마그네트론 양극의 온간성형 공정의 UBET해석

조관형,배원병,김영호,양동열 한국정밀공학회 1995 한국정밀공학회 학술발표대회 논문집 Vol.1995 No.5월

기질유도 질소성분의 이용

조관형,조영태 대한환경공학회 1998 대한환경공학회 학술발표논문집 Vol.1998 No.12

부착조류와 유기오탁지수에 의한 소하천의 수질평가

조관형,Jo, Kwan-Hyung 한국환경보건학회 2010 한국환경보건학회지 Vol.36 No.2

In this study, a method for river water quality evaluation by algal examination was investigated. For development of this method, algae living in small rural streams in Gwangcheon-Cheon were collected and observed by microscope. Samples were collected at six stations from May 2008 to May 2009. To elucidate the relationship between pollution and the algal species, diatom grasps were collected from the streams and used to determine the water quality grade. The numerical EC value was compared with the value of DAIpo (Diatom Assemblage Index of Organic Water Pollution), and the results showed a tendency to a mutually inverse relationship. Further, the numerical BOD and COD values were compared to the DAIpo value. The results showed that, various diatoms reside in Gwangcheon-Cheon, and water quality was found to be second-grade at all the examined points. These results indicate pollution of streams by livestock wastewater; however continuous monitoring will be necessary to more definitely determine the reason for the Gwangcheon-Cheon pollution.

회원작품 - Enlluné _ '섬, 바람 그리고 달빛이 머무는 집'

조관형,Cho, Kwanhyeong 대한건축사협회 2020 建築士 Vol.618 No.-

연속류형 회분식미생물막반응조에서의 동력학 상수 도출

조관형,박덕원 청운대학교 건설환경연구소 2011 청운대학교 건설환경연구소 논문집 Vol.6 No.2

Biodegradability of synthetic sewage was investigated using fixed biomedia which had been adapted to mineralize sewage. It has been suggested that biomedia characteristics may be important in mitigating effects of sewage concentration. After acclimation of the biomedia to synthetic sewage, the biodegradability of sewage at different concentration was investigated, over a COD range of 82 to 168 mg/L and BOD range of 152 to 348 mg/L. As dissolved oxygen and retention times increased, removal efficiency of organic, nitrogenous and phosphorus compounds was increased. When dissolved oxygen was 6~7 ppm and retention time was 15hr, BOD, COD, SS removal efficiency of SBBR process were almost 92%, and T-N, T-P removal efficiency were 56%, 71%, respectively. Data from the biodegradation experiments were analyzed by a nonlinear regression program, LMFIT, that minimizes the least square of difference between data and various model curves. Kinetic analyses of SBBR process using Michaelis-Menten model, logistic growth model, exponential growth model and first order model were done at an initial COD concentration of 120 mg/L. The exponential growth model was the best represented SBBR process 본 연구에서는 미생물 담체를 사용하는 연속류형 회분식미생물막반응조(SBBR)를 적용하는 하수처리장 설계에 매우 중요한 인자인 동력학적 상수를 다양한 방법으로 추정하였다. 주요 수질항목별 제거율을 조사한 결과, 유입수의 CODMn는 평균 113 mg/L이었고 BOD 평균값은 205 mg/L로 조사되었으며, CODMn의 평균 유출농도는 9.2 mg/L로 제거율은 91.7 %로 나타났고, BOD는 평균유출농도가 17 mg/L로서 제거율이 약 91.8 %를 보이고 있다. 또한 SBBR의 유입수의 질소와 인의 농도는 각각 13.97 mg/L와 2.42 mg/L이나 반응이 완료된 후의 처리수의 질소와 인의 농도는 각각 6.12와 0.78 mg/L로 각각 약 56.2%와 71.1%의 처리율을 나타내고 있어 질소와 인의 전처리 공정으로도 사용될 수 있음을 보이고 있다. 미생물분해반응을 잘 묘사하는 Michaelis-Menten 모델, Logistic growth 모델, Exponential growth 모델, 혹은 First order 모델 등을 실험데이터에 적용시켜본 결과 Exponential growth 모델과 First order 모델이 SBBR 반응조로부터 구한 COD 분해곡선의 fitting에 우수하였는데, 위 두 모델식을 적용하여 본 결과, COD의 분해특성은 Exponential growth 모델에 적합하였다.

