Treatment of sulfidic spent caustic by integrated system of Fenton oxidation and activated carbon absorption

Spent caustic is a wastewater that generated from the refinery activities. Due to the hazardous and toxic nature of this waste, it must be treated well before being discharged to the water bodies. The purpose of this study was to investigate the treatability of Fenton oxidation as pretreatment and a...

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Main Author:	Md. Noor, Siti Fadilla
Format:	Thesis
Published:	2013
Subjects:	TD Environmental technology Sanitary engineering
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spelling	my-utm-ep.422332020-08-19T07:44:46Z Treatment of sulfidic spent caustic by integrated system of Fenton oxidation and activated carbon absorption 2013 Md. Noor, Siti Fadilla TD Environmental technology. Sanitary engineering Spent caustic is a wastewater that generated from the refinery activities. Due to the hazardous and toxic nature of this waste, it must be treated well before being discharged to the water bodies. The purpose of this study was to investigate the treatability of Fenton oxidation as pretreatment and activated carbon (AC) adsorption as the post treatment of spent caustic. In this research, synthetic spent caustic and industrial spent caustic were employed. The pH adjustment step was meant to prepare an acidic condition for the subsequent Fenton oxidation. Whereas, the optimum conditions for this Fenton oxidation was determined by the aid of response surface methodology (RSM). Besides, the AC adsorption acted as the post treatment of synthetic spent caustic. The equilibrium isotherm study was done in order to determine the best correlation of the isotherm model for this adsorption process. Finally, the performance of the integrated system of Fenton oxidation-AC adsorption to treat industrial spent caustic was determined by analyzing the chemical oxygen demand (COD), sulfide, iron and sulfate concentrations after each treatment step. The pH adjustment step caused the COD and sulfide to remove by 24% and 68%, respectively. By using RSM, the optimal conditions for Fenton oxidation were found to be at H2O2/COD = 0.09, Fe/H2O2 = 1.44 and reaction time = 24 minutes. The best process conditions of AC adsorption were found to be at adsorbent dosage = 10 g/l, pH = 7, temperature = 30oC and contact time = 60 minutes. The equilibrium isotherm study showed that the AC adsorption fitted well with the Freundlich model. After the integrated system, the COD was reduced from 10920 mg/L to 283 mg/L. The final concentration of sulfide, iron and sulfate of the industrial spent caustic were 0.72, 8.4 and 454 mg/L, respectively. In conclusion, the integrated system has potential to effectively treat synthetic as well as industrial spent caustic. 2013 Thesis http://eprints.utm.my/id/eprint/42233/ http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:78888 masters Universiti Teknologi Malaysia, Faculty of Chemical Engineering Faculty of Chemical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
topic	TD Environmental technology Sanitary engineering
spellingShingle	TD Environmental technology Sanitary engineering Md. Noor, Siti Fadilla Treatment of sulfidic spent caustic by integrated system of Fenton oxidation and activated carbon absorption
description	Spent caustic is a wastewater that generated from the refinery activities. Due to the hazardous and toxic nature of this waste, it must be treated well before being discharged to the water bodies. The purpose of this study was to investigate the treatability of Fenton oxidation as pretreatment and activated carbon (AC) adsorption as the post treatment of spent caustic. In this research, synthetic spent caustic and industrial spent caustic were employed. The pH adjustment step was meant to prepare an acidic condition for the subsequent Fenton oxidation. Whereas, the optimum conditions for this Fenton oxidation was determined by the aid of response surface methodology (RSM). Besides, the AC adsorption acted as the post treatment of synthetic spent caustic. The equilibrium isotherm study was done in order to determine the best correlation of the isotherm model for this adsorption process. Finally, the performance of the integrated system of Fenton oxidation-AC adsorption to treat industrial spent caustic was determined by analyzing the chemical oxygen demand (COD), sulfide, iron and sulfate concentrations after each treatment step. The pH adjustment step caused the COD and sulfide to remove by 24% and 68%, respectively. By using RSM, the optimal conditions for Fenton oxidation were found to be at H2O2/COD = 0.09, Fe/H2O2 = 1.44 and reaction time = 24 minutes. The best process conditions of AC adsorption were found to be at adsorbent dosage = 10 g/l, pH = 7, temperature = 30oC and contact time = 60 minutes. The equilibrium isotherm study showed that the AC adsorption fitted well with the Freundlich model. After the integrated system, the COD was reduced from 10920 mg/L to 283 mg/L. The final concentration of sulfide, iron and sulfate of the industrial spent caustic were 0.72, 8.4 and 454 mg/L, respectively. In conclusion, the integrated system has potential to effectively treat synthetic as well as industrial spent caustic.
format	Thesis
qualification_level	Master's degree
author	Md. Noor, Siti Fadilla
author_facet	Md. Noor, Siti Fadilla
author_sort	Md. Noor, Siti Fadilla
title	Treatment of sulfidic spent caustic by integrated system of Fenton oxidation and activated carbon absorption
title_short	Treatment of sulfidic spent caustic by integrated system of Fenton oxidation and activated carbon absorption
title_full	Treatment of sulfidic spent caustic by integrated system of Fenton oxidation and activated carbon absorption
title_fullStr	Treatment of sulfidic spent caustic by integrated system of Fenton oxidation and activated carbon absorption
title_full_unstemmed	Treatment of sulfidic spent caustic by integrated system of Fenton oxidation and activated carbon absorption
title_sort	treatment of sulfidic spent caustic by integrated system of fenton oxidation and activated carbon absorption
granting_institution	Universiti Teknologi Malaysia, Faculty of Chemical Engineering
granting_department	Faculty of Chemical Engineering
publishDate	2013
_version_	1747816722270781440

Treatment of sulfidic spent caustic by integrated system of Fenton oxidation and activated carbon absorption

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