UV/H2O2/TiO2/zeolite hybrid system for treatment of molasses wastewater

Seth Apollo, Maurice S. Onyango, Aoyi Ochieng

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Wastewater from molasses processing contains a large amount of coloured substances that give a recalcitrant dark brown colour and high organic load to the effluent. Photocatalytic decolourization of molasses wastewater was performed using titanium dioxide catalyst coated on the surface of South African natural zeolite using the solid-solid dispersion method. Addition of hydrogen peroxide as an oxidant was investigated and 30W UV-Clamp was used as source of irradiation. The Chemical Oxygen Demand (COD) of the wastewater treated was varied from 20 g/L to 1 g/L. Batch experiments were conducted in a thermostatic shaker fitted with the UV lamp. The effects of pH, catalyst loading, oxidant dosage and irradiation time on the COD reduction and decolourization of the Molasses Waste Water (MWW) were investigated in this study. The highest colour removal of more than 90% was achieved at pH = 4 and oxidant dosage of 1.47 mM, while low COD removal (< 20%) was observed during photodegradation. A H2O2/UV/TiO2 system achieved higher colour removal of 97% compared to a UV/TiO2 system which achieved 44% while H2O2/UV system achieved 34% colour removal. The rate of decolourization was found to fitpseudo - first order reaction kinetics with the highest rate constant value of 1.36 x 10-2 min-1.
Original languageEnglish
Pages (from-to)107-117
Number of pages11
JournalIranian Journal of Chemistry and Chemical Engineering
Volume33
Issue number2
Publication statusPublished - 2014

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Molasses
Zeolites
Hybrid systems
Chemical oxygen demand
Wastewater
Oxidants
Irradiation
Ultraviolet lamps
Catalysts
Photodegradation
Clamping devices
Hydrogen peroxide
Reaction kinetics
Titanium dioxide
Hydrogen Peroxide
Effluents
Rate constants
Color
Processing
Experiments

Cite this

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title = "UV/H2O2/TiO2/zeolite hybrid system for treatment of molasses wastewater",
abstract = "Wastewater from molasses processing contains a large amount of coloured substances that give a recalcitrant dark brown colour and high organic load to the effluent. Photocatalytic decolourization of molasses wastewater was performed using titanium dioxide catalyst coated on the surface of South African natural zeolite using the solid-solid dispersion method. Addition of hydrogen peroxide as an oxidant was investigated and 30W UV-Clamp was used as source of irradiation. The Chemical Oxygen Demand (COD) of the wastewater treated was varied from 20 g/L to 1 g/L. Batch experiments were conducted in a thermostatic shaker fitted with the UV lamp. The effects of pH, catalyst loading, oxidant dosage and irradiation time on the COD reduction and decolourization of the Molasses Waste Water (MWW) were investigated in this study. The highest colour removal of more than 90{\%} was achieved at pH = 4 and oxidant dosage of 1.47 mM, while low COD removal (< 20{\%}) was observed during photodegradation. A H2O2/UV/TiO2 system achieved higher colour removal of 97{\%} compared to a UV/TiO2 system which achieved 44{\%} while H2O2/UV system achieved 34{\%} colour removal. The rate of decolourization was found to fitpseudo - first order reaction kinetics with the highest rate constant value of 1.36 x 10-2 min-1.",
author = "Seth Apollo and Onyango, {Maurice S.} and Aoyi Ochieng",
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}

UV/H2O2/TiO2/zeolite hybrid system for treatment of molasses wastewater. / Apollo, Seth; Onyango, Maurice S.; Ochieng, Aoyi.

In: Iranian Journal of Chemistry and Chemical Engineering, Vol. 33, No. 2, 2014, p. 107-117.

Research output: Contribution to journalArticle

TY - JOUR

T1 - UV/H2O2/TiO2/zeolite hybrid system for treatment of molasses wastewater

AU - Apollo, Seth

AU - Onyango, Maurice S.

AU - Ochieng, Aoyi

PY - 2014

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N2 - Wastewater from molasses processing contains a large amount of coloured substances that give a recalcitrant dark brown colour and high organic load to the effluent. Photocatalytic decolourization of molasses wastewater was performed using titanium dioxide catalyst coated on the surface of South African natural zeolite using the solid-solid dispersion method. Addition of hydrogen peroxide as an oxidant was investigated and 30W UV-Clamp was used as source of irradiation. The Chemical Oxygen Demand (COD) of the wastewater treated was varied from 20 g/L to 1 g/L. Batch experiments were conducted in a thermostatic shaker fitted with the UV lamp. The effects of pH, catalyst loading, oxidant dosage and irradiation time on the COD reduction and decolourization of the Molasses Waste Water (MWW) were investigated in this study. The highest colour removal of more than 90% was achieved at pH = 4 and oxidant dosage of 1.47 mM, while low COD removal (< 20%) was observed during photodegradation. A H2O2/UV/TiO2 system achieved higher colour removal of 97% compared to a UV/TiO2 system which achieved 44% while H2O2/UV system achieved 34% colour removal. The rate of decolourization was found to fitpseudo - first order reaction kinetics with the highest rate constant value of 1.36 x 10-2 min-1.

AB - Wastewater from molasses processing contains a large amount of coloured substances that give a recalcitrant dark brown colour and high organic load to the effluent. Photocatalytic decolourization of molasses wastewater was performed using titanium dioxide catalyst coated on the surface of South African natural zeolite using the solid-solid dispersion method. Addition of hydrogen peroxide as an oxidant was investigated and 30W UV-Clamp was used as source of irradiation. The Chemical Oxygen Demand (COD) of the wastewater treated was varied from 20 g/L to 1 g/L. Batch experiments were conducted in a thermostatic shaker fitted with the UV lamp. The effects of pH, catalyst loading, oxidant dosage and irradiation time on the COD reduction and decolourization of the Molasses Waste Water (MWW) were investigated in this study. The highest colour removal of more than 90% was achieved at pH = 4 and oxidant dosage of 1.47 mM, while low COD removal (< 20%) was observed during photodegradation. A H2O2/UV/TiO2 system achieved higher colour removal of 97% compared to a UV/TiO2 system which achieved 44% while H2O2/UV system achieved 34% colour removal. The rate of decolourization was found to fitpseudo - first order reaction kinetics with the highest rate constant value of 1.36 x 10-2 min-1.

M3 - Article

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JO - Iranian Journal of Chemistry and Chemical Engineering

JF - Iranian Journal of Chemistry and Chemical Engineering

SN - 1021-9986

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ER -