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.
of silk textile wastewater
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
Objective• To Investigate the efficiency of silk textile wastewater treatment.
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
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.
Results Properties of silk dyeing wastewater Parameter Mean SD Standard measureement Value valuepH (25oC) 4.16 0.2 5.5 - 9COD (mg/L) 1669.24 76.50 <120BOD (mg/L) 386.60 23.55 <20SS (mg/L) 541.60 34.16 <50TS (mg/L) 8289.60 261.87 <3000
Chemical coagulation experiment• The influence parameters for the chemical coagulation – Type and amount of coagulants – Type and amount of coagulant aids – Initial pH
Chemical coagulation parameter Condition ValueCoagulants 0.4, 0.6, 0.8, 1.2, 1.6, 2.0,(Al2SO4 and Fe2SO4) and 2.4 g/Lcoagulant aids 0.2, 0.4, 0.6, and 0.8 g/L(Ca(OH)2 and cationicpolymer)pH 5, 6, 7, 8, and 9Rapid stirring rate (rpm) 100Slow stirring rate (rpm) 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
The effect of chemical coagulant dosages Color removal 97.1% COD removalEfficiency (%) 61.6% - Al2SO4 dosages (g/L)
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
The influence parameters of the Fenton oxidation• Initial pH• Fe2SO4 dosages• H2O2 dosages
Fenton oxidation parameter Condition ValueH 2O 2 1.2, 2.4, 3.6, 4.8, and 6.0 g/LFeSO4 0.2, 0.4, 0.6, 0.8, and 1.0 g/LpH 2,3, 4 and 5
The effect of initial pHEfficiency (%) Color removal COD removal initial pH
The effect of the ferrous dosages 91.5%Efficiency (%) 66.5% Color removal COD removal Ferrous dosages (g/L)
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
The efficiency of silk dyeing wastewater treatment by combination chemical coagulation and Fenton oxidation Chemical Fenton oxidation Coagulation + coagulation Fenton Color removal (%) COD removal (%)
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.
Recommendations• To compare the cost of each method.• To compare the sludge of each method.• To reduce pollution from the source.
Acknowledgement• Rajamangala University of Technology Krungthep for financial support.