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신정부의 환경정책패러다임은 국민이 체감하는 환경질 개선을 달성할 수 있는 실질적 대책을 실천하는데 있으며, 환경보전과 경제발전이 상생하는 방향으로 정책을 선진화하는데 있다. 따라서 향후 5년간 환경정책비전과 목표주요 핵심과제의 실천계획등 신정부의 환경정책방향을 환경관련학회 학술활동에 연계하면 보다 나은 환경정책지원이 될 수 있을 것으로 사료된다.
This study is performed to examine the relationship between air pollution exposure and mortality in Incheon for the years of 1998 - 2001. Daily counts of death were analyzed by general additive Poisson model, with adjustment for effects of seasonal trend, air temperature, humidity, and day of the week as confounders in a nonparametric approach. Daily death counts were associated with CO(l day before), O₃(2 day before), PM10(l day before), NO₂(l day before), SO₂(l day before). Increase of 32.21㎨(interquartile range) in PM10 was associated with 1.9 % (95% CI = 0.8 % - 2.9 %) increase in the daily number of death. This effect was greater in children (less than 15 aged) and elderly(more than 65 aged). We concluded that Incheon had 2 - 4 % increase in mortality in association with IQR in air pollutants. Daily variations in air pollution within the range currently occurring in Incheon might have an adverse effect on daily mortality. These findings also support the hypothesis that air pollution, at levels below the current ambient air quality standards of Korea, is harmful to sensitive subjects, such as children or elderly.
This study was conducted to investigate the relation between ozone concentration and the affecting factors in Seosan City of Korea from Jan. 2002 to Dec. 2002. We analyzed the air pollutants such as N0₂, PM10, S0₂, CO and the meteorological factors including solar radiation, air temperature, wind speed and relative humidity. The analytical data were taken statistics by SPSS method. The results were as follows: The seasonal average concentration of ozone were detected 35.0 ppb in Spring, 25.4 ppb in Summer, 23.5 ppb in Autumn and 21.4 ppb in Winter. So the difference of concentrations showed significantly in statistics. The hourly ozone concentration in a day was increased at 7-9 AM, peaked at 3-4 PM. The correlation coefficients was negative to ozone concentration and N02, S02, CO, relative humidity, but positive to solar radiation, air temperature, wind speed. With stepwise multiple regression analysis on the 8 factors such as N0₂, PM10, S0₂, CO, solar radiation, air temperature, wind speed and relative humidity, the seasonal primary factors were air temperature in spring. relative humidity in summer and solar radiation in autumn and winter. The above results suggest that ozone is the secondary pollutant by photochemical reaction as the concentration of ozone was increased with the raise of solar radiation.
The present time, water hyacinth(Eichhoernia crassipes) was widely used for a purification of a polluted lake, livestock wastewater and sewage wastewater treatment. This study was conducted to evaluate the propriety of sewage wastewater treatment by water hyacinth(Eichhornia crassipes). On the study of optimal cultivation density, 3 kg/m² was selected for the most suitable initial cultivation density through the BOD, T-N and T-P removal efficiency. In experiment of purification capacity, hyacinth(Eichhornia crassipes) removed the 267.2 mg BOD/kgㆍday, 72 mg T-N/kg . day and 8.6 mg T-P/kg' day at 30 operation days respectively. The result showed that hyacinth(Eichhornia crassipes) could be used for recovery of eutrophic lake effectively. In the test of optimal HRT(hydraulic retention time), 9 days was selected with the suitable HRT, and BOD, T-N and T-P were removed with 75%, T-N 88% and T-P 97% respectively.
Recently, Indoor air quality(IAQ) in workplace, residential environments and schools has been concern of people, scientists and related the public. And so in Seoul has recognized the healthy effect related to IAQ in schools. Therefore, the objective of this study reported in this article were to measure and compare the perception of IAQ of selected air pollutants at three different schools in Seoul. We performed a questionnaire survey of 400 students about their awareness for the importance of IAQ in our school. And we measured the IAQ of 3 schools considering as site region, construction year and studying level. The indoor air pollutants and parameters such as temperature, relative humidity, respirable particulate matter(PM10). formaldehyde(HCHO), total bacteria counts(TBC), carbon dioxide(C0₂), and noise were monitored in indoors. In results, all most response of occupant has recognized the awareness of IAQ at schools. The PM10. TBC and Noise level of all schools were higher than the standard of the public 150㎍/m³ and 500 CFU/rn³, the level formaldehyde(HCHO) was below 0.1 ppm of the healthy guideline of Korea And the concentration of CO₂ were investigated below 1,000 ppm of the standard implying ventilation in 2 schools except for 1 school(c school). Finally. the control of most important pollutants of IAQ in school were PM 10. TBC and Noise. Therefore, it can be concluded that the indoor air quality of selected 3 schools studied was perceived as acceptable. it is recommended that the government related IAQ was suggested the guideline and control of lAQ problems in schools. and all member relating school need to be effort to reduce the exposure of sources to undesirable indoor pollutants such as Particlate and Noise.
