• Effect of ionic Strength of Electrolyte on Phenanthrene Removal in Electrokinetic-Fenton Process
  • Park Ji-Yeon;Kim Sang-Joon;Lee You-Jin;Yang Ji-Won;
  • Department of Chemical & Biomolecular Engineering, KAIST;Department of Chemical & Biomolecular Engineering, KAIST;Department of Chemical & Biomolecular Engineering, KAIST;Department of Chemical & Biomolecular Engineering, KAIST;
  • 동전기-펜턴 공정에서 phenanthrene 제거에 대한 전해질 이온세기의 영향
  • 박지연;김상준;이유진;양지원;
  • 한국과학기술원 생명화학공학과;한국과학기술원 생명화학공학과;한국과학기술원 생명화학공학과;한국과학기술원 생명화학공학과;
Abstract
Characteristics of phenanthrene removal in an electrokinetic (EK)-Fenton process were investigated in a viewpoint of concentration and ionic strength of electrolytes. When three kinds of electrolytes (NaCl, $KH_2PO_4,\;and\;MgSO_4$) were used, the increase in electrolyte concentration caused the decrease of electrical potential gradient. The increase of electrical conductivity was due to the increase of ionic concentration in soil. The decrease of accumulated electroosmotic flow (EOF) with increase in electrolyte concentration was due to the decrease of zeta potential. The removal efficiency was in proportion to accumulated EOF which depended on ionic strength. Total energy expenditure without electrolyte was 10-30 times higher than its with 0.5 M electrolyte. The lower removal efficiency was caused by the lower energy expenditure with 0.5 M one. An effective EK-Fenton process was determined from considering the removal efficiency and the energy expenditure, simultaneously.

동전기-펜턴 공정에서 전해질의 농도와 이온세기가 공정효율에 미치는 영향을 파악하기 위하여, 세 가지 전해질(NaCl, $KH_2PO_4,\;MgSO_4$)을 대상으로 전기삼투유량의 변화와 phenanthrene의 분해율을 살펴보았다. 전해질의 농도가 증가할 수록 낮은 전압경사를 나타냈는데, 이는 전해질의 농도 증가에 따라 토양 내의 이온 농도가 증가해 전표가 증가하였기 때문이다. 전해질의 농도가 증가할수록 전기삼투유량은 감소하였는데, 이는 전해질의 농도가 증가할수록 제타포텐셜과 확산이중층의 두께가 감소함으로써 전기삼투유량이 감소하였기 때문이다. 전기삼투유량은 전해질의 종류 에 따라 차이가 거의 없었으며, 이온의 세기에 주로 의존하였다 높은 전기삼투유량에서는 과산화수소와 오염물의 잦은 접촉기회에 기인하여 높은 제거율을 나타내었다. 총 전력소비량은 전해질이 첨가되지 않았을 경우가 0.5 M 일 때 보다 약 10-30배 높았다.0.5 M의 경우 낮은 전력소비량을 나타내었지만, 낮은 전기삼투유량에 기인하여 제거율이 낮게 나타났다. 동전기-펜턴 공정의 최적 전해질 농도 결정시 전력소비량과 제거율을 복합적으로 고려하는 것이 바람직하다.

Keywords: Electrokinetic-Fenton process;Electrolyte;Ionic strength;Hydrogen peroxide;

Keywords: 동전기-펜턴 공정;전해질;이온세기;과산화수소;

References
  • 1. 양지원, 박지연, 김상준, 이유진, 기대정, 2004, 동전기-펜턴 공정을 이용한 phenanthrene 오염토양의 정화, J. of KoSSGE, 9(1), 47-53
  •  
  • 2. 이현호, 백기태, 양지원, 1999, 동전기 정화기술을 이용한 kaolinite-white O에서의 납 제거, J. of KSEE, 21(9), 1751-1760
  •  
  • 3. 정하익, 1998, 지반환경공학, 유림, 서울, p. 608-634
  •  
  • 4. Acar, Y.B. and Alshawabkeh, A.N., 1993, Principles of electrokinetic remediation, Environ. Sci. Technol., 27(13), 2638-2647
  •  
  • 5. Acar, Y.B., Gale, R.J., Alshawabkeh, A.N., and Marks, R.E., 1995, Electrokinetic remediation: Basics and technology status, J. of Hazardous Materials, 40, 117-137
  •  
  • 6. Ko, S.O., Schlautman, M.A., and Carraway, E.R., 2000, Cyclodextrin-enhanced electrokinetic removal of phenanthrene from a model clay soil, Environ. Sci. Technol., 34, 1535-1541
  •  
  • 7. Lageman, R, 1993, Electroreclamation, Environ. Sci. Technol., 27(13), 2648-2650
  •  
  • 8. Lee, H.H. and Yang, J. W., 2000, A new methode to control electrolytes pH by circulation system in electrokinetic soil remediation, J. of Hazardous Materials, B77, 227-240
  •  
  • 9. Stoner, G.E. and Cahen, G.L., 1982, The mechanism of low frequency a.c. electrochemical disinfection, Bioelectrochemistry and Bioenergetics, 9, 229-243
  •  
  • 10. Teel, A.L., Warberg, C.R., Atkinson, D.A, and Watts, R.J., 2001, Comparison of mineral and soluble iron Fenton's catalysts for the treatment of trichloroethylene, War. Res., 35(4), 977-984
  •  
  • 11. Watts, R.J. and Dilly, S.E., 1996, Evaluation of iron catalysts for the Fenton-like remediation of diesel-contaminated soils, J. of Hazardous Materials, 51, 209-224
  •  
  • 12. Yang, G.C.C. and Liu, C.Y., 2001, Remediation of TCE contaminated soils by in-situ EK-Fenton process, J. of Hazardous Materials, B85, 317-331
  •  
  • 13. Yang, G.C.C. and Long, Y.W., 1999, Removal and degradation of phenol in a saturated flow by in-situ electrokinetic remediation and Fenton-like process, J. of Hazardous Materials, B69, 259-271
  •  

This Article

  • 2005; 10(4): 18-25

    Published on Aug 1, 2005