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The Study of Colour Removal of Textile Wastewater by Oxidation - Reduction Methods

Name: »ÇÕ³Ò ¸¹ÐÊѧ¢ì

Organization : ÁËÒÇÔ·ÂÒÅÑÂà·¤â¹âÅÂÕ¾ÃШÍÁà¡ÅéÒ¸¹ºØÃÕ

Name: Paveena Thanasanka

keyword: ¡ÒáӨѴÊÕ¨Ò¡¹éÓ·Ô駿͡ÂéÍÁÊÔ觷Í

; ¡ÃкÇáÒÃÍÍ¡«Ôപѹ-ÃÕ´Ñ¡ªÑ¹

Abstract: This research was done to study the colour removal from textile wastewater byoxidation and reduction methods. The oxidizing agents used in the study were Fenton’sreagent (The mixture of ferrous sulfate (FeSO4) as activator and hydrogen peroxide (H2O2) asoxidizing agent) and sodium hydrosulfite (Na2SO4) was used as reducing agent. Theexperiments were devided into 2 parts. First, the optimum conditions for oxidation andreduction i.e., pH; doses and reaction time were studied by Jar Test Method. Four kinds ofartiftcial dye solutions were used in the study, they were direct, reactive, acid and basic dyesolution with the initial concentration of 20 ppm. Second, the datas were obtained above,were applied for using to treat the real textile wastewater.According to the colour removal by Na2SO4 the optimum pH for direct and aciddye solutions were 4.0, for some basic dye solutions (Maxilon Red GRL 150% and MaxilonBlue GRL 300%) and some reactive dye solutions (Drim BR Red X-2BN) were in the rangeof 4.0 - 9.0 and for some basic dye solutions (Cationic Red X - SGR) were 9.0. Theoptimum Na2SO4 doses for colour removal from direct, reactive, acid and basic dye solutionwere in the range of 80 - 110, 68 - 100, 86 - 90 and 30 - 80 ppm, respectively, as well asthe corresponding efficiencies were in the range of 97.0 - 99.5%, 97.3 - 9X.4%, 84.2 - 96.0%and 91.4 - 99.2% respectively.From the experimental results by using Fenton’s reagent, the optimum pH for alldirect, some reactive dye solutions (Drim BR Red X-2BN)and some acid dye solutions(Lanaset Red 2B) were 4.0, for all basic, some reactive (Drim Blue X-3LR) and some aciddye (Lanaset Navy R) solutions were in the range of 4.0 - 9.0. For the initial dyeconcentration of 20 ppm,the optimum FeSO4 doses for colour removal of direct, reactive,acid and basic dye solutions were in the range of 20 - 40 ppm, 10 - 20 ppm, 30 - 60 ppmand 30 - 80 ppm respectively. The optimum doses for H2O2 were in the range of 1.8 - 9.6,8.4 - 28.8, 6.6 - 25.2 and 9.6 - 24.0 ppm respectively, the corresponding efficiencies forcolour removal were 90.7 - 9&O%, 96.1 - 97.9%, 87.0 - 97.2% and 89.1 - 9 9 .0%respectively.Finally, when the obtained above data were applied for the textile wastewater;effluent from the activated sludge process with the initial pH was in the range of 8.0 - 8.6and COD of 113 - 200 ppm, and the colour intensity in term of ADMI number was in therange of 572 - 863. The results from Na2SO4 reduction were as follows : optimum pH rangeof 4.0 - 5.0, the mixing was 20 minutes, settling time was 30 minutes. In addition, theoptimum Na2SO4 doses was 60 - 80 ppm with the colour removal efficiency in term ofADMI reduction was in the range of 65.6 - 79.8% and in term of COD removal was 42.4 -49.8%.The chemical cost for treatment was in the range of 8.55 - 10.66 baht per cubic meter(all chemicals used including the chemical for final pH adjustment to pH 7.0).For the Fenton’s reagent, it could be concluded that the optimum pH was 4.0,mixing time was 20 minutes and settling time was 20 minutes, and the optimum FeSO4 andH2O2 doses were in the range of 110.0 - 185.0 ppm and 18.8 - 36.0 ppm respectively. Theefftciency for colour removal in term of ADMI number was 82.5 - 94.4% and in term ofCOD removal was 36.8 - 61.1%. The estimated chemical costs ‘was in the range of 5.94 -9.55baht per cubic meter.So, in conclusions, the colour removal efficiency of Fenton’s reagent areappreciable but for the Na2SO4 though the colour removal efficiency for the artificial dyesolutions were high but for the textile wastewater the results were not appreciable.

ÁËÒÇÔ·ÂÒÅÑÂà·¤â¹âÅÂÕ¾ÃШÍÁà¡ÅéÒ¸¹ºØÃÕ

Address: ¡Ãا෾ÁËÒ¹¤Ã

Email: info.lib@mail.kmutt.ac.th

Name: ¹ÃҾà ËҭǨ¹Ç§Èì

Role: ÍÒ¨ÒÃÂì·Õè»ÃÖ¡ÉÒ

Name: ÊÃéÍ´ÒÇ ÇÔ¹Ô¨¹Ñ¹·Ãѵ¹ì

Role: ÍÒ¨ÒÃÂì·Õè»ÃÖ¡ÉÒ

Created: 2539

Issued: 2005-04-13

Modified: 2554-05-14

ÇÔ·ÂÒ¹Ô¾¹¸ì/Thesis

ISBN: 9746217755

CallNumber: EV78

tha

DegreeName: ÇÔ·ÂÒÈÒʵÃÁËҺѳ±Ôµ

Level: »ÃÔ­­Òâ·

Descipline: à·¤â¹âÅÂÕÊÔè§áÇ´ÅéÍÁ

Grantor: ÁËÒÇÔ·ÂÒÅÑÂà·¤â¹âÅÂÕ¾ÃШÍÁà¡ÅéÒ¸¹ºØÃÕ

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