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High-Rate Biological Nitrogen Removal from Plating Wastewater using Submerged MBR Packed with Granular Sulfur  

Kim, Dae-young (인하대학교 환경토목공학부)
Moon, Jin-young (인하대학교 환경토목공학부)
Baek, Jin-uk (인하대학교 환경토목공학부)
Hwang, Yong-woo (인하대학교 환경토목공학부)
Publication Information
Journal of Korean Society of Water and Wastewater / v.19, no.2, 2005 , pp. 200-208 More about this Journal
Abstract
In this study, a new submerged membrane bioreactor process packed with granular sulfur (MBR-GS) was operated to identify the biological nitrogen removal behaviors with plating wastewater containing high-strength $NO_3{^-}$ concentration. The continuous denitrification was carried out at $20^{\circ}C$ with various nitrogen loading rates using synthetic wastewater, which composed of $NO_3{^-}$ and $HCO_3{^-}$, but also actual plating wastewater, which was collected from the effluent of the H metal plating company. As a result, high-rate denitrification in the range of $0.8kg\;NO_3{^-}-N/m^3\;day$ was accomplished at nitrogen loading rate of $0.9kg\;NO_3{^-}-N/m^3\;day$ using synthetic wastewater. Also, higher-rate denitrification with actual plating wastewater was achieved up to $0.91kg\;NO_3{^-}-N/m^3\;day$ at the loading rate of $1.11kg\;NO_3{^-}-N/m^3\;day$. Additionally, continuous filtration was possible during up to 30 days without chemical cleaning in the range of 20 cmHg of transmembrane pressure. On the basis of the proposed stoichiometry, ${SO_4}^{2-}$ production could be estimated efficiently, while observed alkalinity consumption was somewhat lower than theoretical value. Consequently, a new process, MBR-GS is capable of high-rate autotrophic denitrification by compulsive flux and expected to be utilized as an alternative of renovation techniques for nitrogen removal from not only plating wastewater but also municipal wastewater with low C/N ratio.
Keywords
Autotrophic denitrification; submerged membrane bioreactor; granular sulfur; plating wastewater; stoichiometry;
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