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복합적 오염토양으로부터 Polycyclic Aromatic Hydrocarbon ( PAH ) 의 용출에 관한 연구
염익태,안규홍 ( Ick Tae Yeom,Kyu Hong Ahn ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.3
Dissolution of PAHs from a mixture of soil and multi-components coal tar was studied in batch experiments. Equilibrium aspects of the release of individual components into water were evaluated by washing the soil/tar mixture with deionized water. Solubilities of PAHs in the mixture were much less than their intrinsic aqueous solubilities. Only a small fraction ($lt;0.1%) of soil-bound PAHs could be dissolved when 100g soil was washed with 1L water. Equilibrium partitioning of PAHs between soil/tar and water could be described by Raoult`s law assuming the tar residues in the soil behave ideally. To investigate kinetic aspects of PAH release from the soil/tar, Tenax - TA, a polymeric adsorbent was used. Tenax adsorb aqueous PAHs completely from solution and thus maximize their mass transfer at the soil/tar - water interface. With Tenax in water, most constituent PAHs failed to attain equilibrium, indicating the release of PAHs from soil/tar mixture is a slow, rate-limiting process. To elucidate the rate- limiting process, both interfacial mass transfer(film diffusion) and matrix diffusion models were tested to fit the observed data. Model analysis revealed the diffusion of PAH through the organic matrix of soil/tar is most likely the process responsible for the slow release of PAHs.
산란광을 이용한 수질모니터링 기법에 관한 연구 - 질소산화물과 Chlorophyll-a
김종석 ( Jong Seok Kim ),염익태 ( Ick Tae Yeom ),조성우 ( Sung Woo Jo ),이석헌 ( Seock Heon Lee ),안규홍 ( Kyu Hong Ahn ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.6
The main finding of this research was the fluorescence and light scattering properties of water, their relationship with corresponding NOx(NO_2+NO_3). Chlorophyll-a values and the correction for interference matter. The samples obtained from surface and domestic water. In experimental conditions, spectrum of NOx(NO_2+NO_3) detected at excitation/emission wavelength 220/220nm and Chlorophyll-a detected at 430/677nm. All spectrum were performed using in scan mode, scan speed 300nm/min, excited/detected spectrum band width 5nm, and xenon lamp(20kW) as light source. The correlation between NOx(NO_2+NO_3) and light scattering intensity values, and the Chlorophyll-a were high. Especially the NOx(NO_2+NO_3), the calculated values by multiple regression using predictor variables highly correlated to the observed values. The result investigates the possibility of using a scattering technique for application of rapidly real-time and on-line monitoring of NOx(NO_2+NO_3) and Chlorophyll-a values.
권재현,류성호,박기영,안규홍,염익태,이용훈 대한상하수도학회 2002 상하수도학회지 Vol.16 No.2
The effects of ozone treatment on the dewaterability of activated sludge wasted from a sewage treatment plant were investigated in this study. Following ozone treatment, sludge was dewatered using a pressure fitter. The sludge filterability evaluated by SRF deteriorated with ozone dosage at relatively low ozone doses due to sludge solubilization and particle size decrease. However, at ozone doses higher than 0.6gO_3/gSS, the SRF of the ozone treated sludge became comparable with the value for the sludge without ozone treatment. It is suggested that the oxidation of the viscous, high molecule organics attached at cell surface reduces the surface charge of sludge particle and promotes flocculation at relatively high ozone doses. Ozone treatment also cause the release of bound water trapped inside cells or flocs, resulting in significant reduction of cake water content after dewatering. In terms of cake volume, more than 70% reduction was obtained at 0.6gO_3/gSS. These observations suggest that ozone treatment has potential to significantly enhance sludge dewaterability and to produce a more compact cake without severe deterioration of its filterability.