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  • 1 Centre for Nanotechnology, College of Agricultural Engineering, University of Agricultural Sciences, Raichur, Karnataka, India
  • | 2 Department of Processing and Food Engineering, College of Agricultural Engineering, University of Agricultural Sciences, Raichur, Karnataka, India
  • | 3 College of Agriculture, Mandya, University of Agricultural Sciences, Bangalore, Karnataka, India
  • | 4 Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Sciences, Raichur, Karnataka, India
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Abstract

The present study emphasised the efficiency of chitosan anchored titanium dioxide nano-adsorbent on dairy industry effluent treatment. Chitosan titanium dioxide nano-adsorbent was synthesised by using chemical precipitation method and characterised for its particle size, surface morphology and texture. A four-factor-three-level Box–Behnken design along with response surface methodology was used to optimise the adsorption process parameters. Linear, two factor interaction, quadratic and cubic model techniques were used to demonstrate the influence of each parameter and their interaction effects on the responses. The quadratic models derived from the experimental data were used to predict the maximum per cent reduction of biological oxygen demand (BOD) and chemical oxygen demand (COD). The optimised treatment combination for maximum per cent reduction in BOD (90.48%) and COD (82.10%) was found to be initial concentration of 100 mg L−1, pH of 7, dosage of 1.25 mg L−1 and contact time of 100 min.

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