Mechanism of Calcium Ion Precipitation from Hard Water Using Pulsed Spark Discharges

被引：0
作者：
Yong Yang
Hyoungsup Kim
Andrey Starikovskiy
Young Cho
Alexander Fridman
机构：
[1] Drexel University,Department of Mechanical Engineering and Mechanics
来源：
Plasma Chemistry and Plasma Processing | 2011年 / 31卷
关键词：
Physical water treatment; Pulsed spark discharge; Hard water; Calcium carbonate precipitation;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Direct pulsed spark discharge treatment was found to be able to induce the precipitation of calcium ions in supersaturated hard water (Yang et al. in Water Res 44:3659, 2010). The present study investigated possible pathways for the plasma-induced precipitation. Both UV and reactive species were found not the major factors that stimulate the precipitation in present setup. A transient hot-wire method was used to investigate the effect of plasma-induced local micro-heating. Approximately 15% drop in the calcium-ion concentration was observed, indicating that the local micro-heating effect could be the major contributing factor. Additionally, a nanosecond pulsed corona discharge was used to investigate the non-thermal effect of plasma, and a maximum 7% drop in the calcium hardness was observed. Calcite with rhombohedron morphology was observed in both cases, similar to the structure observed in the spark discharge treatment case, indicating that calcium-ion precipitation process could be attributed to both the thermal and non-thermal effects produced by the plasma.
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页码：51 / 66
页数：15
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