냉각수 조건에 따른 수질인자의 특성변화

조관형,우달식 청운대학교 건설환경연구소 2011 청운대학교 건설환경연구소 논문집 Vol.6 No.1

This study was investigated to control the corrosion and scale at the cooling water system in steel works. Laboratory tests were performed for the indirect cooling water system of plate mill. Throughout the experiment, various factors such as leakage of pipes, heating rate and capacity, and the reaction between existing and substitute inhibitors were carefully monitored. The results showed that the harmful effect of high temperature could be minimized, and satisfactory corrosion/scale controls were effectively achieved using inhibitor at 65℃ and 80℃. The batch tests in the gas scrubbing cooling water system of blast furnace and cooling water system of corex plant indicated that the new inhibitor was more effective for the prevention of corrosion and scale than the existing one. 온도에 따른 부식도의 증가정도가 미약하거나 감소하는 경향을 보이는 것으로 관찰되었는데, 65℃의 온도에서의 순수는 부식 및 부착도면에서 일반 담수 농축수에 비해 효과가 양호하였고, 특히 약품처리시에 효과가 매우 좋은 것으로 파악되었지만, 80℃에서는 약품주입효과가 크지 않은 것으로 관찰되었다. 연수에 의한 부식도는 약품주입 유무에 관계없이 매우 높게 나타났는데, pH가 산성으로 갈수록 연수의 경우 부식도가 높게 나타났다. 부식도와 유사하게 부착도의 경우도 온도에 따라 증가하는 경향을 보였는데, 약품의 주입에 따른 효과는 65℃이상에서 부착의 제어정도가 증가하였으며, 80℃로 온도를 상승시킨 경우에도 비교적 낮은 부착도를 보이는 것으로 나타났다.

동관에서 pH, 알칼리도, 염소이온이 부식에 미치는 영향

조관형,김선일,우달식,Jo, Kwan-Hyung,Kim, Sun-Il,Woo, Dal-Sik 한국환경보건학회 2007 한국환경보건학회지 Vol.33 No.1

This study investigated the effects of pH, alkalinity, and chlorine ion which are important water quality impact factors to the corrosion in the simulated distribution system where the copper pipe is affixed. The result shows that pitting index was increased as the alkalinity and chloride ion increase in the distilled water, but there was no relation to pH. Actually the uniform corrosion rate was decreased as the pH increase with the laboratory tap water. In conclusion, it is necessary to control the pH which stands above minimum 7.5 to prevent pitting corrosion in the copper pipe. Consequently, comprehensive research about the effect of lime soda($Ca(OH)_2$) which was used as a coagulation additive in the water treatment plant to pipe corrosion must be accomplished additionally.

소규모 물재생센터의 고도처리효율 향상

조관형,김진수 청운대학교 건설환경연구소 2013 청운대학교 건설환경연구소 논문집 Vol.8 No.1

In this study, natural biological sewage treatment system was proposed to develop excess removal of nitrogen and phosphorus which known as nutrients causing eutrophication in the closed water environment. The total nitrogen treatment removal efficiency was changed with the C/N ratio of sewage influent. In the early operating period where low C/N ratio range to 2∼3, the removal efficiency was very low, whereas the removal efficiency was increased to 79% with methanol input for a supplemental C/N ratio which changed by the input load amounts of an influent. Especially, when C/N ratio was increased to 15∼30, the total nitrogen removal efficiency was the highest. The removal efficiency of T-P showed stable of 70% from the beginning of the experiments and this results implies that adsorption to the media was occurred in the biological filtration reactor and biological uptake in the oxidation reactor. 소규모 하수처리에 있어 영양염류의 제거효율을 높이기 위해서 자연정화공법을 조합한 효율적인 처리장치를 개발하여 현장적용 실험을 실시한 결과, T-N의 경우는 낮은 C/N비 보충을 위해 탄소원인 메탄올 투입 후 탈질반응 촉진으로 평균 79%의 처리효율을 보였으며 특히 C/N비가 15~30일 때 가장 처리효율이 높은 것으로 조사되었다. T-P 경우에는 운전초기부터 처리효율 70%대를 유지하며 안정적인 처리효율을 보였는데, T-P의 제거효율은 산해분해조의 생물학적인 제거기작 외에 후처리공정인 생물여과조에서의 미생물 담체에 의한 흡착에 의한 인 제거로 인하여 운전초기부터 안정적인 처리효율을 보인 것으로 판단된다. 따라서 농어촌지역의 소규모 물재생센터의 경우 낮은 C/N의 조건에서도 적절하게 생물학적 처리와 식물정화공법을 적절하게 조합하면 더 높은 처리효율을 얻을 수 있다.

회원작품 - Enlluné _ '섬, 바람 그리고 달빛이 머무는 집'

조관형,Cho, Kwanhyeong 대한건축사협회 2020 建築士 Vol.618 No.-

응집침전에 의한 제철공장 냉각수질향상

조관형,우달식,황병기,이선주,박덕원,Jo, Kwan-Hyung,Woo, Dal-Sik,Hwang, Byung-Gi,Lee, Seon-Ju,Park, Duck-Weon 한국환경보건학회 2009 한국환경보건학회지 Vol.35 No.5

This study was initiated to improve the cooling water quality by chemical coagulation and sedimentation in steel mills. Due to the inefficient flocculation in the settling tanks of blast furnace cooling water systems, the solid particles in the cooling water overflow accumulate and clog the cooling system. To protect the cooling water system from such fouling, proper flocculants must be continuously used. Laboratory tests were performed for the indirect cooling water system of a plate mill. The batch test in the gas scrubbing cooling water system of a blast furnace showed that the proposed coagulant was more effective for the improvement of coagulation and sedimentation than the existing one. During the tests, cationic flocculants were more effective than use of only an anionic flocculant. The suggested combination of anionic and cationic flocculants can probably improve the turbidity removal efficiency of the cooling water. Proper control of the overflow rate by the designed residence time would help turbidity removal efficiency in the settling tank. In addition, the settling can be enhanced by adopting rapid and slow mixing alternatively. Scale problems in blast furnace cooling water system were reduced to some extent by efficient settling.