IJEP 41(9): 972-978 : Vol. 41 Issue. 9 (September 2021)
Pooja Kakde and Ajay R. Tembhurkar*
Visvesvaraya National Institute of Technology, Department of Civil Engineering, Nagpur – 440 010, India
Abstract
Oil contained wastewater discharged into the environment poses a serious threat. Removal of oil from wastewater is difficult mostly when the oil is present in a stable oil-in-water emulsion. Adsorption has emerged as a cost-effective technique due to the recent trend of developing adsorbents from agro-waste. This research focuses on developing novel adsorbents from waste coconut fibre in untreated raw coconut fibre (UCF), acid-alkali treated coconut fibre (ACF) and carbonized coconut fibre (CCF) form and comparatively evaluate the impact on oil adsorption capacity on these adsorbents developed through chemical and thermal treatment. Batch experiments were conducted to understand the influence of important operation parameter, namely pH (2-10), time of contact (10-150 min), adsorbent dose (0.5-7.5 g/L) and initial oil concentration (100-2000 mg/L). On comparison of equilibrium study, it revealed that thermo-chemically treated fibres (CCF) have higher adsorption capacity (16.22 mg/g) than chemically treated (8.81 mg/g) and raw coconut fibres (6.82 mg/g) and the present adsorption process fits Freundlich isotherm. The kinetic study indicates that it follows a pseudo-second-order kinetic model for UCF, ACF and CCF. Thermodynamically the process is endothermic and enthalpy value for CCF is 38.11 KJ/mol, ACF is 17.73 KJ/mol and UCF is 15.5 KJ/mol.
Keywords
oily wastewater, Adsorbents, adsorption equilibrium, kinetics, thermodynamics
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