• Korean Journal of Food Science and Technology
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• v.25 no.1
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• pp.69-77
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• 1993

Substrate removal efficiency of industrial wastewater from dye plant was investigated with fluidized-bed biofilm reactor(FBBR). Wastewater was diluted by 2, 3 and 6 times for experiment. When F/M ratio was increased 0.2 to 0.3, substrate removal efficiency of wastewater was rapidly decreased in all dilution ratio. Substrate removal efficiency was increased with dilution ratio in same F/M ratio, with hydraulic retention time. In case of 6 times diluted wastewater, below 0.2 F/M ratio, removal efficiency of BOD was $90{\sim}97%$. For reactor design, the parameters such as Y, $k_d$ and r was obtained as follows: $Y=0.3365\;k_d=0.03782\;day^{-1}\;r=0.997$ in 2 times diluted $Y=0.3341\;k_d=0.02750\;day^{-1}\;r=0.996$ in 3 times diluted $Y=0.3365\;k_d=0.03434\;day^{-1}\;r=0.998$ in 6 times diluted

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1999.11a
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• pp.57-60
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• 1999

순환유동층 보일러는 연소로 (상승관: riser)내에 공기를 고속으로 주입하여 비말동반되는 고체입자를 사이클론에서 포집 하여 재주입하는 유동층을 이르는 것으로, 난류유동층(turbulent fluidized bed), 고속유동층(fast fluidized bed) 그리고 희박상 유동(dilute phase flow) 영역에서 조업이 이루어진다. 순환유동층은 비교적 높은 기체 유속에서 조업이 이루어지기 때문에 고체입자의 혼합 및 비산 그리고 재순환이 격렬하게 이루어지고, 기-고체간 접촉효율 및 전열계수가 높아 전체적인 처리량 및 효율이 좋은 장점을 가지고 있다.(중략)

• 한국연소학회:학술대회논문집
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• 2014.11a
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• pp.25-28
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• 2014

In this study, waste cooking oil was gasified in a fluidized bed reactor. The main objective of this study was to produce clean producer gas for power generation engine. As a result, heating value of producer gas is suitable for engine operation and tar content in producer gas was satisfied after use of activated carbon filter. Results from a lab scale experiment and a preliminary results from a pilot scale experiment will be presented.

• Journal of Environmental Health Sciences
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• v.22 no.2
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• pp.96-103
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• 1996

The objectives of this study were to examine the biodegradation of phenol using the anaerobic fluidized bed reactor(AFBR). Mixed microorganisms were selected from the anaerobic digestion tank, and could be adapted to high concentration of phenol by increasing the phenol concentration 600-3600 mg/l step by step. The results were summarized as follows: 1. The average removal efficiency of phenol was 90%, decreased by increasing concentration of phenol, and then a shock range was 1200~2400 ppm. 2. The production rate of biogas in overall limits was proportional to the concentration of influent phenol. 3. At steady state, compositions of gases were $CH_4$ 55~60%, $C0_2$ 34~43%, respectively. These were similar to that of the theoretical estimates. 4. The production rates of biogas and methane per the molarity of phenol removed were linearly increased, 56.45 l gas/mol-phenol and 29.20 l $CH_4/mol$-phenol. Using this biogas, the recoverable energy was 269.1 kcal/mol phenol. It was 120.2 kcal/g-COD, transforming into the chemical oxygen demand. 5. The bulk of microorganisms existed in suspended section of fluidized bed with type of biofilm and its concentration was 340 mg/g-media. In conclusion, the anaerobic treatment of pure phenol was possible and its removal efficiency, introducing the AFBR, was successful. Also toxic organic compound such as phenol was biodegradable and was recoverable as resource of energy.

• Journal of Hydrogen and New Energy
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• v.23 no.1
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• pp.83-92
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• 2012

Syngas combustion characteristics of mass produced oxygen carrier particle (OCN706-1100) were investigated in a pressurized fluidized bed reactor using simulated syngas and air as reactants for reduction and oxidation, respectively. The oxygen carrier showed high fuel conversion, high $CO_2$ selectivity, and low CO concentration at reduction conditions and no NO emission at oxidation conditions. Moreover, OCN706-1100 particle showed good regeneration ability during successive reduction-oxidation cyclic tests up to the 10th cycle. Fuel conversion and $CO_2$ selectivity decreased and CO emission increased as temperature increased. These results can be explained by trend of calculated equilibrium CO concentration with temperature. However, fuel conversion and $CO_2$ selectivity increased and CO emission decreased as pressure and gas residence time increased.

• Journal of Hydrogen and New Energy
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• v.23 no.2
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• pp.173-182
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• 2012

Effects of temperature, pressure, and gas residence time on methane combustion characteristics of mass produced oxygen carrier particle (OCN706-1100) were investigated in a pressurized fluidized bed reactor using methane and air as reactants for reduction and oxidation, respectively. The oxygen carrier showed high fuel conversion, high $CO_2$ selectivity, and low CO concentration at reduction condition and very low NO emission at oxidation condition. Moreover OCN706-1100 particle showed good regeneration ability during successive reduction-oxidation cyclic tests up to the 10th cycle. Fuel conversion and $CO_2$ selectivity decreased and CO emission increased as temperature increased. These results can be explained by trend of calculated equilibrium CO concentration. However, $CO_2$ selectivity increased as pressure increased and fuel conversion increased as gas residence time increased.

