The Role of bentonite soil and Activated carbon in absorption of polycyclic Aromatic hydrocarbons of polluted wastewater in Tehran Oil Refinery

Subject Areas :

حمید Bagheri ¹ (کارشناس ارشد مهندسی عمران محیط زیست دانشگاه صنعتی خواجه نصیر الدین طوسی)
فرید Vafaei ² (دانشیار گروه مهندسی عمران محیط زیست دانشگاه خواجه نصیر الدین طوسی)
سیامک Bodaghpour ³ (استادیار گروه مهندسی عمران محیط زیست دانشگاه خواجه نصیر الدین طوسی)
S.A Mirbagheri ⁴ (استاد گروه مهندسی عمران محیط زیست دانشگاه خواجه نصیر الدین طوسی)

Received: 2016-08-26 Accepted : 2016-08-26 Published : 2014-12-22

Keywords: absorption, Geology, Absorption isotherm, wastewater, Polycyclic Aromatic Hydrocarbons,

Abstract :

One of the serious environmental problems that could cause irreversible ecological and economic damage to theenvironment is organic pollutants. Contamination with organic pollutants is a very serious issue that is of interestto the general public because in some cases, it causes serious damages to the environment, soil and water as well.Polycyclic aromatic hydrocarbons which are abbreviated as PAHs are one of the major groups of organicsubstances soluble in water due to the geological conditions of the region. Various methods are used to clean uppolluted aquatic environments among which the use of oil absorbent material to remove different kinds ofcontaminants, particularly petroleum compounds and its derivatives (Polycyclic aromatic hydrocarbons) ishighly regarded. PAHs absorption by the bentonite and activated carbon is considered in this research. Then,PAHs distribution coefficient and the maximum absorption have been determined according to the results usingFreundlich absorption isotherms, and Langmuir isotherm. Results show that the bentonite has a high potential forPAHs absorption. Distribution coefficient (kd) and the maximum absorption are 0.005 L/g and 0.157 mg/g.