International Research Journal of Engineering Science, Technology and Innovation

International Research Journal of Engineering Science, Technology and Innovation (IRJESTI) ISSN (2315-5663) Vol. 3(3), pp. 31-34, September 2014. DOI: http:/      
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Full Length Research Paper

Kinetic studies of BOD5, COD and Chromium removal in tannery effluent using ZnO-ZnFe2O4 composite photocatalyst supported on activated carbon

Haji Mohammed A1,2*, Hamza A2, Waziri SM 2, Adamu IK1, Ejila. A1

1Nigeria Institute of Leather and Science Technology, Zaria, Nigeria 2Department of Chemical Engineering, Ahmadu  Bello University Zaria, Nigeria

*Corresponding authors e-mail:



The kinetics studies of the adsorption and degradation phenomena involving tanning wastewater containing high BOD5, COD and chromium were investigated using a batch reactor and UV light irradiation under ambient conditions of temperature and pressure. Experiments were performed in a suspended   ZnO-ZnFe2O4/20g AC system at natural pH of 6.93 and catalyst concentration of 0.1 mg/100ml. The initial concentration of tannery wastewater was varied between 0.1mg/10ml- 0.1mg/100ml. The kinetic analysis of the photodecomposition of tannery wastewater showed that the disappearance followed satisfactorily the pseudo first-order according to Langmuir— Hinshelwood model. The plots obtain from this model were then used to determine the values of ro, 1/Co and 1/ro. The photocatalytic removal of BOD5, COD and Cr nicely fitted the Langmuir – Hinshelwood kinetic model (R2 = 0.9364 for BOD5, 0.9673 for COD, and 1 for Cr). The adsorption of the three parameters was found to be the rate controlling step of the photocatalytic processes.

Keywords: Photocatalyst, COD, BOD5, Chromium, ZnO-ZnFe2O4, Tannery wastewater

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