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A Study on Degradation of Nitrogen Compounds by Biofilm Reactor Packed with Porous Media  

Cho, Hae-Mi (Department of biotechnology Environmental engineering, Clean Environmental Research Institute, The Catholic university of Korea)
Kim, So-Yeon (Department of biotechnology Environmental engineering, Clean Environmental Research Institute, The Catholic university of Korea)
Yoon, Ji-Hyun (Department of biotechnology Environmental engineering, Clean Environmental Research Institute, The Catholic university of Korea)
Han, Gee-Bong (Department of biotechnology Environmental engineering, Clean Environmental Research Institute, The Catholic university of Korea)
Publication Information
Journal of Korean Society on Water Environment / v.23, no.5, 2007 , pp. 776-780 More about this Journal
Abstract
A biofilm reactor packed with porous media was investigated for nitrogen removal of synthetic wastewater. The effect of different loading rates on the nitrification was sustained to be steady state with stable efficiency of 50~60% in the range of $0.0083{\sim}0.017gNH_4-N/gMLVSS{\cdot}day$ of F/MN ratio and $1{\sim}2kgNH_4-N/m^3{\cdot}day$ of media volumetric loading rate. However, nitrification efficiency was rapidly decreased to 25~30% as F/MN ratio and media volumetric loading rate were increased to the range of $0.025{\sim}0.034gNH_4-N/gMLVSS{\cdot}day$ and $3{\sim}4kgNH_4-N/m^3{\cdot}day$, respectively. Also the consumption rate of alkalinity was higher under 8 hours of HRT than unter 6 hours of HRT. Accordingly the influent loading rate variation by detention time with influent flow influenced more on the nitrification efficiency than the influent loading rate variation by the influent concentration did. The temperature effect on the nitrification showed 25% higher in summer than in winter as the results reported by other researchers who reported that the nitrification efficiency in biofilm showed 20% increase from 55% to 75% when the temperature was raised from $20^{\circ}C$ to $25^{\circ}C$. Denitrification with sulfur-media showed 90% removal efficiency under steady-state with no effect from the increase of influent concentration and empty bed contact time (EBCT) change such as EBCT was decreased from 8.4 hr to 4.3 hr and $NO_3-N$ loading rate was changed within the range of $0.1{\sim}0.4kgNO^3-N/m^3{\cdot}day$. Accordingly Denitrification with sulfur-media is feasible for post denitrification at the concentration less than $80mgNO^3-N/L$.
Keywords
Denitrification; Loading rate; Nitrification; Porous-media; Sulfur-media;
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Times Cited By KSCI : 1  (Citation Analysis)
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