혐기성필터를 이용한 맥주폐수의 혐기성처리

조영태(Young-Tai Cho),조관형(Kwan-Hyung Jo),우달식(Dal-Sik Woo) 한국환경관리학회 2001 環境管理學會誌 Vol.7 No.1

혐기성슬러지의 SMA측정을 위한 초기실험조건

조영태(Young-Tai Cho) 한국환경관리학회 2006 環境管理學會誌 Vol.12 No.1

메탄생성량을 측정하여 구하는 비메탄생성균활성도 시험은 혐기성 공정의 성능과 안정성을 평가하는데 이용될 수 있다. 본 연구는 비메탄생성균활성도 측정을 하기 위한 이상적인 초기 실험 조건을 설정하는데 초점을 맞추고 있다. 초기 기질 농도, 초기 바이오매스 농도, F/M (Food/Microorganisms)비 및 혼합강도를 포함하여 네 가지 주요 조건에 대하여 연구하였다. 연구 결과 권장할 만한 초기실험조건이 얻어졌다. 초기기질의 농도는 초산으로서 1,000~2,000 ㎎/L 초기 바이오매스의 조건은 2,000~5,000 ㎎/L. 바람직한 먹이/미생물 비는 약 0.3 gHAc/gVSS이었고, 500㎖ 용량의 반응기와 자석막대기를 사용하는 조건에서의 적합한 혼합속도는 약 400 rpm 이었다. Specific Methanogenic Activity (SMA) tests can be used to evaluate the performance and stability of anaerobic process by means of monitoring the methane production. This study focused on the initial environmental conditions for SMA tests to provide biomass in the reactor with an ideal condition. Four major parameters including the initial substrate concentration, the initial biomass concentration, the food/microorganisms ratio and the mixing intensity were investigated. The result of this study showed recommendable initial test conditions; the substrate concentration as an acetic acid was 1,000 to 2,000 ㎎/L and the biomass concentration was 2,000 to 5,000 ㎎/L, A desirable F/M ratio was above 0.3 gHAc/gVSS, and the mixing intensity was around 400 rpm in the test conditions where a 500㎖ serum bottle and a magnetic stirrer were used.

쌀보리원료 주정폐액의 메탄발효저해시 유입수희석 효과

조영태(Young Tai Cho),백광욱(Kwang Woo Baek),장덕(Duk Chang) 大韓環境工學會 1990 대한환경공학회지 Vol.12 No.3

방향족 니트로화합물의 호기성 분해시 기질유도 질소성분의 미생물에 의한 이용

조관형(Kwan Hyung Jo),조영태(Young Tai Cho) 大韓環境工學會 1999 대한환경공학회지 Vol.21 No.2

β-시토스테롤의 지용성 치환체의 합성 및 특성에 관한 연구

정대원 ( Dae Won Chung ),조영태 ( Young Tai Cho ) 한국공업화학회 2006 공업화학 Vol.17 No.4

주정폐액의 고온·고율 혐기성 소화시 유기물부하율의 영향

조영태 건국대학교 1993 대학원 학술논문집 Vol.36 No.-

The treatment of distillery wastewater was investigated using a conventional anaerobic process. The goal of the research was to find the optimum organic loading rate. Experiments with changes in organic loading rate showed that COD removal efficiency was rapidly deteriorated when organic loading rate was over 1.51g COD/L/d. In this study, the optimum organic loading rate was 1.01g COD/L/d and COD removal efficiency was 86percent.

고농도 유기성 폐수의 혐기성 소화에 미치는 양이온의 영향에 관한 연구

조영태 건국대학교 1991 대학원 학술논문집 Vol.33 No.-

This study was undertaken to observe the effects of cations on bench scale conventional anaerobic digesters. Anaerobic digesters, operated on a 10day and 15day detention time at 55℃, were used in this study. The cation dosages used in this study are 150mg/l to 1000mg/l. The cations used in this study are Fe, Ca, Mg, K, Na and ammonium. A number of conclusions may be drawn from the results presented in this study. These conclusions are formulated as follows: Although there is high strength organic substance in the ingluent, if the elements are lack, the failure of digestion will bring about. In order to prevent failure from digester, we had to conduct trace element analysis of substrate. The methane content of digester gas is 73% by volume and total digester gas production rate is approximately 0.42㎥ per Kg of COD added, under the condition of iron added. In the condition of 1000mg/l Iron addition the gas production was inhibited, however, in the case of 300mg/l iron addition normal gas production maintained, in the result, iron could increase treatment efficiency. The addition of cation(Na^+, K^+, Ca^2+, NH_4^+) increased temporally the activity of methane forming bacteria. In the case of iron addition, organic removal efficiency is 67 percent.

