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회분식 발효 Data를 이용한 생물반응기의 부피산소전달계수(KLa)추산 방법
趙武煥 영남대학교 공업기술연구소 1989 연구보고 Vol.17 No.1
A simple and practical estimation method of volumetirc oxygen transfer coefficient(??)was developed theoretically and was demonstrated experimentally. This new method used real batch fermentation data, i.e., cell density and dissolved oxygen concentration profiles versus time. The advantages of this method were that it estimated kla on the real fermentation conditions, and that kla was not affected by the response time of DO probe.
趙武煥 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.1
Under the assumption that a first order, exothermic reaction takes place in the reactor, and reactant and coolant flow countercurrently without axial and radial dispersions of concentration and temperature in each phase. Temperature and conversion profiles of process stream, and temperature profiles of coolant are estimated numerically along the length of nonisothermal and nonadiabatic tubular reactor. The results are compared with those of isothermal and adiabatic reactors. The effects of various dimensionless parameters on the temperature and conversion profiles are discussed.
조무환,김동암 한국초지조사료학회 1983 한국초지조사료학회지 Vol.4 No.1
조무환,이진태,김준하,Henry C. Lim 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.3
A modified version of the IAWQ activated sludge model No. 1 (ASM 1) is adopted for the simulation of a sequencing batch reactor (SBR) to optimize the removal of nitrogen (T-N) and organic matters (COD) from wastewater. Since the removal of nitrogen requires both aerobic nitrification and anaerobic denitrification, we seek to find the optimal strategies of substrate fill and aeration. Substrate filling strategy critically influences the removal efficiency of T-N and COD; one fast discrete fill in the beginning of a cycle leads to the best result, while a slow continuous fill results in poor nitrification. In addition, the total aeration time is more important for the removal efficiency than the aeration frequency. A short aeration is beneficial for T-N removal, while a long aeration is beneficial for COD removal as expected. As a result, there is an optimal condition of aeration for the simultaneous removal of T-N and COD.
강제 순환식 Air-lift Reactor를 이용한 Polyester 감량폐수의 생물학적 처리
이종현,김정목,조무환 嶺南大學校 工業技術硏究所 1994 工業技術硏究所論文集 Vol.22 No.1
For effective treatment E. G.(Ethylene glycol) which is main component of polyester weight loss wastewater and difficult to remove by phycochemical treatment, air-lift reactor using forced circulating was developed. Optimum temperature of continuous process was founded as 30∼35℃, and ?? removal efficiencies were measured as 98.7%, when influent ?? concentration was 3,500㎎/l at hydraulic retention time of 12hrs. Even though, this reactor was no needed sludge recycle and no used support materials, the ?? removal efficiency was similar to that using natural zeolite as support materials, at same condition. Also, that was revealed more than 98% and not related to MLSS concentration at above conditions, but there was no reasons more than needs of MLSS concentration, because dissolved oxygen concentration was linely decreased with increasing of that. The ?? removal efficiency was founded 98%, when F/M ratio and ?? loading rate were 16 ㎏ ??/㎏ MLSS and 14㎏ ??/㎥ ·day, respectively. Kinetics constants such as Y and and ?? were estimated 0.440 ㎎ MLSS/㎎ ?? and 0.065 ??, respectively.
趙武煥 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.2
In case of exothermic and very fast catalytic reactions, packed bed reactor may make the problem of hot spot which will cause the thermal deactivation of the catalyst. To avoid this phenomenon the tube-wall reactor whose inside wall is coated with catalyst is receiving increased interest. A non-isothermal analysis is presented of an irreversible gas-phase reaction occurring at the catalytic wall of a tube-wall reactor. The differential equations describing steady-state mass and heat balance is derived for the limiting case in which conversion is limited by the rate of diffusion of reactant to the wall. The results of numerical analysis show that the mass Stanton number, S??, the reactor aspect ratio, a, and isothermal expansion coefficient, ε affect both the conversion of reactant and the temperature of reactor, but the thermal Stanton number, S?? the dimensionless coolant temperature, Y??, the ratio of bulk to total heat transfer coefficient, α, and the thermicity factor, β affect only the temperature of reactor.