영양제로서 결정 NH₄H₂PO₄를 첨가한 피혁 공장 폐수의 생물학적 처리

전명순,임병란,최기덕,이수구 서울산업대학교 산업대학원 1993 大學院論文集 Vol.2 No.-

피혁 공장 폐수의 생물학적 처리에 있어서 유입 폐수의 급격한 부하변동, 독성물질의 유입 및 미생물의 성장에 필요한 각종 영양소의 불균형 등으로 인해 처리효율이 낮고 운전관리상 어려움이 많다. 따라서 본 연구에서는 피혁공장 폐수의 생물학적처리효율을 높이기 위하여 각종 영양제의 주입에 따른 처리효과에 관한 실험을 실시하여 적절한 영양제를 선정하고, 최적 주입량 등을 결정 하였다. 실험대상 폐수는 반월공단내의 피혁 공단 폐수로서 중화 및 응집참전 밥법으로 전처리 한 후 포기조에 유입되는 폐수를 대상으로 하였다. 영양제로는 회분식 실험에서 피혁폐수의 처리효율이 가장 우수한 것으로 나타난 결정 APM (ammonium phosphate monobasic, NH₄H₂PO₄)을 이용하였다. 연속식 활성 슬러지 공장에 있어서 폐수의 유량, 슬러지 반송율, 결정 APM 주입량 등을 변화시켜 그에 따른 처리효율에 미치는 영향을 실험 고찰하였으며, 생물 반응공학적인 반응해석을 통하여 설계에 필요한 반응상수 등을 구하였다. 연속식 활성슬러지법에서체류시간 12시간의 조건에서 영양제 미주입시 BOD 제거효율은 68%에 불과하였으나, 영양제로서 요소와 인산을 주입한 경우 73%로 증가하였으며 결정APM을 주입한 경우 90% 이상의 높은 처리율을 얻을 수 있었다. 결정 APM의 최적 주입량은 회분식 실험의 경우 300㎎/L이었으나, 연속식 실험의 경우 50㎎/L로 낮게 나타났는데, 이는 반송되는 슬러지내의 높은 인농도와 미량원소에 기인한다. 결정 APM을 50㎎/L 주입한 후 수리학적 체류시간을 6∼30 시간의 범위로 변화시켜 실험한 결과, BOD 제거효율은 체류시간 6시간에서는 67%에 불과하였으나, 12시간의 경우 93%, 30시간의 경우 98%이었다. 따라서 BOD제거효율 90%이상을 얻기 위해서는 수리학적 체류시간은 11시간 이상, F/M비는 0,65 ㎏ BOD/㎏ MLVSS·d 이하로 운전하여야 하는 것으로 나타났다. This study was performed to enhance the treatment efficiency of leather wastewater adding APM(ammonium phosphate monobasic, NH₄H₂PO₄) crystal as nutrient which contained the sufficient mineral components. The effect of APM crystal on biological treatment were studied and its optimum dosage and kinetic coefficients were determined. In the continuous activated sludge system for field wastewater of Banwol leather complex, BOD removal efficiency could be obtained over 90% with adding APM crystal, while it was 68% without nutrients and 73% with urea and phosphoric acid in the condition of HRT 12hr and SRT 3 days. The optimum dosage of APM crystal was 50㎎/L which was low compared with 300㎎/L in batch test due to recycling sludge contained high content of phosphate and mineral nutrients. In the condition of adding APM crystal 50㎎/L and hydraulic retention time in the range 6∼30hr, BOD removal efficiencies were 67% for HRT 6hr, 93% for 12hr and 98% for 30hr. In order to obtain over 90% of BOD removal efficiency, HRT should be maintained over 11 hr and F/M ratio within 0.65 ㎏ BOD/㎏ MLVSS·d.

