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하수슬러지 직접 건조방식에 의한 악취물질 배출 특성 및 기여도 평가
김훈제,동종인 한국폐기물자원순환학회 2020 한국폐기물자원순환학회지 Vol.37 No.6
The foul odors from the sewage sludge treatment facilities have been issues. In order to solve the foul odor issuesfromthe sewage sludge treatment facilities, drying of the sewage method was adopted. As of 2016, 76 out of 100 sewagesludge treatment facilities have adopted the drying facilities. In this study, the characteristics and effects of the odors thatare generated while drying the sewage sludge were investigated. From the results, it was found that the methyl mercaptanand organic acids contributed significantly to the odor emission. However, it was observed that the organic acids and thealdehydes were high in the final air pollution control equipment facility such as the wet scrubbers. The wet scrubbersare capable of removing organic acids effectively. In addition, it was found that the carbon dioxide that was dischargeddue to the direct drying method restricted the use of NaOH, which implies that the organic acids were not removedcompletely. Hence, a combustion method or a microbial deodorization method is suggested in this study. From the resultsof these methods, it was observed that they removed the organic acids and aldehydes effectively and also reduced theenvironmental impact that was caused due to the emission of the malodorous substances. Therefore, the combustionmethod and the microbial deodorization method are suggested over the direct drying method in order to control theemission of the foul odor from the sewage sludge treatment facilities and to reduce the environmental impact caused bythe emission of malodorous substances.
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유범식,김훈제 안성산업대학교 1996 論文集 Vol.28 No.-
In case that the length of Backfill behind wall is confined, the active earth pressure acting wall will be reduced as compare with that calculated by conventional active earth pressure theories. Consequently, in this research , the theoritical formula of active earth pressure is proposed and conclusions are following. The angle of failure plane, 'α' of backfill soil is inclined to reduce as 'B/H' increase regardless of the angle of internal friction of backfill soil and earth pressure increase as the angle of internal friction reduce. The reduction effect of active earth pressure according to backfill length increase as 'B/H' more reduce than 'B/H=0.6'.
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