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Nitrogen Removal in Fluidized Bed and Hybrid Reactor using Porous Media  

Jun, Byong-Hee (Institute of Construction Technology, Chungbuk National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.5, 2005 , pp. 542-548 More about this Journal
Abstract
A fluidized bed reactor containing porous media has been known to be effective for nitrogen and organic matters removal in wastewater. The porous media which attached microbes plays important roles in simultaneous nitrification/denitrification (SND) due to coexistence of oxic, anaerobic and anoxic zone. For SND reaction, oxygen and organic substrates should be effectively diffused from wastewater into the intra-carrier zone. However, the overgrowth heterotrophic microbes at the surface of porous media may restrict from substrates diffusion. From these viewpoints, the existence and effect of heterotrophic bacteria at surface of porous media might be the key point for nitrogen removal. A porous media-membrane hybrid process was found to have improved nitrogen removal efficiency, due to stimulated denitrification as well as nitrification. Microelectrode studies revealed that although intra-media denitrification rate in a conventional fluidized bed was limited by organic carbon, this limitation was reduced in the hybrid process, resulting in the increased denitrification rate from 0.5 to $4.2\; mgNO_3-N/L/hr$.
Keywords
Membrane; Nitrogen Removal; Simultaneous Nitrification and Denitrification; Microelectrode;
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