dosage too low, pH unsuitable, wrong chemical match | Test dosage ladder and pH range. |
| Flocs are loose | PAC/PAM not optimized or mixing is wrong | Adjust PAC/PAM and mixing sequence. |
| High COD remains | Color removal chemical is not a full COD solution | Check biological/oxidation/coagulation process. |
| Result changes daily | Production batch or dye recipe changes | Collect samples from different time periods. |
Recommended troubleshooting workflow
Confirm if dyeing, printing or washing recipe changed.
Test fresh samples with dosage ladder and pH adjustment.
Compare decoloring agent only vs decoloring agent + PAC/PAM.
What to send for technical support
Send photos of raw wastewater, treated water, floc/sludge condition, pH, COD, existing chemicals, dosage and treatment flow. These details help quickly identify whether the issue is color removal, coagulation, flocculation or process operation.
Troubleshooting FAQ
Why does color return after treatment?
Possible reasons include wrong pH, insufficient reaction, unstable wastewater composition or interference from auxiliaries. Jar test should simulate actual operation.
Why are flocs too small?
PAC or PAM dosage/order may need adjustment. Slow mixing and settling time also affect floc size.
Why does dosage suddenly increase?
Dye type, production recipe, wastewater concentration or upstream process may have changed. Retest with fresh wastewater sample.
Related technical pages
Need help selecting the dosage?
Send wastewater source, color, pH, COD, current treatment process and target discharge standard. We can suggest water decoloring agent, PAC and PAM testing direction.