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Production and Evaluation of Synthetic Carbonated Sand as an Adsorbent Media for Batch Adsorption Process

Journal of Environmental Science and Engineering(A) 2013年第7期2卷 453-463页

作者： Rafa Hashim A1-Suhaili Diheyaa Waj id Abbood Haider Ali Mehdi Department of Civil Engineering College of Engineering University of Baghdad Baghdad lraq A Visiting Prof. at the CityCollege of New York New York USA Department of Environmental Engineering College of Engineering University of Al-Mustansiriya Baghdad Iraq

An attempt was made to improve the adsorption capability of the normal sand to be used as adsorbent for phenol and cadmium This has been done by producing a coated sand media. The coating process was done using emulsion asphalt to convert the normal sand to carbonated sand by using chemical treatment with sulfuric acid. The production process involves mixing of the sand with asphalt and an acid, then subjecting the mix to a heating process. Different mixing ratios, heating temperatures and times （activation times） were tried to obtain the optimum conditions at which the highest removal efficiency is obtained. Three types of acids were tried acetic acid, phosphoric acid and sulfuric acid. It was found that the sulfuric acid requires the lowest activation time, hence selected for the production. The removal efficiency of the produced media was significantly affected by the temperature, mixing ratio and activation heating time. The results show that, the optimum conditions for the production process are 350 , （1：2：3）（Asphalt/acid/sand） and 52 min for temperature, mixing ratio and activation heating time respectively. The final product was tested and found effective as an adsorbent media for phenol and cadmium. The removal efficiencies of these two pollutants in a batch adsorber were found 82.42% and 86.67%, respectively. The X-R diffraction and FTIR spectra tests had proved this media as an adsorbent.

关键词： Carbonated sand adsorbent media organic and inorganic emulsion asphalt optimum conditions mixing ratio,activation time removal efficiency.

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