نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی عمران- دانشکده فنی و مهندسی-دانشگاه خوارزمی- تهران- ایران
2 دانشکدة فنی و مهندسی، دانشگاه خوارزمی
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The leachate generated at municipal solid-waste landfills contains complex, recalcitrant, and potentially toxic constituents; therefore, it should be treated before discharge to the environment and groundwater. In this study, leachate samples were collected from the Aradkouh Waste Management Complex (Kahrizak, Tehran, Iran) and treated using an electrocoagulation (EC) process. The effects of initial pH (4, 7, and 9), current density (25.31, 37.97, and 50.63 mA/cm²), reaction time (15–60 min), and inter-electrode distance (1, 2, and 4 cm) were evaluated for the removal of chemical oxygen demand (COD), total dissolved solids (TDS), and total suspended solids (TSS). Experiments were conducted in a plexiglass batch reactor equipped with three aluminum electrodes and powered by a direct-current supply. Under the optimum conditions (pH 9, 50.63 mA/cm², 60 min, and 2 cm), removal efficiencies of COD, TDS, and TSS reached 37.8%, 34.3%, and 40.2%, respectively. In addition, concentrations of Cr, Pb, Zn, and Fe were determined in raw and treated leachate using atomic absorption spectrometry, with corresponding removal efficiencies of 43.75%, 41.43%, 37.50%, and 27.23%. Overall, the results indicate that electrocoagulation can serve as an effective pretreatment option for reducing the pollutant load of highly concentrated landfill leachate.
کلیدواژهها [English]