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Treatment of silk textile wastewater by chemical coagulation, fenton oxidation and their combination.
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of silk textile wastewater
- 1. Treatment of silk textile wastewater by chemical coagulation, fenton oxidation and their combination. Khanittha Charoenlarp,Tipanan Phangthong, Sunanta Punteaum, and Mayuree Aomsomboon Department of Textile Chemistry Engineering, Rajamangala University of
- 2. Objective • To Investigate the efficiency of silk textile wastewater treatment.
- 3. Content • Introduction • Methods • Results • Conclusions
- 4. Introduction Textile is one of the important sectors in Thailand. Silk is known as “Queen of Textiles”.
- 5. Introduction
- 6. Silk product community in Surin Silk worms Silk cocoons Boiling the silk cocoons Reeling Bleaching and dyeing Weaving
- 7. Environmental concerns • The wastewater from bleaching and dyeing process was not properly treated and discharged into the environment.
- 8. The main problem of dyeing wastewater treatment • How to remove the contamination of dyes in wastewater which is mainly complex structure compound and toxic.
- 9. Wastewater treatment in dyeing industry • Biological processes • Physico-Chemical processes
- 10. Coagulation flocculation • Chemical coagulants cause formation of a sludge phase that can be separated by density difference. • Major coagulants: – Al2(SO4)3.14H2O (Alum) – FeCl3.6H2O – Fe2SO4
- 11. Fenton oxidation method • Discovered by Henry John Horstman Fenton in the1890. • Applied for the decolorization of effluents from the textile dyeing process. (Kim,T.H.,et al.,2004)
- 12. Fenton oxidation method • Fenton's Reagent : Hydrogen Peroxide combined with an Iron catalyst. • Creates multiple highly reactive powerful oxidizers: – Hydroxyl radical: OH0 – Peroxide free radical: HO20 H.J.H. Fenton.J. Chem. Soc. 1894, 65, 889.
- 13. Method • Analysis of silk textile wastewater. • Study the optimum condition and the treatment efficiency of – Chemical coagulation – Fenton oxidation – A combination between Chemical coagulation and Fenton oxidation method
- 14. Analysis of silk textile wastewater • The silk textile wastewater from Surin province, Thailand was used in this study. • The properties of wastewater to be analyzed were pH, COD, BOD, SS, and TS.
- 15. Measurements conductrometer pH turbidimeter
- 16. Measurements Total solid and suspended solid
- 17. Results Properties of silk dyeing wastewater Parameter Mean SD Standard measureement Value value pH (25oC) 4.16 0.2 5.5 - 9 COD (mg/L) 1669.24 76.50 <120 BOD (mg/L) 386.60 23.55 <20 SS (mg/L) 541.60 34.16 <50 TS (mg/L) 8289.60 261.87 <3000
- 18. Chemical coagulation experiment • The influence parameters for the chemical coagulation – Type and amount of coagulants – Type and amount of coagulant aids – Initial pH
- 19. Chemical coagulation parameter Condition Value Coagulants 0.4, 0.6, 0.8, 1.2, 1.6, 2.0, (Al2SO4 and Fe2SO4) and 2.4 g/L coagulant aids 0.2, 0.4, 0.6, and 0.8 g/L (Ca(OH)2 and cationic polymer) pH 5, 6, 7, 8, and 9 Rapid stirring rate (rpm) 100 Slow stirring rate (rpm) 20
- 20. The effect of pH value and types of coagulants 90.6% Color removal efficiency (%) 67.7% 1.2 g/L Al2SO4 1.2 g/L Fe2SO4 Initial pH
- 21. The effect of chemical coagulant dosages Color removal 97.1% COD removal Efficiency (%) 61.6% - Al2SO4 dosages (g/L)
- 22. The effect of chemical coagulant aids types and dosages 97.1% 98.9% 98.8% Efficiency (%) Color removal COD removal 70.8% 65.9% 61.6% 2.4 g/L Al2SO4 2.4 g/L Al2SO4 + 2.4 g/L Al2SO4 + 0.4 g/L Lime 0.4 g/L Polymer
- 23. The influence parameters of the Fenton oxidation • Initial pH • Fe2SO4 dosages • H2O2 dosages
- 24. Fenton oxidation parameter Condition Value H 2O 2 1.2, 2.4, 3.6, 4.8, and 6.0 g/L FeSO4 0.2, 0.4, 0.6, 0.8, and 1.0 g/L pH 2,3, 4 and 5
- 25. The effect of initial pH Efficiency (%) Color removal COD removal initial pH
- 26. The effect of the ferrous dosages 91.5% Efficiency (%) 66.5% Color removal COD removal Ferrous dosages (g/L)
- 27. The effect of the H2O2 dosages 90.8% 91.3% Efficiency (%) 66.9% 67.5% Color removal COD removal H2O2 dosages + 0.8 g/L Fe2SO4
- 28. The efficiency of silk dyeing wastewater treatment by combination chemical coagulation and Fenton oxidation Chemical Fenton oxidation Coagulation + coagulation Fenton Color removal (%) COD removal (%)
- 29. Conclusions • The chemical coagulation and Fenton oxidation method was limited when wastewater contains high concentration of SS and COD. • The combination of chemical coagulation and Fenton oxidation were more efficient than one.
- 30. Recommendations • To compare the cost of each method. • To compare the sludge of each method. • To reduce pollution from the source.
- 31. Acknowledgement • Rajamangala University of Technology Krungthep for financial support.
- 32. Thank you all for your attention
- 33. Silk product community in Surin Silk worms Silk cocoons Boiling the silk cocoons Reeling Bleaching and dyeing Weaving
Editor's Notes
- .
- The figures show the instruments used for measurements ; pH, conductivity and turbidity.
- Thai silk is produced from the cocoons of Thai silkworms. The processes begins by raising silkworms on mulberry leaves. When they are mature, the silkworms spin silk cocoons. The cocoons is treated with boiling water. The silk is then unbound from the cocoon by softening the sericin and then carefully reeling the filaments. The yarns with the original cream colour are bleached in a mixture of hot water and chemical substances to become white. The yarns are dyed and then woven to create different types of Thai silk fabrics.