Bacterial decontamination of water by means of pulsed-corona discharges
Bacterial decontamination of water by means of pulsed-corona discharges
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DOI：
10.1109/tps.2002.804193
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发表时间：
2002-08-01
影响因子：
1.5
通讯作者：
Moreira, KR
中科院分区：
文献类型：
--
作者：
Abou-Ghazala, A;Katsuki, S;Moreira, KR
用直径75微米、距平面阴极2 cm的钨丝，施加600 ns、120千伏的方波脉冲，获得了脉冲水电晕放电。用被大肠杆菌或枯草芽孢杆菌污染的水研究了这些排放物对细菌的影响，后者在营养状态和孢子状态下都是如此。对大肠杆菌的抑制作用最强。在向水中施加8次电晕放电后，大肠杆菌的浓度可以减少三个数量级。相应的能量消耗为10J/cm(3)。除污率在开始时最大，15次放电后明显下降，达到初始浓度的10(-4)。对于营养状态的枯草杆菌，几乎需要30次放电才能达到同样的结果，相当于40J/cm(3)的能量消耗。对枯草杆菌孢子无影响。与脉冲电场(PEF)法的比较表明，PWC法的去污效率略高于脉冲电场(PEF)法。
By using a tungsten wire with 75-mum diameter, 2 cm apart from a plane cathode, and applying a 600-ns, 120-kV square wave pulse, we were able to obtain a pulsed-water corona discharge (PWC). The effect of these discharges on bacteria was studied using water contaminated with Escherichia coli or Bacillus subtilis, the latter in both the vegetative and spore state. The strongest effect was obtained on E. coli. The concentration of E. coli could be reduced by three orders of magnitude after applying eight corona discharges to the water. The corresponding energy expenditure is 10 J/cm(3). The decontamination rate had the largest values at the beginning, and decreased considerably after 15 electrical discharges, reaching a constant residual concentration value of 10(-4) of the initial concentration. For B. subtilis in the vegetative state, it took almost 30 discharges to reach the same result, corresponding to an energy expenditure of 40 J/cm(3). There was no effect on B. subtilis spores. Comparisons with the pulsed-electric field (PEF) method indicate that the decontamination efficiency of the PWC method is slightly higher than that of the PEF method.