Effluent Treatment Plant for Textile Dyeing Units

532

Textiles have one of the largest water footprints. Dyeing is a big problem both in terms of water use and pollution. It’s not realistic to stop dyeing and eliminate mass-market products such as cotton and polyester. The Industry’s challenge, therefore, is to adopt more water-friendly technologies and to effectively treat the water it uses.

While Industry is continuously trying to adopt modern processes to reduce water consumption, we at EROS, are helping them to treat the polluted water generated by them and therefore minimizing the impact of water use.

Eros Envirotech (P) Ltd., is a Ludhiana (India) based environmental engineering company engaged in providing turnkey solutions for pollution control to the industry in textile/ yarn dyeing and other fields for over a decade now.

We provide comprehensive and reliable solutions to the industry within cost and time parameters. Further, our design and project execution skills help us to engage clients meaningfully to understand their requirements and deliver on them.

Steps involving discharge of water in different dyeing processes

Polyester Cotton

Typical Waste Water Treatment Process

Waste Water Treatment in Textile Dyeing is a multi-stage process. They can be broadly classified as:

  • Preliminary & Primary Treatment: Physico-Chemical treatment leading to reduction of TSS and some extent BOD/COD
  • Secondary Treatment: Biological treatment leading to reduction of BOD/COD
  • Tertiary Treatment: Filtration for improving upon the results of earlier stages & removal of color.

Further, another stage of Advanced Treatment can be added as per the laws governing the industry in the area or as per availability of freshwater or ease of disposal of treated water. This stage has not been covered in this introductory document.

Typical Waste Water Treatment Flowsheet

 

 

1. Bar Screen 2. Oil & Grease Traps 3. Bqualization Sump 4. Dosing Tanks
5. Flocculator 6. Primary Tube Settler 7. MBBR 8. EA Reactor
9. Secondary Tube Settler 10. Prefiltration Tank 11. Pressure Sand Filter Vessel 12. Activated Carbon Filter Vessel
13. Sludge Tank 14. Air Blower 15. Raw Effluent Lift Pump 16. Dosing Pump
17. Sludge Recirculation 18. Filtration Pump 19. Filter Press Feed Pump 20. Filter Press

Characteristics of Untreated Discharged Water

 

Type Cotton Waste Water Acrylic & Polyester Waste Water
Parameters Parameters Concentration
Temperature Ambient Ambient
pH 7.0-8.0 6.0-6.5
TSS 200-300 mgl 200-300 mgl
TDS 1500-1800 mgl 800-1000 mgl
BOD 300-400 mgl 150-200 mgl
COD 800-1000 mgl 400-500 mgl

Characteristics After Treatment of Water

 

Temperature Ambient
pH 5.5-9.0
TSS <100 mgl
TDS <2100 mgl
BOD 30 mgl
COD <250 mgl

 

Typical Water Consumption in Dyeing

 

Type Consumption
Acrylic Yarn Dyeing 80 L/KG
Polyester Fabrics 35 L/KG
Cotton Fabrics 120 L/KG

 

Different Stages of Treatment: Primary Treatment

 

Primary Treatment involves Physico-chemical treatment of influent to reduce TSS and colour from wastewater. COD of water is also reduced to some extent in this stage.

Different Stages of Treatment: Secondary Treatment

 

Secondary Treatment involves biological treatment of water from the first stage. This leads to a reduction of BOD & COD to desired levels.

Different Stages of Treatment: Tertiary Treatment

 

Tertiary Treatment is basically Filtration consisting of a Pressure Sand Filter & Activated Carbon Filter. They improve upon the parameters achieved in previous stages of treatment.

Typical Layout of a Biological Treatment Based Effluent Treatment Plant

 

1. Bar Screen 2. Oil & Grease Traps 3. Bqualization Sump 4. Dosing Tanks
5. Flocculator 6. Primary Tube Settler 7. MBBR 8. EA Reactor
9. Secondary Tube Settler 10. Prefiltration Tank 11. Pressure Sand Filter Vessel 12. Activated Carbon Filter Vessel
13. Sludge Tank 14. Air Blower 15. Raw Effluent Lift Pump 16. Dosing Pump
17. Sludge Recirculation 18. Filtration Pump 19. Filter Press Feed Pump 20. Filter Press
To know more, please check Eros Envirotech.
Leave A Reply

Your email address will not be published.