• Title/Summary/Keyword: Fluidized Media

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Solid Circulation Rate in a 3-phase (gas/liquid/solid) Viscous Circulating Fluidized Bed

  • Jang, Hyung Ryun;Yoon, Hyuen Min;Yang, Si Woo;Kang, Yong
    • Korean Chemical Engineering Research
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    • v.56 no.2
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    • pp.186-190
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    • 2018
  • For the first time, the characteristics of solid circulation rate ($G_S$) were investigated in a three-phase (gas-liquid-solid) viscous circulating fluidized bed (TPCFB). The solid circulation rate was controlled separately by adjusting the experimental apparatus as well as operating variables. Effects of primary and secondary liquid velocities ($U_{L1}$ and $U_{L2}$), gas velocity ($U_G$), particle size ($d_p$), height of particles piled up in the solid recycle device (h), and viscosity of continuous liquid media (${\mu}_L$) on the value of $G_S$ were determined. The experimental results showed that the value of $G_S$ increased with increases in the values of $U_{L1}$, $U_{L2}$, h and ${\mu}_L$, while it decreased with increasing $U_G$ and $d_p$ in TPCFBs with viscous liquid media. The values of $G_S$ were well correlated in terms of dimensionless groups within this experimental conditions.

Effects of media weight and pre-ozonation on the biodegradability enhancement in biological fluidized bed (생물활성탄 유동상법에서 충전량과 전오존처리가 생물처리효율에 미치는 영향)

  • 우달식;곽필재;남상호
    • Journal of environmental and Sanitary engineering
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    • v.12 no.1
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    • pp.69-75
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    • 1997
  • Biological drinking water treatment is widely used in Europe for the removal of ammonia nitrogen and organics. During the last 16 years, the deterioration of the quality of surface waters used to produce drinking water has resulted in the widespread use of ozone-biological treatment in Korea. This study were conducted to determine the effect of media weight and preozonation on the biodegradability enhancement in biological fluidized bed(BFB) using Han river water. When the carbon weight was increased, $NH_{3}-N$ and DOC removal increased, but turbidity and SS removal decreased. To remove turbidity and SS, the bed depth in 40% expansion rate/total bed depth was very important. Preozonation of raw water was not effective in $NH_{3}-N$, but increased in biodegradable organic fraction about 10-30% with 0.425-0.85 mg $O_{3}/mg$ DOC.

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A Study on the Wastewater Treatment Characteristics according to Operating Condition of the Indirectly Aerated Fluidized Bed (간접(間接) 포기식 유동상(流動床)의 운전조건(運轉條件) 변화에 따른 처리(處理) 특성(特性)에 관한 연구 -오니전환율 및 산소이용속도를 중심으로-)

  • Lee, Jeoung-Su
    • Journal of Korean Society of Water and Wastewater
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    • v.11 no.3
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    • pp.79-86
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    • 1997
  • The characteristics of wastewater treatment according to operating condition of indirectly aerated fluidized bed filled with sand media were studied experimentally, and the obtained results were as follows; 1. During be operated under the BOD loading rate, $4.5kg-BOD/m^3{\cdot}day$, effluent SS according to the increase of recirulation velocities was gradually decreased. 2. According to the increase of media concentration, sludge convertion rate was gradually increased. 3. Under the same BOD loading rate, according to the increase of recirulation velocities, F/M ratio was gradually increased, however, sludge convertion rate was greatly decreased. On the other hand, inffluent BOD concentration has not an important effect. 4. Under the constant recirulation velocities, according to the increase of BOD loading rate, sludge convertion rate was gradually increased. 5. Under the same BOD loading rate, according to the increase of recirulation velocities, oxygen consumpion rate of microorgnism was gradually increased.

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Simultaneous Nitrification and Denitrification in a Fluidized Biofilm Reactor with a Hollow Fiber Double Layer Biofilm Media (이중층 중공사 생물막 담체를 이용한 유동층 생물막 반응기에서의 동시 질산화와 탈질)

  • 이수철;이현용;김동진
    • KSBB Journal
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    • v.15 no.5
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    • pp.514-520
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    • 2000
  • Simultaneous nitrification and denitrification of ammonia and organic compounds-containing wastewater were performed in a fluidized bed biofilm reactor with polysulfone(PS) hollow fiber as a double layer biomass carrier. The PS hollow fiber fragment has both aerobic and anoxic environments for the nitrifiaction and denitrification at the shell and lumen-side respectively. The reactor system showed about 80% nitrification efficiency stably throughout the ammonia load conditions applied in the experiment. Denitrification efficiency depended on organic load and C/N ratio. High free ammonia concentration and low dissolved oxygen resulted in nitrite accumulation which leads to enhance organic carbon efficiency in denitrification when compared to nitrate denitrification. The simultaneous nitrification and denitrification reactor system has an economic advantages in reduced chemical cost of organic carbon for denitrification as well as compact reactor configuration.

