• 대한환경공학회지
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• 제29권2호
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• pp.176-183
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• 2007

안 등이 보고한 모형 하상여과정의 수평집수관에 대한 여러 가지 측정치를 해석하기 위해 집수관에서의 흐름을 모사하는 수학적 모델을 개발하였다. 집수관 각 부위에서의 여과수 유입율 측정치와 본 연구에서 개발된 모델 예측치를 비교하였으며, 두 값은 잘 부합하였다. 이 모델을 이용하여 수평집수관 내부의 흐름에 대한 저항 즉, 조도계수를 구했고, 여러 실험조건에서 얻은 집수관의 조도 계수를 분석한 결과 집수정 유입유속이 커짐에 따라 조도계수는 증가하지만 정상적인 하상여과의 경우에는 0.012-0.015로 거의 일정함을 알 수 있었다. 또한, 집수관의 직경이 커지면 조도계수는 감소함을 알 수 있었다.

• Journal of Acupuncture Research
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• 제23권6호
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• pp.85-101
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• 2006

Objectives : This study was designed to find out correlation of filtration rate of herbal-acupunctures and pain score of herbal acupuncture stimulation. Methods : Filtration rate of Hwangryunhaedoktang herbal acupuncture, Kidney yang deficiency number two herbal acupuncture, Hominis Placenta herbal acupuncture, Cervus Elaphus herbal acupuncture, BUM herbal acupuncture and Carthami Flos herbal acupuncture were measured at the korean institute of herbal acupuncture. And Hwangryunhaedoktang herbal acupuncture, Kidney yang deficiency number two herbal acupuncture, Hominis Placenta herbal acupuncture, Cervus Elaphus herbal acupuncture, BUM herbal acupuncture and Carthami Flos herbal acupuncture were injected at Xie points of the subjects. Results : Ranking of herbal acupunctures filtration rates is the same as ranking of pain score and duration time of herbal acupuncture. Correlation analysis result of herbal acupunctures filtration rates and herbal acupuncture VAS with a simple linear regression analysis is that correlation coefficient of Hwangryunhaedoktang herbal acupuncture, Kidney Yang Deficiency Number Two herbal acupuncture, Hominis Placenta herbal acupuncture, Cervus elaphus herbal acupuncture, BUM herbal acupuncture. Carthami Flos herbal acupuncture is 0.44, 0.53, 0.58, 0.76, 0.47 and 0.54. Correlation analysis result of herbal acupuncture's filtration rates and herbal acupuncture stimulation's duration time is that correlation coefficient of Hwangryunhaedoktang herbal acupuncture, Kidney Yang Deficiency Number Two herbal acupuncture, Hominis Placenta herbal acupuncture, Cervus Elaphus herbal acupuncture, BUM herbal acupuncture, Carthami Flos herbal acupuncture is -0.09, 0.11, -0.07, 0.28, -0.11 and -0.09. Conclusion : We found the correlation of filtration rate of herbal-acupunctures and pain score of herbal-acupuncture stimulation. This study help to control pain amount and pain duration time of herbal acupuncture treatment. And this study improve acupuncture theory of herbal acupuncture.

• 한국패류학회지
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• 제21권1호
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• pp.19-24
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• 2005

This study was undertaken with the intent to describe the influence of water temperature and food concentration on the filtration rates of the Asiatic clam, Corbicula fluminea. The clams were collected at Lake Geumho near Yeongsan river, during March 2001. Food organism, Scenedesmus sp. (KMCC FC-34), was indoor-cultured in f/2 medium, and was used to measure the filtration rate of the clams. Filtration rate of the clams was measured by indirect method. Cell concentrations of food organisms were determined by direct counting cells using the hemacytometer under the light microscope. The filtration rate of the clams increased with water temperature up to circa $25^{\circ}C$. Above this temperature, the filtration rate decreased rapidly. The minimal filtration rate of the clams was recorded at $5^{\circ}C$. Thermal coefficient, $Q_10$ values at low temperature range were much higher than those at high temperature range. These results indicate the asiatic clam is more sensitive in cold water like most of marine bivalves. There was a strong reversed correlation between filtration rate and food concentration. Filtration rate of the clams was reduced as food concentration was increased.

• 한국지하수토양환경학회지:지하수토양환경
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• 제16권6호
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• pp.19-26
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• 2011

In this research, soil analysis and adsorption were conducted, and compared with the water quality of bank filtration and river in terms of TS, TDS, SS, $NH_4$-N, $NO_3$-N, $NO_2$-N, Fe, Mn, BOD and $KMnO_4$ consumption for the development of bank filtration in Gimhae city. Analysis of soil showed high levels of Fe (470 mg/kg), Mn (80 mg/kg) and $NH_4$-N (15 mg/kg). Also, adsorption coefficient values (k and 1/n) were 0.00159 and 0.8714, respectively. This implies that the adsorption of the soil depends on organic matter. Water qualitiy of the river and the bank filtration revealed that the concentrations of TS and TDS almost didn't change but the concentration of SS decreased 84% through the bank filtration. $NH_4$-N in the bank filtration was detected more than 1 mg/L which might be due to agricultural activities in the research area. $NO_3$-N was close to the detection limit owing to the removal by the adsorption. $KMnO_4$ consumption and BOD of the river were decreased by the bank filtration 250% and 350%, respectively, while Fe and Mn were significantly increased by the bank filtration.

