• Title/Summary/Keyword: 미세기포

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An Effect of the Micro Bubble Formation Depending on the Saturator and the Nozzle in the Dissolved Air Flotation System (DAF 공정에서 공기포화장치와 노즐 특성 별 미세기포 발생에 미치는 영향)

  • Park, S.C.;Oh, H.Y.;Chung, M.K.;Song, S.L.;Ahn, Y.H.
    • Journal of Korean Society of Environmental Engineers
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    • v.35 no.12
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    • pp.929-936
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    • 2013
  • The saturator and injection nozzle are important facilities on the dissolved air flotation process. To increase the formation of micro bubble, it is required to improve the air dissolving performance in the saturator and keep the pressure uniform from the saturator to the nozzle. This study aimed to evaluate the performance of the saturator and the hydraulic effect of the nozzle and the pipe structure. The air volume concentration, bubble size and bubble residual time were measured in the test. The saturator, which had mounted with the spray nozzle, showed a good performance for bubble formation. Also, the characteristics of micro bubble formation were influenced by pressure uniformity and flow velocity through the orifice in the nozzle.

A Study on the Cleanup of Diesel-Contaminated Soil by Micro-Bubble Soil Washing Process (미세기포를 이용한 토양세척기법의 디젤 오염토양 정화에 관한 연구)

  • 조장환;정민정;민경석;최상일
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 1999.04a
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    • pp.97-99
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    • 1999
  • 본 연구에서는 디젤로 오염된 토양을 효율적으로 정화하기 위해, 알칼리제와 과산화수소를 이용하는 새로운 방식의 토양세척기법에 대하여 일련의 회분식 실험을 통하여 최적의 운전조건을 검토하고자 하였다. 알칼리제인 NaOH를 이용하여 세척수의 pH를 상승시켜, 강알칼리 상태에서 과산화수소를 주입하면 미세기포가 발생되며, 이 미세기포에 의해 토양에 흡착되어 있는 유류 오염물질이 효과적으로 탈착.부상된다. #60(0.25mm) 이하의 자연토양을 6,500 mg TPH/kg dry soil로 오염시켜 사용하였으며, 세척수의 pH, 진탕비(토양 중량 : 세척용액 부피), 과산화수소 주입량, 세척시간에 의한 영향을 살펴보았다. 세척수의 pH는 12, 진탕비는 1:5, 과산화수소 주입량은 1%, 세척시간은 1시간으로 적용한 결과 최대효율(60%)을 얻을 수 있었다.

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Removal of calcium chloride in road structure using ultra-fine bubble washing machine (미세기포 세척장비를 이용한 도로시설물 염화칼슘의 제거)

  • Park, Gun-Il;Lee, June-Hyung;Park, Hyung-Jun;Kim, Hyun-Jin;Kim, Heung-Rae;Cho, Il Hyoung
    • Journal of the Korean Applied Science and Technology
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    • v.36 no.4
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    • pp.1281-1289
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    • 2019
  • This study was conducted to evaluate the optimal operating condition of ultra-fine bubble washing machine for removing calcium chloride from road concrete structure. The diameter of the ultra-fine bubble was measured to 196.6 ± 100.6 nm and the ultra-fine bubble concentration was measured to 1.36 × 108 cell/ml. As a result of the performance on the spray device of the washing machine, it was confirmed that the washing efficiency of 93% and 91% appeared at 100cm and 150cm of injection distance at 100bar injection pressure. By increasing the ultra-fine bubble generation cycles from 2 to 6, the chloride removal rate increased from 1% to 7%. As the ultra-fine bubble generation air flow was lowered from 4 ml/min to 0.5 ml/min, it was confirmed that the washing efficiency increased up to 30%. The washing efficiency of ultra-fine bubble water was 25% higher than normal water.

