期刊名称：International Journal of Environmental Science and Development
印刷版ISSN：2010-0264
出版年度：2016
卷号：7
期号：3
页码：193-197
DOI：10.7763/IJESD.2016.V7.766
摘要：AbstractOne of the important concerns in Tehran municipal landfill is the production of leachate and its potential for water resources pollution. This paper investigates the removal of heavy metals from landfill leachate by using a combined system of a membrane Bioreactor (MBR) together with reverse osmosis. The leachate was collected from a landfill in the vicinity of Tehran nearly 1 year old, The data indicated that the system provided high removals of Fe, Ni, Cu, Zn, Pb, Cd and Cr equal to 98%, 79%, 85%, 85%, 87%, 82%, and 73% respectively and heavy metal concentration in MBR effluent is a function of aeration ratio and bioaccumulation. Among the metals investigated in the present study It can be concluded that the extracellular adsorption, is the principal removal process of the metals, compared to other removal mechanisms such as bioaccumulation or intracellular accumulation, Cu, Cr, Ni, Pb, Cd, Zn, and Fe, respectively, have higher capability of being adsorbed through biological processes by MLSS. Also, based on Freundlich Isotherm, Cr, Cd, Pb, Cu, Zn, and Fe, in turn, have the most saturation rate for every gram of MLSS and their maximum fast absorption is 0.000023, 0.0035, 0.22, 5, 6, 130 mg/g MLSS, respectively.
关键词：Adsorption; heavy metals; leachate; MLSS; membrane bioreactor
