Chemical Oxygen Demand Reduction from Coffee Processing Waste Water a Comparative Study on Usage of Biosorbents Prepared from Agricultural Wastes

Authors: Ramya P.M., Jayasravanthi M., Dulla B.J., Venkata N.R.

The utilization of t hree novel and distinct agricultural waste materials, namely c asuarina fruit powder CFP s orghum stem powder SSP ) and b anan a stem powder ( as low cost adsorbents for reducing chemical oxygen demand ( COD levels of coffee industry waste water has been examined. Prepared adsorbents were characteriz ed by scanning electron microscopy ( SEM), Energy dispersive x ray spectros copic ( and Fourier Transform Infrared Spectroscopy The effects of parameters like adsorbent dose, pH, temperature agitation rate and time of adsorption on the reduction of COD levels were analyzed for each adsorbent individually and the efficiency order is CFP>SSP>BSP. Based on the extent of compatibility to Freundlich/ Langmuir adsorption isotherm and different models ( pseudo first order and second order , Boyd, Weber’s and Elovich), simultaneous occurrence of chemis orption and physi sorption was proposed. Based on the observations, it is proposed that three kinetic stages involve in adsorption process viz., diffusion of sorbate to sor bent, intra particle d iffusion and then establishment of equilibrium. As these three adsorbents exhibit adsorption capacity more than 80%, the adsorbents prepared from agricultural wastes have promising role towards reduction of COD from industrial waste water to contribute envi ronmental protection .

Comments: 10 Pages. OK

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[v1] 2019-05-19 05:16:03

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