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신춘환,이재인 한국환경과학회 2000 한국환경과학회지 Vol.9 No.2
This study was carried out to investigate the filtration characteristics of membrane modules according to hollow fiber dispersion for direct solid-liquid separation of activated sludge. 2 bundle, 4 bundle, and 10 bundle module used in this experiment according to hollow fiber dispersion was manufactured at laboratory and permeate flux and transmembrane pressure(TMP) of each module were observed under a suction pressure of 0.5㎏_f/㎠. As the hollow fibers were dispersed, permeate flux was increased and TMP was decreased. Permeate flux and TMP of each module was 15.0 ℓ/㎡·h and 31.8 ㎝Hg for 2 bundle, 16.0 ℓ/㎡·h and 17.4 ㎝Hg for 4 bundle, and 20.4 ℓ/㎡·h and 13.8 ㎝Hg for 10 bundle. In conclusion, the membrane fouling is expected to be decrease by maintaining lower TMP with hollow fiber dispersion.
신춘환,김희숙,허근태 한국환경과학회 1996 한국환경과학회지 Vol.5 No.1
A recycling soap was prepared from non-cooking oils. The effects of physical and chemical properties of the recycling soap on biodegradation are expected to be different due to the thermal histories of the non-cooking oils. Therefore, the biodegradation rate of the recycling soap was studied by using Klebsiella pneumoniae(K. pneumoniae), and the growth rate of K.pneumoniae in soap solution was observed. The biodegradation rate of the recycling soap appeared to be slower as the thermal histories of the non-cooking oils became larger. This might be resulted from hydrolysis, in which the ester bonds in the oils are broken to produce hydroxyl group. It was also observed that the growth rate of the microorganism decreased with the increase in the thermal histories of the oils. As a result, it is desired that recycling soap should be produced from the non-cooking oils with the proper ranges of thermal histories to reduce water contamination. The non-cooking oils with larger thermal histories are considered to be recycling through the cracking process before used.
신춘환,김종현,한선홍 한국환경과학회 1994 한국환경과학회지 Vol.3 No.2
Various antimicrobial agents are widely used for the purpose of antimicrobial process. We investigated anlimicrobial activity and reduction efficiency of mal-ordour by the diphenyl ether compound (2,4,4' - trichloro - 2' - hydroxy diphenyl ether) against Staphylococcus aureus(S.aureus) and Proteus vulgaris(P.vulgaris) causing the mal-ordour. Especially, the diphenyl ether compound is not restricted to the regulation of water-contamination. In this research, we found that the optimum concentration of diphenyl ether compound was 1.5w% for both strains and antimicrobial expressions were c^0.38t = 2.56 for S.aureus, c^0.38t = 2.67 for P.vulgaris. We found also that -OH group played the role of antimicrobial functional group. Lastly, reduction effect of mal-ordour was more than 90% for both strain at the optimum conditions.