The research on removal efficiencies of COD and NH4 + in landfill leachate by an application of the modified Eco - Bio -Block (EBB) material in Anoxic-Oxic (A-O) system was conducted in the laboratory scale. | Journal of Science and Technology 54 (2A) (2016) 1-5 REMOVAL OF COD AND AMMONIUM FROM LANDFILL LEACHATE BY USING A MODIFIED ECO - BIO – BLOCK MATERIAL IN ANOXIC-OXIC SYSTEM Hoang Luong*, Trinh Van Tuyen, Tang Thi Chinh, Dang Thanh Tu Institute of Environmental Technology, VAST, 18 Hoang Quoc Viet Road, Hanoi, Vietnam Email: independenthanoivn@ Received: 1 April 2016; Accepted for publication: 15 June 2016 ABSTRACT The research on removal efficiencies of COD and NH4+ in landfill leachate by an application of the modified Eco - Bio -Block (EBB) material in Anoxic-Oxic (A-O) system was conducted in the laboratory scale. The experimental results showed that the treatment efficiencies of COD and NH4+ were relatively high. Removal efficiencies of COD and NH4+ in two columns (anoxic and oxic) were 35% and 50%, respectively, after 19-hour in the experimental system at the flow rate of 1 liter per hour. The results of this study might suggest technical solutions toward landfill leachate treatment at the low cost. Moreover, this method could be widely applied to other wastewater sources suitable in the condition of Vietnam. Keywords: Eco - Bio - Block, Modified EBB, Bacillus natto, A-O system. 1. INTRODUCTION Currently, the leachate from the landfill site is an alarming issue in the big cities in Vietnam. Although many researches and applications were carried out to deal with the landfill leachate most of treatment plants did not met the environmental emission standard of Vietnam (type B for the target COD and ammonium in QCVN 25-2009/BTNMT that are lower 300 mg/L and 25 mg/L, respectively, after discharge). The main reasons for low treatment efficiency are the high content of persistent organic matter that is slowly biodegradable and the high loading of total nitrogen in the landfill leachate. Consequently, COD and total nitrogen content of the landfill leachate after biological treatment are often from 400 to 500 mg/L (mostly calcitrant COD) and approximately 100
