• Journal of Korean Society on Water Environment
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• v.22 no.4
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• pp.614-618
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• 2006

The purpose of this paper, was to compare its result with both the settler of inclination plate and the settler of stick fin through the pilot test to know optimized interval of fin. According to intervals of fin, We get most optimized interval of fin in laboratory is inclination plate with $60^{\circ}$ and wide of fin with 50 mm, interval of fin with 150 mm. The result of laboratory showed 67.6~70.6%, 70.4~74.2% for the settler of inclination plate, the settler of inclination plate stick fin. The sedimentation efficiency of the settler of inclination plate stick fin showed 2.8% higher than the sedimentation efficiency of the settler of inclination plate. From now on, Inclination plate settler stick fin requirement in study.

• Journal of Korean Society of Water and Wastewater
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• v.12 no.4
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• pp.106-111
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• 1998

In this paper,to know sedimentation efficiency compared with sedimentation efficiency's experiment result by general and inclination plate settler, its and fin stick of inclination plate. Experiment result is inclination plate settler increase sedimentation efficiency's 6.96% than general settler, When fin stick of inclination plate is the optimum condition of one side, inclination plate's angle $60^{\circ}$, fin's width 67mm, fin's interval 200mm, sedimentation efficiency of many experimental condition increase 6.63% than inclination plate settler. A studdy on the site plottage through the result, Water inclination plate settler of the present's application reduce 30% of its than general settler. According to the above statements, fin stick of inclination plate's sedimentation efficiency is 0.95 times of inclination plate settler's. Concluding remarks, Fin stick of inclination plate reduce 28.5% of its than inclination plate settler.

• Microbiology and Biotechnology Letters
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• v.20 no.5
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• pp.607-613
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• 1992

A tower fermentor equipped with a modified settler was used for ethanol fermentation using highly flocculating yeast, Saccharomyces uvarum. The settler was constructed of glass column divided into two chambers by a funnel shaped divider. Gas was allowed to escape from lower chamber of the settler through a small tube. This design significantly reduced the turbulence in upper chamber of the settler and made it possible to operate at high dilution rate. Using the tower fermentor, the effects of operating conditions such as initial glucose concentration, dilution rate and cell recycle ratio were studied. The maximum ethanol productivity, 64.0 g/l' h was obtained at a dilution rate 1.1 h -1 and a cell recycle ratio 5 with the corresponding ethanol concentration of 58.8 g/l, and cell mass of 88 g/l.

• Journal of Korean Society on Water Environment
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• v.21 no.1
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• pp.40-45
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• 2005

Sedimentation is one of the most common and important units in conventional water treatment plant. Structure such as various baffle walls and inclined plate settler may be obstacles to the horizontal flow when it is poorly designed. Therefore, the effects of these structures on characteristics of hydraulic flow must be evaluated to improve the settling efficiency of the floc. The hydraulic characteristic of the two sedimentations at Y water treatment plant (YWTP), which have different deflector baffles inside the settling basin, were investigated by tracer (fluoride) test. The inclined plate settler installed inside settling basin caused an undesirable impact on horizontal flow and produced dead zone. Solid baffle wall under the plate settler could help to minimize the formation of density currents and flow short circuiting. NaF used as a tracer was recovered more than 90% at investigated all basins. Morill index ($t_{90}/t_{10}$), Modal index ($t_p/T-HRT$) and short-circuiting index ($[M-HRT-t_p]/M-HRT$) were determined from tracer test results performed at YWTP. Those indices ranged 2.95~3.02, 0.40~0.53 and 0.32~0.46, respectively.

