High voltage impulse(HVI) has been gained attention as an alternate technique controlling CaCO3 scale formation. Investigation of key operational parameters for HVI is important, however, those had not been reported yet. In this study, the effect of temperature and applied voltage of HVI on Ca2+ concentration was studied. As the applied voltage from 0 to 15kV and the temperature increased from 20 to 60°C, the Ca2+ concentration decreased, indicating that the aqueous Ca2+ precipitated to CaCO3. The Ca2+ concentration decreased up to 81% under the condition of 15kV and 60°C. Rate constant for the precipitation reaction, k was determined under different temper1ature and voltage. The reaction rate constant under the 15kV and 60°C condition was evaluated to 66☓10-3 L/(mmol·hr), which was 5 times greater than the k of the reaction without HVI at same temperature. The increases in k by HVI at higher temperature region(40 to 60°C) was much greater than at lower temperature region(20 to 40°C), which implies temperature is more important parameter than voltage for reducing Ca2+ concentration at high temperature region. These results show that the HVI induction accelerates the precipitation to CaCO3, particularly much faster at higher temperature.

ABSTRACT
 1. 서 론
 2. 실험 장치 및 방법
  2.1 HVI 시스템
  2.2 HVI 반응기
  2.3 시료 및 분석
  2.4 전극코팅
 3. 결과 및 고찰
  3.1 HVI 인가전압 및 온도에 따른 Ca2+ 농도 변화
  3.2 반응 차수 및 반응속도 상수 (k) 분석
 4. 결 론
 References

• 김재현(호서대학교 안전환경기술융합학과) | Jae-Hyun Kim (Department of Convergence Technology for Safety and Environment, Hoseo University)
• 장인성(호서대학교 환경공학과) | In-Soung Chang (Department of Environmental Engineering, Hoseo University) Corresponding author