• Korean Journal of Materials Research
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• v.18 no.8
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• pp.406-410
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• 2008

The properties of pyrolytic carbon (PyC) deposited from $C_2H_2$ and a mixture of $C_2H_2/C_3H_6$ on $ZrO_2$ particles in a fluidized bed reactor were studied by adjusting the deposition temperature, reactant concentration, and the total gas flow rate. The effect of the deposition parameters on the properties of PyC was investigated by analyzing the microstructure and density change. The density could be varied from $1.0\;g/cm^3$ to $2.2\;g/cm^3$ by controlling the deposition parameters. The density decreased and the deposition rate increased as the deposition temperature and reactant concentration increased. The PyC density was largely dependent on the deposition rate irrespective of the type of the reactant gas used.

• KSBB Journal
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• v.16 no.4
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• pp.337-343
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• 2001

Activated carbon particles of 1.274 mm diameter and sand particles of 0.455 mm diameter were employed as the support of the biofilm formed in fluidized bed biofilm reactors(FBBRs) for the wastewater denitrification. Ethanol was used as the electron donor in the anoxic respiration. The steady-state biofilm thickness increased as the nitrate loading rate increased, and the activated carbon particles induced thicker biofilm than the sand particles. The FBBRs with sand support showed higher efficiency and rate of the nitrate removal than those with activated carbon support, and exhibited the biomass concentration of 37 kg/㎥ and the nitrate removal rate of 21 kg N/㎥d.

• Journal of Environmental Health Sciences
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• v.19 no.2
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• pp.23-33
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• 1993

The anaerobic digestion of organic synthetic wastewater in anaerobic fluidized bed bioreactor (AFBBR) and anaerobic fluidized packed bed bioreactor (AFPBBR) was studied. This study was conducted to evaluate efficiency and reliability of two reactor. Experiment was performed to find the effect of upflow rate with AFBBR and the height of packed bed with AFPBBR. As a result, this program obtained several conclusion. These are given as follows: As applied the upflow rate increased in AFBBR the produced volume of biogas increased, while the gas production and COD removal decreased at above 0.3 m$^3$/h. When a upflow rate is 0.4 m$^3$/h in AFBBR the volatile suspended solid (VSS) became significantly increased. At an organic loading rate from 0.1 to 0.4 of upflow rate in AFBBR, the methane yield was 1.5584 m$^3$CH$_4$/kgCOD removed, and the observed cell yield coefficient was 0.0933 gVSS/gCOD. In case of AFPBBR, the results showed also that 20 cm of height of packed bed was superior to other in the aspect ot biogas production, the content of methane and COD removal. At 20 cm of height, the profile of microorganisms was stable, while at 30 cm the VSS of effluent became higher than AFBBR. Though COD removal of AFPBBR increased with packed bed, COD removal deteriorate with over packing because the loss of pressure became higher in the reactor. At an organic loading rate from 20 to 40 cm of packed bed in-AFPBBR, the methane yield was 2.5649 m$^3$CH$_4$/kgCOD removed, and the observed cell yield coefficient was 0.0506 gVSS/gCOD. Based upon the results obtained, it is suggested that AFBBR and AFPBBR is the most effective conditions at 0.3 m3/h of upflow rate, the 20cm of packed bed, respectively. The rate constant are summarized as follow:

• Journal of Microbiology and Biotechnology
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• v.13 no.2
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• pp.301-304
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• 2003

In this study, hydrogen sulfide ($H_2S$), ammonia ($NH_3$), and benzene, which represent the major odor from a natural leather process plant, were removed using a fluidized bed bioreactor and biofilter including Thiobacillus sp. IW and a MY microbial consortium. The critical removal rate was $12g m^{-3}h^{-1}\;for\;H_2S,\;11g m^{-3}h^{-1}\;for\;NH_3\;and\;28 g m^{-3}h^{-1}$ for benzene by the fluidized bed bioreactor, and $8.5g m^{-3}h^{-1}\;for\;H_2S\;7g m^{-3}h^{-1}\;for\;NH_3,\;and\;25 g m^{-3}h^{-1}$ for benzene in the biofilter. The average removal efficiency of $H_2S$, $NH_3$, and benzene by continuous operation for over 30 days with the fluidized bed bioreactor was $95{\pm}3\%,\;99{\pm}1\%,\;and\;98{\pm}5\%$, respectively, whereas that with the biofilter was $96{\pm}4\%,\;95{\pm}4\%,\;and\;97{\pm}3\%$, respectively. Therefore, the critical removal rate of $H_2S$, $NH_3$, and benzene was higher in the fluidized bed bioreactor, whereas the removal efficiency on the continuous operation was similar in both bioreactors.