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중공유리구에 고정화된 TiO_2 광촉매를 이용한 수중 조류(藻類)의 광합성억제
강민수,정익상,조인철,김성우,이동근 경상대학교 환경보전연구소 2000 環境保全硏究所報 Vol.8 No.-
TiO_2 was coated on the surface of the hollow pyrex glass beads through a sol-gel method. The TiO_2-coated hollow glass bead was employed as a photocatalyst to inactivate the algae under the illumination of UV light. TiO_2 could successfully be immobilized as a film on the surface of the glass bead. The TiO_2 film had anatase form and the average thickness of the film was estimated to be 0.3㎛. Two species of algae. Anabaena, and Microcystis were taken for the inactivation experiments. They are commonly found in algal blooms in eutrophic waters. When irradiated by UV light in the presence of the TiO_2-coated glass beads. Anabaena cells and Microcystis cells were lost their photosynthetic activity. Complete photocatalytic inactivation of Anabaena and Microcystis was obtained in about 30min.
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중공유리구에 고정화된 광촉매를 이용한 남조류의 증식억제
강민수,정익상,우승희,김성우,이동근 경상대학교 환경보전연구소 2001 環境保全硏究所報 Vol.9 No.-
Photocatalytic inactivation of Microcystisaeruginosa was carried out with the TiO₂-coated pyrex hollow glass beads under the illumination of UV light(370㎚ wavelength). After being irradiated with UV light in the presence of the TiO₂-coated pyrex glass beads, Microcystis aeruginosa, known as typical cyanobacteria, lost their photosynthetic activity, and the colonies of Microcystis cells were completely separated into individual spherical one. Complete photocatalytic inactivation of Microcystis aeruginosa was obtained in about 30min. Photosynthesis activity of the cyanobacteria could be inhibited effectively after being reacted photocatalytically with TiO₂ immobilized hollow glass ball.
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이지영,김세준,정익상,조경제 대한상하수도학회 2010 상하수도학회지 Vol.24 No.6
Bacterial biomass and its activity were measured in two kinds of granular activated carbon (GAC), the experimental and existing biofiltration system in a drinking water plant. The bacterial biomass was around 210 to 250 nmol P/g WW with phospholipid concentration at acclimation of ozonation treatment. The phospholipid biomass shows more or less a declining gradient along filter depth and no clear seasonality in its values. On the other hand, the microbial activity of [3H]-thymidine and [14C]-acetate incorporation within cells increased significantly along the filter depth, showing the difference of three fold between the upper and bottom layer. These factors support the different microbial composition or metabolic activity along the depth of GAC column. Turnover rates, the rate of bacterial biomass and production of biofilm, ranged from 0.26 /hr to 0.37 /hr, indicating a highly rapid recovery itself at amature state. In the non-ozonation treatment, the bacterial biomass was lower than in the ozonation and biological activity also declined towards the filter depth. The biomass levels during cessation of ozonation in the existing GAC filters were 68% of the actively ozonated state.
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