DEVELOPMENT OF LOW COST ADSORBENTS FOR THE REMOVAL OF WATER HARDNESS; AN EXPERIMENTAL STUDY AND MODELING OF NEWLY DEVELOPED ADSORBENT CONSIST OF COCONUT SHELL ACTIVATED CARBON, POLYSTYRENE RESIN AND CHEMICALLY MODIFIED SUGAR CANE BAGASSE.

Qazi Mohammed Omar, Ijlal Idrees, Adil Amin, Muhammad Awais, Javeed Ashraf Awan

Abstract


The coconut shell carbon (activated), poly-styrene resin from waste plastic and chemically modified sugarcane bagasse has been used in a fixed bed absorber for decreasing the hardness and total dissolved solids (TDS) from waste water stream. The adsorption experiments were carried out at three different bed heights (36, 29 and 20cm) for different total dissolved solids (TDS) concentrations. It is observed from this work that 80 % of total hardness (223 mg/lit of CaCO3) has been removed with a bed height of 36cm from waste water. It has also been observed that the hardness removal efficiencies decreases with the decrease of bed height. Moreover, for 342 mg/lit TDS at 36cm bed height, the TDS removal efficiencies were also more than 80% for all the adsorbents except for modified sugar cane bagasse. The Freundlich and Langmuir-2 models has been used for the calculation of maximum adsorption capacity (mg/g of adsorbent). The estimated Temkin model parameter shows ( Q) for all the adsorbents and confirm that adsorption is exothermic. It has been observed that the coconut shell activated carbon, synthetic resin from waste plastic and chemically modified sugar cane bagasse are promising low cost adsorbents for the removal of hardness (calcium and magnesium hardness) from drinking water.

Keywords


Coconut shell activated carbon, Sugar cane bagasse, polystyrene resin. Total water hardness, Water softening

Full Text: JPIChE 45(2) 2017 ID 299

Published by Pakistan Institute of Chemical Engineers (PIChE)

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