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Anaerobic Degradation of Inhibitory Organics using Fluidized Bed Reactor -Increase of Phenol Loading Rate- (유동층 반응기를 이용한 저해성 유기물의 혐기성 분해 -페놀 부하 증가 중심으로-)

  • 박동일;최석규;김재우
    • Journal of Environmental Health Sciences
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    • v.24 no.2
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    • pp.57-67
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    • 1998
  • The characteristics of anaerobic degradation of phenol were studied in a fluidized bed reactor using a granular activated carbon as media. Increasing the phenol loading rate with variation of feed concentration was considered as an experimental variable. In the present anaerobic fluidized-bed reactor, the removal efficiency of phenol and COD was maintained about 93-99% and 91-96%, respectively, up to 3.6 kg-phenol/$m^3\cdot d$ of the phenol loading rate, but it was abruptly decreased under 5.0 kg-phenol/$m^3\cdot d$. The volumetric production of biogas per removed phenol was decreased linearly between 0.80-1.27 m$^3$ gas/kg-phenol (0.35-0.56 m$^3$-gas/kg-COD), increasing the phenol loading rate, and the methane content of biogas was 55-60% as similar to that estimated theoretically up to 3.6 kg-phenol/$m^3\cdot d$. But the production rate and methane content of biogas were suddenly decreased at the loading rate of 5.0 kg-phenol/$m^3\cdot d$. Therefore, the anaerobically biodegradable phenol loading rate of the present reactor was 3.6 kg-phenol/$m^3\cdot$ d in order to accomplish over 90% of the removal efficiency.

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Sewage Disposal by Different Structure of Fluidized Bed Biofilm Reactor (유동층 생물반응기의 구조변화에 따른 하수처리)

  • Park, Jong-Man;Lee, Jae-Yong;Kim, Chul-Kyoung;Koh, Chang-Woong;Kim, Nam-Ki
    • Journal of Korean Society of Water and Wastewater
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    • v.18 no.2
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    • pp.181-187
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    • 2004
  • The purpose of this study is to investigate the biofilm reactors capable of doing high efficiency treatment. Vertical fluidized bed biofilm reactor(VFBBR) and spiral fluidized bed biofilm reactor(SFBBR) was used for their performence in biodegradation of artificial sewage. The factors influencing the efficiency of those reactors were compared with difference of physical condition. They had same size but different structure to gain access of its unique characteristics. When recycle solution with flow rate of 22 mL/min and artificial sewage with flow rate of 2~10 mL/min were fed into two reactors in aerobic state, the average $COD_{cr}$, removal rate for biodegradation of SFBBR was greater than VFBBR. After reactor feed sewage was constantly maintained as flow rate of 4 mL/min and the recycle solution were changed to 10~32 mL/min respectively, the average $COD_{cr}$ removal rate of artificial sewage in SFBBR was greater than VFBBR. In this experiment for addition of support media into two reactors SFBBR was 4.1% excellent than VFBBR. Above all, SFBBR excelled VFBBR in boidegradation of organic matter in sewage.

The High Rate Denitrification of Nitric Acid Wastewater in a Fluidized Bed Biofilm Reactor (유동층 생물막 반응기를 이용한 고농도 질산성 폐수의 탈질화에 관한 연구)

  • 신승훈;김민수;박동일;안재동;장인용
    • Journal of Environmental Health Sciences
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    • v.23 no.1
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    • pp.95-104
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    • 1997
  • The objectives of this study are to investigate the effect of media on the removal efficiency of nitrate-nitrogen and the biofilm thickness in the fluidized bed biofilm reactor(FBBR) used for the high rate denitrification of nitric acid wastewater. Granular activated carbon(GAC) of 1.274 mm diameter and sand of 0.455 mm diameter were used as the media in the FBBR of 0.05 m diameter and 1.5 m height. As the nitrate-nitrogen concentration of the influent was increased stepwise from 600 to 4800 mg/l, the nitrate- and nitrite-nitrogen concentration of the effluent, biofilm thickness and biofilm dry density were measured to study the effects of media on the denitrification efficiency. The biofilm thickness increased with the substrate loading rate, and the biofilm dry density decreased with the increase of the biofilm thickness. At the influent nitrate-nitrogen concentration of 2400 mg/l, the removal efficiency in the FBBR with GAC was 88%, while that in the FBBR with sand was 99.6%. The biofilm in the FBBR with GAC was so thick, 754.9 $\mu$m, as to increase the mass transfer resistance, compared to that, 143.7 $\mu$m, in the FBBR with sand. The maximum specific denitrification rate in the FBBR with GAC was 15.0 kg-N/m$^3\cdot$ day, while that in the FBBR with sand was 18.0 kg-N/m$^3\cdot$ day. The biomass concentration in the FBBR with sand exhibited the high value 37 kg/m$^3$.

