• 한국토양비료학회지
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• 제31권1호
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• pp.72-76
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• 1998

일반토양과 시설재배지 토양을 공시하여 1l 광구병에 토양 600g씩 충진하고 토양 1kg당 양송이퇴비, 계분퇴비, 돈분퇴비, 어분퇴비를 각각 0, 10, 20, 30, 40, 50g상당량을 시용하였다, 온도를 10, 20, 30, $40^{\circ}C$로 조절하고 중류수를 토양 1kg당 50, 100, 200, 300ml 첨가하여 각 처리별 아황산가스 발생량을 조사하여 다음과 같은 결과를 얻었다. 아황산가스 발생량은 황함량이 적은 양송이퇴비, 계분퇴비 및 돈분퇴비에서는 적었으나 황함량이 많은 어분퇴비 처리구에서는 10g/kg처리에서 부터 매우 큰 차이로 증가 되었다. 어분퇴비처리구는 10g이하에서도 시 용량증가에 따라서 아황산가스 발생량이 현저히 증가되었고, 황함량이 적은 일반토양보다 황 함량이 많은 시설재배지 토양에서 가스발생량이 높았다. 아황산가스 발생량은 온도가 높을수록 증가되었으며, 수분 처리별로는 150ml 첨가구에서 가장 많이 발생되었다.

• Asian-Australasian Journal of Animal Sciences
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• 제6권2호
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• pp.259-264
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• 1993

Rice straw treated with anhydrous ammonia and/or sulphur dioxide was incubated with rumen liquor for 24 hours and 48 hours to investigate the changes in cell wall structure caused by the treatments and bacterial degradation using scanning electron microscopy (SEM). A less significant tissue loss of untreated rice straw was inspected after incubated for 24 hours and 48 hours. Sulphuration decreased the thickness of sclerenchyma and apparently removed parenchyma tissues. Ammoniation degraded the phloem, and the lignified inner portion of the cell wall was completely, however, little collapsed epidemis and vascular bundles. Ammonia and Sulphur dioxide combined treatment removed the inner layer from outer layer. The extent of apparent degradability following combination treatment was the largest due to the enhanced microbial degradation of sclerenchyma and parenchyma cells.

• 환경영향평가
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• 제7권2호
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• pp.71-82
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• 1998

This study focuses on one of the most typical energy-intensive industries, the steel industry. The two-fold purpose of the study is to develop a model to assess measures to alleviate sulfur dioxide($SO_2$) emissions from the steel industry and to propose a concrete $SO_2$ emission reduction measure from the steel industry. This study partially employed and modified AIM(Asia-Pacific Integrated Model) developed by Japan National Environmental Research Institute to develop AIM/KOREA SULFUR model for simulation. In the study, a base scenario, which is BAU(Business As Usual) scenario, and mitigation scenarios(a use of low-sulfur contain fuel, fuel conversion to cleaner energy, an induction of desulfurization systems, and energy saving) were employed. The results of the simulation are summarized below: The sulphur dioxide emission from the steel industry in 1992 was estimated to be 252,000 metric tons; however, according to BAU scenario, sulphur dioxide emission is expected to be increased to 586,000 metric tons, which is 2.3 times greater than that in 1992 by year 2020. To alleviate such increasement, simulation results under various 7scenarios proved that some degrees of reduction may be possible by an induction of desulfurization systems although there may be numerous ways to interpretate the simulation results; however, the bottom line is that it appears to be difficult to achieve the Korean Ministry of Environment's policy goal-a mitigation of sulphur dioxide concentration to 0.01ppm.

• 환경영향평가
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• 제8권1호
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• pp.29-40
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• 1999

This study focuses on one of typical energy-intensive industries, the cement industry. The purpose of the study is to propose $SO_2$ emission reduction measures in the cement industry. This study partially employed and modified AIM(Asia-Pacific Integrated Model) developed by Japan National Environmental Research Institute to develop AIM/KOREA SULFUR model for simulation. In the study, a base scenario, and mitigation scenarios(a use of low-sulfur contain fuel, fuel conversion to cleaner energy, an induction of desulfurization systems, and energy saving) were employed. The results of the simulation are summarized below: The sulphur dioxide emission from the cement industry in 1992 was estimated to be 106,000 metric tons; however, according to base scenario, sulphur dioxide emission is expected to be increased to 219,000 metric tons, which is 2.1 times greater than that in 1992 by year 2020. To alleviate such increasement, simulation results under various scenarios proved that some degrees of reduction may be possible by an induction of desulfulization systems although there may be numerous ways to interpretate the simulation results.