Study on Phosphorus Removal in the Secondary Effluent by Flotation Using Microbubble Liquid Film System (미세기포 액막화 부상법을 이용한 하수 2차 처리수의 인 제거에 관한 연구)

  • Lee, Shun-Hwa;Kang, Hyun-Woo;Lee, Se-Han;Kwon, Jin-Ha;Jung, Kye-Joo
    • Journal of Korean Society of Environmental Engineers
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    • v.34 no.1
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    • pp.42-48
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    • 2012
  • In this study, experiment on phosphorus removal was performed by using microbubble liquid film flotation tank with microbubble module. After dissolving gas and liquid in dissolving tank, microbubble liquid film system created microbubbles in equal size under fixed low pressure. After being passed through $A_2O$ and m-$O_3$ process, secondary treatment wastewater was used as influent in phosphorus removal process. When the T-P concentration of influent was 2.89 mg/L, alum(8%, 30 mg/L) was injected into a microbubble flotation tank, the treatment resulted 94% of T-P removal rate. Remaining T-P concentration was less than 0.2 mg/L, which is in accord with the effluent quality standard. Seasonal variations in water temperature showed no differences in T-P removal property. When the inflow concentration of SS was 1.0 mg/L or more, it served as coagulation nuclei in the coagulation process. In that condition, average T-P removal rate was higher than 97%. When 50% of floated scum was returned, coagulator Al included in scum assisted the injected coagulator and maximized the coagulation efficiency of pollutant. In such treatment, the T-P concentration was measured as 0.18 mg/L and satisfied the outflow water quality standard, which is 0.2 mg/L or less.

Thickening of Activated Sludge Using Low Pressure Flotation Pilot System (파일롯 규모의 저압형 부상장치를 이용한 하수슬러지 농축에 관한 연구)

  • Kim, Ji Tae;Oh, Joon Taek;Kim, Jong Kuk
    • Journal of Korean Society of Environmental Engineers
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    • v.36 no.3
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    • pp.172-177
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    • 2014
  • Low pressure air flotation (LAF) pilot plant for sludge thickening was installed in Chung Nam N.S. municipal waste water treatment plant to verify its application possibility. Effects of operating conditions such as coagulant dosages and microbubble water ratio on thickening of the mixed sludge were examined. Microbubbles which were generated in the chamber of $1.5kgf/cm^2$ by high speed collision method with foaming agent were used to float sludge. Solid loading of $30kg/m^2/hr$, solid contents in thickened sludge of 60,300 mg/L and SS removal efficiency of 99% were obtained through long period operating LAF in conditions of mixed sludge concentration of 14,400 mg/L, coagulant dosage of 27.6 mg/L, foaming agent addition of 4.0 mg/L and microbubble water injection ratio of 9.7%.

The Effect of Environmental Fine Bubble on the Production of Ginsenoside during the Growth Period of Ginseng Cultivation (인삼 재배시 생육기간 동안 환경적 요인인 미세기포수가 ginsenoside 생성에 미치는 영향)

  • Ahn, Chul-Hyun
    • Journal of the Korea Convergence Society
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    • v.8 no.12
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    • pp.1-7
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    • 2017
  • This study was conducted to investigate changes in ginsenoside by continuously treating fine bubble, which are mainly used for environmental purification, in 2-year-old ginseng. The ginsenoside content and composition of ginseng leaves and roots were analyzed for 4 months (120 days) after application of Fine bubble. As a result of treatment with common water in leaves, only Re of protopanaxatriol was significantly higher and As a result of treatment with fine buble, it was confirmed that protopanaxadiol Rb1, RC, Rb2 and Rd components were also increased. Especially, the increase of Re and Rb1 resulted in an increase of total ginsenoside. The ratio of PD / PT to ginseng was 0.811 in finebubble treated leaves and 1.28 in root. The fine bubble treatment induced the synthesis of ginsenoside from the roots and resulted in a PD / PT ratio of close to 1. Therefore, this study suggests a method of cultivating high quality ginseng using fine bubble water and suggests possibility of using it as a functional food material which can be used with leaves as well as roots.

Modeling of Scattered Signal from Ship Wake and Experimental Verification (항적 산란신호의 모델링과 실험적 검증)

  • Ji, Yoon-Hee;Lee, Jae-Hoon;Kim, Jea-Soo;Kim, Jung-Hae;Kim, Woo-Shik;Choi, Sang-Moon
    • The Journal of the Acoustical Society of Korea
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    • v.28 no.1
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    • pp.10-18
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    • 2009
  • A moving surface vessel generates a ship wake which contains a cloud of micro-bubbles with radii ranging between $8{\sim}200{\mu}m$. Such micro-bubbles can be detected by active sonar system for more than ten minutes depending on the size and speed of the surface vessel. In this paper, a reverberation model for the ship wake is presented. The developed model consists of the acoustic scattering model due to the distribution of the micro-bubbles and the kinematic model for the moving active sonar. The acoustic scattering model is based on the volume integration, where the volume scattering strengths are obtained from the spatial distribution of micro-bubbles. Since the directivity and look-direction of active sonar are important factors for moving active sonar, the kinematic model utilizes the Euler transformation to obtain the relative motion between the global and local coordinates. In order to verify the developed model, a series of sea experiment was executed in September 2007 to obtain the spatial-temporal distribution of a bubble cloud, and analyzed to be compared with the simulation results.

