In this study, a two-stage bioreactor, which consists of a biotrickling filter module and a biofilter module in a series, was investigated for the treatment of a mixture of volatile organic compounds (VOCs). Toluene and methyl ethyl ketone (MEK) were used as model VOCs. The objectives of this study ...
In this study, a two-stage bioreactor, which consists of a biotrickling filter module and a biofilter module in a series, was investigated for the treatment of a mixture of volatile organic compounds (VOCs). Toluene and methyl ethyl ketone (MEK) were used as model VOCs. The objectives of this study were to examine bioreactor performance under various operating conditions and to determine the effect of substrate interaction between the VOCs in the bioreactor. The experimental study was divided into two main phases, Phase A and Phase B. In Phase A, the bioreactor was operated at the constant inlet VOC concentration of 100 ppm, while the gas flow rate was altered, yielding various VOC loading rates. During an initial acclimation period, toluene was fed as a single substrate to enhance the accumulation of toluene-degrading microorganisms , and it was found that removal efficiencies were a function of microbial density in the biotrickling filter module. When the VOC mixture was introduced after the acclimation period, MEK was mostly removed in the front biotrickling filter and toluene was degraded in the following biofilter module. However, when the inlet loading of the VOC mixture was doubled, the removal efficiency of toluene was significantly dropped since MEK could not effectively removed in the biotrickling filter. Furthermore, the toluene elimination capacity determined when the VOC mixture was fed was much lower than that determined at the single VOC condition. These findings indicate that a substrate inhibition or a preferential utilization of readily-degradable substrates resulted in the decrease in toluene removal capacity. In Phase B, the total inlet loading was maintained at 43 g/㎥/hr, while the concentration of each compound and the mixing ratio between the two compounds were altered. Due to the substrate interaction, the highest performance of the bioreactor was obtained when toluene and MEK were supplied at 13 g/㎥/hr, 30 g/㎥/hr, respectively. In addition, when the gas flow rate was doubled but the total loading was unchanged, the removal efficiency of toluene was significantly dropped since the mass transfer limitation became severe at the short empty bed residence time of 0.5 minute. Overall, In order to optimize the two-stage bioreactor performance , the bioreactor should be operated in the condition where the substrate interaction could be minimized.
In this study, a two-stage bioreactor, which consists of a biotrickling filter module and a biofilter module in a series, was investigated for the treatment of a mixture of volatile organic compounds (VOCs). Toluene and methyl ethyl ketone (MEK) were used as model VOCs. The objectives of this study were to examine bioreactor performance under various operating conditions and to determine the effect of substrate interaction between the VOCs in the bioreactor. The experimental study was divided into two main phases, Phase A and Phase B. In Phase A, the bioreactor was operated at the constant inlet VOC concentration of 100 ppm, while the gas flow rate was altered, yielding various VOC loading rates. During an initial acclimation period, toluene was fed as a single substrate to enhance the accumulation of toluene-degrading microorganisms , and it was found that removal efficiencies were a function of microbial density in the biotrickling filter module. When the VOC mixture was introduced after the acclimation period, MEK was mostly removed in the front biotrickling filter and toluene was degraded in the following biofilter module. However, when the inlet loading of the VOC mixture was doubled, the removal efficiency of toluene was significantly dropped since MEK could not effectively removed in the biotrickling filter. Furthermore, the toluene elimination capacity determined when the VOC mixture was fed was much lower than that determined at the single VOC condition. These findings indicate that a substrate inhibition or a preferential utilization of readily-degradable substrates resulted in the decrease in toluene removal capacity. In Phase B, the total inlet loading was maintained at 43 g/㎥/hr, while the concentration of each compound and the mixing ratio between the two compounds were altered. Due to the substrate interaction, the highest performance of the bioreactor was obtained when toluene and MEK were supplied at 13 g/㎥/hr, 30 g/㎥/hr, respectively. In addition, when the gas flow rate was doubled but the total loading was unchanged, the removal efficiency of toluene was significantly dropped since the mass transfer limitation became severe at the short empty bed residence time of 0.5 minute. Overall, In order to optimize the two-stage bioreactor performance , the bioreactor should be operated in the condition where the substrate interaction could be minimized.
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#이단 미생물 반응조 혼합 VOCs 제거
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