초임계유체와 염을 이용한 에탄올농축에 관한 연구(1) : CO2 - C2H5OH 계와 CO2 - H2O 계의 고압기액평형 High Pressure Vapor - Liquid Equilibria for Co2 - C2H5OH and CO2 - H2O Systems

전해수,이윤용,김재덕,임종성,조정식,박선근 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.1

기상과 액상 모두를 계속해서 순환시키는 상평형실험장치(circulation type)를 이용하여, CO₂-C₂H_5OH계에 대한 고압기액상평형실험을 313.2 K, 323.2 K, 333.2 K에서 압력 (약 5 ㎫-혼합물의 임계압력부근)을 변화시키면서 수행하였다. 각각의 온도에 대한 혼합물의 임계압력은 8.1㎫, 9.3㎫, 10.6㎫ 정도로서 온도가 증가할수록 혼합물의 임계압력이 증가하는 것을 알 수 있었다. 또 CO₂-C₂H_5OH 및 CO₂-H₂O계의 고압상평형자료를 Adachi와 Sugie의 혼합법칙을 사용한 Patel-Teja의 3차상태방정식에 적용하여 상관시켜 본 결과 만족할 만한 상관결과를 얻었다. High pressure vapor-liquid equilibria for CO₂-C₂H_5OH system were measured at three temperatures of 313.2 K, 323.2 K and 333.2 K using a circulation type of apparatus in which both vapor and liquid phase were continuously recirculated over a pressure range from ca. 5 ㎫ up to near mixture critical point. The critical pressures of the mixtures were about 8.1 ㎫, 9.3 ㎫ and 10.6 ㎫ at the three temperatures, respectively. This result shows that the temperature increases with the critical pressure of the mixture. The high pressure vapor-liquid equilibrium data for CO₂-C₂H_5OH and CO₂-H₂O systems were satisfactorily correlated by applying the Patel-Teja equation of state with the Adachi-Sugie mixing rule.

Improved Micropropagation of Root Chicory, Cichorium intybus L. var. sativus.

Lim,Jung-Dae,Yang,Deok-Chun,Lee,Hyeon-Yong,Kim,Jong-Dai,Lee,Jin-Ha,Sung,Eun-Soo,Yu Chang-Yeon 한국자원식물학회 2004 Plant Resources Vol.7 No.1

The establishment of an efficient protocol for plant regeneration and micropropagation from leaf explant cultures of Chicory, Cichorium intybus L. var. sativus. is reported. Callus formation rate appeared 100% from explant in all growth regulators, but calli formed in the prensence of naphthaleneacetic acid (NAA) were appeared very compact and non-embryogenic state. The regenerated shoots were obtained from leaf explant cultures on solid MS medium containing different concentrations of cytokinins and auxin. The highest number of shoots (5.7) per explant and shoot growth (2.8cm) was obtained on MS medium containing 0.1 mg BAP L^-1 and 0.1 mg NAA L^-1. Indole acetic acid was the most suitable auxin for root formation among three auxins tested. 2,4-D had no effect on shoot and root formation.

여름철 참나무속의 이소프렌 배출속도 비교에 관한 연구

김조천,김기준,홍지형,선우 영,임수길 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.1

In order to compare the NVOC (Natural Volatile Organic Compound) emission rates from oak trees, the emission rates of isoprene were quantitatively measured in situ based on tree species and region. As a result, the emission rates from Quercus serrata T. were found to be 1000 times greater than those from Quercus acutissima C. However, the emission rates at the Chiri and Gumsung mountain sites did not show any significant differences in summer. Cuvette tests using four different oak species also supported that there was a tremendous difference in emission rates between Quercus serrata T. and Quercus acutissima C. It was found that the emission rates from the trees were highest on the order of Quercus serrata T., Quercus aliena B., Quercus acutissima C. and Quercus variabilis B.

대퇴 골두 골내 결절종 : 증례 보고 A Case Report

임수재,천동일,우승한,임강철,박종석,이병일 대한고관절학회 2004 Hip and Pelvis Vol.16 No.1

하악 피질골과 연조직의 해부학적 두께를 위한 정량적 평가

이수경,임원희,전윤식 대한치과교정학회 2007 대한치과교정학회지 Vol.37 No.3

일정축력 및 반복 횡하중을 받는 철골철근콘크리트 기둥의 내력과 변형성능

정수영,연길환,임경택,윤석천,한병찬 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2

An experimental investigation was conducted to investigate the strength and deformation capacity of Wide Flange Steel Encased Reinforced Concrete(SRC) Columns subjected to constant axial compression and cyclic lateral loading conditions. Six one-third scale specimens were tested, each consisting of a structural steel size encased in reinforced concrete. The parameters studied in the test program included the effects of B/t ratios of encased steel(=13, 18, 23), ratios of axial force(=1/3, 1/6). As a result, capacity prediction based on superimposing the moment-axial-load interaction surfaces of the steel shape and reinforced concrete produced good results; the average of the experimental-to-predicted capacity ratio being equal to 0.99∼1.20. The observed hysteretic behavior of the test specimens indicated that adequated ductility can be achieved and the concrete core must be inhibited to buckling of wide flange.