A Study on the Cleanup fur Diesel-Contaminated Soil by Micro-Bubble Enhanced Soil Washing Process (미세기포를 이용한 토양세척기법의 디젤 오염토양 정화에 관한 연구)

  • 조장환;장윤영;최상일
    • Journal of Korea Soil Environment Society
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    • v.4 no.1
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    • pp.49-55
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    • 1999
  • The treatment of petroleum contaminated soil requires various physico-chemical remediation technologies which are efficient in time and can reduce the possibility of secondary contamination by themselves In this study, an innovated soil washing process was proposed to treat the diesel-contaminated soil. Micro-bubbles, which were generated by hydrogen peroxide, deserted and floated the contaminants. Soils less than #60(0.25mm) were artificially contaminated by 6,500mg TPH/kg dry soil initially. The process was examined for pH, the soil to water mixing ratio, concentration of $H_2O$$_2$, and contacting times. In the case of less than #60 soil, maximum removal efficiency(60%) was obtained at pH 12. 1.0% hydrogen peroxide, and 1 : 5 soil to water mixing ratio for 1 hour.

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A Compact Air Compressor Development of Reciprocating Type (왕복동식 소형 공기압축기 개발)

  • Kang, Ki-Joong;Lee, Kee-Man
    • Proceedings of the KAIS Fall Conference
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    • 2010.11b
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    • pp.542-545
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    • 2010
  • 통상 분 당 $0.6{\ell}$, 최대 $2{\ell}$의 유량과 토출 압력 5atg의 운전 조건을 만족시키는 미세기포발생기용 소형 왕복동식 공기압축기를 개발하는 것이 본 연구의 목적이다. 미세기포발생기는 현재 농업, 어업, 미용, 수질오염방지 등 여러 방면에서 매우 널리 사용되고 있는데, 이러한 미세 기포를 발생시키기 위해서는 고압의 소형 공기압축기가 요구 된다. 이를 위해 비교적 간단한 구동방식의 왕복동식 압축방법을 선정하여 핵심 설계 항목인 실린더와 피스톤형상, 간극체적, 압축비, 구동모터 출력을 이론적 예측과 실험적 방법을 통하여 최적화하였다. 그 결과 미세기포 발생장치 시스템에서 가장 큰 공간을 차지하고 있는 압축기를 소형화시켰으며 압축기 개발 목표 성능을 달성하였다.

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Conical Diffuser Design and Hydraulic Performance Characteristics in Bioreactor Using Empirical and Numerical Methods (원뿔형 산기관 설계와 생물반응조에서 수력학적 운전특성에 관한 실험 및 해석)

  • Lee, Seung-Jin;Ko, Kyeong-Han;Ko, Myeong-Han;Yang, Jae-Kyeong;Kim, Yong-Guk
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.39 no.8
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    • pp.633-643
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    • 2015
  • In this study, we develop a highly efficient conical-air diffuser that generates fine bubble. By inserting a sufficient number of aerotropic microorganisms with dissolved oxygen from an air diffuser and minimizing the air-channel blockages within the air diffuser, we expect to improve the efficiency and durability of the decomposition process for organic waste. To upgrade the conventional air diffuser, we perform experiments and numerical analysis to develop a conical-type that generates fine bubble, and which is free from nozzle blockage. We complement the air-diffuser design by numerically analyzing the internal air-flow pattern within the diffuser. Then, by applying the diffuser to a mockup bioreactor, we experimentally and numerically study the bubble behavior observed in the diffuser and the 2-phase fluid flow in the bioreactor. The results obtained include statistics of the cord length and increased velocity, and we investigate the mechanisms of the fluid-flow characteristics including bubble clouds. Throughout the study, we systemize the design procedures for the design of efficient air diffusers, and we visualize the fluid-flow patterns caused by bubble generation within the mockup bioreactor. These results will provide a meaningful basis for further study as well as the detection of oxygen transfer and fluid-flow characteristics in real-scale bio-reactors using sets of air diffusers.