A pulsed power supply was used in capacitive deionization instead of DC power supply. A pulsed capacitive deionization cell was constructed. The removal rates of NO3--N and NH3-N by pulsed-CDI and DC-CDI were compared, and within 60 minutes, a higher removal efficiency by pulsed-CDI. The removal rate of NO3-N was the highest under 50% duty cycle and 104Hz frequency. Results from molecular dynamics simulation showed that the orientation of hydrogen and oxygen atoms in water molecules was more random under pulsed electric field. Compared with DC electric field, the orientation polarization of water molecules' dipole moment was weakened and the mass transfer resistance of ions is reduced.
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JIN Zhao-yan, HU Xiao-min, SUN Tong, ZHAO Yan. Capacitive deionization using a pulsed power supply for depth denitrogenation and molecular dynamics simulation. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 2871-2879.
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