____________________________________________________________________________________________ *Corresponding author: E-mail: solarfunmi@yahoo.com.hk; Journal of Scientific Research & Reports 2(1): 376-390, 2013; Article no. JSRR.2013.026 SCIENCEDOMAIN international www.sciencedomain.org Modelling of Mass Transfer Rate During Biocoagulation-Flocculation of Coal-Rich Wastewater L. A. Jimoda 1 , E. O. Oke 1* and K. K. Salam 1 1 Department of Chemical Engineering, Ladoke Akintola University of Technology, Ogbomoso, Oyo State, Nigeria. Authors’ contributions This work was carried out in collaboration between all authors. Author LAJ collected all the information needed for review from articles related to this research work; he also stated the research problem. Author EOO formulated the model and solution with necessary assumptions. Author KKS analyzed and interpreted the simulation result. All authors proof- read and approved the final manuscript. Received 28 th February 2013 Accepted 26 th April 2013 Published 16 th June 2013 ABSTRACT The study was aimed at modeling rate of mass (diffusing particles) transfer during bio- coagulation/flocculation of coal-rich wastewater at different operating conditions. Diffusion equation was developed from law of conservation of mass and partial differential equations were used to describe rate of mass transfer during the process. The equations were firstly solved by method of separation of variables which resulted to initial-boundary value problem. Then, integral properties were used to calculate Fourier coefficient of the series. Codes were later developed in MATLAB enviroment for computer simulation. The predicted results were compared with experimental data obtained from the literature and it was found in good agreement. The predicted results could be further used for the design, control and optimization of bio-coagulation process. Keywords: Coagulation; flocculation; analytical modeling; wastewater; computer simulation. Research Article