High voltage impulse (HVI) has been gained attention as an alternative technique that could control the CaCO3 scale problems encountered in water main, pipe, cooling tower and heat exchanger vessels. The aim of this study was to investigate the effect of electric field (E) and contact time (t) of HVI on reduction of Ca2+ concentration at two different temperatures of 25℃ and 60℃. A kinetic model on the effect of E and t was investigated too. As the E and t increased, the Ca2+ concentration decreased more than that of the control (= no HVI). The Ca2+ concentration decreased up to 81% at 15 kV/cm at 60℃, which was nearly 2 times greater than the control. With these experimental data-set of reduction of Ca2+ concentration under different E and t, the kinetic model was developed. The relationship between E and t required to reduce the concentration of Ca2+ by 30% was modeled at each temperature. The empirical model equations were; E0.83· t = 60.3 at 25℃ and E0.08· t = 1.1 at 60℃. These equations state the products of En and t is always constant, which means that the required contact time can be reduced in accordance with the increment of E and vice versa.

1. 서 론
2. 재료 및 실험 방법
    2.1 HVI 시스템
    2.2 HVI 인가 조건
    2.3 시료 조제와 Ca2+ 이온 농도 분석
    2.4 HVI에 의한 Ca2+ 농도 감소의 속도론 해석
3. 결과 및 고찰
    3.1 HVI 시스템 발생 펄스의 관찰
    3.2 HVI에 의한 Ca2+ 농도의 저감
    3.3 HVI 운전 인자가 칼슘농도 감소속도에 미치는 영향의 모델링
5. 결 론
사 사
References

• 김담하(호서대학교 환경공학과) | Dam-Ha Kim (Department of Environmental Engineering, Hoseo University)
• 장인성(호서대학교 환경공학과) | In-Soung Chang (Department of Environmental Engineering, Hoseo University) Corresponding author