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Degradation of Hazardous Chemicals by Biological Activated Carbon Treatment
Okada,Mitsumasa 嶺南大學校 環境問題硏究所 1993 環境硏究 Vol.12 No.2
Biodegradation of hazardous organic chemicals in organic wastewater by attached bacteria on biological activated carbon (BAC) with adsorbability were evaluated in comparison with fine particles of support medium (granulated slug (GS), bentonite(BEN)) and conventional activated sludge process (AS) to elucidate the role of activated carbon on the improvement of the performance of biological/physical removal of hazardous chemicals from wastewater. Activated carbon did not improve the performance under steady state operation. Better performance was noted in BAC system under shock loading, increase in the concentration of phenolic waste, of hazardous wastewater than in AS and GS systems. This seemed to be referable to the stimulation of bacterial activity to decompose phenol by activated carbon and to the remaining capacity of adsorption to decrease extracellular concentration of phenol. m-aminobenzoic acid added into the phenolic wastewater was decomposed only in the system added with powdered activated into activated sludge. Biodegradation was unstable both in AS and BEN systems. Although bacterial activity to degrade m-aminobenzoic acid was enhanced in the BAC system, remarkable increase in viable count on the medium with m-aminobenzoic acid as a sole carbon source was not noted. Also, species composition seemed to be identical among BAC, BEN and AS systems. It seemed likely that activated carbon, in addition to the capacity of adsorption, stimulated indigenous bacterial activity without enhancing species succession or population growth to show better performance for biodegradation.
수질지표로서의 대장균군과 Coprostanol 과의 비교시험연구
김정현,영목기지,강전광정 한국물환경학회 1986 한국물환경학회지 Vol.2 No.1
本 硏究에 貴重한 助言을 해주신 延世大學校 權肅杓敎授와 慶熙大學校 崔範錫敎授에게 感謝를 表하며, 慶熙大學院 및 學部學生들의 手苦에 感謝합니다. 本 論文은 韓國學術振興財團 '85尖端科學 技術分野 硏究支援에 의한 硏究結果입니다. To assess the fecal contamination, the coprostanol was measured by GC-MS in Chung Ryang stream from November 3, 1985 to May 25, 1986, which was much polluted by municipal sewage and night soil from the crowd residential area, a part of Seoul, along the stream. That was compared with the coliform group and was analyzed statistically. The result was obtain as follows ; The coprostanols were determined at 0.6-1.5 ng/1 in the range of concentrations. The concentrations were not significantly different from the up-stream to the down-stream. The numbers of coliform groups were gradually increased as lower the streams. It was shown in no relationships between the coprostanol and tee number of coliform groups in the stream(r = 0.18). With the above results, it is discussed that the coprostanol is not reliable in the determination of fecal contamination as an index of water qualities.
FATE OF TRICRESYL PHOSPHATE ISOMERS IN KUROSE RIVER(JAPAN)
INOUE,Yujirou,TAKIMOTO,Kazuto,OKADA,Mitsumasa,CHO,Kyung Jin 嶺南大學校 環境問題硏究所 1994 環境硏究 Vol.14 No.1
Origin and fate of TCP isomers were studied in Kurose River, Hiroshima, Japan. As main factors to control the fate, the adsorption characteristics of TCP isomers onto sediment and biodegradation in river water and sediment were studied. Concentration of TCP isomers in river water, sediment and SS were the highest in autumn. It was about ten times as large as that in winter. High concentration of o-TCP was noted except for spring. Different from other seasons, the concentrations of o-TCP was relatively low and m-TCP was not detected in summer. These variation seemed to be due to the difference in the rate of biodegradation with temperature. The concentrations of TCP isomers increased with the increase in flow rate under flooding condition. TCP in the river originated from non-point sources and not from wastewaters nor equilibrium was observed between bottom sediment and river water indicating TCP was biodegraded rapidly in the bottom sediment. The biodegradation rate in the sediment was the lowest for o-TCP and the highest for p-TCP. The biodegradation rate of m-TCP was small under low temperature, whereas it was large in high temperature above 20℃. The most biodegradable isomer, p-TCP, was not detected in most cases.
Morioka,Takayuki,Motoyama,Nobuyuki,Hoshikawa,Hiroshi,Okada,Mitsumasa,Moniwa,Takeo 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.15 No.1
Reactions between radicals and dissolved substances, e.g., phosphate buffer, carbonate ions and trace organics were included in the SBH (staehelin, Buhler, Hoigne) aqueous ozone decomposition model. Ozone decomposition rate obtained in laboratory studies and the calculated rate by this extended SBH model agreed satisfactorily. Odorous compound and humic substances were also included in the extended SBH model. Numerical analysis on the decomposition rate of the odorous compound was in good agreement with the results of laboratory studies, i.e. the decomposition rate initially increased with increase in the concentration of humic substances; reached maximum; and then decreased with further increase in the concentration of humic substances. And the role of humic substances on the decomposition of the odorous compound by ozone was elucidated by the model.