단상 혐기성 소화공정에서의 동력학적 연구

조관형,조영태 한국환경과학회 2000 한국환경과학회지 Vol.9 No.1

Kinetic data for the acid phase anaerobic digestion were presented in this study and the constants were determined with acid production rate and gas production rate. Process models based on continuous culture theory were used to describe the characteristics of the acid forming microorganisms and to enable further development toward utilization of the process in a more rational manner. Acid phase digestion can be separated with appropriate manipulation of hydraulic retention time in anaerobic digestion. Kinetic analysis of data from the various hydraulic retention times using a phase specific model obtained from the acid phase indicated maximum specific growth rate of 0.40/h, saturation constant of 2,000㎎COD/ℓ, yield coefficient of 0.35 ㎎VSS/㎎COD utilized and decay constant of 0.04/h for the acid production rate. Similar analysis of data for the gas production rate indicated maximum specific growth rate of 0.003/h, saturation constant of 2,200㎎COD/ℓ, yield coefficient of 0.0035 ㎎VSS/㎎COD utilized and decay constant of 0.06/h.

pH 변화에 따른 클로라민 생성과 분해 특성

조관형,김평청,우달식,조영태 한국환경과학회 2002 한국환경과학회지 Vol.11 No.4

본 연구의 시료는 현재 서울특별시와 수도권 도시들에서 상수원수로 이용하고 있는 한강수를 대상으로 수행되었다. 배·급수계통의 2차 소독을 위한 클로라민소독의 특성에 관하여 고찰하였으며 그 결과는 다음과 같다. 1) 25 ℃, Cl_2 / NH_3-N비 1:1 ~ 14:1에서 pH6, 7, 8의 불연속점은 각각 Cl_2 / NH_3-N비 11:1, 9:1, 10:1이었다. pH6의 경우, Cl_2 / NH_3-N비가 9:1일 때 총 잔류염소량이 최대인 반면, pH7, 8의 경우 Cl_2 / NH_3-N비가 각각 6:1, 5:1일 때 최대가 되었다. 2) pH가 6, 7, 8로 증가함에 따라 모노클로라민이 최대로 생성되는 Cl_2 / NH_3-N비는 7:1에서 5:1로 이동하였으며, pH6 ~ 8 범위에서 pH가 증가함에 따라 모노클로라민의 생성량이 많았다. 3) 클로라민의 분해는 Cl_2 / NH_3-N비가 증가하고 pH가 낮을수록 증가하였다. 클로라민의 잔류성은 유리염소보다 월등히 좋았다. pH6에서 모노클로라민과 디클로라민이 생성된 이후, 접촉시간이 경과함에 따라 디클로라민의 분포비가 증가하였다. This study was conducted to investigate the characteristics of chloramination as a secondary disinfection in a drinking water distribution system. At the range from pH 6 to pH 8, monochloramine was predominant with a trace of dichloramine, and the free chlorine was detected after breakpoint. At 25℃, the breakpoints of pH 6, 7 and 8 appeared when the weight ratios of chlorine to ammonia nitrogen were 11:1, 9:1 and 10:1 respectively, and the peak points on the breakpoint curves at pH 6, 7 and 8 were in the Cl_2 / NH_3-N ratio of 9:1, 6:1 and 5:1 respectively. As pH increased from 6 to 8, maximum point of monochloramine on the breakpoint curve was moved from 7:1 to 5:1 in the weight ratio of chlorine to ammonia nitrogen. The maximum concentration of monochloramine was formed at the pH values of 7~8 and in the Cl_2 / NH_3-N ratio below 5:1. As the Cl_2 / NH_3-N ratio increased and the pH lowered, chloramines decay proceeded at an increased rate, and residual chloramines lasted longer than the residual free chlorine. The monochloramine and the dichloramine were formed at pH 6, and then the dichloramine continued increasing with contact lime.

활성슬러지 혼합미생물과 Nocardia asteroids 에 의한 페놀화합물 분해시 양성자이온의 영향

조관형,조영태,우달식 한국환경과학회 2002 한국환경과학회지 Vol.11 No.6

This study was investigated to evaluate the effect of the sodium ion and pH on toxicity of dinitrophenol at high concentrations (0.41 to 0.54 mM), over a sodium concentration range of 0.1 mM to 107 mM and over a pH range of 5 to 9. The concentration of sodium ions in the activated sludge mixed liquor seemed to have very little effect on dinitrophenol toxicity. However, lack of sodium in the growth media resulted in a reduction of the dinitrophenol degradation rate by bacterial isolate from the activated sludge culture, which has been identified as Nocardia asteroides. Dinitrophenol inhibition was found to be strongly dependent on mixed liquor pH. The dinitrophenol degradation rate was highest in the pH range of 6.95 to 7.84; at pH 5.94 degradation of 75 ㎎/L dinitrophenol was significantly inhibited; at pH < 5.77, dinitrophenol degradation was completely inhibited after approximately 30% of the dinitrophenol was degraded.