• Environmental Engineering Research
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• 제7권3호
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• pp.137-148
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• 2002

• 지질공학
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• 제25권2호
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• pp.273-280
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• 2015

강변여과수의 수평집수정 시공시 불균질성 지층에 의한 굴착 지연 등은 전체 굴착 공정에 영향을 미칠 수 있다. 본 연구에서는 안성천 지역에서 시공 중인 수평집수정의 굴착 과정에서 심도별로 취득된 입도분석 자료, 균등계수, 곡률계수를 활용하여 실제 굴착 속도를 추정하는 방안을 제시하였다. 균등계수와 곡률계수를 입력인자로 사용한 회귀식을 도출한 후 타 수평집수정에 적용한 결과, 조립질이면서 분급이 양호한 지층에 추정식이 잘 맞는 것으로 나타났다. 본 연구 결과는 중소규모의 하천을 대상으로 개발된 만큼, 향후 대하천 주변의 굴착 정보를 활용하여 추정식을 보완한다면 보다 정확한 설계 및 효율적인 시공 관리가 가능할 것이다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제15권4호
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• pp.1-12
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• 2010

Well production by a riverbank filtration facility with multi-radial collector well systems in Jeungsan-ri, Changnyeong gun, Korea was evaluated. In this study, the drawdown at collector wells due to pumping and groundwater inflow rates along the horizontal arms of the collector wells were computed through numerical simulations. Sensitivities of the well production to hydraulic conductivity and well flow coefficient, which represents the resistance to the flow from the aquifer to the horizontal arms, were analyzed. Simulation results showed that, with given proposed pumping rate conditions, the drawdown in the caisson exceeded maximum drawdown constraints in the study site and the adjustment of the pumping rate at each well is needed. The drawdown is affected by the hydraulic conductivity of the main aquifer and the well flow coefficient, which means the profound field investigation of the study site is needed to accurately estimate the efficiency of riverbank filtration through radial collector wells.

• Membrane and Water Treatment
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• 제4권3호
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• pp.157-174
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• 2013

The present study is devoted to the validation of a new method for in line electrokinetic characterisation of deposits on membrane surfaces. This method is based upon simultaneous measurements of transversal streaming potential and permeates flux at constant pressure before and during the deposit formation. Dead-end filtration experiments were conducted with negative flat membranes forming a narrow slit channel, negative hollow fiber membranes and mono-dispersed suspensions of (negatively charged) polystyrene latex and (positively charged) melamine particles at various concentrations. It was observed that the overall streaming potential coefficient increased in absolute value with the deposited latex quantity, whereas it decreased and changed of sign during the filtration of melamine suspensions. By considering a resistance-in-series model, the streaming potential coefficient of the single deposit ($SP_d$) was deduced from the electrokinetic and hydraulic measurements. The independence of $SP_d$ with respect to growth kinetics validates the measurement method and the reliability of the proposed procedure for calculating $SP_d$. It was found that $SP_d$ levelled off much more quickly when filtration was performed through the slit channel. This different behaviour could result from a non-uniform distribution of the deposit thickness along the membrane given that the position of measuring electrodes is different between the two cells.

• 상하수도학회지
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• 제35권6호
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• pp.425-436
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• 2021

In this study, chemically enhanced steam cleaning(CESC) was applied as a novel and efficient method for the control of organic and inorganic fouling in ceramic membrane filtration. The constant filtration regression model and the resistance in series model(RISM) were used to investigate the membrane fouling mechanisms. For total filtration, the coefficient of determination(R²) with an approximate value of 1 was obtained in the intermediate blocking model which is considered as the dominant contamination mechanism. In addition, most of the coefficient values showed similar values and this means that the complex fouling was formed during the filtration period. In the RISM, R _c/R _f increased about 4.37 times in chemically enhanced steam cleaning compared to physical backwashing, which implies that the internal fouling resistance was converted to cake layer resistance, so that the membrane fouling hardly to be removed by physical backwashing could be efficiently removed by chemically enhanced steam cleaning. The results of flux recovery rate showed that high-temperature steam may loosen the structure of the membrane cake layer due to the increase in diffusivity and solubility of chemicals and finally enhance the cleaning effect. As a consequence, it is expected that chemically enhanced steam cleaning can drastically improve the efficiency of membrane filtration process when the characteristics of the foulant are identified.

• 대한토목학회논문집
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• 제3권3호
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• pp.1-7
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• 1983

지금까지 발표되어 있는 여과공정(濾過工程)의 수학적(數學的) 해석(解析)의 결과(結果)는 범용성(汎用性)이 없고 실용적(實用的)으로 이용(利用)될 수 없는 문제점(問題點)이 있었다. 그러나 여과공정(濾過工程)을 수학적(數學的)으로 표현(表現)하는 것은 장치설계상(裝置設計上) 대단히 중요하기 때문에 본논문(本論文)은 급속여과지(急速濾過池)의 여과공정(濾過工程)을 해명(解明)하기 위하여 여층내(濾層內)의 tracer study의 결과(結果)를 정리한 것이다. 따라서 여과공정(濾過工程)을 해명(解明)하기 위해서 최대(最大)의 문제점(問題點)으로 되어 있던 억류물비퇴적량(抑留物比堆積量)을 직접(直接) 파악(把握)하는 것에 의해 Kozeny-Carman 식(式)을 보정(補正)하여 실제에 활용(活用)될 수 있는 미소여층(微小濾層)의 여과지저항식(濾過紙抵抗式)을 유도(誘導)하였다. 또 조지율(阻止率)과 비퇴적량(比堆積量)과의 상관(相關) model을 제안(提案)하고 이것을 이용(利用)해서 여과방정식(濾過方程式)을 풀고 그 값을 유도(誘導)한 여과저항식(濾過抵抗式)에 대입(對入)하여 전여층(全濾層)의 여과저항(濾過抵抗)을 구(求)하고 그 결과(結果)를 도표화(圖表化)함으로서 여과저항식(濾過抵抗式)을 이론(理論)과 실용(實用) 양면(兩面)에 넓게 활용(活用)될 수 있도록 하였다.