• Asian-Australasian Journal of Animal Sciences
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• 제6권2호
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• pp.265-270
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• 1993

Ammonia and/or sulphur dioxide treated and untreated wheat leaf sheaths were compared for cell wall digestion by incubation with rumen liquor for 24 and 48 hours. Scanning electron microscope (SEM) was used to study the relative rate and extent of cell wall digestion. Treated wheat straw leaf sheaths were distorted, with more distortion observed in ammonia and sulphur dioxide combined treatment than any other treatment. Rumen liquor digestion for 24 hours of untreated leaf sheath showed disrupted phloem, partially ruptured parenchyma and vascular tissues and further partially distorted inner bundle sheaths and vascular bundle after 48 hours incubation. Sulphurated leaf sheaths showed extensive degraded parenchyma and sclerenchyma material in 24 hours incubation, however, all tissues were irregulary shaped in 48 hours incubation. In ammoniation, epidermal cell walls and small vascular bundles began to disintegrate by 24 hours incubation, extensively changed structure and degraded epidermal tissue by 48 hours incubation. Combination treatment of leaf sheaths degraded all cell walls of parenchyma, phloem and vascular bundle by 24 hours incubation, however, structures only of inner bundles sheath with extended land, sclerenchyma and cutinized epidermal cell walls remained.

• 한국환경보건학회:학술대회논문집
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• 한국환경보건학회 2003년도 Challenges and Achievements in Environmental Health
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• pp.50-65
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• 2003

Air pollution is very serious in China. This paper reviews the relevant research and countermeasures in China. The followings are focused in this article: 1) three major types of air pollutions: sulphur dioxide, vehicle emission and indoor air pollution; 2) the health effect of the three types of pollution; 3) major countermeasures adopted by Chinese Government.

• 한국환경보건학회지
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• 제2권1호
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• pp.29-31
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• 1975

This experiment Was carried out under two points of view, from May 1st to the end of 1973. One was the comparative determination of the activation factor of Lead dioxide by kinds in measuring of Sulfur oxides concentration by $PbO_2$ cylinder method, and the other was the comparison that result with the record of auto analyzer. Five measuring sites were selected out of Seoul City. Three kinds of Lead dioxide made in Japan (B,C and D) were compared with Standard $PbO_2$ (A for use in Determination of Sulphur in the atmosphere, purity 99% up) made in British Institution, and monthly measuring was conducted at every sampling site. The recording by auto analyzer (Beckman Model 906-A $SO_2$ Analyzer) was conducted once or twice a month for 24 hours at each sampling site during the same period. And some significant results were obtained. 1. In comparative experiments to determine the activation degree of three kinds of Lead dioxide (B,C and D), the obtained correction factor of B reagent was 1.09, 1.16 in C and 1.30 in D against Standard $PbO_2$ (A). Therefore, it should be in need of standardization or clear statement about the reagents for use, in determination sulfur oxides by $PbO_2$ cylinder method. 2. Generally, the concentration of Sulfur dioxide by wilkins' convertion method from $SO_3$ showed about 20-30% higher than those by Auto analyzer.

• 한국대기환경학회지
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• 제7권3호
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• pp.156-168
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• 1991

The purpose of this paper is to develop a stochastic model for daily sulphur dioxide $(SO_2)$ concentrations prediction in urban area (Seoul). For this, the influence of the meteorological parameters on the $SO_2$ concentrations is investigated by a statistical analysis of the 24-hr averaged $SO_2$ levels of Seoul area during 1989 $\sim$ 1990. The annual fluctuations of the regression trend, periodicity and dependence of the daily concentration are also analyzed. Based on these, a nonlinear regression transfer function model for the prediction of daily $SO_2$ concentrations is derived. A statistical procedure for using the model to predict the concentration level is also proposed.

• 한국대기환경학회지
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• 제7권2호
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• pp.127-136
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• 1991

This paper is concerned with the development and application of a stochastic model for daily sulphur dioxide $(SO_2)$ concentrations in urban area (Seoul). For this, the characteristics of the regression trend, periodicity and dependence of the daily $SO_2$ concentration are investigated by a statistisical analysis of the daily average $SO_2$ values measured in Seoul area during 1989 $\sim$ 1990. Based on these, nonlinear regression time series model for the prediction of daily $SO_2$ concentrations is derived. A statistical procedure for using the model to predict the concentration level is also proposed.

• 청정기술
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• 제3권1호
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• pp.106-113
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• 1997

본 연구의 목적은 유동층반응기를 이용하여 층온도와 유속에 따른 석회석입자(천연석회석과 제지슬러지)의 소성과 황화반응 특성에 관해 조사하는 것이었으며, 실험결과는 다음과 같다. 첫째, 층온도는 천연석회석과 제지슬러지 입자의 소성과 황화반응에 매우 큰 영항을 미치는 것으로 나타났으며, 천연석회석의 경우 층온도 $850^{\circ}C$ 또는 $900^{\circ}C$가 최적 온도였고 제지슬러지의 경우 층온도 $800^{\circ}C$가 최적 온도로 조사되었다. 둘째, 유속이 증가할수록 입자의 비표면적은 감소하는 현상을 보였으나 큰 차이를 나타내지는 않았으며, 제지슬러지 입자의 비표면적이 천연석회석 입자의 비표면적 보다 훨씬 큰 것으로 나타났다. 셋째, 유속이 증가할수록 입자의 탈황능이 감소되었으며, 제지슬러지 입자에 의한 흡착량이 천연석회석 입자에 의한 흡착량 보다 큰 것으로 나타났다. 따라서 제지슬러지는 우수한 탈황제라는 것을 확인 할 수 있었으며, 유동층에서 소성반응과 황화반응시 층온도는 매우 중요한 변수라는 것을 알 수 있었다.