WAKTU PAPARAN GAS OZON TERHADAP PERTUMBUHAN BAKTERI Escherichia coli

Abstract

Ozone is one of the gases that can be used as a disinfectant to inhibit the growth of
Escherichia coli bacteria. Time of exposure to ozone gas is a way used to disinfect
Escherichia coli bacteria. The purpose of this study was to observe the number of
Escherichia coli bacteria exposed to ozone gas with exposure time of 5, 10, 15, 20, 25
and 30 minutes and ozone gas control. The study sample was Escherichia coli
bacteria exposed to ozone gas. The results of the number of colonies of Escherichia
coli on CCA media after exposure to 5, 10, 15 minutes of ozone gas were mean 2.5 x
106, 1.25 x 106, 0.5 x 106 CFU / ml, and 20, 25, 30 minutes there is no bacterial
growth. Control or no exposure to ozone gas mean is 9 x106 CFU / ml. The time of
exposure to ozone gas is most effective in killing Escherichia coli bacteria ie at 20
minutes.

Keywords: ozone gas, Escherichia coli, Exposure time.