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In this paper, an electrocoagulation reactor was set up to investigate the ammonium removal in Nam Son landfill leachate. The research focused on studying several factors that affect to the ammonium removal namely current intensity, operating time, initial pH and electrode materials. | VNU Journal of Science: Earth and Environmental Sciences, Vol. 33, No. 2 (2017) 71-77 Electrocoagulation for Ammonium Removal in Nam Son Landfill Leachate Le Thanh Son1,*, Le Cao Khai2, Nguyen Thi Ha3, Doan Tuan Linh1, Doan Thi Anh3 1 Institute of Environmental Technology, Vietnam Academy of Science and Technology, Building A30, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam 2 Faculty of Chemistry, Hanoi Pedagogical University No2, Nguyen Van Linh, Xuan Hoa, Phuc Yen, Vinh Phuc, Vietnam 3 Faculty of Environmental Science, VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam Received 27 March 2017 Revised 28 April 2017; Accepted 28 June 2017 Abstract: In this paper, an electrocoagulation reactor was set up to investigate the ammonium removal in Nam Son landfill leachate. The research focused on studying several factors that affect to the ammonium removal namely current intensity, operating time, initial pH and electrode materials. A mono-polar electrocoagulation reactor was set up in a batch system with iron electrodes and 1.8 L leachate. The research indicated that current intensity and operating time are directly proportional with NH 4+ treatment performance. When applied current increased from 1 to 4A, the NH4+ removal percentage went up from 14.03 to 24.99% after a 1 hour treatment. The effect of initial pH in range of 5 to 10 has showed that the best NH4+ treatment efficiency in neutral and mild alkaline conditions. It is noticeable that iron electrodes had higher NH 4+ removal than aluminum one during nearly the first 40 min, however this trend has been reversed later with the advantage belonging to aluminum anode. The optimum operating conditions found are aluminum electrodes, applied current of 3A, electrolysis time of 60 min, raw pH of 8, resulting in NH4+ treatment performance of approximately 24%. As a result, the electrocoagulation method is not really effective in NH4+ removal and might be applied as a pre-treatment. Keywords: Ammonium, .