조명광원의 색온도와 조도 및 스펙트럼 측정

최대욱,박성진,임춘우,석성수,오철한 慶北大學校 師範大學 科學敎育硏究所 1999 科學敎育硏究誌 Vol.23 No.-

The peak wavelength and temperatures of W-Halogen standard light source were measured by using the modified Wien's Law. In the case of graybody, the emissivity ε should be taken into account in using the Wien's Law. In the experiment, PDA spectroscope was used for the measurement of peak wavelength of intensity distribution of spectrum. As the current of light source increases from 5A to 7.4A, the peak wavelength of intensity distribution of the spectrum decreased from 717nm to 690nm, and temperature increased from 3127K to 3330K. Illuminations of three-wavelength lamps and light source were also measured. It was found that irradiation spectrum of those three-wavelength lamps are not coincident to blue(450nm), green(550nm) and red(610nm).

Editorial : Cytokine gene polymorphisms: Can these differentiate renal disease entities?

( Chun Soo Lim ) 대한신장학회 2012 Kidney Research and Clinical Practice Vol.31 No.4

The Association of Rate of Weight Gain During Early Adulthood With the Prevalence of Subclinical Coronary Artery Disease in Recently Diagnosed Type 2 Diabetes: The MAXWEL-CAD Study

Lim, Soo,Choi, Sung Hee,Kim, Kyoung Min,Choi, Sang Il,Chun, Eun Ju,Kim, Min Joo,Park, Kyong Soo,Jang, Hak Chul,Sattar, Naveed American Diabetes Association 2014 Diabetes care Vol.37 No.9

<P><B>OBJECTIVE</B></P><P>To investigate the association of the rate of weight gain (Rate<SUB>max_wt</SUB>) between the age of 20 years and the age of maximum lifetime weight gain with indicators of subclinical coronary artery disease (CAD) at the time of diagnosis of type 2 diabetes (T2D).</P><P><B>RESEARCH DESIGN AND METHODS</B></P><P>We studied 1,724 consecutive Korean subjects aged ≥30 years with recently diagnosed (within 3 months) T2D and one or more cardiovascular risk factors to investigate the association of Rate<SUB>max_wt</SUB> with subclinical CAD. We used 64-slice cardiac computed tomography angiography to evaluate the degree of coronary artery stenosis, multivessel involvement, plaque characteristics, and coronary artery calcium score (CACS). Body weight at age 20 years (Wt<SUB>20y</SUB>) was obtained from participant records. Participants recalled their maximum weight (Wt<SUB>max</SUB>) before T2D diagnosis and age at maximum weight (Age<SUB>max_wt</SUB>). The Rate<SUB>max_wt</SUB> was calculated as (Wt<SUB>max</SUB> – Wt<SUB>20y</SUB>) / (Age<SUB>max_wt</SUB> – 20 years).</P><P><B>RESULTS</B></P><P>The prevalence of coronary artery stenosis (≥50%), multivessel involvement (two or more vessels), plaque characteristics, and CACS ≥100 were 11.4%, 6.6%, 19.7%, and 12.8%, respectively. Mean Wt<SUB>20y</SUB> and Wt<SUB>max</SUB> were 60.1 ± 10.5 and 73.0 ± 11.5 kg, respectively. Mean Age<SUB>max_wt</SUB> was 41.3 ± 10.7 years, and Rate<SUB>max_wt</SUB> was 0.59 ± 0.56 kg/year. After adjusting for cardiovascular risk factors, including current BMI, the highest quarter of prior weight gain was significantly associated with coronary artery stenosis, multivessel involvement, and plaque characteristics, particularly mixed and noncalcified plaque.</P><P><B>CONCLUSIONS</B></P><P>The findings suggest that a greater rate of prior weight gain may accelerate the development of subclinical vascular complications in patients with newly diagnosed T2D.</P>