Technology and mechanism of water scale removal by electrochemical method

The scale inhibition and removal processes by electronic water treatment were investigated in this study. The results show that the treatment of scale inhibition with 7.0V can be used first for the water with the hardness over 300 mg·L^-1(CaCO₃), and then the treatment of scale removal with 5.0V can be applied when the water hardness decreases to less than 130 mg·L^-1(CaCO₃). With the present energy-saving approach, more than 90 percent of the scale ions can be removed after treatment and no obvious scale will decompose on the surface of the heat exchanger. The SEM figures depict that the crystal morphology of scale is affected by the electronic water treatment. The crystal morphology of scale with and without the electronic water treatment is calcite and aragonite, respectively.