1. Inventory and Tertiary Treatment of Effluent from Textile Industries in Bangladesh The use of a new system combining an enhanced coagulation, flocculation and filtration
M.A.H. Badsha
Supervisor:
Prof. J.B. van Lier
Mentor(s):
C.M. Hooijmans
H.A. Garcia Hernandez
Delft, April 14, 2015

2. Introduction High TDS Chemical dyes
Effluent from textile industries is a great concern in Bangladesh, because
High TDS
Chemical dyes
Major impacts:
Causing health consequences
Damaging agricultural lands
Killing aquatic lives
Source:

3. Problem Statement Efficient technology to remove color is expensive
Limited space for up-gradation
Unplanned expansion of textile industry in rural areas
As a result, integration of a compact, low cost and efficient technology to remove colour from textile effluent is desired.

4. Existing ETP of Masco Industries Ltd
Inlet
Collection Tank
Aeration Tank
Secondary Clarifier
EC Skid
DAF unit

5. Compact Treatment System
Figure: Schematic of the polishing unit using AFM grains (Dryden Aqua, 2014)
APF- All Poly Floc (mixer of poly aluminum chloride and poly electrolytes)
ZPM- Zeta Potential Mixer (static mixer)

6. Research Questions
What technologies are available and in operation to treat textile waste-waters in Bangladesh?
What is the colour removal performance of a treatment system using AFM and APF with effluent from an existing wastewater treatment plant at a textile industry?

7. Research Objectives The specific objectives of the proposed study are:
Make an overview of the available technologies
Study the adsorption capacity of colour by AFM
Study the effect of different flow rates on the performance of the AFM filter media
Compare the performance of APF and a conventional coagulant
Study the performance of the local sand against AFM
Run a pilot AFM system at Masco Industries Ltd

8. Research Methodology Inventory Study
Observe the removal rate of colour by adsorption, coagulation-flocculation and filtration
Sample collection and characterization
Results and Discussion
Conclusions
Batch studies
Inventory Study
Column studies
Pilot study at Masco Ind. Ltd

9. Inventory Study Poor treatment facility
(a) No overflow in the primary clarifier (b) Paddy field surrounded by ETP (c) No overflow in secondary clarifier (d) No flow meter

10. Inventory Study Sludge Management
(a) Filter press out of operation (b) Limited space for SDB (c) Dry sludge on SDB (d) Sludge ready to dispose

11. Optimum Coagulant Dosage
Batch Studies
Wastewater Sample
AFM grade-1
Adsorption Test
Optimum Coagulant Dosage

12. Batch Adsorption Test Result

13. Optimum Dosing of Coagulant “APF”

14. Column Studies Schematic of the Column Set-up

15. Column Set-up at the Lab

16. Initial Flow Rate = 315 ml/min
Results of Column Studies (only feed water without coagulation-flocculation)
Initial Color = 282 Pt.Co.
Initial Flow Rate = 315 ml/min

17. Effect of Different Flow Rates (fed with supernatant after coagulation-flocculation with APF)
Initial Color = 482 Pt.Co., Supernatant = 184 Pt.Co.
F1 = 120ml/min, F2 = 220ml/min and F3 = 350ml/min

18. Performance of the Column (fed with supernatant after coagulation-flocculation with APF and Aluminium)
Initial Color = 572 Pt.Co., Supernatant (using Aluminium)= 382 Pt.Co.,
Supernatant (using APF) = 207 Pt.Co. and Flow Rate = 315ml/min

19. Performance of Sand and AFM (fed with supernatant after coagulation-flocculation with APF)
Initial Color = 479 Pt.Co., Supernatant = 119 Pt.Co. and Flow Rate = 315ml/min

20. Backwash Efficiency with Fresh Water (fed with supernatant after coagulation-flocculation with APF)
Initial Color = 257 Pt.Co., Supernatant = 64 Pt.Co. and Flow Rate = 315ml/min

21. Pilot Study at Masco Ind. Ltd
Filter Tank
APF Dosing Pump
Storage Tank
Backwash pump

22. Result of the Pilot Study
(In-situ coagulation-flocculation and filtration)
Discharge Standard
Initial Color = 549 Pt.Co. and Flow Rate = 1m3/h

23. Backwash Efficiency
Flow Rate = 12m3/h

24. Proposed Treatment Scheme
AFM System

25. Conclusions
Regarding the overview on the existing treatment technology:
Illegal discharge of wastewater
poorly managed and often non-operational
coloured effluent is being discharged without any tertiary treatment
Sludge management is important and needs immediate attention
Regarding activated filter media (AFM) and APF dosing:
The AFM media has no significant adsorption capacity (with and without APF dosing)
APF is a good coagulant compared to aluminium
Performance of local sand is better than AFM filter media
Coagulation and flocculation followed by a clarifier could be good enough
Regarding AFM system
Not suitable as a tertiary treatment system to remove color at a textile industry

26. THANK YOU FOR YOUR ATTENTION