오존처리시 Bromate생성에 미치는 온도 및 pH의 영향

이무강,김영철,최종원 한국환경과학회 2004 한국환경과학회지 Vol.13 No.7

The objective of this study was to investigate the effects of pH and temperature on the formation of bromate, which is ozonation by-products, during ozonation. In this experiment, the operating parameters including pH 3~10 and temperature 15 ~ 30 ℃ were studied. Through the study for the bromate formation, reaction rate constant, and ozonation effect index on pH and temperature, the results obtained are as follows. At the same initial pH condition, the increase of pH shown similar trends even if the reaction variables such as temperature and reaction time of ozonation were exchanged. As pH and temperature were increasing, the bromate concentration was increased but bromine(HOBr+OBf) was decreased with increasing pH from 3 to 10. The activation energy(J/mol) for bromate formation decreased with increasing pH. The rate constants of bromate formation for the reaction of ozone and bromide, and ozone dosage coefficient(K_(o)) increased with temperature and pH. Ozonation effect index(OI) decreased with increasing temperature and pH.

오존처리에 의한 Bromate의 생성이 고환독성에 미치는 영향

이무강,정운용,정민화,한갑이,조희숙,최종원 慶星大學校 環境問題硏究所 2002 環境硏報 Vol.12 No.1

Bromate is a chemical oxidizing agent that has been used in analytical chemistry, in four milling, in beer malting, in cheese making, as a component of home and salon permanent hair-wave kits. In this study the objective was to investigate the effects of testis toxicity due to bromate in rats. On the biological study, the body weight changes, bromate(0, 0.1, 0.2, 0.4g/L) treated group showed decreased in the body weight and testis compared to the normal group. But kidney weight was increased. Hepatic and spleen weight were not effected compared to the normal group. Lipid peroxide content in the testis was increased by bromate which was concentrated 0.4g/L for 24 weeks. Testis cytosolic enzyme system(xanthine oxidase, aldehyde oxidase) of bromate group were significantly increased in comparison with those of normal group and microsomal enzyme system were not effected. And blood testosterone concentration was significantly decreased in comparison with those of group given bromate.

나프탈렌유도체의 오존화 반응 및 생물학적 분해의 동력학적 연구

이무강,박성배 대한환경공학회 1992 대한환경공학회 학술발표논문집 Vol.1992 No.12

오존 - 활성탄을 이용한 형광물질의 제거

이무강,최혁 대한환경공학회 1995 대한환경공학회 학술발표논문집 Vol.1995 No.12

활성탄 전해공정에 의한 돈사폐수 처리 : CI^- 농도의 영향 The Effect of CI^- Concentration

이무강,신현무,라중균 慶星大學校 環境問題硏究所 2001 環境硏報 Vol.11 No.1

Swine wastewater, a major one of livestock wastewaters, was treated using three-dimensional-electrolytic process. The concentration of electrolyte plays a major role in the electrolysis reaction and chloride has been commonly used as electrolyte. The effects of Cl- concentration was studied in the removal of COD, NH4+-N, and T-N. The removal efficiency of NH4+-N was increased with increasing Cl concentration only at higher supply of electric current(2A). In the case of Cl concentration of 2,000 mg/L, it was observed that the removal efficiencies of COD, NH4+-N, and T-N were the highest and after 5 hours reaction those were about 94%, 67%, and 50%, respectively.

釜山市 飮用水用 地下水 汚染現況에 관한 硏究

이무강 慶星大學校 1998 論文集 Vol.19 No.2

This study was carried out to classify the regional characteristics of water quality on each item, which was decided to be fail for drinking water standard, for total 2,399 ground water wells from July 1, 1994 to December 31, 1995. The ground water was analyzed by the procedures of drinking water analyzed by the procedures of drinking water analysis and decided fail if even one of 42 items exceeded the drinking water standards. Through the investigation of pass or fail for water quality of wells in Pusan, the following results were obtained. In case of Pusan, the percentage of number and usage of ground water well were 1.12% and 2.36%, respectively, comparing to those of whole country. The number of wells were average 3.2 per square kilometer. However, if KangSu-Gu (423.02 capita per ㎢) and KiJang-Goon(330.52 capita per ㎢) were exempted, the number of wells per area(㎢) were 6.0, which was two fold higher then that of the whole country. For the ground water wells developed for drinking, the number of wells per area(㎢) showed good correlation to the population density and 57.48% out of 2,399 wells were decided to be fail. The failures according to the usage of land were decided to be 67.61% for industrial area, 65.65% for commercial area, 57.77% for green belt area, and 55.88% for residential area. However, it was speculated that the determination of failure was very difficult, because Pusan consists of complicate combination of areas. The failure items of ground water wells in Pusan were 28 out of 42 items, and among total 2,553 of failed items, wells contaminated with a germ were decided to be 63% as 937 items for bacteria and 683 items for E.coli.