This study was carried out to get efficient of organic material removal and wastage sludge production minimized effects on the treatment of Brewhouse wastewater using aerobic RBC and curtain biological film contact process. As a results of bio film attachment experiment aggravation of water quality due to excessive bio film showed after every 13 days of operating times. The concentration of BOD at raw wastewater was 3800~5300mg/L and COD was 2300~3100 mg/L. The average BOD of effluent was maintained 18 mg/L and average COD was 26 mg/L. The result of this experiment was wastage sludge did not almost generated.
An objective of local exhaust hood design is to design the hood to operate as efficiently as possible. The greatest loss normally occurs at the entrance to the duct, due to the vena contracta in the throat of the duct. This can be accomplished by minimizing the loss that results from the vena contracta. There have been little studied to be cost-effective approach as installing simple instrument inside the throat of the hood. The aims of this paper were to minimize entry loss using inner square, and to measure the effect of inner square when installed inside hood throat. The results of this study were as follows; First, the magnitude of vena contracta could be considered as the difference between direct measured velocity and calculated velocity, which is from Bernoulli theory. In circle hood, calculated velocity and direct measured velocity were 10.7m/sec and 10.3m/sec, respectively. And the calculated velocity and direct measured velocity in square hood were 7.7m/sec and 6.5m/sec, respectively. Second, effect of inner square by width was carried out. The widths of inner square were L/1(18m), L/2(9cm), L3(6cm) and L6(3cm). In case inner square was installed with 3cm width, the entry of coefficient was 0.93, comparing with 0.85 of entry of coefficient of general hood. Third, effect of inner square by distance from hood inside surface to inner square was carried out. The distances were L3(6cm), L6(3cm), L9(2cm) and L18(1cm). In case the distance was 3cm, the best efficiency was shown (Ce-0.93). Fourth, effect of inner square by location from hood entry to duct inside was carried out. The locations of inner square were entry(0cm), L6(3cm), L3(6cm), L2(9cm) and L/1(12cm). In case the location was 0cm, 3cm and 6cm, the entry of coefficients were 0.93, 0.92 and 0.90, respectively.
The generation of waste cable has been continuously increased as a production of electrical and communication media are extended. The current recovery methods, such as mechanical peeling, incineration, solvent extraction and pyrolysis, seems inadequate because they are either hard to apply in some cases or environmentally unacceptable. It has been shown that copper can be effectively separated from the jelly filled type cables using a soybean oil treatment method. As a result, jelly compound is vanished from the wire by soybean oil bath and waste wires are separated copper and PE by the mechanical chipper. This is a more environmentally friendly method than burning, and considerably faster than stripping.
This study was aimed to investigate the influence on the vicinity by air pollutant generated from facility of the district heating located in local small town. We selected the seven areas around the surroundings of facility of the district heating, compared the air quality evaluated before ,md after operations of the facility, and estimated the diffusion of air pollutant exhausted from the facility using a ISC model. The result was that the concentration of TSP before and after operations of the facility 89~94μg/m³ and 72~81μ g/m³, respectively and the latter showed a decline in concentration. Also, there was no relationship between straight distance from the facility of the district heating and the concentration of TSP. This result was applicable to cases of PM -10 and S0₂. We also investigated the influence on the air around the neighbor area by air pollutant produced from facility of the district heating using ISCLT3 model. The adding-concentrations of TSP, S02, N02, and CO were 0.0019~0.00183μg/m³, 0.0029~0.5648ppb, 0.2924~1.9837ppb, and 0.0087~0.0590ppb, respectively. It is predicted that each concentration is added to pollutant exhausted from facility of the district heating and is about 1/100~1/180, 000 of present air quality. This has a tiny influence on general air quality. According to this analysis, the concentration of air pollutant is less effected to pollutants expected by the facility of the district heating than other pollutants emitted from mobil source or industrial complex, and etc.