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Membrane Water Treatment
  Volume 2, Number 4, October 2011 , pages 225-237

Empirical modelling of chemically enhanced backwash during ultrafiltration process
M.O. Daramola and A.G. Adeogun

    In this study, response of reversibility of membrane flux during chemically enhanced backwash (CEB) to changes in filtration time, filtration flux and coagulant concentration dosing during ultrafiltration (UF) process was investigated using a regression model. The model was developed via empirical modelling approach using response surface methodology. In developing the model, statistically designed UF experiments were conducted and the results compared with the model output. The results showed that the performance of CEB, evaluated in terms of the reversibility of the membrane flux, depends strongly on the changes in coagulant concentration dosage and the filtration flux. Also the response of the reversibility of membrane flux during CEB is independent of the filtration time. The variance ratio, VR << Fvalue and R2 = 0.98 obtained from the cross-validation experiments indicate perfect agreement of the model output with experimental results and also testify to the validity and suitability of the model to predict reversibility of the membrane flux during CEB in UF operation.
Key Words
    ultrafiltration; empirical model; response surface methodology; backwash
M.O. Daramola : Department of Chemical Engineering, Obafemi Awolowo University, Ile-Ife, Nigeria
A.G. Adeogun : National Centre for Hydropower Research and Development, PMB 1515, University of Ilorin, Ilorin, Nigeria

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