• Journal of Korean Society of Water and Wastewater
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• v.18 no.4
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• pp.427-436
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• 2004

Sedimentation is one of the most common and important units in conventional water treatment plants. Structure such as various baffle walls and inclined plate settler may be obstacles to the horizontal flow when it is poorly designed. Therefore, the effects of these structures on characteristics of hydraulic flow must be evaluated to improve the settling efficiency of the floc. The hydraulic characteristic of the four sedimentations at the three real WTPs (water treatment plants), which have different structural properties respectively inside the settling basin, were investigated by tracer (fluoride) test. The inclined plate settler installed inside settling basin caused a undesirable impact on horizontal flow and produced dead zone. Intermediate baffle and solid baffle wall under the inclined plate settler at GE plant help to minimize the formation of density currents and flow short circuiting. However, installing perforated baffle under the inclined plate settler at other plants could not induce even distribution of flow. NaF used as a tracer was recovered more than 90% at investigated all basin. Morill index ($t_{90}/t_{10}$), Modal index ($t_p/T-HRT$) and short-circuiting index ($[M-HRT-t_p/M-HRT$) were determined from tracer test results performed at three WTPs. Those indices ranged 2.99~3.45, 0.44~0.72 and 0.23~0.47, respectively.

• Biotechnology and Bioprocess Engineering:BBE
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• v.7 no.6
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• pp.357-361
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• 2002

Continuous production of lactic acid from glucose by Lactobacillus rhamnosus with cell recycling using an acoustic cell settler was carried out. The performance of the system, such as the concentration of cell and product were compared with the control experiment without recycling. The acoustic settler showed cell separation efficiency of 67% during the continuous operation and the cell concentration in the fermentor with recycle exceeded that of the control by 29%. Com-pared with the control, tactic acid production was increased by 40%, while glucose consumption was only increased by 8%. The higher value of lactic acid production to substrate consumption (Yp/s, product yield coefficient) achieved by cell recycling is interpreted to indicate that the recycled cell mass consumes less substrate to produce the same amount of product than the control Within system environmental changes due to the longer mean cell residence time induced the cells maintaining the metabolic pathways to produce Less by-Product but more product, lactic acid.

• KSBB Journal
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• v.4 no.2
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• pp.143-149
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• 1989

A cell sedimentaion system was designed and employed for the high culture of hydridoma. An upward divering cell settler allowed a good sedimentation of hybridoma but the accumulation of cell mass on the settler's wall side was a potential prolem. Although a cyinderical cell settler was useful to solve this problem, this device was employable only at low dilytion rate. A modified cell settler could support the high density culture of hybridoma at a concentration of $5{\times}10^6$ cell/ ml during 1 week, producting 380mg of monclonal antibody.

• Biotechnology and Bioprocess Engineering:BBE
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• v.9 no.6
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• pp.454-458
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• 2004

A study of the POSE (predispersed solvent extraction) for succinic acid by colloidalliq­uid aphrons was conducted. The organic phase contaning TOA (tri-n-octylamine) and 1-octanol permits a selective extraction of succinic acid from its aqueous solution. There was no difference of the extractability of POSE and that of conventional mixer-settler type extraction. Taking into account the no mechanical mixing in POSE, it was concluded that the POSE process is more adaptive than the conventional mixer-settler type extraction process. From mass transfer analysis at the various concentration of TOA in counter-current continuous operation, the concentration of TOA had no influence on the mass transfer coefficient. The loading values in continuous POSE were almost same as those in batch operation.

• Resources Recycling
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• v.16 no.5
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• pp.65-70
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• 2007

This study presents the findings of the experiments that were conducted on single- and multi-stage solvent extractors using the stimulus-response method, with the am of identifying flow characteristics of the material inside the mixer-settler-type extractor. The results of this study show that the response characteristics of a single-stage mixer is the same as that of a completely stirred tank reactor (CSTR), and that the lag time of a mixer-settler-type extractor increases with the number of its extraction stages. The experimental data for the single- and multiple-stage extractors were analyzed using K-RTD, a response analysis program, to obtain a retention time distribution (RTD) model of one-stage and four-stage extractors. The correlation coefficient between the calculated values and the experimental data was 0.963 for the one-stage extractor and 0.995 for the four-stage extractor, showing quite a good correlation.

• 수도
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• s.29
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• pp.18-29
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• 1983