Most studies on corona-charged nonwoven filters have used grounded electrodes during charging and surface potential measurements but not during filtration experiments. This study was focused on the investigation of a grounded metal grid effect on the filtration efficiency. The results showed that the filtration outcome strongly depends on the filter–grid distance. Moreover, the electric charge was maintained for a considerably long duration when the ground electrode was used, which led to an increase in the filtration efficiency. The efficiency exceeded 90% at a voltage of 10 kV with the grid and was <70% at 30 kV without the grid.

中文翻译：

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接地金属网附近的无纺布过滤器的静电荷衰减和过滤性能

关于带电晕的非织造过滤器的大多数研究都在充电和表面电势测量过程中使用接地电极，但在过滤实验中并未使用接地电极。这项研究的重点是研究接地金属栅格对过滤效率的影响。结果表明，过滤结果在很大程度上取决于过滤器与格栅的距离。此外，当使用接地电极时，电荷保持相当长的时间，这导致过滤效率的提高。在有电网的情况下，在10 kV的电压下，效率超过90％，在无电网的情况下，在30 kV的效率低于70％。