폐주물사로부터 제조된 방식재의 방식력 및 환경에 대한 영향

이무강,김영철,나중균 한국폐기물자원순환학회 1999 한국폐기물자원순환학회지 Vol.16 No.5

은이온 교환 A형 제오라이트로 부터의 은이온용출이 항균력에 미치는 영향

이무강,신현무,임경천 한국환경과학회 2004 한국환경과학회지 Vol.13 No.1

An author has been known that A-type zeolite supported with silver ions has excellent antibacterial activity. However, it is no research of concern in the antibacterial activity of eluted silver ions. This study tested the elution of silver ions from A-type zeolite silver ions in deionized distilled water and NaNO₃ aqueous solution. In NaNO₃ aqueous solution of 74mM to 588mM, it was found that the concentration of silver ions and electric conductivity increased with the increasing concentration of sodium ions, and equilibrated at 15 min, and the ion exchange equilibrium coefficient, k, is 1.3x 10^(-3). However, deionized distilled water is not equilibrated to pass 6 months. A-type zeolite sodium ions showed no antibacterial activity. It was found that antibacterial activity was exhibited even at the concentration of 10 nM of eluted silver ions, and E-coli died with the incorporation of 2.43 × 10^(8) Ag ion/cell. antibacterial activity of A-type zeolite silver ions were mainly attributed to hydroxyl radical.

活性汚泥工程으로 都市와 染色工團 混合廢水處理時의 溫度의 影響

李武康 영남이공대학 1984 論文集 Vol.13 No.-

The wastewater mixed with 60% of the municipal sewage and 40% of the dye industrial wastewater was treated with a bench-scale to determine the design parameters of the activated sludge process at the various temperatures such as 10°C, 20℃, 30℃, 35℃, 40℃, and 45℃. It was found that the values of parameters at 30℃ were larger than those of other temperatures, and also that the most effective treatment could be obtained at 30℃. Since the temperature correction factor 0, is the function not only to the temperature, but also to the concentration of substrate, it was estimated by in this research using the substrate utilization rate. The estimated mean values of 0. are 1.0362 at the temperature range between 10℃ to 30℃, and 0.9455 at the temperature range between 30℃ to 45℃ respectively. The concentration of effluent substrate depending on the variation of sludge retention time 0, were evaluated by using the parameters which were determined at each temperature. When the concentration of effluent substrate was less than 50mg/ℓ and the treatment efficiency was more than 87%. the optimal sludge retention time was 15days, 8days, 17days, 18days at 20℃. 30℃. 35℃ and 40℃ respectively. but those were impossible at 10℃ and 45℃. The concentration of effluent substrate was optimized with the maximum reaction rate V_(max) and half velocity constant K, which were corrected with the temperature correction factors at experimental temperatures. The result of the optimization values of V. and K, at each temperature. The optimization of reactor volume and the concentration of MLVSS in the reactor. using the theoretical values of V_(max), and K, at 40℃, were simulated with the variation of hydraulic recycle ratio and the concentration of recycle sludge for the 87% of treatment efficiency. When the hydraulic recycle ratio and concentration of recycle sludge were 50% and 8000mg/ℓ, the reactor voulme and concentration of MLVSS in the reactor were 4.61 and 2600mg/ℓ respectively. In the result studied above, the temperature correction factor which was seldom investigated at over 30℃ was obtained accurately considering the temperature and the concentration of substrate, and the developed method could also be applied to the treatment of other wastewater. values which are corrected with substrate concentration and temperature, and the measured showed that the concentrations of effluent substrate are corresponded with the theoretical

合成染色廢水에 對한 活性汚泥工程의 最適化(Ⅰ)

李武康 영남이공대학 1980 論文集 Vol.9 No.-

Here is reported the basic parameters for the design of synthetic dye waste-water treated with activated sludge process. The obtained basic parameters are as follows; R=0.0161 day^(-1) a=0.37, b=0.057. a'=0.6 b'=0.1 K₁=312.5㎎/ℓ V_(max)=5.63. And also is carried out the computer simulation for the optimization of activated sludge process with these parameters. In the treatment efficiency is more than 95.05%. the sludge retention time Cc is needed over 7 days. The relationship between the volumetric recycle ratio (r) and the reactor volume or the microbial mass concentration for various values of X, are shown in Fig. 7, Fig. S and table 3.