Residual cod reduction in biologically treated leather tanning effluents by advanced treatment processes

Olcay Tünay; Z. Berker Yelmez; Tugba Ölmez; Isik Kabdasli

Residual cod reduction in biologically treated leather tanning effluents by advanced treatment processes

Olcay Tünay^*, Z. Berker Yelmez, Tugba Ölmez, Isik Kabdasli

^*Corresponding author for this work

Department of Environmental Engineering

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Biological treatment of effluents from industrial wastewaters often requires further treatment to comply with discharge standards. In this paper, an advanced oxidation processes and activated carbon adsorption were applied. Direct ozone reaction provided 70 % COD reduction. A readily oxidizable part of the substrate was defined. Catalytic ozone oxidation using ferric chloride proved to be very effective. Oxidation by ozone at pH 13 was fast and resulted in complete mineralization. The efficiency of O ₃/H ₂O ₂ system was dependent on O ₃/H ₂O ₂ ratio and at 1 mol/l mol ratio a better COD reduction than that of ozone alone was obtained. A kinetic equation was derived for the slower part of O ₃/H ₂O ₂ (1 mol/ 1 mol) oxidation. Adsorption experiments were conducted using powdered and granular carbon. The time to attain the equilibrium was found to be long and COD removal efficiencies were below 25%. Use of powdered activated carbon in combination with an activated sludge process was recommended.

Original language	English
Pages (from-to)	123-131
Number of pages	9
Journal	Journal of the American Leather Chemists Association
Volume	101
Issue number	4
Publication status	Published - Apr 2006

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Cite this

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title = "Residual cod reduction in biologically treated leather tanning effluents by advanced treatment processes",

abstract = "Biological treatment of effluents from industrial wastewaters often requires further treatment to comply with discharge standards. In this paper, an advanced oxidation processes and activated carbon adsorption were applied. Direct ozone reaction provided 70 % COD reduction. A readily oxidizable part of the substrate was defined. Catalytic ozone oxidation using ferric chloride proved to be very effective. Oxidation by ozone at pH 13 was fast and resulted in complete mineralization. The efficiency of O 3/H 2O 2 system was dependent on O 3/H 2O 2 ratio and at 1 mol/l mol ratio a better COD reduction than that of ozone alone was obtained. A kinetic equation was derived for the slower part of O 3/H 2O 2 (1 mol/ 1 mol) oxidation. Adsorption experiments were conducted using powdered and granular carbon. The time to attain the equilibrium was found to be long and COD removal efficiencies were below 25%. Use of powdered activated carbon in combination with an activated sludge process was recommended.",

author = "Olcay T{\"u}nay and {Berker Yelmez}, Z. and Tugba {\"O}lmez and Isik Kabdasli",

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T1 - Residual cod reduction in biologically treated leather tanning effluents by advanced treatment processes

AU - Tünay, Olcay

AU - Berker Yelmez, Z.

AU - Ölmez, Tugba

AU - Kabdasli, Isik

PY - 2006/4

Y1 - 2006/4

N2 - Biological treatment of effluents from industrial wastewaters often requires further treatment to comply with discharge standards. In this paper, an advanced oxidation processes and activated carbon adsorption were applied. Direct ozone reaction provided 70 % COD reduction. A readily oxidizable part of the substrate was defined. Catalytic ozone oxidation using ferric chloride proved to be very effective. Oxidation by ozone at pH 13 was fast and resulted in complete mineralization. The efficiency of O 3/H 2O 2 system was dependent on O 3/H 2O 2 ratio and at 1 mol/l mol ratio a better COD reduction than that of ozone alone was obtained. A kinetic equation was derived for the slower part of O 3/H 2O 2 (1 mol/ 1 mol) oxidation. Adsorption experiments were conducted using powdered and granular carbon. The time to attain the equilibrium was found to be long and COD removal efficiencies were below 25%. Use of powdered activated carbon in combination with an activated sludge process was recommended.

AB - Biological treatment of effluents from industrial wastewaters often requires further treatment to comply with discharge standards. In this paper, an advanced oxidation processes and activated carbon adsorption were applied. Direct ozone reaction provided 70 % COD reduction. A readily oxidizable part of the substrate was defined. Catalytic ozone oxidation using ferric chloride proved to be very effective. Oxidation by ozone at pH 13 was fast and resulted in complete mineralization. The efficiency of O 3/H 2O 2 system was dependent on O 3/H 2O 2 ratio and at 1 mol/l mol ratio a better COD reduction than that of ozone alone was obtained. A kinetic equation was derived for the slower part of O 3/H 2O 2 (1 mol/ 1 mol) oxidation. Adsorption experiments were conducted using powdered and granular carbon. The time to attain the equilibrium was found to be long and COD removal efficiencies were below 25%. Use of powdered activated carbon in combination with an activated sludge process was recommended.

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M3 - Article

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JF - Journal of the American Leather Chemists Association

IS - 4

ER -

Residual cod reduction in biologically treated leather tanning effluents by advanced treatment processes

Abstract

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