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장길식 ( Gil Sik Jang ),김연희 ( Yun Hee Kim ),최영섭 ( Young Seop Choi ),김승호 ( Seung Ho Kim ),김종민 ( Jong Min Kim ),배석진 ( Seok Jin Bae ),조영관 ( Young Gwan Cho ),구태형 ( Tae Hyoung Koo ) 한국환경농학회 2016 한국환경농학회지 Vol.35 No.2
BACKGROUND: The objective of this study is to evaluate the soil quality to cultivate crops in urban garden. METHODS AND RESULTS: During the period of six month from March to August 2015, measured eight heavy metals, seven Organic items and Fluorine on seventeen urban sites and thirty-one suburban sites in Gwangju city. METHODS AND RESULTS: The average concentration and range of heavy metal in soil are 0.15 mg/kg(ND-0.6) for Cd, 14.9 mg/kg(1.5-33.3) for Cu, 4.4 mg/kg(0.4-71.8) for As, 0.05 mg/kg(ND-1.366) for Hg, 24.7 mg/kg(13.1-62.7) for Pb, 102.5 mg/kg(49.1-276.4) for Zn and 9.2 mg/kg(ND-90.1) for Ni but Cr6+ is not detected. The average value and range of soil fertility items are 253.5mg/kg(76.6-1766.0) for fluorine, 6.4(4.8-7.7) for pH, 20.3 g/kg(5.0-44.0) for orangic matters, 562.7 mg/kg (28.0-1672.0) for available phosphate, 0.6 cmol+/kg (0.1-2.3) for K, 9.7 cmol+/kg (2.7-22.0) for Ca, 3.0 cmol+/kg (0.9-7.4) for Mg, 1.0 ds/m(0.2-2.9) for conductivity. The concentration of Hg in Suburban area is 0.005 mg/kg lower than 0.134 mg/kg in urban area. Also, the concentration of As, Cd, Ni and Zn is lower than urban area as 32%, 37%, 51%, 71% respectively. CONCLUSION: According to SPI index of soil contamination, 39 sites are first degree and 8 sites are second degree and 1 site(41th) is fourth degree. Pb and Cd are not detected and As is detected tiny amounts in plants grown polluted soil, so heavy metals have not moved to plants.
제어 시스템 적용을 위한 ER유체의 빙햄 특성에 관한 기초적 연구
장성철,정영빈,장길식,Jang, Sung-Cheol,Jeong, Young-Bin,Jang, Gil-Sik 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.3
This paper describes the properties of temperature-viscosity characteristics of hydrous and anhydrous electro-rheological fluids containing starch and titanium particle in silicone oil ER effects arise from electrostatic forces between the starch particles and titanium particles dispersed to the electrically insulating silicone oil induced when electric field is applied ER fluids under electric field control have been found to provide resonable estimates of ER fluid viscosity variation characteristics. Yield shear stress of the ER fluids were measured the couette cell type rheometer as a function of electrlc fields. The outer cup is connected to positive electrode(+) and bob becomes ground(-). The electrie field is applied by high voltage DC power supply. In this experiment shear rates were increased from 0 to 200 $s^{-1}$ in 2 minutes. The ER fluid's viscosity change is very small and stable at the temperature range of $40^{\circ}C$ to $60^{\circ}C$. Therefore, applications of a new ER fluid to control systems application are suitable.
토지이용실태에 따른 하남산업단지 토양오염물질 분포 특성에 관한 연구
공화진,위환,김승호,박옥현,장길식,정희윤,배석진,정숙경,조영관,Kong, Hwa-jin,Wi, Whan,Kim, Seung-ho,Park, Ok-hyun,Jang, Gil-sik,Jung, Hee-yun,Bae, Seok-jin,Jeong, Suk-kyung,Cho, Young-gwan 한국지하수토양환경학회 2018 지하수토양환경 Vol.23 No.2
Soil contamination survey was conducted during March - July, 2017 to obtain soil contamination profile of 16 organic and inorganic contaminants in Hanam industrial complex located in Gwangju, Korea. The concentrations of all surveyed contaminants except Cd showed were within 0.3~1.5 times of their natural background levels. Cd showed concentrations as high as 6.9 times of the background level, signifying the influence of the metal processing facilities in the complex. The concentrations of Zn, Pb and Hg in areas nearby industrial facilities were 1.3~5.5 times higher than those within the facility and green area. The concentration of Cu in the green area was 1.4~2.9 times higher than in other areas. The Soil Pollution Index (SPI) analysis revealed 54% of the total area belong to first-grade soil, 43% to second-grade, and 3% to third-grade. The Enrichment Factor (EF) of Zn, Pb, and Cd were 9.2, 15.6, and 88.5, respectively, indicating high accumulation and contamination of the soil with Cd.
마을하수처리시설(BBF-DNS공법)에서 응집 및 질소처리공정 효율 향상에 관한 연구
박옥현 ( Ok-hyun Park ),위환 ( Hwan Wi ),김승호 ( Seung-ho Kim ),공화진 ( Wha-jin Kong ),장길식 ( Gil-sik Jang ),배석진 ( Seok-jin Bae ),조영관 ( Young-gwan Cho ),김은선 ( Eun-sun Kim ) 한국수처리학회 2017 한국수처리학회지 Vol.25 No.2
In this study, small-size rural sewage treatment facility with BBF-DNS method were diagnosed treatment efficiency and investigated how to improve facilities by process. The coagulant was added to the coagulating sedimentation tank by using a stream of influent water to which sewage was pumped as a raw solution. The biofilter tank continuously was injected oxygen through the oxygen feed pump and prevented the filter pores from being blocked by the influent. In the denitrification tank, the backwash plate was reinstalled to uniformly disperse air during the backwash and the number of backwash was increased to prevent re-contamination by the sediment. The BOD of the effluent before the facility improvement was 9.2 mg/L, COD of 16.4 mg/L, SS of 15.1 mg/L, T-N of 24.289 mg/L and T-P of 1.974 mg/L, respectively. After the facility improvement, effluent BOD was 3.7 mg/L, 97.2% of the treatment efficiency compared to the influent, COD was 11.6 mg/L, 80.5%, SS was 7.2 mg/L, 95.4%, T-N 8.258 mg/L was 75.5% and T-P was 1.013 mg/L, 76.9% and all items met the effluent quality standards of the public sewage treatment facility. The nitrification rate was 32.4% and the denitrification rate was 41.1% before the facility improvement, but were improved to 76.9% and 86.2%, respectively.