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Treatment of Industrial Wastewater

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Recent Trends in Modelling of Environmental Contaminants

Abstract

Textile wastewater is one among the most complex industrial wastewaters. Photocatalytic degradation process has been effectively used to degrade real and synthetic wastewater. Response surface modelling has been used to optimize many physical and chemical processes. This chapter presents a case study on the application of response surface modelling to optimize the photocatalytic degradation of real textile wastewater from a fabric dyeing and finishing industry using 1 % Ag+ doped TiO2 in a batch reactor which was irradiated by UV rays of wavelength 254 nm. Response surface modelling (RSM) was used to evaluate the individual and interaction effects of catalyst dose, initial concentration of textile wastewater and reaction pH, on two responses: colour removal and chemical oxygen demand (COD) removal. These variables were found to impart maximum effect on the degradation process. Box–Behnken design of experiment was used to design 15 sets of experiments, to be used in RSM optimization, with the help of Design Expert software version 8.0.6.1. After the optimization under three imposed constraints, the values for the process variables giving optimum results were: catalyst dose, 1.5 g/L, real textile wastewater concentration, 60 % and reaction pH, 7. The results of the validation experiment under the optimized conditions were colour removal and COD removal of 90.46 % and 71.72 %, respectively after UV irradiation for 180 min. The resulting polynomial equations for real textile wastewater were also compared with the equations developed for synthetic wastewater. The regression analysis showed that the developed model is adequate to predict the individual and interaction effects of the process variables.

C. Sahoo is currently a research scholar at the Department of Civil Engineering, IIT Kharagpur.

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Authors and Affiliations

  1. Environmental Engineering Division, Department of Civil Engineering, Indian Institute of Technology, 721302, Kharagpur, India

    Prof. A. K. Gupta

  2. Department of Civil Engineering, Indira Gandhi Institute of Technology, 759146, Sarang, Odisha, India

    Asst. Prof. C. Sahoo

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  1. Prof. A. K. Gupta
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  2. Asst. Prof. C. Sahoo
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Correspondence to A. K. Gupta .

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Editors and Affiliations

  1. Geology and Geophysics, Indian Institute of Technology, Kharagpur, West Bengal, India

    Debashish Sengupta

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Gupta, A., Sahoo, C. (2014). Treatment of Industrial Wastewater. In: Sengupta, D. (eds) Recent Trends in Modelling of Environmental Contaminants. Springer, New Delhi. https://doi.org/10.1007/978-81-322-1783-1_6

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