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Critical comparison between the pulsed electric field and thermal decontamination methods of hospital waste water

Critical comparison between the pulsed electric field and thermal decontamination methods of hospital waste water
chair:

Gusbeth, C. / Frey, W. / Schwartz, T. / Rieder, A. (2009)

place: Acta Physica Polonica A  (2009), 115, 1092-1094

Date: 2009

Gusbeth, C. / Frey, W. / Schwartz, T. / Rieder, A. (2009): „Critical comparison between the pulsed electric field and thermal decontamination methods of hospital waste water“. In: Acta Physica Polonica A  (2009), 115, 1092-1094 

Abstract

Filtered wastewater samples were inoculated with Enterococcus faecium and exposed to di®erent pulsed electric ¯eld (PEF) treatment energies at 40, 50 and 60±C. A lethal effect of heat treatment on E. faecium can be observed for T > 56±C and a heating duration of 4 min. A treatment with 60±C, 4 min, provokes a bacterial reduction of 4 log. A combined treatment of inoculated wastewater samples with pulsed electric ¯eld and heat (40, 50 and 60±C) reduced the bacterial contamination considerably. At a suspension temperature of 60±C pulsed electric ¯eld inactivation resulted in a complete bacterial decontamination (8 log reduction rate).

Moreover, it was demonstrated that naturally occurring nuclease activities were not changed by the pulsed electric ¯eld treatment. In contrast to a thermal treatment with temperature over 72±C, for 4 min., the nuclease activity was reduced up to 90%. In this case, inactivation is only 4 log. The same inactivation rate can be obtained by a combination of heat treatment (60±C) and pulsed electric ¯eld treatment (30 J/ml).

 

 

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