Poll Res. 36 (3) : 428-436 (2017) Copyright © EM International ISSN 0257–8050 *Corresponding author’s email : Hamed.biglari@gmail.com ANILINE ADSORPTION FROM AQUEOUS SOLUTIONS USING DRIED ACTIVATED SLUDGE MOHAMMAD MOBINI 1 , HAMED BIGLARI 2,* , ABDOLAH DARGAHI 3 , AMIN ZAREI 4 , MOHAMMAD REZA NAROOIE 5 , EHSAN ABOUEE MEHRIZI 6 AND MOHAMMAD MEHDI BANESHI 7 1 Department of Environmental Health Engineering, School of Health, Rafsanjan University of Medical Sciences, Rafsanjan, Iran. 2 Department of Environmental Health Engineering, School of Public Health, Gonabad University of Medical Sciences, Gonabad, Iran. 3 Research Center for Environmental Determinants of Health (RCEDH), Kermanshah University of Medical Sciences, Kermanshah, Iran. 4 Department of Environmental Health Engineering, School of Health, Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran. 5 Department of Environmental Health Engineering, School of Public Health, Iranshahr University of Medical Sciences, Iranshahr, Iran. 6 Department of Environmental Health Engineering, Faculty of Public Health, North Khorasan University of Medical sciences, Bojnurd, Iran. 7 Social Determinants of Health Research Center, Yasuj University of Medical Sciences, Yasuj, Iran. (Received 1 February, 2017; accepted 30 July, 2017) ABSTRACT Aniline is a simple cyclic aromatic compounds and tough biodegradable as well as it is one the most widely used materials in various industries. This super-toxic substrate due to its high solubility can be found in abundance in surface and underground waters and has harmful effects on human health and the aquatic animals. The aim of the present study was to remove the aniline using dried activated sludge (DAS). In this experimental research, the effect of influencing variables such as pH (3, 5, 7, 9 and 11), contact time (15 to 120 min), adsorbent dose (0.2, 0.4, 0.6, 0.8 and 1.5 mg/l) and aniline initial concentration (10- 250 mg) were examined. Adsorption isotherms were assessed using Freundlich, Langmuir and Temkin isotherms, and uptake kinetic was evaluated by pseudo-first and second order kinetics. The results of the present study indicated that the maximum efficiency of dried activated sludge in the removal of aniline was equal to 75.12% and optimum conditions involving pH of 11, 30 min contact time, adsorbent dose of 0.6 mg/l and initial concentration of 100 mg/l. In addition, check out the adsorption isotherm demonstrated that the data were better matched with Langmuir adsorption model (R2 0.968) and was followed pseudo- first order kinetic model. KEY WORDS: Aniline, Bio-adsorption, Aqueous Solutions, Dried Activated Sludge INTRODUCTION One of the most common problems in majority of industries is high volume of wastewater disposal with high potential of toxic organic substances; annually thousands of compositions of these materials (Bazrafshan et al., 2012b, Alipour et al., 2017, Sohrabi et al., 2016), as toxic volatile organic compounds (VOCs) can be found in wastewater treatment and collection system (Biglari et al., 2016b, Biglari et al., 2016d; Sohrabi et al., 2017b). Therefore, how to remove these contaminants is of considerable importance (Mostafapour, 2011, Ahamadabadi et al., 2016). Aniline, C6H5NH2, is a