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Examine the Proper Operating Conditions in the Seawater Fluidized Bed filter System (해수 유동층 여과시스템의 적정 운용 조건)

  • Son Maeng-Hyun;Cho Kee-Chae;Jeon Im-Gi;Lim Han Kyu;Park Min-Woo
    • Journal of Aquaculture
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    • v.18 no.4
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    • pp.280-286
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    • 2005
  • Experiments were conducted to examine the differences in ammonia removal rates with the different filter media between sand and zeolite, the expanding rates between $50\%$ and $100\%$, the water temperatures between $15^{\circ}C$ and $25^{\circ}C$, and the ammonia loading rates between 2 mg/L and 5 mg/L in the seawater fluidized bed filters system (FBF). The 2.1 m high FBF (8.3 cm diameter) consisted of the clear acrylic for the upper half and a PVC pipe for the lower half, Sand and zeolite were used as the filter media in sizes of 0.5$\pm$0.1mm. Each biofilter contained 5.4 L of media. The ammonia removal rates of the biofilter were higher at the $25^{\circ}C$ water temperature than those of the biofilter at $15^{\circ}C$ water temperature, and higher at the $50\%$ expanding rate of filter media than those of the biofilter at $100\%$ expanding rate of filter media. Also, the ammonia removal rates of FBF were higher at 5 mg/L ammonia concentration than those of FBF at 2 mg/L ammonia concentration in rearing water. With these better conditions the ammonia removal rates of FBF per day are practically acceptable and ranged ken 80.6 to $210.6g/m^3$.

Hydraulic Characteristics of Anaerobic Fluidized Bed Bioreactor (혐기성 유동상 반응기의 수리학적 특성)

  • Seok, Jong-Hyuk
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.2
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    • pp.90-96
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    • 2018
  • Tracer experiments were carried out on two laboratory modes, "without media mode" and "with media mode", to examine the hydraulic characteristics of the anaerobic fluidized bed bioreactor (AFBR). For both configurations, a formula was derived for the hydraulics and data interpretation to obtain the actual characteristics of the reactor. The dispersion model is based on the assumption that carriers are non-reacting and the dispersion coefficient is constant. The model represents the one-dimensional unsteady-state concentration distribution of the non-reacting tracer in the reactors. The experimental results showed that the media increased the mixing conditions in the reactor considerably. For the reactor without media, in the range tested, the dispersion coefficient was at least an order of magnitude smaller than that of the reactor with media. Advective transport dominates and the flow pattern approaches the plug flow reactor (PFR) regime. The dispersion coefficient increased significantly as us, the superficial liquid velocity, was increased proportionally to 0.82cm/s. On the other hand, for the reactor with media, the flow pattern was in between a PFR and a completely mixed flow reactor (CMFR) regime, and the dispersion coefficient was saturated at us=0.41cm/s, remaining relatively constant, even at us=0.82cm/s. The dispersion coefficient depends strongly on the liquid Reynolds number (Re) or the particle Reynolds number (Rep) over the range tested.

A Study on the Effect of Fluidizing Media on the N2O Production in Fluidized Bed Incineration of Sewage Sludge (하수슬러지 유동층 소각에서 유동매체가 N2O 발생에 미치는 영향에 관한 연구)

  • Park, Jong-Ju;Lee, Seung-Jae;Ryu, In-Soo;Jeon, Sang Goo;Park, Yeong-Sung;Moon, Seung-Hyun
    • Clean Technology
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    • v.20 no.4
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    • pp.390-397
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    • 2014
  • This study was performed to investigate the effects of fluidizing media on $N_2O$ production in fluidized bed incineration of sewage sludge. The fluidized media were prepared in a form of 2 mm bead by mixing zeolite powders in our lab. Sand having 0.4 mm of the mean size showed 0.44 m/s of minimum fluidization velocity ($U_{mf}$), while the prepared zeolite media 0.5 m/s. When the ratio of fluidizing media height to the inside diameter of the incinerator (bed aspect ratio) increased from 1.4 to 3.1, it was found that $U_{mf}$ of the zeolite media was varied from 0.5 m/s to 0.7 m/s. Under the operation conditions in 1.79 of excess air ratio, $909^{\circ}C$ of bed temperature and ca. 1.65 m/s of superficial velocity, as the weight of fluidizing meadia was increased, $O_2$ concentration in the flue gas was slightly decreased, and $CO_2$ increased. Above 6 kg of fluidizing media weight (1.98 of bed aspect ratio), it was observed that $N_2O$ concentration was significantly reduced, which might result from the decomposition of $N_2O$ on the zeolite media rather than transformation of $N_2O$ to NOx. On the other hand, in a variation of the zeolite media mixing ratio to sand and bed temperature at a constant total bed height, significant difference was exhibited in $N_2O$ emission concentration according to the temperature. Considering the operation temperature in the incineration, the effective calcination temperature of the zeolite media was suggested to be around $900^{\circ}C$.