Abstract
The industrial application of electrochemical water softening technology is constrained by cathode surface area and regeneration issues. In this work, a three-dimensional filled-bed electrode is built by coupling stainless steel mesh with coke. The electrochemical water softening and regeneration performances are extensively investigated. The results demonstrate that coke disperses the electrode potential, enabling more rapid precipitation of calcium carbonate in circulating water where calcium and magnesium ions are present in common. The energy consumption is 8.66 KWh/KgCaCO3 and the precipitation rate is 32.74 g/m2·h at 36 A/m2. Additionally, because the coke surface is not easy to deposit scale layer, it can maintain activity when the outer stainless steel mesh is covered with scale layer. Even if the electrode is deactivated, vibration can swiftly restore it, allowing it to keep up effective water softening performance. After several regenerations, the precipitation rate is still above 30 g/m2·h.
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