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RISS 인기검색어
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- 저자 : 김석구(Seog Gu Kim) (검색결과 5 건)
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김석구 ( Kim Seog Gu ),정장식 ( Jeong Jang Sig ),곽필재 ( Gwag Pil Jae ),최준향 ( Choe Jun Hyang ),이현동 ( Lee Hyeon Dong ),이태윤 ( Lee Tae Yun ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.2
Feasibility of using PE sheet laminated CSP(Corrugated steel pipe) to sewers were tested via corrosion and abrasion tests for PE sheet laminated CSP; 1) corrosion test for PE film and PE coated plate, 2) corrosion test for joint of PE sheet laminated CSP, 3) corrosion test for outside of PE sheet laminated CSP, and 4) abrasion test for inside of PE sheet laminated CSP. The results for the corrosion and abrasion tests are as follows. 1. Results for corrosion tests on PE films and zinc coated steel plates that were coated with PE films show that the surfaces of both PE were not changed compared to those of original PE samples. Furthermore, PE films maintained strong adhesion on the steel plates even though they were exposed to sewage and seawater provided cutting planes of the steel plates were treated with molding. But, results for corrosion tests on the spots that were previously cut off by a knife and a cutting planes of the steel plates were treated without molding show that steel plates have been corroded if they were exposed to sewage and seawater. 2. Results for corrosion tests on joints of PE sheet laminated corrugated steel using sewage show that gathering rust was observed at cutting plane of PE sheet laminated corrugated steel after 180 days, but PE film was not flaked off. However, PE film at cutting plane was flaked off when PE sheet laminated corrugated steel was exposed to seawater. Furthermore, flaking process was severely progressed at lockseam points of which the surfaces were not smooth. 3. Results for laying PE sheet laminated corrugated steel under the ground show that the surface of untouched PE film was almost identical to that of original PE film. However, the spots that were previously cut off by a knife and a cutting plane of PE sheet laminated corrugated steel have flaked off. 4. As a result of abrasion tests conducted with PE sheet laminated corrugated steel and sand, brilliance and thickness of PE was not greatly changed under the severe abrasion conditions. Therefore, the durability of PE sheet laminated corrugated steel for abrasion was determined to be good.
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김석구 ( Seog Gu Kim ),윤상린 ( Sang Leen Yun ),김영임 ( Young Im Kim ),이용재 ( Yong Jae Lee ),김이호 ( Ree Ho Kim ),김종오 ( Jong Oh Kim ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.5
While more attention has been paid in recent years to urban point source pollution control, no considerable measures have been taken to control urban non-point source pollution. Contaminants from non-point sources deposited on urban impermeable surfaces such as road and highway are easily released to the public waters by rainfall, leading to the deterioration in water quality in urban area. The present study investigated a system using filter media to reduce the level of contamination in urban road runoff. Three different media, designated as J-P (polypropylene, blowing type), B-P (polypropylene, fiber type), and P-F (Polyvinyl alcohol, cube and sheet type) were evaluated on the basis of pollutant removal efficiency as well as hydraulic property. Experiments were peformed using a 1/4-scale treatment unit at various pollutant roading and rainfall intensity with real rainwater runoff collected from road surfaces. The results at different rainfall intensities shows that the medium J-P is superior to the other media for water permeability. J-P was not blocked at 10 ㎜/hr rainfall and its permeability was stable. On the other hand, B-P and P-F resulted in substantial overflow ratio even at l ㎜/hr rainfall intensity. Comparing treatment efficiencies for suspended solids, all media showed similar removal ranged from 91% to 95%. However, J-P seems to be better than the other media considering its higher water permeability. J-P and P-F, both hydrophobic, yielded over 76% of heavy metal removal. But, the hydrophilic media B-P showed much smaller removal ranging from 26% to 47%. This indicates that J-P and P-F are beneficial to remove heavy metal due to their hydrophobic property. The treatment efficiencies over PAHs (poly aromatic hydrocarbons) showed the similar removal efficiency ranging from 66% to 97% for all three media.
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혐기성 분리막을 이용한 액상 슬러지로부터의 용해성 저급 지방산의 회수
김종오 ( Kim Jong O ),김석구 ( Kim Seog Gu ),김이호 ( Kim I Ho ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.2
The performance of a membrane-coupled anaerobic fermenter system for the recovery of volatile fatty acids (WAS) from liquid organic sludge was experimentally investigated. Permeation flux was stably kept around 0.2 (㎥/㎡/day) during operational period. The membrane-coupled fermenter showed 2.2 times higher VFAs concentration and higher VFAs forming rate than those of fermenter without membrane. The fermenter with membrane proved to be an effective system for the recovery of soluble organic materials from liquid sludge.
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실험실 규모의 음향정재파를 이용한 수중의 입자분리 특성
안재환(Jae Hwan Ahn),강성원(Sung Won Kang),안광호(Kwang Ho Ahn),김이태(I Tae Kim),김석구(Seog Gu Kim),안호상(Ho Sang Ahn),이영섭(Young Sup Lee) 大韓環境工學會 2012 대한환경공학회지 Vol.34 No.12
실험실 규모의 음향정재파 장치를 이용하여 수체에 포함된 입자의 분리특성을 알아보았다. 음향정재파는 음파 또는 초음파와 유사한 파장으로 반사벽에 의해 발생된 파가 돌아오면서 일정한 파장을 형성한다. 이때 수중에 분산되어 있던 미세한 입자들은 음압이 0인 파장의 절점(node) 부분에 모이게 된다. 주파수 28.0kHz와 1.0MHz의 음향정재파 트랜스듀서를 이용 하였고, 수체에 포함된 입자는 평균 입경 6.8μm의 카올린과 100.5μm의 레드머드를 사용하였다. 수체 내에 음향정재파가 형성되면 발생된 파장에 의한 음압으로 수온이 0.15∼0.20℃/min 정도 상승된다. 카올린과 레드머드의 초기 농도는 0.1, 0.2, 0.3, 0.4, 0.5g/L로 동일하게 제조하였다. 1.0MHz의 주파수에서 5분경과 후 음향정재파가 가장 뚜렷하게 형성되었을 때의 반응조내의 탁도 제거율은 카올린은 18.2%∼56.2%로, 입경이 큰 레드머드는 23.0%∼53.6%의 분리효율을 나타내었다. 28.0kHz 주파수에서는 입자분리가 이루어지지 않았다. Characteristics of particle separation in water using labscale acoustic standing wave were studied. Acoustic standing wave is similar to either sound wave or ultrasonic, which makes a constant wave while returning to the origin by reflector. During that time, particulates dispersed in water are collected on the node of wave, where a sound pressure is zero. Acoustic standing wave transducer as of 28.0kHz and 1.0MHz were utilized and 6.8μm kaolin and 100.5μm redmud in average diameter were used as experimental materials in water. Once acoustic standing wave are generated in water, water temperature rises by 0.15∼0.20℃/min due to a sound pressure. Initial concentration of kaolin and redmud were controlled to have same as of 0.1, 0.2, 0.3, 0.4, 0.5g/L, respectively. Removal efficiency of the turbidity in a reacting chamber after 5 minutes, when acoustic sound wave was formed in most distinct, was measured to have 18.2∼56.2% for kaolin and 23.0∼53.6% for redmud at 1.0MHz. Particle separation was not observed at 28.0 kHz.
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