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FIBER OPTIC SENSOR FOR IN-SITU AND REALTIME MONITORING OF TRANSPORT OF GAS PHASE OZONE IN UNSATURATED POROUS MEDIA

Environmental engineering research, v.10 no.2, 2005년, pp.71 - 78  

Jung, Hae-Ryong ,  Park, Hee-Chul

Abstract AI-Helper 아이콘AI-Helper

A series of column experiments was conducted to develop a monitoring system for in-situ and realtime measurement of ozone transport in unsaturated porous media using a fiber optic sensor. The calibration of the fiber optic transflection dip probe (FOTDP) system was successfully carried out at variou...

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제안 방법

  • Changes in the light intensity were measured to evaluate the ability of the FOTDP system measurement when ozone was applied into the column packed with the glass beads in two di施rent injection modes, a p네se injection and a step injection. Glass beads washed with HC1 (1 M) solution were found to exert no significant ozone demand.
  • Ghordrati et aL (2000) reported that they measured the resident concentration of solute in homogeneously paced columns using fiber optic probes. However, the FOTDP system designed in this paper measured the flux-averaged concentration of gaseous ozone due to the unique property of dip probe: the tip contained a slit of path, and gaseous ozone passed through the slit was monitored.
  • The fiber optic transflection dip probe (FOTDP) system developed in this study is based on the transmission of ultra violet (UV) light through the input leg of a bifurcated fiber optic bundle to the end of a dip probe. UV light was selected since it can be absorbed by gaseous ozone in the short-UV wavelength range.
  • 2. The system consisted of an ozone generator (GL-1, PCI-100; NJ, USA), a mass flow controller (F201C-FAC-22-V, BronkPiorst Hi Tec; Netherlands), a gas-washing bottle and an UV/ VIS spectrophotometer (Smart Plus 1900, Yo니ngwoo Instrument Corp.; Korea). The gaseous ozone was moisturized by passing it through the gas-washing bottle containing deionized water acidified to pH 2, and then injected into a UV/VIS spectrophotometer eq니ipped with a flow cell for continuous monitoring of the concentration.
  • Tn this study, laboratory scale experiments were conducted to develop a sensor system using a fiber optic transflection dip probe (FOTDP) for in-situ monitoring of gaseous ozone simultaneously at multi-points within soil columns packed with variably saturated porous media.
  • Accurate measurements of ozone concentrations at various flow rates are important in applying the FOTDP system for in-situ monitoring. To investigate the applicability and accuracy of the FOTDP system at various flow rates, the BTCs of the gaseous ozone were measured at three different flow rates of 200, 300 and 500 mL/min. Pore volumes required to reach C/Cn=Q.

대상 데이터

  • The flow rate of the gaseous ozone was controlled using a mass flow controller. For all experiments, gaseous ozone was measured using a wavelength of 259 nm, and the results were recorded by a PC-based data acquisition system. Once ozone concentration stabilized, gaseo 나 s ozone was passed through the columns from bottom to top.
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참고문헌 (20)

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  2. Miller, C. M., Valentine, R. L., Roehl, M. E. and Alvarez, P. J. J., 'Chemical and microbiological assessment of pendimethalincontaminated soil after treatment with Fenton's reagent,' Water Res., 30, 2579- 2586 (1996) 

  3. Hsu, I. and Masten, S. J., 'The kinetics of the reaction of ozone with phenanthrene in unsaturated soils,' Environ. Eng. Science, 14, 207-217 (1997) 

  4. Masten, S. J. and Davies, S. H. R., 'Efficacy of in-situ ozonation for the remediation of PAH-contaminated soils,' J. Contam. Hydrol., 28, 327-335 (1997) 

  5. Nam, K. and Kukor, J. J., 'Combined ozonation and biodegradation for remediation of mixtures of polycyclic aromatic hydrocarbons in soil,' Biodegradation, 11, 1-9 (2000 

  6. Choi, H., Lim, H. N., Kim, J. Y. and Cho, J., 'Oxidation of polycyclic aromatic hydrocarbons by ozone in the presence of sand,' Water Sci. Technol., 43, 349-356 (2001) 

  7. Choi, H., Lim, H. N., Kim, J., Hwang, T. M. and Kang, J. W., 'Transport characteristics of gas phase ozone in unsaturated porous media for in-situ chemical oxidation,' J. Contain Hydrol., 57, 81-98 (2002) 

  8. Kim, J. and Choi, H., 'Modeling in situ ozonation for the remediation of nonvolatile PAH-contaminated soils,' J. Contam. Hydrol., 55, 261-185 (2002) 

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  12. Hsu, J. and Masten, S. J., 'Mathematical modeling and column studies of gaseous ozone in unsaturated soil,' J. Environ. Eng., 127, 546-554 (2001) 

  13. Jung, H., Kim, J. and Choi, H., 'Reaction kinetics of ozone in variably saturated porous media,' J. Environ. Eng., 130, 432-441 (2004) 

  14. Lee, B., 'Review of the present status of optical fiber sensors,' Optical fiber technology, 9, 57-79 (2003) 

  15. Chudyk, W. A., Carraba, M. C; and Kenny, J. E., 'Remote detection of groundwater contaminants using far-ultraviolet laser induced fluorescene,' Anal. Chem., 57, 1237-1242 (1985) 

  16. Reichert, J., Sellien, W. and Ache, H. J., 'Development of a fiber-optic sensor for the detection of ammonium in environmental waters,' Sens. Actuators, A, 25, 481-482 (1991) 

  17. Dybko, A., Maciejewski, J., Brzozka, Z., Wroblewski, W. and Romaniuk, R. S., 'Application of optical fibres in oxidationreduction titrations,' Sens. Actuators, E, 29, 374-377 (1995) 

  18. Ghodrati, M., 'Point measurement of solute transport processes in soil using fiber optic sensors,' Soil Sci. Soc. Am. J., 63, 471-479 (1999) 

  19. Ghodrati, M., Garrido, F., Campbell, C. G. and Chendorain, M., 'A multiplexed fiber optic miniprobe system for measuring solute transport in soil,' J. Environ. Qual., 29, 540-550 (2000) 

  20. Ge, Z., Brown, C. W. and Albert, J. J., 'Infrared fiber optic sensor for petroleum,' Environ. Sci. Technol., 29, 878-882 (1995) 

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